SubtypeGroupLayer | API Reference | ArcGIS Maps SDK for JavaScript 4.31

Overview

The SubtypeGroupLayer is a single layer that automatically creates a SubtypeSublayer for each subtype in its corresponding feature service. This allows for each subtype to have its own configured layer properties, and as a result, each sublayer can visualize its feature data with a distinct visibility, renderer, and popup properties. This allows for interaction of the sublayers as if they were individual layers, when in reality, they all share the same feature source.

The SubtypeGroupLayer takes advantage of the fact that all of its sublayers share a single feature service in order to draw more efficiently, and optimize its queries across all sublayers. For instance, a single request is sent when panning or zooming in the Map, keeping in mind that each sublayer can have its own renderer. This approach eliminates the need to require multiple feature layers to be published. This would result in each feature layer sending its own request when panning and zooming the map.

The SubtypeGroupLayer will be useful for data, such as the utility network datasets, which currently contain feature layers with numerous subtypes.

Creating a SubtypeGroupLayer

A SubtypeGroupLayer can be created from a service URL, or an ArcGIS portal item id.

Note

The feature service must be published with subtypes to use the SubtypeGroupLayer. To learn more about publishing a feature service with subtypes and how to create a subtype group layer using ArcGIS Pro, please read the following documentation:

Reference a service URL

To create a SubtypeGroupLayer instance from a service, you must set the url property to the REST endpoint of a layer in a feature service. The feature service must have a subtype field, otherwise the layer will fail to load.

require(["esri/layers/SubtypeGroupLayer"], (SubtypeGroupLayer) => {
  const stgl = new SubtypeGroupLayer({
    url: "https://sampleserver7.arcgisonline.com/server/rest/services/UtilityNetwork/NapervilleElectric/FeatureServer/0"
  });
  map.add(stgl);  // adds the layer to the map
});

Reference an ArcGIS portal Item ID

You can also create a SubtypeGroupLayer from its portalItem property if it exists as an item in ArcGIS Online or ArcGIS Enterprise.

const stgl = new SubtypeGroupLayer({
  portalItem: {  // autocasts as esri/portal/PortalItem
    id: "8444e275037549c1acab02d2626daae"
  }
});
map.add(stgl);

Sublayers

The sublayers of the SubtypeGroupLayer are known as SubtypeSublayers. These sublayers do not correspond to individual services, but rather are created dynamically by the SubtypeGroupLayer. Each sublayer corresponds to a subtype in the SubtypeGroupLayer feature service. One can configure each layer's properties including the renderer and popup. The sublayers' layer properties can be defined via the sublayers property. The following demonstrates an example of configuring the layer properties of the sublayers.

const stgl = new SubtypeGroupLayer({
  url: "https://sampleserver7.arcgisonline.com/server/rest/services/UtilityNetwork/NapervilleElectric/FeatureServer/0",
  sublayers: [ // autocasts as a Collection of SubtypeSublayers
    {
      subtypeCode: 12,
      visible: true,
      renderer: simpleRenderer
    },
    {
      subtypeCode: 14,
      visible: false,
      renderer: classBreaksRenderer
    },
    {
      subtypeCode: 16,
      visible: true,
      renderer: classBreaksRenderer,
      popupTemplate: popupTemplate
    }
  ]
});
map.add(stgl);

Data Visualization

Features in a SubtypeGroupLayer are visualized by setting a Renderer to the renderer property of each sublayer. Features may be visualized with the same symbol using SimpleRenderer, by type with UniqueValueRenderer, or with class breaks using ClassBreaksRenderer.

Known Limitations

SubtypeGroupLayer is only supported in 2D MapViews.
Clustering is currently not supported.
Visual variables are currently not supported.
DotDensityRenderer is currently not supported.
The Legend widget does not support the SubtypeGroupLayer.
Editing via applyEdits() is possible, however, the SubtypeGroupLayer is not currently supported with the Editor widget.

See also

Constructors

SubtypeGroupLayer Constructor new SubtypeGroupLayer(properties)

Parameter

properties Object

optional

See the properties for a list of all the properties that may be passed into the constructor.

Property Overview

Any properties can be set, retrieved or listened to. See the Watch for changes topic.

Show inherited properties

Hide inherited properties

Type	Summary	Class
String	Blend modes are used to blend layers together to create an interesting effect in a layer, or even to produce what seems like a new layer.	SubtypeGroupLayer
Capabilities\|null\|undefined	Describes the layer's supported capabilities.	SubtypeGroupLayer
String\|null\|undefined	Copyright information for the layer.	SubtypeGroupLayer
Object\|null\|undefined	A list of custom parameters appended to the URL of all resources fetched by the layer.	SubtypeGroupLayer
String\|null\|undefined	The time zone that dates are stored in.	SubtypeGroupLayer
Boolean	This property is set by the service publisher and indicates that dates should be considered without the local timezone.	SubtypeGroupLayer
String	The name of the class.	Accessor
String\|null\|undefined	The SQL where clause used to filter features on the client.	SubtypeGroupLayer
String\|null\|undefined	The name of the layer's primary display field.	SubtypeGroupLayer
EditFieldsInfo	The editor tracking fields, which record who adds or edits the data through the feature service and when edits are made.	SubtypeGroupLayer
Boolean	Determines if the layer is editable.	SubtypeGroupLayer
EditingInfo	Specifies information about editing.	SubtypeGroupLayer
Effect\|null\|undefined	Effect provides various filter functions that can be performed on the layer to achieve different visual effects similar to how image filters work.	SubtypeGroupLayer
Capabilities\|null\|undefined	Describes effective capabilities of the layer taking in to consideration privileges of the currently signed-in user.	SubtypeGroupLayer
Boolean	Indicates whether the layer is editable taking in to consideration privileges of the currently signed-in user.	SubtypeGroupLayer
Object	Specifies how features are placed on the vertical axis (z).	SubtypeGroupLayer
Field []	An array of fields in the layer.	SubtypeGroupLayer
FieldsIndex\|null\|undefined	A convenient property that can be used to make case-insensitive lookups for a field by name.	SubtypeGroupLayer
LayerFloorInfo	When a feature layer is configured as floor-aware, it has a floorInfo property defined.	SubtypeGroupLayer
Extent\|null\|undefined	The full extent of the layer.	Layer
String	The version of the geodatabase of the feature service data.	SubtypeGroupLayer
GeometryFieldsInfo\|null\|undefined	Provides information on the system maintained area and length fields along with their respective units.	SubtypeGroupLayer
String\|null\|undefined	The geometry type of features in the layer.	SubtypeGroupLayer
Boolean	Indicates whether the client-side features in the layer have `M` (measurement) values.	SubtypeGroupLayer
Boolean	Indicates whether the client-side features in the layer have `Z` (elevation) values.	SubtypeGroupLayer
Date	The historic moment to query.	SubtypeGroupLayer
String	The unique ID assigned to the layer.	Layer
Boolean	Returns `true` if the layer is loaded from a non-spatial table in a service.	SubtypeGroupLayer
Number\|null\|undefined	The layer ID, or layer index, of a Feature Service layer.	SubtypeGroupLayer
String	Indicates how the layer should display in the LayerList widget.	Layer
Error	The Error object returned if an error occurred while loading.	Layer
String	Represents the status of a load operation.	Layer
Object []	A list of warnings which occurred while loading.	Layer
Boolean	Indicates whether the layer's resources have loaded.	Layer
Number	The maximum scale (most zoomed in) at which the layer is visible in the view.	SubtypeGroupLayer
Number	The minimum scale (most zoomed out) at which the layer is visible in the view.	SubtypeGroupLayer
String	The name of an `oid`field containing a unique value or identifier for each feature in the layer.	SubtypeGroupLayer
Number	The opacity of the layer.	Layer
String []	An array of field names from the service to include with each feature.	SubtypeGroupLayer
Map\|Basemap\|Ground\|GroupLayer\|CatalogDynamicGroupLayer\|CatalogLayer	The parent to which the layer belongs.	Layer
Boolean	Enable persistence of the layer in a WebMap or WebScene.	SubtypeGroupLayer
PortalItem\|null\|undefined	The portal item from which the layer is loaded.	SubtypeGroupLayer
String\|null\|undefined	The IANA time zone the author of the service intended data from date fields to be viewed in.	SubtypeGroupLayer
Number	Refresh interval of the layer in minutes.	SubtypeGroupLayer
Relationship []	Array of relationships set up for the layer.	SubtypeGroupLayer
Boolean	When `true`, indicates that M values will be returned.	SubtypeGroupLayer
Boolean	When `true`, indicates that z-values will always be returned.	SubtypeGroupLayer
String\|null\|undefined	The service definition expression limits the features available for display and query.	SubtypeGroupLayer
Object\|null\|undefined	The feature service's metadata JSON exposed by the ArcGIS REST API.	SubtypeGroupLayer
SpatialReference	The spatial reference of the layer.	SubtypeGroupLayer
Collection<SubtypeSublayer>	A Collection of SubtypeSublayer objects that allow you to alter the properties of one or more sublayers of the SubtypeGroupLayer.	SubtypeGroupLayer
String\|null\|undefined	The name of the field which holds the id of the subtypes.	SubtypeGroupLayer
Subtype []\|null\|undefined	An array of subtypes defined in the layer.	SubtypeGroupLayer
TimeExtent\|null\|undefined	The layer's time extent.	SubtypeGroupLayer
TimeInfo\|null\|undefined	TimeInfo provides information such as date fields that store start and end time for each feature and the fullTimeExtent for the layer.	SubtypeGroupLayer
TimeInterval\|null\|undefined	A temporary offset of the time data based on a certain TimeInterval.	SubtypeGroupLayer
String\|null\|undefined	The title of the layer used to identify it in places such as the Legend and LayerList widgets.	SubtypeGroupLayer
String	For SubtypeGroupLayer the type is always "subtype-group".	SubtypeGroupLayer
String	The absolute URL of the REST endpoint of the layer, non-spatial table or service.	SubtypeGroupLayer
Boolean	Determines if the time enabled layer will update its temporal data based on the view's timeExtent.	SubtypeGroupLayer
Number\|null\|undefined	The version of ArcGIS Server in which the layer is published.	SubtypeGroupLayer
TimeExtent\|null\|undefined	Specifies a fixed time extent during which a layer should be visible.	Layer
Boolean	Indicates if the layer is visible in the View.	Layer

Property Details

blendMode Property blendMode String

Blend modes are used to blend layers together to create an interesting effect in a layer, or even to produce what seems like a new layer. Unlike the method of using transparency which can result in a washed-out top layer, blend modes can create a variety of very vibrant and intriguing results by blending a layer with the layer(s) below it.

When blending layers, a top layer is a layer that has a blend mode applied. All layers underneath the top layer are background layers. The default blending mode is normal where the top layer is simply displayed over the background layer. While this default behavior is perfectly acceptable, the use of blend modes on layers open up a world of endless possibilities to generate creative maps.

The layers in a GroupLayer are blended together in isolation from the rest of the map.

In the following screenshots, the vintage shaded relief layer is displayed over a firefly world imagery layer. The color blend mode is applied to the vintage shaded relief and the result looks like a new layer.

Known Limitations

The blendMode in 3D SceneViews is supported on BaseTileLayer, ImageryTileLayer, OpenStreetMapLayer, TileLayer, VectorTileLayer, WCSLayer, WebTileLayer, WMTSLayer and GroupLayer.
The blendMode is not supported in the Legend.
See print for known printing limitations.

The following factors will affect the blend result:

Order of all layers
Layer opacity
Opacity of features in layers
Visibility of layers
By default, the very bottom layer in a map is drawn on a transparent background. You can change the MapView's background color.

Blend mode	Description
normal	The top layer is displayed over the background layer. The data of the top layer block the data of background layer where they overlap.
average	Takes the mathematical average of top and background layers. Result of `average` blend mode is often similar to the effect of setting the layer's opacity to 50%.

Lighten blend modes:

The following blend modes create lighter results than all layers. In lighten blend modes, pure black colors in the top layer become transparent allowing the background layer to show through. White in the top layer will stay unchanged. Any color that is lighter than pure black is going to lighten colors in the top layer to varying degrees all way to pure white.

Lighten blend modes can be useful when lightening dark colors of the top layer or removing black colors from the result. The plus, lighten and screen modes can be used to brighten layers that have faded or dark colors on a dark background.

Blend mode	Description
lighten	Compares top and background layers and retains the lighter color. Colors in the top layer become transparent if they are darker than the overlapping colors in the background layer allowing the background layer to show through completely. Can be thought of as the opposite of `darken` blend mode.
lighter	Colors in top and background layers are multiplied by their alphas (layer opacity and layer's data opacity. Then the resulting colors are added together. All overlapping midrange colors are lightened in the top layer. The opacity of layer and layer's data will affect the blend result.
plus	Colors in top and background layers are added together. All overlapping midrange colors are lightened in the top layer. This mode is also known as `add` or `linear-dodge`.
screen	Multiplies inverted colors in top and background layers then inverts the colors again. The resulting colors will be lighter than the original color with less contrast. Screen can produce many different levels of brightening depending on the luminosity values of the top layer. Can be thought of as the opposite of the `multiply` mode.
color-dodge	Divides colors in background layer by the inverted top layer. This lightens the background layer depending on the value of the top layer. The brighter the top layer, the more its color affects the background layer. Decreases the contrast between top and background layers resulting in saturated mid-tones and blown highlights.

Darken blend modes:

The following blend modes create darker results than all layers. In darken blend modes, pure white in the top layer will become transparent allowing the background layer to show through. Black in the top layer will stay unchanged. Any color that is darker than pure white is going to darken a top layer to varying degrees all the way to pure black.

The multiply blend mode is often used to highlight shadows, show contrast, or accentuate an aspect of a map. For example, you can use multiply blend mode on a topographic map displayed over hillshade when you want to have your elevation show through the topographic layer. See the intro to layer blending sample.

The multiply and darken modes can be used to have dark labels of the basemap to show through top layers. See the darken blending sample.

The color-burn mode works well with colorful top and background layers since it increases saturation in mid-tones. It increases the contrast by tinting pixels in overlapping areas in top and bottom layers more towards the top layer color. Use this blend mode, when you want an effect with more contrast than multiply or darken.

The following screenshots show how the multiply blend mode used for creating a physical map of the world that shows both boundaries and elevation. multiply-blend

Blend mode	Description
darken	Emphasizes the darkest parts of overlapping layers. Colors in the top layer become transparent if they are lighter than the overlapping colors in the background layer, allowing the background layer to show through completely.
multiply	Emphasizes the darkest parts of overlapping layers by multiplying colors of the top layer and the background layer. Midrange colors from top and background layers are mixed together more evenly.
color-burn	Intensifies the dark areas in all layers. It increases the contrast between top and background layers, by tinting colors in overlapping area towards the top color. To do this it inverts colors of the background layer, divides the result by colors of the top layer, then inverts the results.

Contrast blend modes:

The following blend modes create contrast by both lightening the lighter areas and darkening the darker areas in the top layer by using lightening or darkening blend modes to create the blend. The contrast blend modes will lighten the colors lighter than 50% gray ([128,128,128]), and darken the colors darker than 50% gray. 50% gray will be transparent in the top layer. Each mode can create a variety of results depending on the colors of top and background layers being blended together. The overlay blend mode makes its calculations based on the brightness of the colors in the background layer while all of the other contrast blend modes make their calculations based on the brightness of the top layer. Some of these modes are designed to simulate the effect of shining a light through the top layer, effectively projecting upon the layers beneath it.

Contrast blend modes can be used to increase the contrast and saturation to have more vibrant colors and give a punch to your layers. For example, you can duplicate a layer and set overlay blend mode on the top layer to increase the contrast and tones of your layer. You can also add a polygon layer with a white fill symbol over a dark imagery layer and apply soft-light blend mode to increase the brightness in the imagery layer.

The following screenshots show an effect of the overlay blend mode on a GraphicsLayer. The left image shows when the buffer graphics layer has the normal blend mode. As you can see, the gray color for the buffer polygon is blocking the intersecting census tracts. The right image shows when the overlay blend mode is applied to the buffer graphics layer. The overlay blend mode darkens or lightens the gray buffer polygon depending on the colors of the background layer while the census tracts layer is shining through. See this in action.

Normal blend mode	Overlay blend mode

Blend mode	Description
overlay	Uses a combination of `multiply` and `screen` modes to darken and lighten colors in the top layer with the background layer always shining through. The result is darker color values in the background layer intensify the top layer, while lighter colors in the background layer wash out overlapping areas in the top layer.
soft-light	Applies a half strength `screen` mode to lighter areas and half strength `multiply` mode to darken areas of the top layer. You can think of the `soft-light` as a softer version of the `overlay` mode.
hard-light	Multiplies or screens the colors, depending on colors of the top layer. The effect is similar to shining a harsh spotlight on the top layer.
vivid-light	Uses a combination of `color-burn` or `color-dodge` by increasing or decreasing the contrast, depending on colors in the top layer.

Component blend modes:

The following blend modes use primary color components, which are hue, saturation and luminosity to blend top and background layers. You can add a feature layer with a simple renderer over any layer and set hue, saturation, color or luminosity blend mode on this layer. With this technique, you create a brand new looking map.

The following screenshots show where the topo layer is blended with world hillshade layer with luminosity blend mode. The result is a drastically different looking map which preserves the brightness of the topo layer while adapting the hue and saturation of the hillshade layer.

Blend mode	Description
hue	Creates an effect with the hue of the top layer and the luminosity and saturation of the background layer.
saturation	Creates an effect with the saturation of the top layer and the hue and luminosity of the background layer. 50% gray with no saturation in the background layer will not produce any change.
luminosity	Creates effect with the luminosity of the top layer and the hue and saturation of the background layer. Can be thought of as the opposite of `color` blend mode.
color	Creates an effect with the hue and saturation of the top layer and the luminosity of the background layer. Can be thought of as the opposite of `luminosity` blend mode.

Composite blend modes:

The following blend modes can be used to mask the contents of top, background or both layers.

Destination modes are used to mask the data of the top layer with the data of the background layer.
Source modes are used to mask the data of the background layer with the data of the top layer.

The destination-in blend mode can be used to show areas of focus such as earthquakes, animal migration, or point-source pollution by revealing the underlying map, providing a bird’s eye view of the phenomenon. Check out multiple blending and groupLayer blending samples to see composite blend modes in action.

The following screenshots show feature and imagery layers on the left side on their own in the order they are drawn in the view. The imagery layer that contains land cover classification rasters. The feature layer contains 2007 county crops data. The right image shows the result of layer blending where destination-in blendMode is set on the imagery layer. As you can see, the effect is very different from the original layers. The blended result shows areas of cultivated crops only (where both imagery and feature layers overlap).

Blend mode	Description
destination-over	Destination/background layer covers the top layer. The top layer is drawn underneath the destination layer. You'll see the top layer peek through wherever the background layer is transparent or has no data.
destination-atop	Destination/background layer is drawn only where it overlaps the top layer. The top layer is drawn underneath the background layer. You'll see the top layer peek through wherever the background layer is transparent or has no data.
destination-in	Destination/background layer is drawn only where it overlaps with the top layer. Everything else is made transparent.
destination-out	Destination/background layer is drawn where it doesn't overlap the top layer. Everything else is made transparent.
source-atop	Source/top layer is drawn only where it overlaps the background layer. You will see the background layer peek through where the source layer is transparent or has no data.
source-in	Source/top layer is drawn only where it overlaps with the background layer. Everything else is made transparent.
source-out	Source/top layer is drawn where it doesn't overlap the background layer. Everything else is made transparent.
xor	Top and background layers are made transparent where they overlap. Both layers are drawn normal everywhere else.

Invert blend modes:

The following blend modes either invert or cancel out colors depending on colors of the background layer. These blend modes look for variations between top and background layers. For example, you can use difference or exclusion blend modes on two imagery layers of forest covers to visualize how forest covers changed from one year to another.

The invert blend mode can be used to turn any light basemap into a dark basemap to accommodate those who work in low-light conditions. The following screenshots show how setting the invert blend mode set on a feature layer with a simple renderer turns the world terrain basemap into a dark themed basemap in no time.

Blend mode	Description
difference	Subtracts the darker of the overlapping colors from the lighter color. When two pixels with the same value are subtracted, the result is black. Blending with black produces no change. Blending with white inverts the colors. This blending mode is useful for aligning layers with similar content.
exclusion	Similar to the `difference` blend mode, except that the resulting image is lighter overall. Overlapping areas with lighter color values are lightened, while darker overlapping color values become transparent.
minus	Subtracts colors of the top layer from colors of the background layer making the blend result darker. In the case of negative values, black is displayed.
invert	Inverts the background colors wherever the top and background layers overlap. The invert blend mode inverts the layer similar to a photographic negative.
reflect	This blend mode creates effects as if you added shiny objects or areas of light in the layer. Black pixels in the background layer are ignored as if they were transparent.

Default Value:"normal"

See also

Layer blending samples

capabilities Property capabilities Capabilities |null |undefinedreadonly

Describes the layer's supported capabilities.

Example

// Once the layer loads, check if the
// supportsAdd operations is enabled on the layer
featureLayer.when(function(){
  if (featureLayer.capabilities.operations.supportsAdd) {
    // if new features can be created in the layer
    // set up the UI for editing
    setupEditing();
  }
});

copyright Property copyright String |null |undefined

customParameters Property customParameters Object |null |undefined

A list of custom parameters appended to the URL of all resources fetched by the layer. It's an object with key-value pairs where value is a string. The layer's refresh() method needs to be called if the customParameters are updated at runtime.

Example

// send a custom parameter to your special service
let layer = new MapImageLayer({
  url: serviceUrl,
  customParameters: {
    "key": "my-special-key"
  }
});

dateFieldsTimeZone Property dateFieldsTimeZone String |null |undefined Since: ArcGIS Maps SDK for JavaScript 4.28 SubtypeGroupLayer since 4.20, dateFieldsTimeZone added at 4.28.

The time zone that dates are stored in. This property does not apply to date fields referenced by timeInfo or editFieldsInfo.

Even though dates are transmitted as UTC epoch values, this property may be useful when constructing date or time where clauses for querying. If constructing date or time where clauses, use FieldIndex.getTimeZone() to get the time zone for the given date field.

Set this property in the layer constructor if you are creating client-side feature layers to indicate the time zone of the date fields. The date field must exist in the fields array for client-side feature layers if the dateFieldsTimeZone is specified.

See also

Example

const layer = new FeatureLayer({
 // layer's fields definition
 fields: [
 {
   name: "ObjectID",
   alias: "ObjectID",
   type: "oid"
 }, {
   name: "type",
   alias: "Type",
   type: "string"
 }, {
   name: "recordedDate",
   alias: "recordedDate",
   type: "date"
 }],
 dateFieldsTimeZone: "America/New_York", // date field values in are eastern time zone
 objectIdField: "ObjectID", // inferred from fields array if not specified
 geometryType: "point", // geometryType and spatialReference are inferred from the first feature
                        // in the source array if they are not specified.
 spatialReference: { wkid: 4326 },
 source: graphics  //  an array of graphics with geometry and attributes
});
map.add(layer);

datesInUnknownTimezone Property datesInUnknownTimezone Booleanreadonly Since: ArcGIS Maps SDK for JavaScript 4.21 SubtypeGroupLayer since 4.20, datesInUnknownTimezone added at 4.21.

This property is set by the service publisher and indicates that dates should be considered without the local timezone. This applies to both requests and responses.

Known Limitations

This capability is only available with services published with ArcGIS Enterprise 10.9 or greater.
Editing is not supported for FeatureLayers if datesInUnknownTimezone is true. The editingEnabled property will be set to false.
When setting timeExtent in a query, filter or layer, dates must be defined in terms of UTC as illustrated in the code below.
When using layer.timeInfo.fullTimeExtent in conjunction with TimeSlider, the local timezone offset must be removed. See the code snippet below.

Default Value:false

See also

Examples

// Only download data for the year 2020.
// if the layer supports unknown time zone then create
// the dates in UTC
if (layer.datesInUnknownTimezone) {
  layer.timeExtent = new TimeExtent({
    start: new Date(Date.UTC(2020, 0, 1)),
    end: new Date(Date.UTC(2021, 0, 1))
  });
}
else {
  layer.timeExtent = new TimeExtent({
    start: new Date(2020, 0, 1),
    end: new Date(2021, 0, 1)
  });
}

// set up the timeslider for a service with an unknown timezone
if (layer.datesInUnknownTimezone) {
  const timeSlider = new TimeSlider({
    view: view,
    container: "timeSliderDiv",
    timeVisible: true,
  });
  view.ui.add(timeSlider, "bottom-left");

  view.whenLayerView(layer).then((layerView) => {
   // get the layer's fullTimeExtent and remove the local
   // time zone offset
    const timExtent = new TimeExtent({
      start: removeLocalOffset(layer.timeInfo.fullTimeExtent.start),
      end: removeLocalOffset(layer.timeInfo.fullTimeExtent.end)
    });

    timeSlider.fullTimeExtent = timExtent;
    timeSlider.stops = {
      interval: layer.timeInfo.interval;
    };
  });
}

// Remove the local time zone offset from dates
function removeLocalOffset(localTime) {
  return new Date(
    localTime.getUTCFullYear(),
    localTime.getUTCMonth(),
    localTime.getUTCDate(),
    localTime.getUTCHours(),
    localTime.getUTCMinutes(),
    localTime.getUTCSeconds(),
    localTime.getUTCMilliseconds()
  );
}

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

The name of the class. The declared class name is formatted as esri.folder.className.

definitionExpression Property definitionExpression String |null |undefined

The SQL where clause used to filter features on the client. Only the features that satisfy the definition expression are displayed in the View. Setting a definition expression is useful when the dataset is large and you don't want to bring all features to the client for analysis. Definition expressions may be set when a layer is constructed prior to it loading in the view or after it has been added to the map. If the definition expression is set after the layer has been added to the map, the view will automatically refresh itself to display the features that satisfy the new definition expression.

Examples

// Set definition expression in constructor to only display trees with scientific name Ulmus pumila
const layer = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Landscape_Trees/FeatureServer/0",
  definitionExpression: "Sci_Name = 'Ulmus pumila'"
});

// Set the definition expression directly on layer instance to only display trees taller than 50ft
layer.definitionExpression = "HEIGHT > 50";

displayField Property displayField String |null |undefined

The name of the layer's primary display field. The value of this property matches the name of one of the fields of the layer.

editFieldsInfo Property editFieldsInfo EditFieldsInforeadonly

The editor tracking fields, which record who adds or edits the data through the feature service and when edits are made.

editingEnabled Property editingEnabled Boolean

Determines if the layer is editable.

Default Value:true

See also

applyEdits

editingInfo Property editingInfo EditingInforeadonly

Specifies information about editing.

effect Property effect Effect |null |undefinedautocast

Effect provides various filter functions that can be performed on the layer to achieve different visual effects similar to how image filters work. This powerful capability allows you to apply css filter-like functions to layers to create custom visual effects to enhance the cartographic quality of your maps. This is done by applying the desired effect to the layer's effect property as a string or an array of objects to set scale dependent effects.

Notes

Set featureEffect property if different effects need to be applied features that meet or fail a specified filter.
If all of the following four properties are applied, then they will be applied in this order: featureEffect, effect, opacity and blendMode.

Known Limitations

The effect is not supported in 3D SceneViews.
The effect cannot be applied to a layer with a heatmap renderer.
The effect is not supported in layers with featureReduction of type cluster enabled.
See print for known printing limitations.

Default Value:null

See also

Examples

// the following effect will be applied to the layer at all scales
// brightness will be applied first, then hue-rotate followed by contrast
// changing order of the effects will change the final result
layer.effect = "brightness(5) hue-rotate(270deg) contrast(200%)";

// set a scale dependent bloom effect on the layer
layer.effect = [
  {
    scale: 36978595,
    value: "drop-shadow(3px, 3px, 4px)"
  },
  {
    scale: 18489297,
    value: "drop-shadow(2px, 2px, 3px)"
  },
  {
    scale: 4622324,
    value: "drop-shadow(1px, 1px, 2px)"
  }
];

effectiveCapabilities Property effectiveCapabilities Capabilities |null |undefinedreadonly Since: ArcGIS Maps SDK for JavaScript 4.26 SubtypeGroupLayer since 4.20, effectiveCapabilities added at 4.26.

Describes effective capabilities of the layer taking in to consideration privileges of the currently signed-in user.

effectiveEditingEnabled Property effectiveEditingEnabled Booleanreadonly Since: ArcGIS Maps SDK for JavaScript 4.26 SubtypeGroupLayer since 4.20, effectiveEditingEnabled added at 4.26.

Indicates whether the layer is editable taking in to consideration privileges of the currently signed-in user.

elevationInfo Property elevationInfo Object

Specifies how features are placed on the vertical axis (z). This property may only be used in a SceneView. See the ElevationInfo sample for an example of how this property may be used.

If the elevation info is not specified, the effective elevation depends on the context and could vary per graphic.

Properties

mode String

Defines how the feature is placed with respect to the terrain surface or 3D objects in the scene. If the geometry consists of multiple points (e.g. lines or polygons), the elevation is evaluated separately for each point. See the table below for a list of possible values.

elevation-info

Mode	Description
on-the-ground	Features are aligned to the Ground. If the scene contains an IntegratedMeshLayer or IntegratedMesh3DTilesLayer, then features are aligned to the IntegratedMeshLayer or IntegratedMesh3DTilesLayer. If features have z-values, then the z-values are ignored in this mode. Features with 2D symbols are draped on the Ground or IntegratedMeshLayer or IntegratedMesh3DTilesLayer. This is the default mode for layers without z-values containing Polyline, Polygon features or Point features rendered with ObjectSymbol3DLayer.
absolute-height	Features are placed at an absolute elevation (z-value) above sea level. This z-value is determined by the geometry's z-value (if present). If `featureExpressionInfo` is defined, the result of the expression is used instead of the geometry’s z-value. This mode doesn't take the elevation of the Ground or any other layers into account. This is the default value of features with any geometry type where hasZ is `true`.
relative-to-ground	Features are placed at an elevation relative to the Ground or IntegratedMeshLayer or IntegratedMesh3DTilesLayer. The feature's elevation is determined by summing up the elevation of the Ground or IntegratedMeshLayer or IntegratedMesh3DTilesLayer and the geometry's z-value (if present). If `featureExpressionInfo` is defined, the result of the expression is used instead of the geometry’s z-value. If the geometries don't have z-values, `relative-to-ground` is the default value for Point geometries rendered with IconSymbol3DLayers.
relative-to-scene	Features are aligned to extruded polygons, meshes, 3D Object SceneLayers or BuildingSceneLayers, depending on which one has higher elevation. If the feature is not directly above a building or any other feature, it is aligned to the elevation of the Ground or the IntegratedMeshLayer or IntegratedMesh3DTilesLayer. If present, the geometry's z-value is added to the elevation. If `featureExpressionInfo` is defined, the result of the expression is used instead of the geometry’s z-value.

Possible Values:"on-the-ground"|"relative-to-ground"|"absolute-height"|"relative-to-scene"

offset Number|null

optional

An elevation offset, which is added to the vertical position of the feature. If unit is not defined, the offset is in meters. When mode = "on-the-ground", this property has no effect.

featureExpressionInfo Object

optional

Defines how to override a feature's Z-value based on its attributes.

Specification: title String

optional
Title of the expression.

expression String

optional
An Arcade expression following the specification defined by the Arcade Feature Z Profile. Expressions may reference field values using the $feature profile variable and must return a number representing the z-value of the feature. When mode = "on-the-ground", this property has no effect. For line and polygon geometries the result of the expression is the same for all vertices of a feature.

unit ElevationUnit|null|undefined

optional

The unit for featureExpressionInfo and offset values.

See also

Arcade Feature Z Profile

fields Property fields Field[]autocast Autocasts from Object []

An array of fields in the layer. Each field represents an attribute that may contain a value for each feature in the layer. For example, a field named POP_2015, stores information about total population as a numeric value for each feature; this value represents the total number of people living within the geographic bounds of the feature.

Example

// define each field's schema
const fields = [
 new Field({
   name: "ObjectID",
   alias: "ObjectID",
   type: "oid"
 }), new Field({
   name: "description",
   alias: "Description",
   type: "string"
 }), new Field ({
   name: "title",
   alias: "Title",
   type: "string"
 })
];

// See the sample snippet for the source property
const layer = new SubtypeSublayer({
  // Object ID field is inferred from the fields array
  fields: fields
});

fieldsIndex Property fieldsIndex FieldsIndex |null |undefinedreadonly

A convenient property that can be used to make case-insensitive lookups for a field by name. It can also provide a list of the date fields in a layer.

Example

// lookup a field by name. name is case-insensitive
const field = layer.fieldsIndex.get("SoMeFiEld");

if (field) {
  console.log(field.name); // SomeField
}

floorInfo Property floorInfo LayerFloorInfoautocast

When a feature layer is configured as floor-aware, it has a floorInfo property defined. A floor-aware layer is a layer that contains indoor GIS data representing features that can be located on a specific floor of a building.

fullExtent Inherited Property fullExtent Extent |null |undefinedautocast Inherited from Layer

The full extent of the layer. By default, this is worldwide. This property may be used to set the extent of the view to match a layer's extent so that its features appear to fill the view. See the sample snippet below.

Example

// Once the layer loads, set the view's extent to the layer's fullextent
layer.when(function(){
  view.extent = layer.fullExtent;
});

gdbVersion Property gdbVersion String

The version of the geodatabase of the feature service data. Read the Overview of versioning topic for more details about this capability.

geometryFieldsInfo Property geometryFieldsInfo GeometryFieldsInfo |null |undefinedreadonly

Provides information on the system maintained area and length fields along with their respective units.

See also

ArcGIS REST API documentation

geometryType Property geometryType String |null |undefined

The geometry type of features in the layer. All features must be of the same type. This property is read-only when the layer is created from a url.

When creating a FeatureLayer from client-side features, this property is inferred by the geometryType of the features provided in the layer's source property. If the layer's source is an empty array at the time of initialization, this property must be set.

See also

Add an array of client-side features

hasM Property hasM Boolean

Indicates whether the client-side features in the layer have M (measurement) values. Use the supportsM property in the FeatureLayer's capabilities.data object to verify if M values are supported on feature service features.

Default Value:undefined

hasZ Property hasZ Boolean

Indicates whether the client-side features in the layer have Z (elevation) values. Refer to elevationInfo for details regarding placement and rendering of features with z-values in 3D SceneViews. Use the supportsZ property in the FeatureLayer's capabilities.data object to verify if Z values are supported on feature service features.

Default Value:undefined

historicMoment Property historicMoment Dateautocast

The historic moment to query. If historicMoment is not specified, the query will apply to the current features.

id Inherited Property id String Inherited from Layer

The unique ID assigned to the layer. If not set by the developer, it is automatically generated when the layer is loaded.

isTable Property isTable Booleanreadonly

Returns true if the layer is loaded from a non-spatial table in a service. Non-spatial tables do not have a spatial column that represent geographic features.

Default Value:false

See also

layerId Property layerId Number |null |undefined

The layer ID, or layer index, of a Feature Service layer. This is particularly useful when loading a single FeatureLayer with the portalItem property from a service containing multiple layers. You can specify this value in one of two scenarios:

When loading the layer via the portalItem property.
When pointing the layer url directly to the Feature Service.

If a layerId is not specified in either of the above scenarios, then the first layer in the service (layerId = 0) is selected.

Examples

// loads the third layer in the given Portal Item
const layer = new FeatureLayer({
  portalItem: {
    id: "8d26f04f31f642b6828b7023b84c2188"
  },
  layerId: 2
});

// If not specified, the first layer (layerId: 0) will be returned
const layer = new FeatureLayer({
  portalItem: {
    id: "8d26f04f31f642b6828b7023b84c2188"
  }
});

// Can also be used if URL points to service and not layer
const layer = new FeatureLayer({
  // Notice that the url doesn't end with /2
  url: "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/MonterreyBayCanyon_WFL/FeatureServer",
  layerId: 2
});

// This code returns the same layer as the previous snippet
const layer = new FeatureLayer({
  // The layer id is specified in the URL
  url: "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/MonterreyBayCanyon_WFL/FeatureServer/2",
});

listMode Inherited Property listMode String Inherited from Layer

Indicates how the layer should display in the LayerList widget. The possible values are listed below.

Value	Description
show	The layer is visible in the table of contents.
hide	The layer is hidden in the table of contents.
hide-children	If the layer is a GroupLayer, BuildingSceneLayer, KMLLayer, MapImageLayer, TileLayer or WMSLayer, hide the children layers from the table of contents.

Possible Values:"show" |"hide" |"hide-children"

Default Value:"show"

loadError Inherited Property loadError Errorreadonly Inherited from Layer

The Error object returned if an error occurred while loading.

Default Value:null

loadStatus Inherited Property loadStatus Stringreadonly Inherited from Layer

Represents the status of a load operation.

Value	Description
not-loaded	The object's resources have not loaded.
loading	The object's resources are currently loading.
loaded	The object's resources have loaded without errors.
failed	The object's resources failed to load. See loadError for more details.

Possible Values:"not-loaded" |"loading" |"failed" |"loaded"

Default Value:"not-loaded"

loadWarnings Inherited Property loadWarnings Object[]readonly Inherited from Layer

A list of warnings which occurred while loading.

loaded Inherited Property loaded Booleanreadonly Inherited from Layer

Indicates whether the layer's resources have loaded. When true, all the properties of the object can be accessed.

Default Value:false

maxScale Property maxScale Number

The maximum scale (most zoomed in) at which the layer is visible in the view. If the map is zoomed in beyond this scale, the layer will not be visible. A value of 0 means the layer does not have a maximum scale. The maxScale value should always be smaller than the minScale value, and greater than or equal to the service specification.

Default Value:0

Examples

// The layer will not be visible when the view is zoomed in beyond a scale of 1:1,000
layer.maxScale = 1000;

// The layer's visibility is not restricted to a maximum scale.
layer.maxScale = 0;

minScale Property minScale Number

The minimum scale (most zoomed out) at which the layer is visible in the view. If the map is zoomed out beyond this scale, the layer will not be visible. A value of 0 means the layer does not have a minimum scale. The minScale value should always be larger than the maxScale value, and lesser than or equal to the service specification.

Default Value:0

Examples

// The layer will not be visible when the view is zoomed out beyond a scale of 1:3,000,000
layer.minScale = 3000000;

// The layer's visibility is not restricted to a minimum scale.
layer.minScale = 0;

objectIdField Property objectIdField String

The name of an oid field containing a unique value or identifier for each feature in the layer. This property is required when constructing a FeatureLayer from a collection of client-side features. If not specified, it will be inferred from the fields array.

See also

fields
Add an array of client-side features

Example

// See the sample snippet for the source and fields properties
const layer = new FeatureLayer({
  source: features,
  fields: fields,
  objectIdField: "ObjectID",  // field name of the Object IDs
  geometryType: "point",
  renderer: <renderer>
});

opacity Inherited Property opacity Number Inherited from Layer

The opacity of the layer. This value can range between 1 and 0, where 0 is 100 percent transparent and 1 is completely opaque.

Default Value:1

Example

// Makes the layer 50% transparent
layer.opacity = 0.5;

outFields Property outFields String[]

An array of field names from the service to include with each feature. To fetch the values from all fields in the layer, use ["*"]. Fields specified in outFields will be requested alongside with required fields for rendering, labeling and setting the elevation info for the layer. The required fields and outFields are used to populate SubtypeGroupLayerView.availableFields. Set this property to include the fields that will be used for client-side queries if the fields are not part of required fields used for rendering.

Default Value:null

See also

SubtypeGroupLayerView.availableFields
fieldUtils

Examples

// Includes all fields from the service in the layer
fl.outFields = ["*"];

// Get the specified fields from the service in the layer
// These fields will be added to SubtypeGroupLayerView.availableFields
// along with rendering and labeling fields. Use these fields
// for client-side filtering and querying.
fl.outFields = ["NAME", "POP_2010", "FIPS", "AREA"];

// set the outFields for the layer coming from webmap
webmap.when(function () {
  layer = webmap.layers.at(1);
  layer.outFields = ["*"];
});

The parent to which the layer belongs.

persistenceEnabled Property persistenceEnabled Boolean Since: ArcGIS Maps SDK for JavaScript 4.28 SubtypeGroupLayer since 4.20, persistenceEnabled added at 4.28.

Enable persistence of the layer in a WebMap or WebScene.

Default Value:true

portalItem Property portalItem PortalItem |null |undefined

The portal item from which the layer is loaded. If the portal item references a Feature Service or Scene Service, then you can specify a single layer to load with the layerId property.

Beginning with version 4.17, it is possible to load tables from feature service items hosted in ArcGIS Online and ArcGIS Enterprise. This only applies to feature layers, and will successfully load if FeatureLayer.isTable returns true.

Examples

// While this example uses FeatureLayer, this same pattern can be
// used for other layers that may be loaded from portalItem ids.
const layer = new FeatureLayer({
  portalItem: {  // autocasts as new PortalItem()
    id: "caa9bd9da1f4487cb4989824053bb847"
  }  // the first layer in the service is returned
});

// Set hostname when using an on-premise portal (default is ArcGIS Online)
// esriConfig.portalUrl = "http://myHostName.esri.com/arcgis";

// While this example uses FeatureLayer, this same pattern can be
// used for SceneLayers.
const layer = new FeatureLayer({
  portalItem: {  // autocasts as new PortalItem()
    id: "8d26f04f31f642b6828b7023b84c2188"
  },
  // loads the third item in the given feature service
  layerId: 2
});

// Initialize GeoJSONLayer by referencing a portalItem id pointing to geojson file.
const layer = new GeoJSONLayer({
  portalItem: new PortalItem({
    id: "81e769cd7031482797e1b0768f23c7e1",
    // optionally define the portal, of the item.
    // if not specified, the default portal defined is used.
    // see https://developers.arcgis.com/javascript/latest/api-reference/esri-config.html#portalUrl
    portal: new Portal({
      url: "https://jsapi.maps.arcgis.com/"
    })
  }
});

// This snippet loads a table hosted in ArcGIS Online.
const table = new FeatureLayer({
  portalItem: { // autocasts as esri/portal/PortalItem
    id: "123f4410054b43d7a0bacc1533ceb8dc"
  }
});

// Before adding the table to the map, it must first be loaded and confirm it is the right type.
table.load().then(function() {
  if (table.isTable) {
    map.tables.add(table);
  }
});

preferredTimeZone Property preferredTimeZone String |null |undefinedreadonly Since: ArcGIS Maps SDK for JavaScript 4.28 SubtypeGroupLayer since 4.20, preferredTimeZone added at 4.28.

The IANA time zone the author of the service intended data from date fields to be viewed in.

refreshInterval Property refreshInterval Number

Refresh interval of the layer in minutes. Value of 0 indicates no refresh.

Default Value:0

See also

refresh()
refresh event

Example

// the layer will be refreshed every minute.
layer.refreshInterval = 1;

relationships Property relationships Relationship[]readonly

Array of relationships set up for the layer. Each object in the array describes the layer's relationship with another layer or table.

See also

queryRelatedFeatures

Example

// print out layer's relationship length and each relationship info to console
layer.when(function () {
  console.log("layer relationships", layer.relationships.length);

  layer.relationships.forEach(function (relationship) {
    console.log("relationship id:", relationship.id)
    console.log("relationship cardinality:", relationship.cardinality)
    console.log("relationship key field:", relationship.keyField)
    console.log("relationship name:", relationship.name)
    console.log("relationship relatedTableId:", relationship.relatedTableId)
  });
});

returnM Property returnM Boolean

When true, indicates that M values will be returned. When false, indicates that M values will never be returned. The layer view determines whether to include M values in feature queries when the property value is undefined.

Default Value:undefined

returnZ Property returnZ Boolean

When true, indicates that z-values will always be returned. When false, indicates that z-values will never be returned. The layer view determines whether to include z-values in feature queries when the property value is undefined.

Default Value:undefined

serviceDefinitionExpression Property serviceDefinitionExpression String |null |undefinedreadonly

The service definition expression limits the features available for display and query. You can define additional filters on the layer in addition to the service definition expression by setting layer's definitionExpression. For example, if the service definition expression is set to display data where "STATE_NAME = 'California'" you could use definitionExpression to only display a subset of the features in California, for example using "COUNTY='San Diego'".

See also

Set hosted feature layer view definition

sourceJSON Property sourceJSON Object |null |undefined

The feature service's metadata JSON exposed by the ArcGIS REST API. While most commonly used properties are exposed on the FeatureLayer class directly, this property gives access to all information returned by the feature service. This property is useful if working in an application built using an older version of the API which requires access to feature service properties from a more recent version.

spatialReference Property spatialReference SpatialReferenceautocast

The spatial reference of the layer. When creating the layer from a url, the spatial reference is read from the service.

When creating a FeatureLayer from client-side features, this property is inferred from the geometries of the features provided in the source property.

sublayers Property sublayers Collection<SubtypeSublayer>autocast Autocasts from Object []

A Collection of SubtypeSublayer objects that allow you to alter the properties of one or more sublayers of the SubtypeGroupLayer. If this property is not specified, all the sublayers from the feature service are displayed as defined in the service.

All sublayers must be referenced using the subtypeCode to identify the sublayer. The sublayers may be added, removed, or reordered using the Collection methods. Because Sublayer extends Accessor, its properties may be watched.

Example

// Only includes the first SubtypeSublayer from the SubtypeGroupLayer
let layer = new SuptypeGroupLayer({
  url: "https://sampleserver7.arcgisonline.com/server/rest/services/UtilityNetwork/NapervilleElectric/FeatureServer/0",
  sublayers: [{
    subtypeCode: 0,
    visible: true,
    renderer: {
      type: "simple",
      symbol: {
        type: "simple-marker",
        style: "circle",
        color: [120, 120, 120, 255],
        size: 6
      }
    }
  }]
});

subtypeField Property subtypeField String |null |undefinedreadonly

The name of the field which holds the id of the subtypes.

subtypes Property subtypes Subtype[] |null |undefinedreadonly

An array of subtypes defined in the layer.

See also

Introduction to subtypes

timeExtent Property timeExtent TimeExtent |null |undefinedautocast

The layer's time extent. When the layer's useViewTime is false, the layer instructs the view to show data from the layer based on this time extent. If the useViewTime is true, and both layer and view time extents are set, then features that fall within the intersection of the view and layer time extents will be displayed. For example, if the layer's time extent is set to display features between 1970 and 1975 and the view has a time extent set to 1972-1980, the effective time on the feature layer will be 1972-1975.

Default Value:null

Examples

if (!layer.useViewTime) {
  if (layer.timeExtent) {
    console.log("Current timeExtent:", layer.timeExtent.start, " - ", layer.timeExtent.end}
  } else {
    console.log("The layer will display data within the view's timeExtent.");
    console.log("Current view.timeExtent:", view.timeExtent.start, " - ", view.timeExtent.end}
  }
}

// set the timeExtent on the layer and useViewTime false
// In this case, the layer will honor its timeExtent and ignore
// the view's timeExtent
const layer = new ImageryLayer({
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/ScientificData/SeaTemperature/ImageServer",
  timeExtent: {
    start: new Date(2014, 4, 18),
    end: new Date(2014, 4, 19)
  },
  useViewTime: false
});

// timeExtent is set on the layer and the view
// In this case, the layer will display features that fall
// within the intersection of view and layer time extents
// features within Jan 1, 1976 - Jan 1, 1981 will be displayed
const view = new MapView({
  timeExtent: {
    start: new Date(1976, 0, 1),
    end: new Date(2002, 0, 1)
  }
});
const layer = new FeatureLayer({
  url: myUrl,
  timeExtent: {
    start: new Date(1974, 0, 1),
    end: new Date(1981, 0, 1)
  }
});

timeInfo Property timeInfo TimeInfo |null |undefinedautocast

TimeInfo provides information such as date fields that store start and end time for each feature and the fullTimeExtent for the layer. The timeInfo property, along with its startField and endField properties, must be set at the time of layer initialization if it is being set for a CSVLayer, GeoJSONLayer or FeatureLayer initialized from client-side features. The fullTimeExtent for timeInfo is automatically calculated based on its startField and endField properties. The timeInfo parameters cannot be changed after the layer is loaded.

TimeInfo's startField and endField can be date, date-only or timestamp-offset field type for FeatureLayer and MapImageLayer.

Default Value:null

Example

// create geojson layer from usgs earthquakes geojson feed
const geojsonLayer = new GeoJSONLayer({
  url: "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson",
  copyright: "USGS Earthquakes",
  fields: [
    { "name": "mag", "type": "double" },
    { "name": "place", "type": "string" },
    { "name": "time", "type": "date" }, // date field
    { "name": "depth", "type": "double" }
  ],
  // timeInfo can be used to do temporal queries
  // set the startField and endField.
  // timeExtent is automatically calculated from the
  // the start and end date fields
  // The date values must be in milliseconds number from the UNIX epoch specified in UTC.
  timeInfo: {
    startField: "time"
  }
});

timeOffset Property timeOffset TimeInterval |null |undefinedautocast

A temporary offset of the time data based on a certain TimeInterval. This allows users to overlay features from two or more time-aware layers with different time extents. For example, if a layer has data recorded for the year 1970, an offset value of 2 years would temporarily shift the data to 1972. You can then overlay this data with data recorded in 1972. A time offset can be used for display purposes only. The query and selection are not affected by the offset.

Default Value:null

Example

// Offset a CSV Layer containing hurricanes from 2015 so that they appear in 2019 (+4 years).
let layer = new CSVLayer({
  url: `hurricanes-and-storms-2015.csv`,
  timeOffset: {
    value: 4,
    unit: "years"
  },
  timeInfo: {
    startField: "ISO_time"
  },
  renderer: {
    type: "simple",
    symbol: {
      type: "simple-marker",
      size: 6,
      color: "red",
      outline: {
        width: 0.5,
        color: "black"
      }
    }
  }
});

title Property title String |null |undefined

The title of the layer used to identify it in places such as the Legend and LayerList widgets.

When loading a layer by service url, the title is derived from the service name. If the service has several layers, then the title of each layer will be the concatenation of the service name and the layer name. When the layer is loaded from a portal item, the title of the portal item will be used instead. Finally, if a layer is loaded as part of a webmap or a webscene, then the title of the layer as stored in the webmap/webscene will be used.

type Property type Stringreadonly

For SubtypeGroupLayer the type is always "subtype-group".

url Property url String

The absolute URL of the REST endpoint of the layer, non-spatial table or service. The URL may either point to a resource on ArcGIS Enterprise or ArcGIS Online.

If the url points directly to a service, then the layer must be specified in the layerId property. If no layerId is given, then the first layer in the service will be loaded.

Examples

// Hosted Feature Service on ArcGIS Online
layer.url = "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/origins/FeatureServer/0";

// Layer from Map Service on ArcGIS Server
layer.url = "http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/2";

// Can also be used if URL points to service and not layer
const layer = new FeatureLayer({
  // Notice that the url doesn't end with /2
  url: "http://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/MonterreyBayCanyon_WFL/FeatureServer",
  layerId: 2
});

// Non-spatial table in San Francisco incidents service.
const table = new FeatureLayer({
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/SF311/FeatureServer/1"
});
// table must be loaded so it can be used in the app.
table.load().then(function() {
  // table is loaded. ready to be queried.
});

useViewTime Property useViewTime Boolean

Determines if the time enabled layer will update its temporal data based on the view's timeExtent. When false, the layer will display its temporal data based on the layer's timeExtent, regardless of changes to the view. If both view and layer time extents are set while this property is true, then the features that fall within the intersection of the view and layer time extents will be displayed. For example, if a layer's time extent is set to display features between 1970 and 1975 and the view has a time extent set to 1972-1980, the effective time on the feature layer will be 1972-1975.

Changing useViewTime to false does not affect layer's visibilityTimeExtent.

Default Value:true

Example

if (featureLayer.useViewTime) {
  console.log("Displaying data between:", view.timeExtent.start, " - ", view.timeExtent.end);
}

version Property version Number |null |undefinedreadonly

The version of ArcGIS Server in which the layer is published.

Example

// Prints the version number to the console - e.g. 10.2, 10.3, 10.41, etc.
console.log(layer.version);

visibilityTimeExtent Inherited Property visibilityTimeExtent TimeExtent |null |undefinedautocast Inherited from Layer Since: ArcGIS Maps SDK for JavaScript 4.30 Layer since 4.0, visibilityTimeExtent added at 4.30.

Specifies a fixed time extent during which a layer should be visible. This property can be used to configure a layer that does not have time values stored in an attribute field to work with time. Once configured, the TimeSlider widget will display the layer within the set time extent. In the case that only one of the start or end date values are available, the layer remains visible indefinitely in the direction where there is no time value.

Aerial imagery can capture seasonal variations in vegetation, water bodies, and land use patterns. For example, in agricultural regions, aerial imageries taken during different growing seasons provide insights into crop health and productivity. Defining a fixed time extent on imageries from specific time periods provides temporal context and facilitates focused analysis based on specific time periods or events.

Default Value:null

See also

Sample - GraphicsLayer with visibilityTimeExtent

visible Inherited Property visible Boolean Inherited from Layer

Indicates if the layer is visible in the View. When false, the layer may still be added to a Map instance that is referenced in a view, but its features will not be visible in the view.

Default Value:true

Example

// The layer is no longer visible in the view
layer.visible = false;

// Watch for changes in the layer's visibility
// and set the visibility of another layer when it changes
reactiveUtils.watch(
  () => layer.visible,
  (visible) => {
    if (visible) {
      anotherLayer.visible = true;
    } else {
      anotherLayer.visible = false;
    }
  }
);

Method Overview

Show inherited methods

Hide inherited methods

Return Type	Summary	Class
Promise<FeatureEditResult>	Adds an attachment to a feature.	SubtypeGroupLayer
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
Promise<EditsResult>	Applies edits to features in a layer.	SubtypeGroupLayer
	Cancels a load() operation if it is already in progress.	Layer
this	Creates a deep clone of this object.	SubtypeGroupLayer
Promise<LayerView>	Called by the views, such as MapView and SceneView, when the layer is added to the Map.layers collection and a layer view must be created for it.	Layer
Query	Creates query parameter object that can be used to fetch features that satisfy the layer's configurations such as definitionExpression, gdbVersion, and historicMoment.	SubtypeGroupLayer
Promise<FeatureEditResult []>	Deletes attachments from a feature.	SubtypeGroupLayer
	Destroys the layer and any associated resources (including its portalItem, if it is a property on the layer).	Layer
Boolean	Emits an event on the instance.	Layer
Promise<Object>	Fetches custom attribution data for the layer when it becomes available.	Layer
SubtypeSublayer	Returns the sublayer to which the given feature belongs.	SubtypeGroupLayer
SubtypeSublayer	Returns the sublayer with the subtypeCode that matches the number passed as an argument.	SubtypeGroupLayer
Field	Returns the Field instance for a field name (case-insensitive).	SubtypeGroupLayer
Domain	Returns the Domain associated with the given field name.	SubtypeGroupLayer
Boolean	Indicates whether there is an event listener on the instance that matches the provided event name.	Layer
Boolean	Returns true if a named group of handles exist.	Accessor
Boolean	`isFulfilled()` may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).	Layer
Boolean	`isRejected()` may be used to verify if creating an instance of the class is rejected.	Layer
Boolean	`isResolved()` may be used to verify if creating an instance of the class is resolved.	Layer
Promise	Loads the resources referenced by this class.	Layer
Promise<Sublayer>	Loads all of the sublayers.	SubtypeGroupLayer
Object	Registers an event handler on the instance.	Layer
Promise<Object>	Query information about attachments associated with features.	SubtypeGroupLayer
Promise<Object>	Executes a Query against the feature service and returns the Extent of features that satisfy the query.	SubtypeGroupLayer
Promise<Number>	Executes a Query against the feature service and returns the number of features that satisfy the query.	SubtypeGroupLayer
Promise<FeatureSet>	Executes a Query against the feature service and returns a FeatureSet, which can be accessed using the `.then()` method once the promise resolves.	SubtypeGroupLayer
Promise<Number []>	Executes a Query against the feature service and returns an array of Object IDs for features that satisfy the input query.	SubtypeGroupLayer
Promise<Object>	Executes a RelationshipQuery against the feature service and returns FeatureSets grouped by source layer or table objectIds.	SubtypeGroupLayer
Promise<Object>	Executes a RelationshipQuery against the feature service and when resolved, it returns an `object` containing key value pairs.	SubtypeGroupLayer
	Fetches all the data for the layer.	SubtypeGroupLayer
	Removes a group of handles owned by the object.	Accessor
Promise<PortalItem>	Saves the layer to its existing portal item in the Portal authenticated within the user's current session.	SubtypeGroupLayer
Promise<PortalItem>	Saves the layer to a new portal item in the Portal authenticated within the user's current session.	SubtypeGroupLayer
Promise<FeatureEditResult>	Updates an existing attachment for a feature.	SubtypeGroupLayer
Promise	`when()` may be leveraged once an instance of the class is created.	Layer

Method Details

addAttachment Method addAttachment(feature, attachment){Promise<FeatureEditResult>}

Adds an attachment to a feature. This operation is available only if the layer's capabilities.data.supportsAttachment is set to true.

Parameters

feature Graphic

Feature to which the attachment is to be added.

attachment HTMLFormElement|FormData

HTML form that contains a file upload field pointing to the file to be added as an attachment.

Returns

Type	Description
Promise<FeatureEditResult>	When resolved, a FeatureEditResult object is returned. FeatureEditResult indicates whether or not the edit was successful. If successful, the `objectId` of the result is the Id of the new attachment. If unsuccessful, it also includes an error `name` and error `message`.

See also

capabilities.data.supportsAttachment

Example

view.when(function () {
  view.on("click", function (event) {

    view.hitTest(event).then(function (response) {
      const feature = response.results[0].graphic;

      // The form is defined as below in the html.
      // For enterprise services:
      // 1. File input name must be "attachment"
      // <form id="attachmentForm">
      //   Select a file: <input type="file" name="attachment">
      // </form>
      const attachmentForm = document.getElementById("attachmentForm");
      const formData = new FormData(attachmentForm);

      // For enterprise services - add input with name:f and value:json
      formData.append("f","json");
      const form = new FormData();
      form.set("attachment", file);
      form.append("f","json")
      let form = document.getElementById("myForm");

      // Add an attachment to the clicked feature.
      // The attachment is taken from the form.
      layer.addAttachment(feature, form).then(function (result) {
        console.log("attachment added: ", result);
      })
      .catch(function (err) {
        console.log("attachment adding failed: ", err);
      });
    });
  });
});

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, addHandles added at 4.25.

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();

Parameters

handleOrHandles WatchHandle|WatchHandle []

Handles marked for removal once the object is destroyed.

groupKey *

optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

applyEdits Method applyEdits(edits, options){Promise<EditsResult>}

Applies edits to features in a layer. New features can be created and existing features can be updated or deleted. Feature geometries and/or attributes may be modified. Only applicable to layers in a feature service and client-side features set through the FeatureLayer's source property. Attachments can also be added, updated or deleted.

If client-side features are added, removed or updated at runtime using applyEdits() then use FeatureLayer's queryFeatures() method to return updated features.

When calling the applyEdits method on a service that does not have vertical coordinate system information, the z-values of the geometries in the edits object will automatically be converted to match the spatial reference of the layer. Example: The service has a horizontal spatial reference with feet units, and applyEdits() is called with z-values based on meter units, then the method will automatically convert the z values from meter to feet units.

As of version 4.17, using applyEdits to add geometries with z-values to a FeatureLayer with hasZ: false no longer silently drops the z-value and now throws an error.

Parameters

Specification

edits Object

Object containing features and attachments to be added, updated or deleted.

Specification

addFeatures Graphic []|Collection<Graphic>

optional

An array or a collection of features to be added. Values of non nullable fields must be provided when adding new features. Date fields must have numeric values representing universal time.

updateFeatures Graphic []|Collection<Graphic>

optional

An array or a collection of features to be updated. Each feature must have valid objectId. Values of non nullable fields must be provided when updating features. Date fields must have numeric values representing universal time.

deleteFeatures Graphic []|Collection<Graphic>|Object []

optional

An array or a collection of features, or an array of objects with objectId or globalId of each feature to be deleted. When an array or collection of features is passed, each feature must have a valid objectId. When an array of objects is used, each object must have a valid value set for objectId or globalId property.

addAttachments AttachmentEdit []

optional

An array of attachments to be added. Applies only when the options.globalIdUsed parameter is set to true. User must provide globalIds for all attachments to be added.

updateAttachments AttachmentEdit []

optional

An array of attachments to be updated. Applies only when the options.globalIdUsed parameter is set to true. User must provide globalIds for all attachments to be updated.

deleteAttachments String []

optional

An array of globalIds for attachments to be deleted. Applies only when the options.globalIdUsed parameter is set to true.

options Object

optional

Additional edit options to specify when editing features or attachments.

Specification

gdbVersion String

optional

The geodatabase version to apply the edits. This parameter applies only if the capabilities.data.isVersioned property of the layer is true. If the gdbVersion parameter is not specified, edits are made to the published map’s version.

returnEditMoment Boolean

optional

Indicates whether the edit results should return the time edits were applied. If true, the feature service will return the time edits were applied in the edit result's editMoment property. Only applicable with ArcGIS Server services only. This option was added at the version 4.20.

returnServiceEditsOption String

optional

If set to original-and-current-features, the EditedFeatureResult parameter will be included in the applyEdits response. It contains all edited features participating in composite relationships in a database as result of editing a feature. Note that even for deletions, the geometry and attributes of the deleted feature are returned. The original-and-current-features option is only valid when rollbackOnFailureEnabled is true. The default value is none, which will not include the EditedFeatureResult parameter in the response. This is only applicable with ArcGIS Server services only. This option was added at the version 4.20.

Possible Values:"none"|"original-and-current-features"

rollbackOnFailureEnabled Boolean

optional

Indicates whether the edits should be applied only if all submitted edits succeed. If false, the server will apply the edits that succeed even if some of the submitted edits fail. If true, the server will apply the edits only if all edits succeed. The layer's capabilities.editing.supportsRollbackOnFailure property must be true if using this parameter. If supportsRollbackOnFailure is false for a layer, then rollbackOnFailureEnabled will always be true, regardless of how the parameter is set.

globalIdUsed Boolean

optional

Indicates whether the edits can be applied using globalIds of features or attachments. This parameter applies only if the layer's capabilities.editing.supportsGlobalId property is true. When false, globalIds submitted with the features are ignored and the service assigns new globalIds to the new features. When true, the globalIds must be submitted with the new features. When updating existing features, if the globalIdUsed is false, the objectIds of the features to be updated must be provided. If the globalIdUsed is true, globalIds of features to be updated must be provided. When deleting existing features, set this property to false as deletes operation only accepts objectIds at the current version of the API.

When adding, updating or deleting attachments, globalIdUsed parameter must be set to true and the attachment globalId must be set. For new attachments, the user must provide globalIds. In order for an attachment to be updated or deleted, clients must include its globalId. Attachments are not supported in an edit payload when globalIdUsed is false.

// add an image attachments to features
function addAttachment(selectedFeature) {
  const blob = new Blob(byteArrays, { type: "image/png" });
  addAttachments.push({
    feature: selectedFeature,
    attachment: {
      globalId: "8c4d6085-a33c-42a0-8e11-21e9528bca0d",
      name: "brokenLight",
      data: blob
    }
  });

  const edits = {
    addAttachments: addAttachments
  };

  const options = {
    // globalIdUsed has to be true when adding, updating or deleting attachments
    globalIdUsed: true,
    rollbackOnFailureEnabled: true
  };

  featureLayer.applyEdits(edits, options).then(function(results) {
    console.log("edits added: ", results);
  });
}

Returns

Type	Description
Promise<EditsResult>	When resolved, an EditsResult object is returned.

See also

Sample - Edit features

Example

function addFeature(geometry) {
  const attributes = {};
  attributes["Description"] = "This is the description";
  attributes["Address"] = "380 New York St";

  // Date.now() returns number of milliseconds elapsed
  // since 1 January 1970 00:00:00 UTC.
  attributes["Report_Date"] = Date.now();

  const addFeature =  new Graphic({
    geometry: geometry,
    attributes: attributes
  });

  const deleteFeatures = [
    { objectId: 467 },
    { objectId: 500 }
  ];

  // or specify globalIds of features to be deleted
  // const deleteFeature = [
  //  { globalId: "18633204-1801-4d35-a73a-174563608ad9" }
  // ];

  const promise = featureLayer.applyEdits({
    addFeatures: [addFeature],
    deleteFeatures: deleteFeatures
  });
}

cancelLoad Inherited Method cancelLoad() Inherited from Layer

Cancels a load() operation if it is already in progress.

clone Method clone(){this}

Creates a deep clone of this object. Any properties that store values by reference will be assigned copies of the referenced values on the cloned instance.

Returns

Type	Description
this	A deep clone of the class instance that invoked this method.

createLayerView Inherited Method createLayerView(view, options){Promise<LayerView>} Inherited from Layer

Called by the views, such as MapView and SceneView, when the layer is added to the Map.layers collection and a layer view must be created for it. This method is used internally and there is no use case for invoking it directly.

Parameters

view *

The parent view.

options Object

optional

An object specifying additional options. See the object specification table below for the required properties of this object.

Specification

signal AbortSignal

optional

A signal to abort the creation of the layerview.

Returns

Type	Description
Promise<LayerView>	Resolves with a LayerView instance.

See also

Sample - Custom WebGL layer view

createQuery Method createQuery(){Query}

Creates query parameter object that can be used to fetch features that satisfy the layer's configurations such as definitionExpression, gdbVersion, and historicMoment. It will return Z and M values based on the layer's data capabilities. It sets the query parameter's outFields property to ["*"]. The results will include geometries of features and values for all available fields for client-side queries or all fields in the layer for server side queries.

Returns

Type	Description
Query	The query object representing the layer's definition expression and other configurations.

See also

Sample - Query features from a SubtypeGroupLayer

Examples

// this snippet shows the query parameter object that is returned
// from SubtypeGroupLayer.createQuery().
const queryParams = new Query();
const dataCapabilities = layer.get<DataCapabilities>("capabilities.data");

queryParams.gdbVersion = layer.gdbVersion;
queryParams.historicMoment = layer.historicMoment;
queryParams.returnGeometry = true;

if (dataCapabilities) {
  if (dataCapabilities.supportsZ && layer.returnZ != null) {
    queryParams.returnZ = layer.returnZ;
  }

  if (dataCapabilities.supportsM && layer.returnM != null) {
    queryParams.returnM = layer.returnM;
  }
}

queryParams.outFields = ["*"];
queryParams.where = layer.definitionExpression || "1=1";
queryParams.multipatchOption = layer.geometryType === "multipatch" ? "xyFootprint" : null;

// Get a query object for the layer's current configuration
// queryParams.outFields will be set to ["*"] to get values
// for all available fields.
const queryParams = layer.createQuery();
// set a geometry for filtering features by a region of interest
queryParams.geometry = extentForRegionOfInterest;
// Add to the layer's current definitionExpression
queryParams.where = queryParams.where + " AND TYPE = 'Extreme'";

// query the layer with the modified params object
layer.queryFeatures(queryParams).then(function(results){
  // prints the array of result graphics to the console
  console.log(results.features);
});

deleteAttachments Method deleteAttachments(feature, attachmentIds){Promise<FeatureEditResult[]>}

Deletes attachments from a feature. This operation is available only if the layer's capabilities.data.supportsAttachment is set to true.

Parameters

feature Graphic

Feature containing attachments to be deleted.

attachmentIds Number []

Ids of the attachments to be deleted.

Returns

Type	Description
Promise<FeatureEditResult []>	When resolved, an array of FeatureEditResults is returned. FeatureEditResult indicates whether or not the edit was successful. If successful, the `objectId` of the result is the Id of the new attachment. If unsuccessful, it also includes an error `name` and error `message`.

See also

capabilities.data.supportsAttachment

destroy Inherited Method destroy() Inherited from Layer

Destroys the layer and any associated resources (including its portalItem, if it is a property on the layer). The layer can no longer be used once it has been destroyed.

The destroyed layer will be removed from its parent object like Map, WebMap, WebScene, Basemap, Ground, or GroupLayer.

See also

emit Inherited Method emit(type, event){Boolean} Inherited from Layer

Emits an event on the instance. This method should only be used when creating subclasses of this class.

Parameters

type String

The name of the event.

event Object

optional

The event payload.

Returns

Type	Description
Boolean	`true` if a listener was notified

fetchAttributionData Inherited Method fetchAttributionData(){Promise<Object>} Inherited from Layer

Fetches custom attribution data for the layer when it becomes available.

Returns

Type	Description
Promise<Object>	Resolves to an object containing custom attribution data for the layer.

findSublayerForFeature Method findSublayerForFeature(feature){SubtypeSublayer} Since: ArcGIS Maps SDK for JavaScript 4.27 SubtypeGroupLayer since 4.20, findSublayerForFeature added at 4.27.

Returns the sublayer to which the given feature belongs.

Parameter

feature Graphic

The feature whose sublayer will be returned.

Returns

Type	Description
SubtypeSublayer	The sublayer from the `SubtypeGroupLayer` to which the feature belongs to.

findSublayerForSubtypeCode Method findSublayerForSubtypeCode(subtypeCode){SubtypeSublayer} Since: ArcGIS Maps SDK for JavaScript 4.27 SubtypeGroupLayer since 4.20, findSublayerForSubtypeCode added at 4.27.

Returns the sublayer with the subtypeCode that matches the number passed as an argument.

Parameter

subtypeCode Number

The subtype coded value.

Returns

Type	Description
SubtypeSublayer	The sublayer from the `SubtypeGroupLayer` to which the feature belongs to.

Example

// Updates the renderer of a sublayer after first finding
// the sublayer from the subtypeCode.
const subtypeCode = 5;
const subtypeSublayer = subtypeGroupLayer.findSublayerForSubtypeCode(subtypeCode);

subtypeSublayer.renderer = new SimpleMarkerSymbol({
  color: "#ffffff",
  size: 12,
  outline: {
    color: "#000000",
    width: 1
  }
});

getField Method getField(fieldName){Field}

Returns the Field instance for a field name (case-insensitive).

Parameter

fieldName String

Name of the field.

Returns

Type	Description
Field	the matching field or `undefined`

See also

fields

getFieldDomain Method getFieldDomain(fieldName, options){Domain}

Returns the Domain associated with the given field name. The domain can be either a CodedValueDomain or RangeDomain.

Parameters

fieldName String

Name of the field.

options Object

optional

An object specifying additional options. See the object specification table below for the required properties of this object.

Specification

feature Graphic

The feature to which the Domain is assigned.

Returns

Type	Description
Domain	The Domain object associated with the given field name for the given feature.

Example

// Get a range domain associated with the first feature
// returned from queryFeatures().
featureLayer.queryFeatures(query).then(function(results){
  const domain = featureLayer.getFieldDomain("Height", {feature: results.features[0]});
  console.log("domain", domain)
});

hasEventListener Inherited Method hasEventListener(type){Boolean} Inherited from Layer

Indicates whether there is an event listener on the instance that matches the provided event name.

Parameter

type String

The name of the event.

Returns

Type	Description
Boolean	Returns true if the class supports the input event.

hasHandles Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 4.25.

Returns true if a named group of handles exist.

Parameter

groupKey *

optional

A group key.

Returns

Type	Description
Boolean	Returns `true` if a named group of handles exist.

Example

// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

isFulfilled Inherited Method isFulfilled(){Boolean} Inherited from Layer

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected). If it is fulfilled, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been fulfilled (either resolved or rejected).

isRejected Inherited Method isRejected(){Boolean} Inherited from Layer

isRejected() may be used to verify if creating an instance of the class is rejected. If it is rejected, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been rejected.

isResolved Inherited Method isResolved(){Boolean} Inherited from Layer

isResolved() may be used to verify if creating an instance of the class is resolved. If it is resolved, true will be returned.

Returns

Type	Description
Boolean	Indicates whether creating an instance of the class has been resolved.

load Inherited Method load(signal){Promise} Inherited from Layer

Loads the resources referenced by this class. This method automatically executes for a View and all of the resources it references in Map if the view is constructed with a map instance.

This method must be called by the developer when accessing a resource that will not be loaded in a View.

The load() method only triggers the loading of the resource the first time it is called. The subsequent calls return the same promise.

It's possible to provide a signal to stop being interested into a Loadable instance load status. When the signal is aborted, the instance does not stop its loading process, only cancelLoad can abort it.

Parameter

signal AbortSignal

optional

Signal object that can be used to abort the asynchronous task. The returned promise will be rejected with an Error named AbortError when an abort is signaled. See also AbortController for more information on how to construct a controller that can be used to deliver abort signals.

Returns

Type	Description
Promise	Resolves when the resources have loaded.

loadAll Method loadAll(){Promise<Sublayer>}

Loads all of the sublayers. See loaded or loadStatus properties to check the status.

Returns

Type	Description
Promise<Sublayer>	Resolves when all the sublayers have been loaded. Rejects if one or more of the sublayers failed to load.

See also

load

Example

// Load all resources but ignore if one or more of them failed to load
subtypeGroupLayer.loadAll()
  .catch(function(error) {
    // Ignore any failed sublayers
  })
  .then(function() {
    console.log("All loaded");
  });

on Inherited Method on(type, listener){Object} Inherited from Layer

Registers an event handler on the instance. Call this method to hook an event with a listener.

Parameters

type String|String []

An event or an array of events to listen for.

listener Function

The function to call when the event fires.

Returns

Type Description

Object

Returns an event handler with a remove() method that should be called to stop listening for the event(s).

Property	Type	Description
remove	Function	When called, removes the listener from the event.

Example

view.on("click", function(event){
  // event is the event handle returned after the event fires.
  console.log(event.mapPoint);
});

queryAttachments Method queryAttachments(attachmentQuery, options){Promise<Object>}

Query information about attachments associated with features. It will return an error if the layer's capabilities.data.supportsAttachment property is false. Attachments for multiple features can be queried if the layer's capabilities.operations.supportsQueryAttachments is true.

Known Limitations

When the layer'scapabilities.operations.supportsQueryAttachments property is false, AttachmentQuery.objectIds property only accepts a single objectId.

Parameters

attachmentQuery AttachmentQuery autocast

Autocasts from Object

Specifies the attachment parameters for query.

options Object

optional

An object with the following properties.

Specification

signal AbortSignal

optional

Returns

Type	Description
Promise<Object>	When resolved, returns an object containing AttachmentInfos grouped by the source feature objectIds.

See also

capabilities.data.supportsAttachment
capabilities.operations.supportsQueryAttachments

Example

layer.when(function () {
  // queryObjectIds for all features within the layer
  layer.queryObjectIds().then(function (objectIds) {
    // Define parameters for querying attachments,
    // query features where objectIds are less than 735,
    // and only query jpeg attachments for these features.
    let attachmentQuery = {
      objectIds: objectIds,
      definitionExpression: "OBJECTID < 735",
      attachmentTypes: ["image/jpeg"]
    };

    // Only pass in one objectId for attachmentQuery.objectIds
    // if the layer's capabilities.operations.supportsQueryAttachments is false
    layer.queryAttachments(attachmentQuery).then(function (attachments) {
      // Print out all returned attachment infos to the console.
      attachmentQuery.objectIds.forEach(function (objectId) {
        if (attachments[objectId]) {
          let attachment = attachments[objectId];
          console.group("attachment for", objectId);
          attachment.forEach(function (item) {
            console.log("attachment id", item.id);
            console.log("content type", item.contentType);
            console.log("name", item.name);
            console.log("size", item.size);
            console.log("url", item.url);
            console.groupEnd();
          });
        }
      });
    })
    .catch(function (error) {
      console.log("attachment query error", error);
    })
  });
});

queryExtent Method queryExtent(query, options){Promise<Object>}

Executes a Query against the feature service and returns the Extent of features that satisfy the query. If no parameters are specified, then the extent and count of all features satisfying the layer's configuration/filters are returned. This is valid only for hosted feature services on arcgis.com and for ArcGIS Server 10.3.1 and later.

To query for the extent of features/graphics available to or visible in the View on the client rather than making a server-side query, you must use the SubtypeGroupLayerView.queryExtent() method.

Parameters

query Query autocast

optional

Autocasts from Object

Specifies the attributes and spatial filter of the query. If no parameters are specified, then the extent and count of all features satisfying the layer's configuration/filters are returned.

options Object

optional

An object with the following properties.

Specification

signal AbortSignal

optional

Returns

Type

Description

Promise<Object>

When resolved, returns the extent and count of the features that satisfy the input query. See the object specification table below for details.

Property	Type	Description
count	Number	The number of features that satisfy the input query.
extent	Extent \| null	The extent of the features that satisfy the query.

Examples

// Queries for the extent of all features matching the layer's configurations
// e.g. definitionExpression
layer.queryExtent().then(function(results){
  // go to the extent of the results satisfying the query
  view.goTo(results.extent);
});

const layer = new SubtypeGroupLayer({
  url: fsUrl  // points to a Feature Service layer url
});

const query = new Query();
query.where = "region = 'Southern California'";

layer.queryExtent(query).then(function(results){
  view.goTo(results.extent);  // go to the extent of the results satisfying the query
});

queryFeatureCount Method queryFeatureCount(query, options){Promise<Number>}

Executes a Query against the feature service and returns the number of features that satisfy the query. If no parameters are specified, the total number of features satisfying the layer's configuration/filters is returned.

To query for the count of features/graphics available to or visible in the View on the client rather than making a server-side query, you must use the SubtypeGroupLayerView.queryFeatureCount() method.

Parameters

query Query autocast

optional

Autocasts from Object

Specifies the attributes and spatial filter of the query. If no parameters are specified, the total number of features satisfying the layer's configuration/filters is returned.

options Object

optional

An object with the following properties.

Specification

signal AbortSignal

optional

Returns

Type	Description
Promise<Number>	When resolved, returns the number of features that satisfy the query.

Examples

// Queries for the count of all features matching the layer's configurations
// e.g. definitionExpression
layer.queryFeatureCount().then(function(numFeatures){
  // prints the total count to the console
  console.log(numFeatures);
});

const layer = new SubtypeGroupLayer({
  url: fsUrl  // points to a Feature Service layer url
});

const query = new Query();
query.where = "region = 'Southern California'";

layer.queryFeatureCount(query).then(function(numResults){
  console.log(numResults);  // prints the number of results satisfying the query
});

queryFeatures Method queryFeatures(query, options){Promise<FeatureSet>}

Executes a Query against the feature service and returns a FeatureSet, which can be accessed using the .then() method once the promise resolves. A FeatureSet contains an array of Graphic features. See the querying section for more information on how to query features from a layer.

To query features/graphics available to or visible in the View on the client rather than making a server-side query, you must use the SubtypeGroupLayerView.queryFeatures() method.

When querying a service with z-values and no vertical coordinate system information, the z-values will automatically be converted to match the outSpatialReference units. Example: The service has a horizontal spatial reference using feet units and the query is made with outSpatialReference based on meter units, then queryFeatures() automatically converts the values from feet to meter units.

Parameters

query Query autocast

optional

Autocasts from Object

Specifies the attributes and spatial filter of the query. If no parameters are specified, then all features satisfying the layer's configuration/filters are returned.

options Object

optional

An object with the following properties.

Specification

signal AbortSignal

optional

Returns

Type	Description
Promise<FeatureSet>	When resolved, a FeatureSet containing an array of graphic features is returned.

See also

Examples

// Queries for all the features matching the layer's configurations
// e.g. definitionExpression
layer.queryFeatures().then(function(results){
  // prints the array of result graphics to the console
  console.log(results.features);
});

const layer = new SubtypeGroupLayer({
  url: fsUrl  // points to a Feature Service layer url
});

const query = new Query();
query.where = "STATE_NAME = 'Washington'";
query.outSpatialReference = { wkid: 102100 };
query.returnGeometry = true;
query.outFields = [ "CITY_NAME" ];

layer.queryFeatures(query).then(function(results){
  console.log(results.features);  // prints the array of features to the console
});

// Get a query object for the layer's current configuration
const queryParams = layer.createQuery();
// set a geometry for filtering features by a region of interest
queryParams.geometry = extentForRegionOfInterest;
// Add to the layer's current definitionExpression
queryParams.where = queryParams.where + " AND TYPE = 'Extreme'";

// query the layer with the modified params object
layer.queryFeatures(queryParams).then(function(results){
  // prints the array of result graphics to the console
  console.log(results.features);
});

const layer = new SubtypeGroupLayer({
  url: fsUrl  // points to a Feature Service layer url
});

// query all features from the layer and only return
// attributes specified in outFields.
const query = { // autocasts as Query
  where: "1=1", // select all features
  returnGeometry: false,
  outFields: ["State_Name", "City_Name", "pop2010"]
};

layer.queryFeatures(query).then(function(results){
  console.log(results.features);  // prints the array of features to the console
});

queryObjectIds Method queryObjectIds(query, options){Promise<Number[]>}

Executes a Query against the feature service and returns an array of Object IDs for features that satisfy the input query. If no parameters are specified, then the Object IDs of all features satisfying the layer's configuration/filters are returned.

To query for ObjectIDs of features/graphics available to or visible in the View on the client rather than making a server-side query, you must use the SubtypeGroupLayerView.queryObjectIds() method.

Parameters

query Query autocast

optional

Autocasts from Object

Specifies the attributes and spatial filter of the query. If no parameters are specified, then the Object IDs of all features satisfying the layer's configuration/filters are returned.

options Object

optional

An object with the following properties.

Specification

signal AbortSignal

optional

Returns

Type	Description
Promise<Number []>	When resolved, returns an array of numbers representing the object IDs of the features satisfying the query.

Examples

// Queries for all the Object IDs of features matching the layer's configurations
// e.g. definitionExpression
layer.queryObjectIds().then(function(results){
  // prints the array of Object IDs to the console
  console.log(results);
});

const layer = new SubtypeGroupLayer({
  url: fsUrl  // points to a Feature Service layer url
});

const query = new Query();
query.where = "region = 'Southern California'";

layer.queryObjectIds(query).then(function(ids){
  console.log(ids);  // an array of object IDs
});

queryRelatedFeatures Method queryRelatedFeatures(relationshipQuery, options){Promise<Object>}

Executes a RelationshipQuery against the feature service and returns FeatureSets grouped by source layer or table objectIds.

Parameters

relationshipQuery RelationshipQuery autocast

Autocasts from Object

Specifies relationship parameters for querying related features or records from a layer or a table.

options Object

optional

An object with the following properties.

Specification

signal AbortSignal

optional

Returns

Type	Description
Promise<Object>	When resolved, returns FeatureSets grouped by source layer/table objectIds. Each FeatureSet contains an array of Graphic features including the values of the fields requested by the user.

See also

Example

const objectIds = [385, 416];

// relationship query parameter
const query = {
  outFields: ["*"],
  relationshipId: relationshipId,
  objectIds: objectIds
}

// query related features for given objectIds
layer.queryRelatedFeatures(query).then(function (result) {
  objectIds.forEach(function (objectId) {
    // print out the attributes of related features if the result
    // is returned for the specified objectId
    if (result[objectId]) {
      console.group("relationship for feature:", objectId)
      result[objectId].features.forEach(function (feature) {
        console.log("attributes", JSON.stringify(feature.attributes));
      });
      console.groupEnd();
    }
  });
}).catch(function (error) {
  console.log("error from queryRelatedFeatures", error);
});

queryRelatedFeaturesCount Method queryRelatedFeaturesCount(relationshipQuery, options){Promise<Object>}

Executes a RelationshipQuery against the feature service and when resolved, it returns an object containing key value pairs. Key in this case is the objectId of the feature and value is the number of related features associated with the feature.

Parameters

relationshipQuery RelationshipQuery autocast

Autocasts from Object

Specifies relationship parameters for querying related features or records from a layer or a table.

options Object

optional

An object with the following properties.

Specification

signal AbortSignal

optional

Returns

Type	Description
Promise<Object>	When resolved, returns an object containing key value pairs. Key in this case is the `objectId` of the feature and value is the number of related features.

See also

Example

const objectIds = [385, 416];

// relationship query parameter
const query = {
  outFields: ["*"],
  relationshipId: relationshipId,
  objectIds: objectIds
}

// query related features for given objectIds
layer.queryRelatedFeaturesCount(query).then(function (count) {
  console.log("queryRelatedFeaturesCount", count);
  // this will print out
  // {385: 91, 416: 23}
}).catch(function (error) {
  console.log("error from queryRelatedFeatures", error);
});

refresh Method refresh()

Fetches all the data for the layer.

See also

refreshInterval
refresh event

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 4.25.

Removes a group of handles owned by the object.

Parameter

groupKey *

optional

A group key or an array or collection of group keys to remove.

Example

obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

save Method save(options){Promise<PortalItem>} Since: ArcGIS Maps SDK for JavaScript 4.24 SubtypeGroupLayer since 4.20, save added at 4.24.

Saves the layer to its existing portal item in the Portal authenticated within the user's current session. If the layer is not saved to a PortalItem, then you should use saveAs.

Known Limitations

You can only save service-backed FeatureLayers. Client-side layers cannot be saved.

Parameters

Specification

options Object

optional

Various options for saving the layer.

Specification

validationOptions Object

optional

Options for validating the save operation.

Specification

ignoreUnsupported Boolean

optional

Indicates whether to ignore saving unsupported layers or layers with unsupported content, such as unsupported symbology.

Returns

Type	Description
Promise<PortalItem>	When resolved, returns the portal item to which the layer is saved.

Example

const portalItem = await layer.save();

saveAs Method saveAs(portalItem, options){Promise<PortalItem>} Since: ArcGIS Maps SDK for JavaScript 4.24 SubtypeGroupLayer since 4.20, saveAs added at 4.24.

Saves the layer to a new portal item in the Portal authenticated within the user's current session.

Known Limitations

You can only save service-backed FeatureLayers. Client-side layers cannot be saved.

Parameters

Specification

portalItem PortalItem autocast

Autocasts from Object

The portal item to which the layer will be saved.

options Object

optional

Various options for saving the layer.

Specification

folder PortalFolder

optional

The portal folder where the layer's portal item will be saved.

validationOptions Object

optional

Options for validating the save operation.

Specification

ignoreUnsupported Boolean

optional

Indicates whether to ignore saving unsupported layers or layers with unsupported content, such as unsupported symbology.

Returns

Type	Description
Promise<PortalItem>	When resolved, returns the portal item to which the layer is saved.

Example

const portalItem = new PortalItem();
await layer.saveAs(portalItem);

updateAttachment Method updateAttachment(feature, attachmentId, attachment){Promise<FeatureEditResult>}

Updates an existing attachment for a feature. This operation is available only if the layer's capabilities.data.supportsAttachment is set to true.

Parameters

feature Graphic

The feature containing the attachment to be updated.

attachmentId Number

Id of the attachment to be updated.

attachment HTMLFormElement|FormData

HTML form that contains a file upload field pointing to the file to be added as an attachment.

Returns

Type	Description
Promise<FeatureEditResult>	When resolved, a FeatureEditResult object is returned. FeatureEditResult indicates whether or not the edit was successful. If successful, the `objectId` of the result is the Id of the new attachment. If unsuccessful, it also includes an error `name` and error `message`.

See also

capabilities.data.supportsAttachment

when Inherited Method when(callback, errback){Promise} Inherited from Layer

when() may be leveraged once an instance of the class is created. This method takes two input parameters: a callback function and an errback function. The callback executes when the instance of the class loads. The errback executes if the instance of the class fails to load.

Parameters

callback Function

optional

The function to call when the promise resolves.

errback Function

optional

The function to execute when the promise fails.

Returns

Type	Description
Promise	Returns a new promise for the result of `callback` that may be used to chain additional functions.

Example

// Although this example uses MapView, any class instance that is a promise may use when() in the same way
let view = new MapView();
view.when(function(){
  // This function will execute once the promise is resolved
}, function(error){
  // This function will execute if the promise is rejected due to an error
});

Event Overview

Show inherited events

Hide inherited events

Type	Summary	Class
{addedFeatures: FeatureEditResult [],deletedFeatures: FeatureEditResult [],updatedFeatures: FeatureEditResult [],addedAttachments: FeatureEditResult [],deletedAttachments: FeatureEditResult [],updatedAttachments: FeatureEditResult []}	Fires after applyEdits() is completed successfully.	SubtypeGroupLayer
{view: View,layerView: LayerView}	Fires after the layer's LayerView is created and rendered in a view.	Layer
{view: View,error: Error}	Fires when an error emits during the creation of a LayerView after a layer has been added to the map.	Layer
{view: View,layerView: LayerView}	Fires after the layer's LayerView is destroyed and no longer renders in a view.	Layer
{dataChanged: Boolean}	Fires if the layer has the refreshInterval set or when refresh() method is called.	SubtypeGroupLayer

Event Details

edits Event edits

Fires after applyEdits() is completed successfully. The event payload includes only successful edits, not the failed edits.

Properties

addedFeatures FeatureEditResult []

An array of successfully added features.

deletedFeatures FeatureEditResult []

An array of successfully deleted features.

updatedFeatures FeatureEditResult []

An array of successfully updated features.

addedAttachments FeatureEditResult []

An array of successfully added attachments.

deletedAttachments FeatureEditResult []

An array of successfully deleted attachments.

updatedAttachments FeatureEditResult []

An array of successfully updated attachments.

See also

applyEdits()

Example

// This function will fire each time applyEdits() is completed successfully
subtypeGroupLayer.on("edits", function(event) {

  const extractObjectId = function(result) {
    return result.objectId;
  };

  const adds = event.addedFeatures.map(extractObjectId);
  console.log("addedFeatures: ", adds.length, adds);

  const updates = event.updatedFeatures.map(extractObjectId);
  console.log("updatedFeatures: ", updates.length, updates);

  const deletes = event.deletedFeatures.map(extractObjectId);
  console.log("deletedFeatures: ", deletes.length, deletes);
});

layerview-create Inherited Event layerview-create Inherited from Layer

Fires after the layer's LayerView is created and rendered in a view.

Properties

view View

The view in which the layerView was created.

layerView LayerView

The LayerView rendered in the view representing the layer in layer.

See also

View.whenLayerView()

Example

// This function will fire each time a layer view is created for this
// particular view.
layer.on("layerview-create", function(event){
  // The LayerView for the layer that emitted this event
  event.layerView;
});

layerview-create-error Inherited Event layerview-create-error Inherited from Layer

Fires when an error emits during the creation of a LayerView after a layer has been added to the map.

Properties

view View

The view that failed to create a layerview for the layer emitting this event.

error Error

An error object describing why the layer view failed to create.

See also

View.whenLayerView()

Example

// This function fires when an error occurs during the creation of the layer's layerview
layer.on("layerview-create-error", function(event) {
  console.error("LayerView failed to create for layer with the id: ", layer.id, " in this view: ", event.view);
});

layerview-destroy Inherited Event layerview-destroy Inherited from Layer

Fires after the layer's LayerView is destroyed and no longer renders in a view.

Properties: view View

The view in which the layerView was destroyed.

layerView LayerView

The destroyed LayerView representing the layer.

refresh Event refresh Since: ArcGIS Maps SDK for JavaScript 4.21 SubtypeGroupLayer since 4.20, refresh added at 4.21.

Fires if the layer has the refreshInterval set or when refresh() method is called. The event payload indicates if the layer's data has changed.

Property

dataChanged Boolean

Indicates if the layer's data has changed.

See also

refreshInterval
refresh()

Example

// listen to layer's refresh event to fetch the attachments
// for the updated features.
layer.on("refresh", function(event){
  if (event.dataChanged){
    const query = layer.createQuery();
    layer.queryObjectIds(query).then(function (objectIds) {
      let attachmentQuery = {
        objectIds: objectIds,
        definitionExpression: layer.definitionExpression,
        attachmentTypes: ["image/jpeg"]
      };
      layer.queryAttachments(attachmentQuery).then(function (attachments) {
        attachmentQuery.objectIds.forEach(function (objectId) {
          if (attachments[objectId]) {
            // process the updated attachments
            let attachment = attachments[objectId];
          }
        });
      })
      .catch(function (error) {
        console.log("attachment query error", error);
      });
    });
  }
});