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OGCFeatureLayer

require(["esri/layers/OGCFeatureLayer"], function(OGCFeatureLayer) { /* code goes here */ });
Class: esri/layers/OGCFeatureLayer
Inheritance: OGCFeatureLayer Layer Accessor
Since: ArcGIS API for JavaScript 4.16

The OGCFeatureLayer class is used to create a layer based on individual collections from a OGC API Features service.

The following snippet shows how to add a new OGCFeatureLayer to the map. The url and collectionId must be specified in order for the layer to be loaded properly.

// Add the "countries" collection from an OGC API Feature server.
const countries = new OGCFeatureLayer({
    url: "https://vtp2.geo-solutions.it/geoserver/ogc/features",
    collectionId: "ne:countries50m"
});
map.add(countries);

Known Limitations

  • OGCFeatureLayer only supports collection items encoded in GeoJSON. A layer will not load if the server's conformance declaration does not include GeoJSON support. For a detailed explaination on Esri's support for GeoJSON consult documentation for GeoJSONLayer.
  • Collections with numeric GeoJSON feature ids are preferred. String or alphanumeric ids are supported with limited capabilities, for example, popups will not be available.
See also:

Constructors

new OGCFeatureLayer(properties)
Parameter:
properties Object
optional

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

Example:
// Add a new OGC Feature Layer to a map.
const layer = new OGCFeatureLayer({
  url: "https://demo.pygeoapi.io/stable",
  collectionId: "dutch_windmills"
});
const map = new Map();
map.add(layer);

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
NameTypeSummaryClass
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.

more details
more detailsLayer
String

The unique identifier of the collection on the server.

more details
more detailsOGCFeatureLayer
String

Copyright information for the layer.

more details
more detailsOGCFeatureLayer
String

The name of the class.

more details
more detailsAccessor
String

Description of the features in the collection.

more details
more detailsOGCFeatureLayer
String

The name of the layer's primary display field.

more details
more detailsOGCFeatureLayer
Object

Specifies how graphics are placed on the vertical axis (z).

more details
more detailsOGCFeatureLayer
FeatureReductionCluster|FeatureReductionSelection

Configures the method for reducing the number of point features in the view.

more details
more detailsOGCFeatureLayer
Field[]

An array of fields in the layer.

more details
more detailsOGCFeatureLayer
FieldsIndex

A convenient property that can be used to make case-insensitive lookups for a field by name.

more details
more detailsOGCFeatureLayer
Extent

The full extent of the layer.

more details
more detailsLayer
String

The geometry type of features in the layer.

more details
more detailsOGCFeatureLayer
String

The unique ID assigned to the layer.

more details
more detailsLayer
LabelClass[]

The label definition for this layer, specified as an array of LabelClass.

more details
more detailsOGCFeatureLayer
Boolean

Indicates whether to display labels for this layer.

more details
more detailsOGCFeatureLayer
Boolean

Indicates whether the layer will be included in the legend.

more details
more detailsOGCFeatureLayer
String

Indicates how the layer should display in the LayerList widget.

more details
more detailsLayer
Boolean

Indicates whether the layer's resources have loaded.

more details
more detailsLayer
Error

The Error object returned if an error occurred while loading.

more details
more detailsLayer
String

Represents the status of a load operation.

more details
more detailsLayer
Object[]

A list of warnings which occurred while loading.

more details
more detailsLayer
Number

The maximum scale (most zoomed in) at which the layer is visible in the view.

more details
more detailsOGCFeatureLayer
String

The url query string in the format request json content from the server.

more details
more detailsOGCFeatureLayer
Number

The minimum scale (most zoomed out) at which the layer is visible in the view.

more details
more detailsOGCFeatureLayer
String

The OGCFeatureLayer requires that each feature be uniquely identified with an object id.

more details
more detailsOGCFeatureLayer
Number

The opacity of the layer.

more details
more detailsLayer
Boolean

Indicates whether to display popups when features in the layer are clicked.

more details
more detailsOGCFeatureLayer
PopupTemplate

The popup template for the layer.

more details
more detailsOGCFeatureLayer
Number

Refresh interval of the layer in minutes.

more details
more detailsOGCFeatureLayer
Renderer

The renderer assigned to the layer.

more details
more detailsOGCFeatureLayer
SpatialReference

The spatial reference of the layer.

more details
more detailsOGCFeatureLayer
String

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

more details
more detailsOGCFeatureLayer
StringFor OGCFeatureLayer the type is always "ogc-feature". more detailsmore detailsOGCFeatureLayer
String

The URL to the server.

more details
more detailsOGCFeatureLayer
Boolean

Indicates if the layer is visible in the View.

more details
more detailsLayer

Property Details

blendMode String inherited

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 a new layer.

color-blend

Known 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 modeDescription
normalThe top layer is displayed over the background layer. The data of the top layer block the data of background layer where they overlap.
averageTakes 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 modeDescription
lightenCompares top and background layers and retains the lighter color in the top layer. 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.
lighterColors 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.
plusColors 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.
screenInverts colors of the background layer and multiplies with colors of the top layer. 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-dodgeCreates a brighter effect by decreasing the contrast between the top and background layers, resulting in saturated mid-tones and bright 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 modeDescription
darkenEmphasizes 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.
multiplyEmphasizes 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-burnIntensifies 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 modeOverlay blend mode
no-blendmodeoverlay-blend
Blend modeDescription
overlayUses 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-lightApplies a half strength screen mode to lighter areas and 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-lightMultiplies 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-lightUses 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.

color-blend

Blend modeDescription
hueCreates an effect with the hue of the top layer and the luminosity and saturation of the background layer.
saturationCreates 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.
luminosityCreates 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.
colorCreates 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).

destination-in

Blend modeDescription
destination-overDestination/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-atopDestination/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-inDestination/background layer is drawn only where it overlaps with the top layer. Everything else is made transparent.
destination-outDestination/background layer is drawn where it doesn't overlap the top layer. Everything else is made transparent.
source-atopSource/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-inSource/top layer is drawn only where it overlaps with the background layer. Everything else is made transparent.
source-outSource/top layer is drawn where it doesn't overlap the background layer. Everything else is made transparent.
xorTop 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.

color-blend

Blend modeDescription
differenceSubtracts 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.
exclusionSimilar 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.
minusSubtracts 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.
invertInverts the background colors wherever the top and background layers overlap. The invert blend mode inverts the layer similar to a photographic negative.
reflectThis 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.

Possible Values:"average"|"color-burn"|"color-dodge"|"color"|"darken"|"destination-atop"|"destination-in"|"destination-out"|"destination-over"|"difference"|"exclusion"|"hard-light"|"hue"|"invert"|"lighten"|"lighter"|"luminosity"|"minus"|"multiply"|"normal"|"overlay"|"plus"|"reflect"|"saturation"|"screen"|"soft-light"|"source-atop"|"source-in"|"source-out"|"vivid-light"|"xor"

Default Value:normal
See also:
collectionId String

The unique identifier of the collection on the server. Identifiers can be discovered by browsing the html representation of the OGC API Feature landing page.

Example:
// Create a layer from the "topp:states" collection.
const ogcFeatureLayer = new OGCFeatureLayer({
  url: "http://myserver/geoserver/ogc/features",
  collectionId: "topp:states"
});

Copyright information for the layer.

declaredClass Stringreadonly inherited

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

description Stringreadonly

Description of the features in the collection.

Example:
// Display the description of the layer.
const ogcFeatureLayer = new OGCFeatureLayer({
  url: "http://cloudsdi.geo-solutions.it/geoserver/wfs3",
  collectionId: "topp:states"
});
ogcFeatureLayer.then(function(){
  const description = ogcFeatureLayer.description;
  console.log(description ? description : "No description available");
});
displayField String

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.

elevationInfo Object

Specifies how graphics 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.

Properties:
mode String

Defines how the graphic is placed with respect to the terrain surface. See the table below for a list of possible values.

ModeDescription
on-the-groundGraphics are draped on the terrain surface. This is the default value for Point geometries rendered with ObjectSymbol3DLayers.
relative-to-groundGraphics are placed at an elevation relative to the terrain surface. The graphic's elevation is determined by summing up the terrain elevation and the result of featureExpressionInfo (if defined). This is the default value for Point geometries rendered with IconSymbol3DLayers.
absolute-heightGraphics are placed at an absolute elevation (z-value) above sea level. This z-value is determined by the result of featureExpressionInfo (if defined). This mode doesn't take the elevation of the terrain into account.
relative-to-sceneFeatures are aligned to extruded polygons and objects part of 3D Object SceneLayers or IntegratedMeshLayers, depending on which has higher elevation. If the graphic is not directly above a building or any other feature, it is aligned to the terrain surface elevation. If defined, the result of featureExpressionInfo is added to the 3D Object/terrain surface elevation.

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

offset Number
optional

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

featureExpressionInfo Object
optional

This object contains information about setting a custom z-value on the feature.

Specification:
expression String
optional

An Arcade expression evaluating to a number that determines 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 String
optional

The unit for featureExpressionInfo and offset values.

Possible Values:"feet"|"meters"|"kilometers"|"miles"|"us-feet"|"yards"

Configures the method for reducing the number of point features in the view. By default this property is null, which indicates the layer view should draw every feature.

There are two types of feature reduction: selection and cluster.

  • Selection only applies to points in a SceneView and involves thinning overlapping features so no features intersect on screen.
  • FeatureReductionCluster spatially groups points in a MapView into clusters. The size of each cluster is proportional to the number of features within the cluster.
See also:
Examples:
// clusters points based on their spatial proximity to other points
layer.featureReduction = {
  type: "cluster",
  clusterRadius: 100
};
// thins features in the view
layer.featureReduction = {
  type: "selection"
};
Autocasts from Object[]

An array of fields in the layer.

fieldsIndex FieldsIndexreadonly

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. The seatch ignores case.
const field = layer.fieldsIndex.get("SoMeFiEld");

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

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;
});
geometryType String

The geometry type of features in the layer. All features must be of the same type.

Possible Values:"point"|"polygon"|"polyline"|"multipoint"

Example:
// Create a new polygon OGC Feature Layer
const ogcFeatureLayer = new OGCFeatureLayer({
  url: "http://myserver/geoserver/ogc/features",
  collectionId: "topp:states",
  geometryType: "polygon"
});

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

Autocasts from Object[]

The label definition for this layer, specified as an array of LabelClass. Use this property to specify labeling properties for the layer such as label expression, placement, and size.

Multiple Label classes with different where clauses can be used to define several labels with varying styles on the same feature. Likewise, multiple label classes may be used to label different types of features (for example blue labels for lakes and green labels for parks).

Known Limitations

See also:
Example:
ogcFeatureLayer.labelingInfo = [
  new LabelClass({
    labelExpressionInfo: {
      expression: "$feature.NAME"
    },
    symbol: {
      type: "text",
      color: "black",
      haloSize: 1,
      haloColor: "white"
    }
  })
];
labelsVisible Boolean

Indicates whether to display labels for this layer. If true, labels will appear as defined in the labelingInfo property.

Known Limitations

Default Value:true
legendEnabled Boolean

Indicates whether the layer will be included in the legend.

Default Value:true
listMode String inherited

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

ValueDescription
showThe layer is visible in the table of contents.
hideThe layer is hidden in the table of contents.
hide-childrenIf 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
loaded Booleanreadonly inherited

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

Default Value:false
loadError Errorreadonly inherited

The Error object returned if an error occurred while loading.

Default Value:null
loadStatus Stringreadonly inherited

Represents the status of a load operation.

ValueDescription
not-loadedThe object's resources have not loaded.
loadingThe object's resources are currently loading.
loadedThe object's resources have loaded without errors.
failedThe object's resources failed to load. See loadError for more details.

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

Default Value:not-loaded
loadWarnings Object[]readonly inherited

A list of warnings which occurred while loading.

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;
mediaType String

The url query string in the format request json content from the server.

The mediaType property is only used for metadata requests like the land page, collections, and collections metadata. By default this is “application/json”, But some servers only support “json”.

When the client is requesting spatial data (as GeoJSON), it will always use the the “application/geo+json” format string.

Default Value:"application/json"
Example:
// Change the format suffice to "json".
const ogcFeatureLayer = new OGCFeatureLayer({
  url: "http://myserver/geoserver/ogc/features",
  collectionId: "topp:states",
  mediaType: "json"
});
await ogcFeatureLayer.load();

// The layer will make request following requests to the server.
// `http://myserver/geoserver/ogc/features?f=json` _Server landing page_
// `http://myserver/geoserver/ogc/features/conformance?f=json` _Server conformance information_
// `http://myserver/geoserver/ogc/features/collections/topp:states?f=json` _Collection information_
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 String

The OGCFeatureLayer requires that each feature be uniquely identified with an object id. By default, the OGCFeatureLayer will use the GeoJSON feature id for object ids. The name of the object id field will be OBJECTID.

The layer will not load if the GeoJSON feature id is missing. If the GeoJSON feature id is not numeric then some capabilities of the layer, such as popups, will not be available.

If GeoJSON feature id is missing or non-numeric then you can specify an existing property (if any) to be the object id field with the objectIdField property. In the example below, the ids for country collection below are as follows "countries50m.1" and "countries50m.2". In this case, we want to specify the objectIdField as WOE_ID, because it is a reference to the numeric "where on Earth id" for each country.

Lastly, if there is not a default object id in the GeoJSON and the objectIdField is not specified, then an ObjectID field will be generated for each feature.

Default Value:null
See also:
Example:
// Create a new OGC Feature Layer using the existing GeoJSON field "WOE_ID" as the object id.
const countries = new OGCFeatureLayer({
  url: "https://vtp2.geo-solutions.it/geoserver/ogc/features",
  collectionId: "ne:countries50m",
  objectIdField: "WOE_ID" // uses the "where on earth id" numeric field
});

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;
popupEnabled Boolean

Indicates whether to display popups when features in the layer are clicked. The layer needs to have a popupTemplate to define what information should be displayed in the popup. Alternatively, a default popup template may be automatically used if Popup.defaultPopupTemplateEnabled is set to true.

Default Value:true
See also:
popupTemplate PopupTemplateautocast

The popup template for the layer. When set on the layer, the popupTemplate allows users to access attributes and display their values in the view's popup when a feature is selected using text and/or charts. See the PopupTemplate sample for an example of how PopupTemplate interacts with a FeatureLayer.

A default popup template is automatically used if no popupTemplate has been defined when Popup.defaultPopupTemplateEnabled is set to true.

See also:
refreshInterval Number

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

Default Value:0
Example:
// the layer will be refreshed every 6 seconds.
layer.refreshInterval = 0.1;

The renderer assigned to the layer. The renderer defines how to visualize each feature in the layer. Depending on the renderer type, features may be visualized with the same symbol, or with varying symbols based on the values of provided attribute fields or functions. If not specified, a default renderer will be generated based on the geometry type.

spatialReference SpatialReferencereadonly

The spatial reference of the layer. OGC API Feature services only support WGS84.

Default Value:SpatialReference.WGS84
See also:
title String

The title of the layer used to identify it in places such as the Legend and LayerList widgets. If unspecified, the title will be the title associated with the OGC feature layer.

Example:
// Display the title of the layer.
const ogcFeatureLayer = new OGCFeatureLayer({
  url: "http://myserver/geoserver/ogc/features",
  collectionId: "topp:states"
});
ogcFeatureLayer.then(function(){
  const title = ogcFeatureLayer.title;
  console.log(title ? title : "No title available");
  // output: "california Band 3 mosaic indexes"
});
type Stringreadonly

For OGCFeatureLayer the type is always "ogc-feature".

url String

The URL to the server.

Example:
// Add the "topp:states" OGC feature collection to a map.
const ogcFeatureLayer = new OGCFeatureLayer({
  url: "http://myserver/geoserver/ogc/features",
  collectionId: "topp:states"
});
const view = new MapView({
  container: "viewDiv",
  map = new Map({
    basemap: "street",
    layers: [ogcFeatureLayer]
  })
});

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;

Method Overview

NameReturn TypeSummaryClass

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

more details
more detailsLayer
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.

more details
more detailsLayer
PopupTemplate

Creates a popup template for the layer, populated with all the fields of the layer.

more details
more detailsOGCFeatureLayer
Boolean

Emits an event on the instance.

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more detailsLayer
Promise<Object>

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

more details
more detailsLayer
Field

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

more details
more detailsOGCFeatureLayer
Boolean

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

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more detailsLayer
Boolean

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).

more details
more detailsLayer
Boolean

isRejected() may be used to verify if creating an instance of the class is rejected.

more details
more detailsLayer
Boolean

isResolved() may be used to verify if creating an instance of the class is resolved.

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more detailsLayer
Promise

Loads the resources referenced by this class.

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more detailsLayer
Object

Registers an event handler on the instance.

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more detailsLayer

Fetches all the data for the layer.

more details
more detailsOGCFeatureLayer
Promise

when() may be leveraged once an instance of the class is created.

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more detailsLayer

Method Details

cancelLoad()inherited

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

createLayerView(view, options){Promise<LayerView>}inherited

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:
optional

A signal to abort the creation of the layerview.

Returns:
TypeDescription
Promise<LayerView>Resolves with a LayerView instance.
See also:
createPopupTemplate(options){PopupTemplate}

Creates a popup template for the layer, populated with all the fields of the layer.

Parameter:
optional

Options for creating the popup template.

Returns:
TypeDescription
PopupTemplateThe popup template, or null if the layer does not have any fields.
emit(type, event){Boolean}inherited

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:
TypeDescription
Booleantrue if a listener was notified
fetchAttributionData(){Promise<Object>}inherited

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

Returns:
TypeDescription
Promise<Object>Resolves to an object containing custom attribution data for the layer.
getField(fieldName){Field}

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

Parameter:
fieldName String

Name of the field.

Returns:
TypeDescription
Fieldthe matching field or undefined
See also:
hasEventListener(type){Boolean}inherited

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:
TypeDescription
BooleanReturns true if the class supports the input event.
isFulfilled(){Boolean}inherited

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:
TypeDescription
BooleanIndicates whether creating an instance of the class has been fulfilled (either resolved or rejected).
isRejected(){Boolean}inherited

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

Returns:
TypeDescription
BooleanIndicates whether creating an instance of the class has been rejected.
isResolved(){Boolean}inherited

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

Returns:
TypeDescription
BooleanIndicates whether creating an instance of the class has been resolved.
load(signal){Promise}inherited

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.

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:
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:
TypeDescription
PromiseResolves when the resources have loaded.
on(type, listener){Object}inherited

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

Parameters:

A event type, or an array of event types, to listen for.

listener Function

The function to call when the event is fired.

Returns:
TypeDescription
ObjectReturns an event handler with a remove() method that can be called to stop listening for the event(s).
PropertyTypeDescription
removeFunctionWhen 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);
});
refresh()

Fetches all the data for the layer.

when(callback, errback){Promise}inherited

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:
TypeDescription
PromiseReturns 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
var 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

NameTypeSummaryClass
{view: View,layerView: LayerView}

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

more details
more detailsLayer
{view: View,error: Error}

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

more details
more detailsLayer
{view: View,layerView: LayerView}

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

more details
more detailsLayer

Event Details

layerview-createinherited

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:
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-errorinherited

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:
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-destroyinherited

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.

API Reference search results

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