VoxelLayer

AMD: require(["esri/layers/VoxelLayer"], (VoxelLayer) => { /* code goes here */ });
ESM: import VoxelLayer from "@arcgis/core/layers/VoxelLayer.js";
Class: esri/layers/VoxelLayer
Inheritance: VoxelLayer Layer Accessor
Since: ArcGIS Maps SDK for JavaScript 4.22

Overview

A voxel layer represents multidimensional volumetric data. For example, atmospheric or oceanic data, geological underground models, or space-time cubes can be visualized as voxel layer. The VoxelLayer can be visualized in a SceneView with the viewingMode set to local.

Use voxel layers to explore spatial relationships with other content. For example, an underground model visualized as a voxel layer can be viewed together with buildings or subterrain utilities to evaluate the underground for planned construction or maintenance.

voxel-layer

Known Limitations

  • VoxelLayer requires the EXT_color_buffer_float extension.
  • Visualizing voxels with data type INT16 or UINT16 additionally requires the EXT_texture_norm16 extension, which is currently only supported by the Chrome browser.
  • Visualizing voxels with data type FLOAT32 additionally requires the OES_texture_float_linear extension.
  • For best performance, use Chrome browser and a dedicated graphics card.
  • Mobile support differs across devices. Voxel scene layers are not recommended for use on mobile.
  • Measurement widget for both distance and area allows you to choose a point in a voxel layer. However, the point selection and measurement may not be accurate.

Creating a VoxelLayer

From ArcGIS Pro, you can author a voxel layer and publish it as a Scene Service. Scene Services can be hosted on ArcGIS Online or ArcGIS Enterprise by uploading a Scene Layer Package (.slpk) or by sharing it from ArcGIS Pro.

The Scene Service is identified by a service URL or portal item ID and can be used to create an instance of a VoxelLayer.

Reference a service URL

To create a VoxelLayer instance from a service, you must set the url property to the REST endpoint of a VoxelLayer. For a layer to be visible in a view, it must be added to the Map.

const voxelLayer = new VoxelLayer({
   url: "https://tiles.arcgis.com/tiles/z2tnIkrLQ2BRzr6P/arcgis/rest/services/EMU_Caribbean_Voxel/SceneServer"
});
const map = new Map({
   layers: [voxelLayer],
   basemap: {
     baseLayers: [
       new VectorTileLayer({
         url: "https://basemaps.arcgis.com/arcgis/rest/services/OpenStreetMap_GCS_v2/VectorTileServer"
       })
     ]
   }
});

If the voxel service is requested from a different domain, a CORS enabled server or a proxy is required.

Reference an ArcGIS portal Item ID

You can also create a VoxelLayer from the portal item ID.

const voxelLayer = new VoxelLayer({
   portalItem: {
     id: "3a922ed0c7a8489ea4fbe8747ac560ba"
   },
});

Data Visualization

Voxel layers can be visualized as volumes or surfaces using the property renderMode. When set to surfaces, only isosurfaces and sections are displayed, whereas volume draws the full volume.

A voxel layer contains variables representing continuous or discrete data. For example, permeability could be defined as a continuous variable and soil type as a discrete variable. Voxel layer only visualizes one variable at a time. A VoxelVariable describes a single variable in the VoxelLayer. The currentVariableId controls which variable is being rendered.

You can define how a continuous or discrete variable can be rendered. You can apply a data filter to, modify the color scheme of, or add transparency to a continuous variable by using VoxelTransferFunctionStyle. For a discrete variable, you can modify the color and label by using uniqueValues.

A voxel layer can be visualized together with other layers, for example, an underground soil model as a voxel layer together with boreholes as a 3D Objects scene layer. You can apply minScale and maxScale to a voxel layer to control when you want the voxel layer to be visible, or not be visible so that you can focus on another layer. The visibility of the voxel layer is turned off and the layer is unloaded when the layer is out of range of the minScale and maxScale. The voxel layer is reloaded again once the layer is within range of the minScale and maxScale.

Exploring a Voxel Layer

Voxel layers often cover large areas. There are various capabilities you can use to explore the voxel layer in detail.

VoxelSlice

Use VoxelSlice to define an area of interest. You can slice a voxel layer vertically to show a smaller volume, or horizontally slice to reduce the voxel layer to a specific height.

It is possible to have multiple slices in a VoxelLayer by modifying the VoxelVolumeStyle's slices or by authoring slices in ArcGIS Pro before publishing the voxel layer as a scene service.

Slices modified using VoxelVolumeStyle's slices and the slices authored from ArcGIS Pro are persistent in the web scene or layer definition respectively.

Position, tilt and orientation of a VoxelSlice can be modified with real-time rendering updates.

voxellayer_voxelslice

VoxelDynamicSection

A section is a plane which cuts through a voxel volume. Sections can reveal valuable information, such as soil composition and contamination across a subsurface profile. The VoxelDynamicSection allows you to define the properties of an individual dynamic section. You can create VoxelDynamicSection to understand structures in the voxel layer. For example, you can create a cross section diagram to explore an underground model at locations where new construction is planned. VoxelDynamicSection can only be visualized when the renderMode is set to surfaces.

Position, tilt and orientation of a VoxelDynamicSection can be modified with real-time rendering updates.

voxellayer_dynamicsection

VoxelIsosurface

A VoxelIsosurface is a surface representing a specific value within a continuous variable. For example, you can visualize a threshold value for pollutants in the atmosphere as an isosurface. This allows you to identify the location of key values. You can visualize isosurfaces together with sections. VoxelIsosurface can only be visualized when the renderMode is set to surfaces.

By default, the color of an isosurface matches the color in the colorStops for the specific value. You can choose a different color and lock the color by using the property colorLocked in VoxelIsosurface. You can have up to four isosurfaces in a voxel layer.

voxellayer_isosurface

Analysis Tool

The Slice, DirectLineMeasurement3D and AreaMeasurement3D works with VoxelLayer.

Slice

The VoxelLayer treats the slice as an infinite plane and ignores the slice plane extent.

Slice widget allows you to interactively modify a single slice. The visualization created using the Slice widget are temporary and cannot be persisted in a WebScene or in slides.

Below is a comparison between the VoxelSlice and the Slice widget.

VoxelSlice Slice widget
Persisted yes no
Editable yes (by modifiying the properties of the VoxelSlice) yes
Multiple slices yes (by modifiying VoxelVolumeStyle's slices) no

Measurement

The DirectLineMeasurement3D and AreaMeasurement3D allows you to select points in the VoxelLayer to measure. However, the selection of the points and the measurement results may not be accurate. The measurement results include the verticalExaggeration applied to the VoxelLayer.

Popup

You can explore the properties of individual voxels by enabling popups. Take note that popups are not configurable in VoxelLayer and use a default template. The popup will show different attributes depending on the voxel’s volume. All datasets will have the attributes Variable, Value and Voxel Position. If the dataset includes Z coordinate it will have the attribute Depth and if it includes time it will have the attributes Local and Native time.

VoxelLayer Volume

The voxel layer is structured in dimensional regularly gridded cubes that store one or many variables.

A voxel layer can represent different dimensions. The volumeType property in VoxelVolume defines the dimension of the voxel layer.

  • X, Y, Z in which each dimension represents a geographic coordinate

voxellayer_xyz

  • X, Y, T in which X and Y represent a geographic coordinate and T represents time as a level

voxellayer_xyt

  • X, Y, Z, T in which each dimension represents geographic coordinates and includes a fourth dimension representing time.

voxellayer_xyzt

See also

Constructors

VoxelLayer

Constructor
new VoxelLayer(properties)
Parameter
properties Object
optional

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

Example
// Typical usage
let layer = new VoxelLayer({
// URL to the service
url: "your voxel service url"
});

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
Show inherited properties Hide inherited properties
Name Type Summary Class
String

An authorization string used to access a resource or service.

VoxelLayer
String

The copyright text as defined by the scene service.

VoxelLayer
Number

The variable that is being displayed.

VoxelLayer
Object

A list of custom parameters appended to the URL of all resources fetched by the layer.

VoxelLayer
String

The name of the class.

Accessor
Boolean

Controls whether or not to globally disable all dynamic sections in the current VoxelVolumeStyle.

VoxelLayer
Boolean

Controls whether or not to globally disable all isosurfaces in the current VoxelVariableStyle.

VoxelLayer
Boolean

Controls whether or not to globally disable all slices in the current VoxelVolumeStyle.

VoxelLayer
Extent

The full extent of the layer.

Layer
String

The unique ID assigned to the layer.

Layer
Number

The layer ID, or layer index, of a Scene Service layer.

VoxelLayer
Boolean

Indicates whether the layer will be included in the legend.

VoxelLayer
String

Indicates how the layer should display in the LayerList widget.

Layer
Boolean

Indicates whether the layer's resources have loaded.

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
Number

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

VoxelLayer
Number

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

VoxelLayer
Map|Basemap|Ground|GroupLayer

The parent to which the layer belongs.

Layer
Boolean

Enable persistence of the layer in a WebMap or WebScene.

VoxelLayer
Boolean

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

VoxelLayer
PortalItem

The portal item from which the layer is loaded.

VoxelLayer
String

Current rendering mode for the VoxelLayer.

VoxelLayer
SpatialReference

The spatial reference of the layer.

VoxelLayer
String

The title of the layer used to identify it in places such as the LayerList widget.

Layer
String For VoxelLayer the type is always "voxel". VoxelLayer
String

The URL of the REST endpoint of the layer or scene service.

VoxelLayer
Collection<VoxelVariable>

The collection of variables that the VoxelLayer has data for.

VoxelLayer
Collection<VoxelVariableStyle>

The collection of variable styles, containing exactly one VoxelVariableStyle for each VoxelVariable.

VoxelLayer
Object

The version of the scene service specification used for this service.

VoxelLayer
Boolean

Indicates if the layer is visible in the View.

Layer
Collection<VoxelVolume>

The collection of volumes that the VoxelLayer has variables for.

VoxelLayer
Collection<VoxelVolumeStyle>

The collection of volume styles.

VoxelLayer

Property Details

apiKey

Property
apiKey String

An authorization string used to access a resource or service. API keys are generated and managed in the ArcGIS Developer dashboard. An API key is tied explicitly to an ArcGIS account; it is also used to monitor service usage. Setting a fine-grained API key on a specific class overrides the global API key.

Example
// set the api key to access a protected service
const layer = new FeatureLayer({
  url: serviceUrl,
  apiKey: "YOUR_API_KEY"
});
Property
copyright String

The copyright text as defined by the scene service.

currentVariableId

Property
currentVariableId Number
Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, currentVariableId added at 4.24.

The variable that is being displayed. The currentVariableId must be the id of a VoxelVariable that is in the variables collection of the VoxelLayer.

Default Value:0

customParameters

Property
customParameters Object

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"
  }
});

declaredClass

Inherited
Property
declaredClass Stringreadonly
Inherited from Accessor

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

enableDynamicSections

Property
enableDynamicSections Boolean
Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, enableDynamicSections added at 4.25.

Controls whether or not to globally disable all dynamic sections in the current VoxelVolumeStyle.

enableIsosurfaces

Property
enableIsosurfaces Boolean
Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, enableIsosurfaces added at 4.25.

Controls whether or not to globally disable all isosurfaces in the current VoxelVariableStyle.

enableSlices

Property
enableSlices Boolean
Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, enableSlices added at 4.25.

Controls whether or not to globally disable all slices in the current VoxelVolumeStyle.

fullExtent

Inherited
Property
fullExtent Extentautocast
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;
});

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.

layerId

Property
layerId Number

The layer ID, or layer index, of a Scene Service layer. This is particularly useful when loading a single layer 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 Scene 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
// while these examples use a SceneLayer, the same pattern can be
// used for other layers that may be loaded from portalItem ids

// loads the third layer in the given Portal Item
let layer = new SceneLayer({
  portalItem: {
    id: "73df987984b24094b848d580eb83b0fb"
  },
  layerId: 2
});
// If not specified, the first layer (layerId: 0) will be returned
let layer = new SceneLayer({
  portalItem: {
    id: "73df987984b24094b848d580eb83b0fb"
  }
});
// Can also be used if URL points to service and not layer
let layer = new SceneLayer({
  url: "https://scenesampleserverdev.arcgis.com/arcgis/rest/services/Hosted/DevA_Trees/SceneServer",
  layerId: 0  // Notice that the url doesn't end with /2
});
// This code returns the same layer as the previous snippet
let layer = new SceneLayer({
  url: "https://scenesampleserverdev.arcgis.com/arcgis/rest/services/Hosted/DevA_Trees/SceneServer/layers/0",
  // The layer id is specified in the URL
});

legendEnabled

Property
legendEnabled Boolean

Indicates whether the layer will be included in the legend.

Default Value:true

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"

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

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.

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;

parent

Inherited
Property
parent Map|Basemap|Ground|GroupLayer
Inherited from Layer
Since: ArcGIS Maps SDK for JavaScript 4.27 Layer since 4.0, parent added at 4.27.

The parent to which the layer belongs.

persistenceEnabled

Property
persistenceEnabled Boolean
Since: ArcGIS Maps SDK for JavaScript 4.28 VoxelLayer since 4.22, persistenceEnabled added at 4.28.

Enable persistence of the layer in a WebMap or WebScene.

Default Value:true

popupEnabled

Property
popupEnabled Boolean
Since: ArcGIS Maps SDK for JavaScript 4.26 VoxelLayer since 4.22, popupEnabled added at 4.26.

Indicates whether to display popups when voxels in the layer are clicked. Popups are not configurable and a default popup template will automatically be created.

Default Value:false

portalItem

Property
portalItem PortalItem

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);
  }
});

renderMode

Property
renderMode String
Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, renderMode added at 4.24.

Current rendering mode for the VoxelLayer. The volume mode draws the full voxel layer volume whereas the surfaces mode draws dynamic sections and isosurfaces only.

Possible Values:"volume"|"surfaces"

Default Value:"volume"

spatialReference

Property
spatialReference SpatialReferenceautocast

The spatial reference of the layer.

title

Inherited
Property
title String
Inherited from Layer

The title of the layer used to identify it in places such as the LayerList widget.

If the layer is loaded from a portal item, the title of the portal item will be used. 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 VoxelLayer the type is always "voxel".

url

Property
url String

The URL of the REST endpoint of the layer or scene service. The URL may either point to a resource on ArcGIS Enterprise or ArcGIS Online.

The layer may be specified using the layerId property when the url points directly to a service and not a specific layer. If layerId is not specified, then it will default to the first layer in the service.

Examples
// Layer from Scene Service on ArcGIS Server
let sceneLayer = new SceneLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Paris_3D_Local_WSL2/SceneServer/layers/0"
});
// Can also be used if URL points to service and not layer
let layer = new SceneLayer({
  // Notice that the url doesn't end with /0
  url: "https://scenesampleserverdev.arcgis.com/arcgis/rest/services/Hosted/DevA_Trees/SceneServer",
  layerId: 0
});

variables

Property
variables Collection<VoxelVariable>readonly
Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, variables added at 4.24.

The collection of variables that the VoxelLayer has data for.

variableStyles

Property
variableStyles Collection<VoxelVariableStyle>
Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, variableStyles added at 4.25.

The collection of variable styles, containing exactly one VoxelVariableStyle for each VoxelVariable.

version

Property
version Objectreadonly

The version of the scene service specification used for this service.

Properties
major Number

The major version of the scene layer.

minor Number

The minor version of the scene layer.

versionString String

The complete version string of the scene layer.

See also
Example
// Prints the version to the console - e.g. 1.4, 1.5, etc.
console.log(layer.version.versionString);

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;

volumes

Property
volumes Collection<VoxelVolume>readonly
Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, volumes added at 4.25.

The collection of volumes that the VoxelLayer has variables for. Currently only a single volume is supported.

volumeStyles

Property
volumeStyles Collection<VoxelVolumeStyle>
Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, volumeStyles added at 4.24.

The collection of volume styles. There is currently only one volume and thus also only one VoxelVolumeStyle.

Method Overview

Show inherited methods Hide inherited methods
Name Return Type Summary Class

Adds one or more handles which are to be tied to the lifecycle of the object.

Accessor

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

Layer

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
Color|null

Returns a Color for a given value for the continuous VoxelVariable identified by variableId using the variable's VoxelTransferFunctionStyle.

VoxelLayer
VoxelVariable|null

Returns a VoxelVariable based on an id.

VoxelLayer
VoxelVariableStyle|null

Returns a VoxelVariableStyle based on an id.

VoxelLayer
VoxelVolume|null

Returns a VoxelVolume based on the id of a VoxelVariable.

VoxelLayer
VoxelVolumeStyle|null

Returns a VoxelVolumeStyle based on the id of a VoxelVariable.

VoxelLayer
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
Object

Registers an event handler on the instance.

Layer

Removes a group of handles owned by the object.

Accessor
Promise

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

Layer

Method Details

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.

cancelLoad

Inherited
Method
cancelLoad()
Inherited from Layer

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

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.

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.

getColorForContinuousDataValue

Method
getColorForContinuousDataValue(variableId, dataValue, applyOpacityStops){Color|null}
Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, getColorForContinuousDataValue added at 4.25.

Returns a Color for a given value for the continuous VoxelVariable identified by variableId using the variable's VoxelTransferFunctionStyle. The applyOpacityStops parameter determines whether the transfer function's opacity stops are applied or not. Returns null if the variable is not a continuous variable or if the transfer function is not configured correctly.

Parameters
variableId Number

Voxel variable id for a continous variable.

dataValue Number

The continuous data value to get a color for.

applyOpacityStops Boolean

Whether or not to apply the opacity stops to the returned color.

Returns
Type Description
Color | null The color or null if an invalid variableId was passed in.

getVariable

Method
getVariable(variableId){VoxelVariable|null}
Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, getVariable added at 4.24.

Returns a VoxelVariable based on an id. If you call getVariable(null) the current VoxelVariable is returned.

Parameter
variableId Number|null

Voxel variable id.

Returns
Type Description
VoxelVariable | null The variable or null if an invalid variableId was passed in.

getVariableStyle

Method
getVariableStyle(variableId){VoxelVariableStyle|null}
Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, getVariableStyle added at 4.25.

Returns a VoxelVariableStyle based on an id. If you call getVariableStyle(null) the current VoxelVariableStyle is returned.

Parameter
variableId Number|null

Voxel variable id.

Returns
Type Description
VoxelVariableStyle | null The variable style or null if an invalid variableId was passed in.

getVolume

Method
getVolume(variableId){VoxelVolume|null}
Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, getVolume added at 4.25.

Returns a VoxelVolume based on the id of a VoxelVariable. If you call getVolume(null) the current variable's VoxelVolume is returned.

Parameter
variableId Number|null

Voxel variable id.

Returns
Type Description
VoxelVolume | null The volume or null if an invalid variableId was passed in.

getVolumeStyle

Method
getVolumeStyle(variableId){VoxelVolumeStyle|null}
Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, getVolumeStyle added at 4.25.

Returns a VoxelVolumeStyle based on the id of a VoxelVariable. If you call getVolumeStyle(null) the current variable's VoxelVolumeStyle is returned.

Parameter
variableId Number|null

Voxel variable id.

Returns
Type Description
VoxelVolumeStyle | null The volume style or null if an invalid variableId was passed in.

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.

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

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);
});

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");

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
Name Type Summary Class
{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

Event Details

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
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
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.

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