SceneLayerView | API Reference | ArcGIS Maps SDK for JavaScript 4.31

Represents the LayerView of a SceneLayer after it has been added to a Map in a SceneView.

The SceneLayerView is responsible for streaming and rendering a SceneLayer's features in the SceneView. The methods in the SceneLayerView provide developers with the ability to query loaded features. See the code snippets in the methods below for examples of how to access client-side graphics from the view.

Features in a SceneLayer are loaded progressively, starting from coarse representations that are refined to higher levels of detail as necessary for close-up views.

Queries on the SceneLayerView will be executed against features that have been loaded for the current view. This means that only visible features are guaranteed to be available once the layer has finished updating. At lower levels of detail, features may be omitted from rendering by the SceneLayerView, and will therefore not be included in the results of queries. This means that the query methods on the SceneLayerView should not be used when the intention is to query or search within the whole dataset, instead the query methods on the SceneLayer should be used. Queries on the SceneLayerView do not currently support returning geometries for 3D Object scene layer views.

To only execute a query once the loading of features has completed, applications can wait until the updating property of the SceneLayerView is false. Batched Queries with num and start should only be used when this SceneLayerView is not updating, otherwise the result is undefined.

See also

Property Overview

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

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Type	Summary	Class
String []	A list of attribute fields fetched for each feature including fields required for layer rendering and additional fields defined on the SceneLayer.outFields.	SceneLayerView
String	The name of the class.	Accessor
FeatureFilter	Applies a client-side FeatureFilter to the displayed data.	SceneLayerView
SceneLayer	The scene layer being viewed.	SceneLayerView
Number	The maximum number of features that can be displayed at a time.	SceneLayerView
Boolean	Signifies whether the maximum number of features has been exceeded.	SceneLayerView
Boolean	Value is `true` if the layer is suspended (i.e., layer will not redraw or update itself when the extent changes).	SceneLayerView
Boolean	Indicates if the layer view is making any updates that will impact what is displayed on the map.	LayerView
MapView\|SceneView	A reference to the MapView or SceneView associated with the layer view.	LayerView
Boolean	When `true`, the layer is visible in the view.	LayerView
Boolean	When `true`, the layer is visible in the view at the current scale.	LayerView
Boolean	When `true`, the layer is visible in the view's timeExtent.	LayerView

Property Details

availableFields Property availableFields String[]readonly Since: ArcGIS Maps SDK for JavaScript 4.12 SceneLayerView since 4.3, availableFields added at 4.12.

A list of attribute fields fetched for each feature including fields required for layer rendering and additional fields defined on the SceneLayer.outFields. The availableFields is populated when the layer view is finished updating. Use this list when querying features on the client-side.

See also

SceneLayer.outFields

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.7 Accessor since 4.0, declaredClass added at 4.7.

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

filter Property filter FeatureFilterautocast Since: ArcGIS Maps SDK for JavaScript 4.11 SceneLayerView since 4.3, filter added at 4.11.

Applies a client-side FeatureFilter to the displayed data. Only the features that satisfy the filter are displayed. The fields to be used for the filter must be present in the layer view's availableFields list.

Known Limitations

The timeExtent property is not supported on a SceneLayerView filter.
For 3D object scene layers, only spatial filters with spatialRelationship set to contains, intersects or disjoint are supported.

layer Property layer SceneLayerreadonly

The scene layer being viewed.

maximumNumberOfFeatures Property maximumNumberOfFeatures Number Since: ArcGIS Maps SDK for JavaScript 4.11 SceneLayerView since 4.3, maximumNumberOfFeatures added at 4.11.

The maximum number of features that can be displayed at a time. This setting currently only applies to point scene layer views. By default, the maximum number of features is estimated automatically depending on the symbology, geometry complexity, memory consumption and display quality profile.

Changing this setting to a higher value may lead to a significant decrease in performance and increase in memory usage.

maximumNumberOfFeaturesExceeded Property maximumNumberOfFeaturesExceeded Boolean Since: ArcGIS Maps SDK for JavaScript 4.11 SceneLayerView since 4.3, maximumNumberOfFeaturesExceeded added at 4.11.

Signifies whether the maximum number of features has been exceeded. Not all features could be displayed when this value is true. This setting currently only applies to point scene layer views.

suspended Property suspended Booleanreadonly

Value is true if the layer is suspended (i.e., layer will not redraw or update itself when the extent changes).

updating Inherited Property updating Booleanreadonly Inherited from LayerView

Indicates if the layer view is making any updates that will impact what is displayed on the map. For example, this value is true when renderer, definitionExpression, filter or effect is changed or if the layer view is in the process of the fetching data.

Watch dataUpdating property instead to only know when the data has been updated (e.g. to run statistics query on all feature available in the layer view).

Default Value:false

Example

// Check for the first time layerView.updating becomes false. Then query for
// features that are visible within the view associated with the layer view.
await reactiveUtils.whenOnce(() => !layerView.updating);
const query = layerView.createQuery();
query.geometry = layerView.view.extent;
const result = layerView.queryFeatures(query);

view Inherited Property view MapView |SceneViewreadonly Inherited from LayerView Since: ArcGIS Maps SDK for JavaScript 4.28 LayerView since 4.0, view added at 4.28.

A reference to the MapView or SceneView associated with the layer view.

Example

// Check for the first time layerView.updating becomes false. Then query for
// features that are visible within the view associated with the layer view.
await reactiveUtils.whenOnce(() => !layerView.updating);
const query = layerView.createQuery();
query.geometry = layerView.view.extent;
const result = layerView.queryFeatures(query);

visible Inherited Property visible Boolean Inherited from LayerView

When true, the layer is visible in the view. Value of this property is inherited from the layer.visible unless the developer overrides it. The layerView.visible will take precedence over layer.visible if both properties are set.

Default Value:true

visibleAtCurrentScale Inherited Property visibleAtCurrentScale Booleanreadonly Inherited from LayerView Since: ArcGIS Maps SDK for JavaScript 4.30 LayerView since 4.0, visibleAtCurrentScale added at 4.30.

When true, the layer is visible in the view at the current scale. This applies to layers that have minScale and maxScale properties set.

Known Limitations

This property is not supported in 3D SceneView tiled layers.

Default Value:true

See also

visibleAtCurrentTimeExtent
suspended

visibleAtCurrentTimeExtent Inherited Property visibleAtCurrentTimeExtent Booleanreadonly Inherited from LayerView Since: ArcGIS Maps SDK for JavaScript 4.30 LayerView since 4.0, visibleAtCurrentTimeExtent added at 4.30.

When true, the layer is visible in the view's timeExtent. This applies to layers that have a visibilityTimeExtent.

Default Value:true

See also

visibleAtCurrentScale
suspended

Method Overview

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Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
Query	Creates query parameter object that can be used to fetch features as they are being displayed.	SceneLayerView
Boolean	Returns true if a named group of handles exist.	Accessor
Handle	Highlights the given feature(s).	SceneLayerView
Boolean	`isFulfilled()` may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).	LayerView
Boolean	`isRejected()` may be used to verify if creating an instance of the class is rejected.	LayerView
Boolean	`isResolved()` may be used to verify if creating an instance of the class is resolved.	LayerView
Promise<Object>	Executes a Query against features in the layer view and returns the 3D Extent of features that satisfy the query.	SceneLayerView
Promise<Number>	Executes a Query against features in the layer view and returns the number of features that satisfy the query.	SceneLayerView
Promise<FeatureSet>	Executes a Query against features in the layer view and returns a FeatureSet.	SceneLayerView
Promise<Number []>	Executes a Query against features in the layer view and returns an array of the ObjectIDs of features that satisfy the input query.	SceneLayerView
	Removes a group of handles owned by the object.	Accessor
Promise	`when()` may be leveraged once an instance of the class is created.	LayerView

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.

createQuery Method createQuery(){Query}

Creates query parameter object that can be used to fetch features as they are being displayed. It sets the query parameter's outFields property to ["*"] and returnGeometry to false for 3D Object scene layer views and true for point scene layer views. The output spatial reference is set to the spatial reference of the view. The filter that currently applies to the layer view is also incorporated in the returned query object.

Returns

Type	Description
Query	The query object

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");
}

highlight Method highlight(target){Handle} Since: ArcGIS Maps SDK for JavaScript 4.4 SceneLayerView since 4.3, highlight added at 4.4.

Highlights the given feature(s).

Parameter

target Graphic|Graphic []|Number|Number []

optional

The feature(s) to highlight. When passing a graphic or array of graphics, each feature must have a valid objectID. You may alternatively pass one or more objectIDs as a single number or an array.

Returns

Type	Description
Handle	Returns a highlight handler with a `remove()` method that can be called to remove the highlight.

See also

Examples

// highlight features based on a layer query result
// this workflow is valid only if the scene layer has an associated feature layer
let highlight;
view.whenLayerView(sceneLayer).then(function(layerView){
 let query = sceneLayer.createQuery();
 query.where = "type = 'Quercus'";
 sceneLayer.queryFeatures(query).then(function(result){
   if (highlight) {
     highlight.remove();
   }
   highlight = layerView.highlight(result.features);
 })
});

// highlight feature on pointer-move
view.on("pointer-move", function(event){
 view.hitTest(event).then(function(response){
   if (response.results[0]) {
     let graphic = response.results[0].graphic;
     view.whenLayerView(graphic.layer).then(function(layerView){
       layerView.highlight(graphic);
     })
   }
 })
});

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

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 LayerView

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 LayerView

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.

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

Executes a Query against features in the layer view and returns the 3D Extent of features that satisfy the query. If query parameters are not provided, the extent and count of all loaded features are returned.

Read more about queries in the Query section of the SceneLayer class description.

To query for the extent of features directly from a Scene Service rather than those loaded for the current view, you must use the SceneLayer.queryExtent() method.

For making attribute based queries on a SceneLayerView you need to specify the required fields in the outFields property of the SceneLayer to ensure that attribute values are available on the client for querying. You can use availableFields to inspect which fields are available on the client.

Known Limitations

Spatial queries have the same limitations as those listed in the projection engine documentation.
Spatial queries on 3D Object scene layer views use the Extent of the feature and not the footprint when calculating the spatial relationship with the query geometry. This means that a feature might be returned from the query, even though its footprint is not in a spatial relationship with the geometry.
Currently only intersects, contains, and disjoint spatialRelationships are supported on spatial queries.
Spatial queries are not currently supported if the SceneLayerView has any of the following SpatialReferences:
- GDM 2000 (4742) - Malaysia
- Gsterberg (Ferro) (8042) - Austria/Czech Republic
- ISN2016 (8086) - Iceland
- SVY21 (4757) - Singapore

Parameters

query Query autocast

optional

Autocasts from Object

Specifies the attributes and spatial filter of the query. When no parameters are passed to this method, all features in the client are returned.

options Object

optional

An object with the following properties.

Specification

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<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	The extent of the features that satisfy the query.

Example

let layer = new SceneLayer({
  url: ssUrl  // points to a Scene Service layer url
});

view.whenLayerView(layer).then(function(layerView){
  reactiveUtils.whenOnce(() => !layerView.updating)
  .then(function() {
    return layerView.queryExtent();
  })
  .then(function(results) {
    view.goTo(results.extent); // go to the extent of all the graphics in the layer view
  });
});

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

Executes a Query against features in the layer view and returns the number of features that satisfy the query. If query parameters are not provided, the count of all loaded features is returned. Read more about queries in the Query section of the SceneLayer class description.

To query for the count of features directly from a Scene Service rather than those loaded for the current view, you must use the SceneLayer.queryFeatureCount() method.

Known Limitations

Spatial queries have the same limitations as those listed in the projection engine documentation.
Spatial queries on 3D Object scene layer views use the Extent of the feature and not the footprint when calculating the spatial relationship with the query geometry. This means that a feature might be returned from the query, even though its footprint is not in a spatial relationship with the geometry.
Currently only intersects, contains, and disjoint spatialRelationships are supported on spatial queries.
Spatial queries are not currently supported if the SceneLayerView has any of the following SpatialReferences:
- GDM 2000 (4742) - Malaysia
- Gsterberg (Ferro) (8042) - Austria/Czech Republic
- ISN2016 (8086) - Iceland
- SVY21 (4757) - Singapore

Parameters

query Query autocast

optional

Autocasts from Object

Specifies the attributes and spatial filter of the query. When no parameters are passed to this method, all features in the client are returned. To only return features visible in the view, set the geometry parameter in the query object to the view's extent.

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 satisfying the query.

Example

let layer = new SceneLayer({
  url: ssUrl  // points to a Scene Service layer url
});

view.whenLayerView(layer).then(function(layerView){
  reactiveUtils.whenOnce(() => !layerView.updating)
  .then(function() {
    return layerView.queryFeatureCount();
  })
  .then(function(count) {
    console.log(count); // prints the number of client-side graphics that are currently loaded
  });
});

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

Executes a Query against features in the layer view and returns a FeatureSet. If query parameters are not provided, all loaded features are returned.

To execute a query against all the features in a Scene Service rather than only those loaded for the current view, you must use the SceneLayer.queryFeatures() method.

Known Limitations

returnGeometry is currently not supported for 3D Object scene layer views. See SceneLayer.queryFeatures() for support for obtaining 3D Object geometries.
Spatial queries have the same limitations as those listed in the projection engine documentation.
Spatial queries on 3D Object scene layer views use the Extent of the feature and not the footprint when calculating the spatial relationship with the query geometry. This means that a feature might be returned from the query, even though its footprint is not in a spatial relationship with the geometry.
Currently only intersects, contains, and disjoint spatialRelationships are supported on spatial queries.
Spatial queries are not currently supported if the SceneLayerView has any of the following SpatialReferences:
- GDM 2000 (4742) - Malaysia
- Gsterberg (Ferro) (8042) - Austria/Czech Republic
- ISN2016 (8086) - Iceland
- SVY21 (4757) - Singapore

Parameters

query Query autocast

optional

Autocasts from Object

Specifies the attributes and spatial filter of the query. When no parameters are passed to this method, all features in the client are returned along with their attributes specified in availableFields. To only return features visible in the view, set the geometry parameter in the query object to the view's extent.

options Object

optional

An object with the following properties.

Specification

signal AbortSignal

optional

Returns

Type	Description
Promise<FeatureSet>	When resolved, a FeatureSet is returned. The set will be empty if zero results are found.

Examples

let layer = new SceneLayer({
  url: ssUrl  // points to a Scene Service layer url
});

// returns loaded features from the layer view that match the query
let query = new Query();
query.objectIds = [10, 125, 126, 200, 201];
query.outFields = ["NAME", "STATE_ABBR", "POP04"];

view.whenLayerView(layer).then(function(layerView){
  reactiveUtils.whenOnce(() => !layerView.updating)
  .then(function() {
    return layerView.queryFeatures(query);
  })
  .then(function(result) {
    console.log(result.features); // prints the client-side graphics to the console
  });
});

let layer = new SceneLayer({
  url: ssUrl  // points to a Scene Service layer url
});

const layerView = await view.whenLayerView(layer);
await reactiveUtils.whenOnce(() => !layerView.updating);

// returns all loaded features from the layer view
const result = await layerView.queryFeatures()
console.log(result.features);  // prints all loaded client-side graphics to the console

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

Executes a Query against features in the layer view and returns an array of the ObjectIDs of features that satisfy the input query. If query parameters are not provided, the ObjectIDs of all loaded features are returned.

To query for ObjectIDs of features directly from a Scene Service rather than those loaded for the current view, you must use the SceneLayer.queryObjectIds() method.

Known Limitations

Spatial queries have the limitations listed in the projection engine documentation.
Spatial queries on 3D Object scene layer views use the Extent of the feature and not the footprint when calculating the spatial relationship with the query geometry. This means that a feature might be returned from the query, even though its footprint is not in a spatial relationship with the geometry.
Currently only intersects, contains, and disjoint spatialRelationships are supported on spatial queries.
Spatial queries are not currently supported if the SceneLayerView has any of the following SpatialReferences:
- GDM 2000 (4742) - Malaysia
- Gsterberg (Ferro) (8042) - Austria/Czech Republic
- ISN2016 (8086) - Iceland
- SVY21 (4757) - Singapore

Parameters

query Query autocast

optional

Autocasts from Object

Specifies the attributes of the query. If query parameters are not provided, all loaded features 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 ObjectIDs of the features satisfying the query.

Example

let layer = new SceneLayer({
  url: ssUrl  // points to a Scene Service layer url
});

// returns all the Ids from the features in the layer view
view.whenLayerView(layer).then(function(layerView){
  return layerView.queryObjectIds();
}).then(function(ids){
  console.log(ids);  // prints the ids of all the client-side graphics to the console
});

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 LayerView Since: ArcGIS Maps SDK for JavaScript 4.6 LayerView since 4.0, when added at 4.6.

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
});