FeatureLayerView

Class: esri/views/layers/FeatureLayerView
Inheritance: FeatureLayerView LayerView Accessor
Since: ArcGIS API for JavaScript 4.0

Represents the LayerView of a FeatureLayer after it has been added to a Map in either a MapView or SceneView.

The FeatureLayerView is responsible for rendering a FeatureLayer's features as graphics in the View. The methods in the FeatureLayerView provide developers with the ability to query and highlight graphics in the view. See the code snippets in the methods below for examples of how to access client-side graphics from the view.

See also:

Property Overview

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

The name of the class.

more details
more detailsAccessor
FeatureLayer

The layer being viewed.

more details
more detailsFeatureLayerView
Number

The maximum number of features that can be displayed at a time.

more details
more detailsFeatureLayerView
Boolean

Signifies whether the maximum number of features has been exceeded.

more details
more detailsFeatureLayerView
Boolean

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

more details
more detailsLayerView
Boolean

Value is true when the layer is updating; for example, if it is in the process of fetching data.

more details
more detailsLayerView
Boolean

When true, the layer is visible in the view.

more details
more detailsLayerView

Property Details

declaredClassStringreadonly inherited
Since: ArcGIS API for JavaScript 4.7

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

layerFeatureLayerreadonly

The layer being viewed.

maximumNumberOfFeaturesNumber

The maximum number of features that can be displayed at a time. This setting currently only applies to SceneView. 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.

maximumNumberOfFeaturesExceededBoolean

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 SceneView.

suspendedBooleanreadonly inherited

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

updatingBooleanreadonly inherited

Value is true when the layer is updating; for example, if it is in the process of fetching data.

Default Value:false

When true, the layer is visible in the view. Set this property to false to hide the layer from the view.

Default Value:true

Method Overview

NameReturn TypeSummaryClass
Object

Highlights the given feature(s).

more details
more detailsFeatureLayerView
Boolean

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

more details
more detailsLayerView
Boolean

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

more details
more detailsLayerView
Boolean

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

more details
more detailsLayerView
Promise<Object>

Executes a Query against features available for drawing in the layer view and returns the Extent of features that satisfy the query.

more details
more detailsFeatureLayerView
Promise<Number>

Executes a Query against features available for drawing in the layer view and returns the number of features that satisfy the query.

more details
more detailsFeatureLayerView
Promise<FeatureSet>

Executes a Query against features available for drawing in the layer view and returns a FeatureSet.

more details
more detailsFeatureLayerView
Promise<Number[]>

Executes a Query against features available for drawing in the layer view and returns array of the ObjectIDs of features that satisfy the input query.

more details
more detailsFeatureLayerView
Promise

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

more details
more detailsLayerView

Method Details

highlight(target){Object}
Since: ArcGIS API for JavaScript 4.4

Highlights the given feature(s).

Parameter:
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:
TypeDescription
ObjectReturns a highlight handler with a remove() method that can be called to remove the highlight.
PropertyTypeDescription
removeFunctionWhen called, removes the highlight of the selected graphics.
See also:
Examples:
// highlight features based on a query result
var highlight;
view.whenLayerView(treesLayer).then(function(layerView){
 var query = treesLayer.createQuery();
 query.where = "type = 'Quercus'";
 treesLayer.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.length) {
      var graphic = response.results.filter(function (result) {
        return result.graphic.layer === treesLayer;
      })[0].graphic;

     view.whenLayerView(graphic.layer).then(function(layerView){
       layerView.highlight(graphic);
     });
    }
  });
});
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.
queryExtent(params){Promise<Object>}

Executes a Query against features available for drawing in the layer view and returns the Extent of features that satisfy the query. Valid only for hosted feature services on arcgis.com and for ArcGIS Server 10.3.1 and later. If query parameters are not provided, the extent and count of all features available for drawing are returned.

To query for the extent of features directly from a Feature Service rather than those visible in the view, you must use the FeatureLayer.queryExtent() method.

Known Limitations

  • Queries with outStatistics and any other parameter involving statistics are currently not supported in 3D SceneViews.
  • Spatial queries are executed against quantized geometries in the layer view. The resolution of layer view geometries, is only as precise as the scale resolution of the view. Therefore, the results of the same query could be different when executed at different scales. This also means that geometries returned from any layer view query will likewise be at the same scale resolution of the view.
  • Spatial queries have the same limitations as those listed in the projection engine documentation.
  • Spatial queries are not currently supported if the FeatureLayerView has any of the following SpatialReferences:
    • GDM 2000 (4742) – Malaysia
    • Gusterberg (Ferro) (8042) – Austria/Czech Republic
    • ISN2016 (8086) - Iceland
    • SVY21 (4757) - Singapore
Parameter:
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.

Returns:
TypeDescription
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.
PropertyTypeDescription
countNumberThe number of features that satisfy the input query.
extentExtentThe extent of the features that satisfy the query.
Example:
var layer = new FeatureLayer({
  url: fsUrl  // points to a Feature Service layer url
});

view.whenLayerView(layer).then(function(layerView){
  layerView.watch("updating", function(val){
    if(!val){  // wait for the layer view to finish updating
      layerView.queryExtent().then(function(results){
        view.goTo(results.extent);  // go to the extent of all the graphics in the layer view
      });
    }
  });
});
queryFeatureCount(params){Promise<Number>}

Executes a Query against features available for drawing in the layer view and returns the number of features that satisfy the query. If query parameters are not provided, the count of all features available for drawing is returned.

To query for the count of features directly from a Feature Service rather than those visible in the view, you must use the FeatureLayer.queryFeatureCount() method.

Known Limitations

  • Queries with outStatistics and any other parameter involving statistics are currently not supported in 3D SceneViews.
  • Spatial queries are executed against quantized geometries in the layer view. The resolution of layer view geometries, is only as precise as the scale resolution of the view. Therefore, the results of the same query could be different when executed at different scales. This also means that geometries returned from any layer view query will likewise be at the same scale resolution of the view.
  • Spatial queries have the same limitations as those listed in the projection engine documentation.
  • Spatial queries are not currently supported if the FeatureLayerView has any of the following SpatialReferences:
    • GDM 2000 (4742) – Malaysia
    • Gusterberg (Ferro) (8042) – Austria/Czech Republic
    • ISN2016 (8086) - Iceland
    • SVY21 (4757) - Singapore
Parameter:
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.

Returns:
TypeDescription
Promise<Number>When resolved, returns the number of features satisfying the query.
Examples:
var layer = new FeatureLayer({
  url: fsUrl  // points to a Feature Service layer url
});

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

  var query = new Query();
  query.geometry = event.mapPoint;  // obtained from a view click event
  query.spatialRelationship = "intersects";

  view.whenLayerView(layer).then(function(layerView){
    watchUtils.whenNotOnce(layerView, "updating")
    .then(function(){
      return layerView.queryFeatureCount(query);
    })
    .then(function(count){
      console.log(count);  // prints the number of the client-side graphics that satisfy the query
    });
  });
});
var layer = new FeatureLayer({
  url: fsUrl  // points to a Feature Service layer url
});

view.whenLayerView(layer).then(function(layerView){
  return layerView.queryFeatureCount()
}).then(function(count){
  console.log(count);  // prints the total number of client-side graphics to the console
});
queryFeatures(params){Promise<FeatureSet>}

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

To execute a query against all the features in a Feature Service rather than only those in the client, you must use the FeatureLayer.queryFeatures() method.

Known Limitations

  • Queries with outStatistics and any other parameter involving statistics are currently not supported in 3D SceneViews.
  • Spatial queries are executed against quantized geometries in the layer view. The resolution of layer view geometries, is only as precise as the scale resolution of the view. Therefore, the results of the same query could be different when executed at different scales. This also means that geometries returned from any layer view query will likewise be at the same scale resolution of the view.
  • Spatial queries have the same limitations as those listed in the projection engine documentation.
  • Spatial queries are not currently supported if the FeatureLayerView has any of the following SpatialReferences:
    • GDM 2000 (4742) – Malaysia
    • Gusterberg (Ferro) (8042) – Austria/Czech Republic
    • ISN2016 (8086) - Iceland
    • SVY21 (4757) - Singapore
Parameter:
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.

Returns:
TypeDescription
Promise<FeatureSet>When resolved, a FeatureSet containing an array of graphic features is returned.
See also:
Examples:
var layer = new FeatureLayer({
  url: fsUrl  // points to a Feature Service layer url
});

var query = new Query();
query.geometry = new Extent({
 xmin: -9177811,
 ymin: 4247000,
 xmax: -9176791,
 ymax: 4247784,
 spatialReference: 102100
});
query.spatialRelationship = "intersects";

view.whenLayerView(layer).then(function(layerView){
  layerView.watch("updating", function(val){
    if(!val){  // wait for the layer view to finish updating
      layerView.queryFeatures(query).then(function(results){
        console.log(results.features);  // prints the array of client-side graphics to the console
      });
    }
  });
});
var layer = new FeatureLayer({
  url: fsUrl  // points to a Feature Service layer url
});

// returns all the graphics from the layer view
view.whenLayerView(layer).then(function(layerView){
  layerView.watch("updating", function(val){
    if(!val){  // wait for the layer view to finish updating
      layerView.queryFeatures().then(function(results){
        console.log(results.features);  // prints all the client-side graphics to the console
      });
    }
  });
});
queryObjectIds(params){Promise<Number[]>}

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

To query for ObjectIDs of features directly from a Feature Service rather than those visible in the view, you must use the FeatureLayer.queryObjectIds() method.

Known Limitations

  • Queries with outStatistics and any other parameter involving statistics are currently not supported in 3D SceneViews.
  • Spatial queries are executed against quantized geometries in the layer view. The resolution of layer view geometries, is only as precise as the scale resolution of the view. Therefore, the results of the same query could be different when executed at different scales. This also means that geometries returned from any layer view query will likewise be at the same scale resolution of the view.
  • Spatial queries have the same limitations as those listed in the projection engine documentation.
  • Spatial queries are not currently supported if the FeatureLayerView has any of the following SpatialReferences:
    • GDM 2000 (4742) – Malaysia
    • Gusterberg (Ferro) (8042) – Austria/Czech Republic
    • ISN2016 (8086) - Iceland
    • SVY21 (4757) - Singapore
Parameter:
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.

Returns:
TypeDescription
Promise<Number[]>When resolved, returns an array of numbers representing the ObjectIDs of the features satisfying the query.
Examples:
var layer = new FeatureLayer({
  url: fsUrl  // points to a Feature Service layer url
});

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

  var query = new Query();
  query.geometry = event.mapPoint;  // obtained from a view click event
  query.spatialRelationship = "intersects";

  view.whenLayerView(layer).then(function(layerView){
    watchUtils.whenNotOnce(layerView, "updating")
    .then(function(){
      return layerView.queryObjectIds(query);
    })
    .then(function(ids){
      console.log(ids);  // prints the ids of the client-side graphics to the console
    });
  });
});
var layer = new FeatureLayer({
  url: fsUrl  // points to a Feature Service layer url
});

// returns all the Ids from the graphics 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
});
when(callback, errback){Promise}inherited
Since: ArcGIS API for JavaScript 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:
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 then() 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
});

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