Represents the LayerView of a OGCFeatureLayer after it has been added to a Map in either a MapView or SceneView. The OGCFeatureLayerView is responsible for rendering a OGCFeatureLayer's features as graphics in the View.
- See also
Property Overview
Name | Type | Summary | Class |
---|---|---|---|
String[] | A list of attribute fields fetched for each feature including fields required for layer's | OGCFeatureLayerView | |
String | The name of the class. more details | Accessor | |
FeatureEffect | The featureEffect can be used to draw attention features of interest. more details | OGCFeatureLayerView | |
FeatureFilter | The attribute, geometry, and time extent filter. more details | OGCFeatureLayerView | |
HighlightOptions | Options for configuring the highlight. more details | OGCFeatureLayerView | |
Layer | The layer being viewed. more details | LayerView | |
Number | The maximum number of features that can be displayed at a time. more details | OGCFeatureLayerView | |
Boolean | Signifies whether the maximum number of features has been exceeded. more details | OGCFeatureLayerView | |
Boolean | Indicates if the spatialReference of the MapView is supported by the layer view. more details | LayerView | |
Boolean | Value is | LayerView | |
Boolean | Value is | LayerView | |
Boolean | When | LayerView |
Property Details
-
A list of attribute fields fetched for each feature including fields required for layer's
renderer
labelingInfo
,elevationInfo
, and additional fields defined on theoutFields
properties. TheavailableFields
property is populated when the layerView has finished updating. TheavailableFields
is used when filtering or querying features on the client-side.Exampleview.whenLayerView(layer).then(function(layerView){ layerView.watch("updating", function(value){ // availableFields will become available // once the layerView finishes updating if (!value) { layerView.queryFeatures({ outFields: layerView.availableFields, where: "DEW_POINT > 10" }) .then(function(results) { console.log(results.features.length, " features returned"); }) .catch(function(error) { console.log("query failed: ", error); }); } }); });
-
The name of the class. The declared class name is formatted as
esri.folder.className
.
-
featureEffect FeatureEffectautocastSince: ArcGIS Maps SDK for JavaScript 4.22
-
The featureEffect can be used to draw attention features of interest. It allows for the selection of features via a filter, and an includedEffect and excludedEffect are applied to those features that respectively pass or fail the filter requirements.
If the
featureEffect
is set on the layer, it will be inherited bylayerView.featureEffect
unless the developer overrides it on the layerView. ThelayerView.featureEffect
will take precedence overlayer.featureEffect
if both properties are set.Known Limitations
- FeatureEffect is not supported in the following scenarios:
- In 3D SceneViews
- In a layer rendered with a HeatmapRenderer
- When FeatureReductionCluster is enabled
- When a map is printed
- A FeatureEffect set on a layerView cannot persisted in a WebMap.
- See also
Examples// gray out features that fall outside of the 3 mile buffer of the mouse's location // by setting feature effect on excluded features layerView.featureEffect = new FeatureEffect({ filter: new FeatureFilter({ geometry: filterGeometry, spatialRelationship: "intersects", distance: 3, units: "miles" }), excludedEffect: "grayscale(100%) opacity(30%)" });
// Apply a drop-shadow feature effect to the features that intersect the borough boundaries, // while applying blur and brightness effects to the features that are excluded from filter criteria. // The resulting map will make it easier to spot if the residents are more likely to experience deprivation // if they live on a borough boundary. const featureFilter = new FeatureFilter({ where: "BoroughEdge='true'" }); layerView.featureEffect = new FeatureEffect({ filter: featureFilter, includedEffect: "drop-shadow(3px, 3px, 3px, black)", excludedEffect: "blur(1px) brightness(65%)" });
- FeatureEffect is not supported in the following scenarios:
-
filter FeatureFilterautocast
-
The attribute, geometry, and time extent filter. Only the features that satisfy the filter are displayed on the view.
- See also
Example// display rain gauges where their water percent is over 30% // and if the gauges are completely contained by the 10-mile // buffer around the filter geometry featureLayerView.filter = new FeatureFilter({ where: "percentile >= 30", geometry: filterPolygon, spatialRelationship: "contains", distance: 10, units: "miles" });
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highlightOptions HighlightOptionsSince: ArcGIS Maps SDK for JavaScript 4.26
-
Options for configuring the highlight. Use the highlight() method on the layer view to highlight a feature. The layerView's
highlightOptions
will take precedence over the view'shighlightOptions
if both properties are set.Known Limitations
- The
highlightOptions
on layer views are only supported in 2D MapView.
Example// Features in the layerview will be highlighted with bright // yellow colors in the map. const layerView = await view.whenLayerView(layer); layerView.highlightOptions = { color: [255, 255, 0, 1], haloOpacity: 0.9, fillOpacity: 0.2 };
- The
-
The layer being viewed.
-
maximumNumberOfFeatures Number
-
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.
Known Limitations
The
maximumNumberOfFeatures
is only supported in 3D SceneViews.
-
maximumNumberOfFeaturesExceeded Boolean
-
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.Known Limitations
The
maximumNumberOfFeaturesExceeded
is only supported in 3D SceneViews.
-
Since: ArcGIS Maps SDK for JavaScript 4.23
-
Indicates if the spatialReference of the MapView is supported by the layer view. When
false
layer view will be suspended.- See also
-
Value is
true
if the layer is suspended (i.e., layer will not redraw or update itself when the extent changes).- See also
-
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. Value of this property is inherited from thelayer.visible
unless the developer overrides it. ThelayerView.visible
will take precedence overlayer.visible
if both properties are set.- Default Value:true
Method Overview
Name | Return Type | Summary | Class |
---|---|---|---|
Adds one or more handles which are to be tied to the lifecycle of the object. more details | Accessor | ||
Query | Creates query parameter object that can be used to fetch aggregate features as they are being displayed. more details | OGCFeatureLayerView | |
Query | Creates a query parameter object that can be used to fetch features as they are being displayed. more details | OGCFeatureLayerView | |
Boolean | Returns true if a named group of handles exist. more details | Accessor | |
Handle | Highlights the given feature(s) in a layer view. more details | OGCFeatureLayerView | |
Boolean |
| LayerView | |
Boolean |
| LayerView | |
Boolean |
| LayerView | |
Promise<FeatureSet> | Executes a Query against aggregate features (i.e. more details | OGCFeatureLayerView | |
Promise<object> | Executes a Query against features available for drawing in the layerView and returns the Extent of features that satisfy the query. more details | OGCFeatureLayerView | |
Promise<number> | Executes a Query against features available for drawing in the layerView and returns the number of features that satisfy the query. more details | OGCFeatureLayerView | |
Promise<FeatureSet> | Executes a Query against features available for drawing in the layerView and returns a FeatureSet. more details | OGCFeatureLayerView | |
Promise<number[]> | Executes a Query against features available for drawing in the layerView and returns array of the ObjectIDs of features that satisfy the input query. more details | OGCFeatureLayerView | |
Removes a group of handles owned by the object. more details | Accessor | ||
Promise |
| LayerView |
Method Details
-
addHandles(handleOrHandles, groupKey)inheritedSince: ArcGIS Maps SDK for JavaScript 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();
ParametershandleOrHandles WatchHandle|WatchHandle[]Handles marked for removal once the object is destroyed.
groupKey *optionalKey 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.
-
createAggregateQuery(){Query}Since: ArcGIS Maps SDK for JavaScript 4.25
-
Creates query parameter object that can be used to fetch aggregate features as they are being displayed. It sets the query parameter's outFields property to
["*"]
and returnGeometry totrue
. The output spatial reference outSpatialReference is set to the spatial reference of the view.ReturnsType Description Query The query parameter object. - See also
-
createQuery(){Query}
-
Creates a 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 totrue
. The output spatial reference outSpatialReference is set to the spatial reference of the view. Parameters of the filter currently applied to the layerview are also incorporated in the returned query object. The results will include geometries of features and values for all fields.ReturnsType Description Query The query object Exampleconst query = csvLayerView.createQuery(); query.where = "magnitude > 4"; csvLayerView.queryFeatures(query).then(function(results) { console.log(results); }) .catch(function(error) { console.log(error); });
-
Since: ArcGIS Maps SDK for JavaScript 4.25
-
Returns true if a named group of handles exist.
ParametergroupKey *optionalA group key.
ReturnsType 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(target){Handle}
-
Highlights the given feature(s) in a layer view. The layerView's highlightOptions will take precedence over the view's
highlightOptions
if both properties are set.Release specific changes:
- At version 4.23, the
highlight()
method was added to ImageryLayerView.
Parameteroptional 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.ReturnsType 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 query result let highlight; view.whenLayerView(treesLayer).then(function(layerView){ layerView.highlightOptions = { color: "#FF00FF", //bright fuschia haloOpacity: 0.8, fillOpacity: 0.3 }; let query = treesLayer.createQuery(); query.where = "type = 'Quercus'"; treesLayer.queryFeatures(query).then(function(result){ 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) { let graphic = response.results.filter(function (result) { return result.graphic.layer === treesLayer; })[0].graphic; view.whenLayerView(graphic.layer).then(function(layerView){ layerView.highlight(graphic); }); } }); });
- At version 4.23, the
-
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.ReturnsType Description Boolean Indicates whether creating an instance of the class has been fulfilled (either resolved or rejected).
-
isRejected()
may be used to verify if creating an instance of the class is rejected. If it is rejected,true
will be returned.ReturnsType Description Boolean Indicates whether creating an instance of the class has been rejected.
-
isResolved()
may be used to verify if creating an instance of the class is resolved. If it is resolved,true
will be returned.ReturnsType Description Boolean Indicates whether creating an instance of the class has been resolved.
-
queryAggregates(query, options){Promise<FeatureSet>}Since: ArcGIS Maps SDK for JavaScript 4.25
-
Executes a Query against aggregate features (i.e. clusters or bins) available for drawing in the layerView and returns a FeatureSet. If query parameters are not provided, all aggregates available for drawing are returned along with their attributes that are available on the client. Fields referenced in statistic queries or in the where clause must first be defined as aggregate fields.
Known Limitations
This method currently does not support spatial queries (i.e. the Query.geometry option and its related properties).
Parametersoptional Autocasts from ObjectSpecifies the parameters of the query. Leave this parameter empty to query all aggregates in the view.
options ObjectoptionalAn object with the following properties.
Specificationsignal AbortSignaloptionalSignal 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.ReturnsType Description Promise<FeatureSet> When resolved, returns a FeatureSet containing an array of aggregate features. Example// clustered point layer const layer = new FeatureLayer({ featureReduction: { type: "cluster" } }); const layerView = await view.whenLayerView(layer); layerView.watch("updating", async (val) => { if(!val){ // wait for the layer view to finish updating const { features } = await layerView.queryAggregates(); // features represents all the clusters in the view } });
-
Executes a Query against features available for drawing in the layerView and returns the Extent of features that satisfy the query.
Known Limitations
- Spatial queries have the same limitations as those listed in the projection engine documentation.
- Spatial queries are not currently supported if the layerView has any of the following SpatialReferences:
- GDM 2000 (4742) – Malaysia
- Gusterberg (Ferro) (8042) – Austria/Czech Republic
- ISN2016 (8086) - Iceland
- SVY21 (4757) - Singapore
Parametersoptional Autocasts from ObjectSpecifies 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 ObjectoptionalAn object with the following properties.
Specificationsignal AbortSignaloptionalSignal 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.ReturnsType 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. Exampleslet layer = new CSVLayer({ url: csvUrl // URL to a csv file }); view.whenLayerView(layer).then(function(layerView){ layerView.watch("updating", function(val){ if(!val){ // wait for the layerView to finish updating layerView.queryExtent().then(function(results){ view.goTo(results.extent); // go to the extent of all the graphics in the layerView }); } }); });
// Expand the extent so that a feature (i.e. point feature) // won't be off screen after the end of goTo animation. layerView.queryExtent() .then(function(result) { const zoomScale = 16000; const extent = result.extent; extent.expand((zoomScale / view.scale) * view.resolution); view.goTo(extent); });
-
Executes a Query against features available for drawing in the layerView 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.
Known Limitations
- Spatial queries have the same limitations as those listed in the projection engine documentation.
- Spatial queries are not currently supported if the layerView has any of the following SpatialReferences:
- GDM 2000 (4742) – Malaysia
- Gusterberg (Ferro) (8042) – Austria/Czech Republic
- ISN2016 (8086) - Iceland
- SVY21 (4757) - Singapore
Parametersoptional Autocasts from ObjectSpecifies 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 ObjectoptionalAn object with the following properties.
Specificationsignal AbortSignaloptionalSignal 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.ReturnsType Description Promise<number> When resolved, returns the number of features satisfying the query. Examplesview.on("click", function(event){ let query = new Query(); query.geometry = event.mapPoint; // obtained from a view click event query.spatialRelationship = "intersects"; view.whenLayerView(layer).then(function(layerView){ reactiveUtils.whenOnce(() => !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 }); }); });
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(query, options){Promise<FeatureSet>}
-
Executes a Query against features available for drawing in the layerView and returns a FeatureSet. If query parameters are not provided, all features available for drawing are returned along with their attributes that are available on the client. For client-side attribute queries, relevant fields should exist in availableFields list for the query to be successful.
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
- Attribute values used in attribute queries executed against layerViews are case sensitive.
- Spatial queries are executed against quantized geometries in the layerView. The resolution of layerView 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 layerView 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
- Gsterberg (Ferro) (8042) – Austria/Czech Republic
- ISN2016 (8086) - Iceland
- SVY21 (4757) - Singapore
Parametersoptional Autocasts from ObjectSpecifies the attributes and spatial filter of the query. When this parameter is not passed to
queryFeatures()
method, all features available for drawing are returned along with their attributes that are available on the client. To only return features visible in the view, set thegeometry
parameter in the query object to the view's extent.options ObjectoptionalAn object with the following properties.
Specificationsignal AbortSignaloptionalSignal 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.ReturnsType Description Promise<FeatureSet> When resolved, a FeatureSet containing an array of graphic features is returned. - See also
Exampleslet layer = new FeatureLayer({ url: fsUrl // points to a Feature Service layer url }); let 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 layerview to finish updating layerView.queryFeatures(query).then(function(results){ console.log(results.features); // prints the array of client-side graphics to the console }); } }); });
let layer = new FeatureLayer({ url: fsUrl // points to a Feature Service layer url }); // returns all the graphics from the layerView view.whenLayerView(layer).then(function(layerView){ layerView.watch("updating", function(val){ if(!val){ // wait for the layerView to finish updating layerView.queryFeatures().then(function(results){ console.log(results.features); // prints all the client-side graphics to the console }); } }); });
layerView.queryFeatures({ geometry: mapPoint, // 6 pixels around a point at the view resolution to query around a finger. distance: view.resolution * 6, });
-
Executes a Query against features available for drawing in the layerView 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.
Known Limitations
- Spatial queries have the same limitations as those listed in the projection engine documentation.
- Spatial queries are not currently supported if the layerView has any of the following SpatialReferences:
- GDM 2000 (4742) – Malaysia
- Gusterberg (Ferro) (8042) – Austria/Czech Republic
- ISN2016 (8086) - Iceland
- SVY21 (4757) - Singapore
Parametersoptional Autocasts from ObjectSpecifies 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 ObjectoptionalAn object with the following properties.
Specificationsignal AbortSignaloptionalSignal 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.ReturnsType Description Promise<number[]> When resolved, returns an array of numbers representing the ObjectIDs of the features satisfying the query. Examplesview.on("click", function(event){ let query = new Query(); query.geometry = event.mapPoint; // obtained from a view click event query.spatialRelationship = "intersects"; view.whenLayerView(layer).then(function(layerView){ reactiveUtils.whenOnce(() => !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 }); }); });
// returns all the Ids from the graphics in the layerView 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(groupKey)inheritedSince: ArcGIS Maps SDK for JavaScript 4.25
-
Removes a group of handles owned by the object.
ParametergroupKey *optionalA group key or an array or collection of group keys to remove.
Exampleobj.removeHandles(); // removes handles from default group obj.removeHandles("handle-group"); obj.removeHandles("other-handle-group");
-
when()
may be leveraged once an instance of the class is created. This method takes two input parameters: acallback
function and anerrback
function. Thecallback
executes when the instance of the class loads. Theerrback
executes if the instance of the class fails to load.Parameterscallback FunctionoptionalThe function to call when the promise resolves.
errback FunctionoptionalThe function to execute when the promise fails.
ReturnsType 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 });