ESM: import GraphicsLayer from "@arcgis/core/layers/GraphicsLayer.js";
CDN: const GraphicsLayer = await $arcgis.import("@arcgis/core/layers/GraphicsLayer.js");
Class: @arcgis/core/layers/GraphicsLayer
Since: ArcGIS Maps SDK for JavaScript 4.0
A GraphicsLayer contains one or more client-side Graphics. Each graphic in the GraphicsLayer is rendered in a LayerView inside either a SceneView or a MapView. The graphics contain discrete vector geometries that represent real-world phenomena.
Unlike FeatureLayer and MapImageLayer, a GraphicsLayer has no schema. Therefore, the graphics that compose a GraphicsLayer may be of more than one geometry type (either points, lines, or polygons). Each graphic must have its own symbol since the GraphicsLayer cannot have an associated renderer. Graphics may also contain different attribute schema from one another.
It is generally preferred to construct a FeatureLayer with its source property when working with client-side graphics. The FeatureLayer performs better with larger datasets and has more capabilities, including rendering, querying, and labeling.
Graphics can be added to an instance of GraphicsLayer in several ways. They may be added via the add() method, directly on the graphics property in the constructor, or after the instance is created. Use Map.add() to add a GraphicsLayer to a Map instance.
const [GraphicsLayer, Graphic] = await $arcgis.import([
"@arcgis/core/layers/GraphicsLayer.js",
"@arcgis/core/Graphic.js"
]);
// Create graphics
let graphicA = new Graphic({ // graphic with line geometry
geometry: new Polyline({...}), // set geometry here
symbol: new SimpleLineSymbol({...}) // set symbol here
});
let graphicB = new Graphic({ // graphic with point geometry
geometry: new Point({...}), // set geometry here
symbol: new SimpleMarkerSymbol({...}) // set symbol here
});
let graphicC = new Graphic({ // graphic with polygon geometry
geometry: new Polygon({...}), // set geometry here
symbol: new SimpleFillSymbol({...}) // set symbol here
});
let graphicD = new Graphic();
let graphicE = new Graphic();
// Add graphic when GraphicsLayer is constructed
let layer = new GraphicsLayer({
graphics: [graphicA]
});
// Add graphic to graphics collection
layer.graphics.add(graphicB);
// Add graphic using add()
layer.add(graphicC);
layer.addMany([graphicD, graphicE]);
// Add graphics using push method graphics collection
layer.graphics.push(graphic1, graphic2);
// Add GraphicsLayer to map
map.add(layer);
The MapView and SceneView each contain a graphics collection that may be used in place of a GraphicsLayer.
new GraphicsLayer(properties)
Parameter
optionalSee the properties for a list of all the properties that may be passed into the constructor.
Show inherited properties Hide inherited properties
Property Details blendMode String
Since: ArcGIS Maps SDK for JavaScript 4.16 GraphicsLayer since 4.0, blendMode added at 4.16.
Blend modes are used to blend layers together to create an interesting effect in a layer, or even to produce what seems like a new layer. Unlike the method of using transparency which can result in a washed-out top layer, blend modes can create a variety of very vibrant and intriguing results by blending a layer with the layer(s) below it.
When blending layers, a top layer is a layer that has a blend mode applied. All layers underneath the top layer are background layers. The default blending mode is normal where the top layer is simply displayed over the background layer. While this default behavior is perfectly acceptable, the use of blend modes on layers open up a world of endless possibilities to generate creative maps.
The layers in a GroupLayer are blended together in isolation from the rest of the map.
In the following screenshots, the vintage shaded relief layer is displayed over a firefly world imagery layer. The color blend mode is applied to the vintage shaded relief and the result looks like a new layer.
The following factors will affect the blend result:
average blend mode is often similar to the effect of setting the layer's opacity to 50%.
Lighten blend modes:
The following blend modes create lighter results than all layers. In lighten blend modes, pure black colors in the top layer become transparent allowing the background layer to show through. White in the top layer will stay unchanged. Any color that is lighter than pure black is going to lighten colors in the top layer to varying degrees all way to pure white.
Lighten blend modes can be useful when lightening dark colors of the top layer or removing black colors from the result. The plus, lighten and screen modes can be used to brighten layers that have faded or dark colors on a dark background.
darken blend mode. lighter Colors in top and background layers are multiplied by their alphas (layer opacity and layer's data opacity. Then the resulting colors are added together. All overlapping midrange colors are lightened in the top layer. The opacity of layer and layer's data will affect the blend result. plus Colors in top and background layers are added together. All overlapping midrange colors are lightened in the top layer. This mode is also known as add or linear-dodge. screen Multiplies inverted colors in top and background layers then inverts the colors again. The resulting colors will be lighter than the original color with less contrast. Screen can produce many different levels of brightening depending on the luminosity values of the top layer. Can be thought of as the opposite of the multiply mode. color-dodge Divides colors in background layer by the inverted top layer. This lightens the background layer depending on the value of the top layer. The brighter the top layer, the more its color affects the background layer. Decreases the contrast between top and background layers resulting in saturated mid-tones and blown highlights.
Darken blend modes:
The following blend modes create darker results than all layers. In darken blend modes, pure white in the top layer will become transparent allowing the background layer to show through. Black in the top layer will stay unchanged. Any color that is darker than pure white is going to darken a top layer to varying degrees all the way to pure black.
The multiply blend mode is often used to highlight shadows, show contrast, or accentuate an aspect of a map. For example, you can use multiply blend mode on a topographic map displayed over hillshade when you want to have your elevation show through the topographic layer. See the intro to layer blending sample.
The multiply and darken modes can be used to have dark labels of the basemap to show through top layers. See the darken blending sample.
The color-burn mode works well with colorful top and background layers since it increases saturation in mid-tones. It increases the contrast by tinting pixels in overlapping areas in top and bottom layers more towards the top layer color. Use this blend mode, when you want an effect with more contrast than multiply or darken.
The following screenshots show how the multiply blend mode used for creating a physical map of the world that shows both boundaries and elevation.
Contrast blend modes:
The following blend modes create contrast by both lightening the lighter areas and darkening the darker areas in the top layer by using lightening or darkening blend modes to create the blend. The contrast blend modes will lighten the colors lighter than 50% gray ([128,128,128]), and darken the colors darker than 50% gray. 50% gray will be transparent in the top layer. Each mode can create a variety of results depending on the colors of top and background layers being blended together. The overlay blend mode makes its calculations based on the brightness of the colors in the background layer while all of the other contrast blend modes make their calculations based on the brightness of the top layer. Some of these modes are designed to simulate the effect of shining a light through the top layer, effectively projecting upon the layers beneath it.
Contrast blend modes can be used to increase the contrast and saturation to have more vibrant colors and give a punch to your layers. For example, you can duplicate a layer and set overlay blend mode on the top layer to increase the contrast and tones of your layer. You can also add a polygon layer with a white fill symbol over a dark imagery layer and apply soft-light blend mode to increase the brightness in the imagery layer.
The following screenshots show an effect of the overlay blend mode on a GraphicsLayer. The left image shows when the buffer graphics layer has the normal blend mode. As you can see, the gray color for the buffer polygon is blocking the intersecting census tracts. The right image shows when the overlay blend mode is applied to the buffer graphics layer. The overlay blend mode darkens or lightens the gray buffer polygon depending on the colors of the background layer while the census tracts layer is shining through. See this in action.
multiply and screen modes to darken and lighten colors in the top layer with the background layer always shining through. The result is darker color values in the background layer intensify the top layer, while lighter colors in the background layer wash out overlapping areas in the top layer. soft-light Applies a half strength screen mode to lighter areas and half strength multiply mode to darken areas of the top layer. You can think of the soft-light as a softer version of the overlay mode. hard-light Multiplies or screens the colors, depending on colors of the top layer. The effect is similar to shining a harsh spotlight on the top layer. vivid-light Uses a combination of color-burn or color-dodge by increasing or decreasing the contrast, depending on colors in the top layer.
Component blend modes:
The following blend modes use primary color components, which are hue, saturation and luminosity to blend top and background layers. You can add a feature layer with a simple renderer over any layer and set hue, saturation, color or luminosity blend mode on this layer. With this technique, you create a brand new looking map.
The following screenshots show where the topo layer is blended with world hillshade layer with luminosity blend mode. The result is a drastically different looking map which preserves the brightness of the topo layer while adapting the hue and saturation of the hillshade layer.
color blend mode. color Creates an effect with the hue and saturation of the top layer and the luminosity of the background layer. Can be thought of as the opposite of luminosity blend mode.
Composite blend modes:
The following blend modes can be used to mask the contents of top, background or both layers.
Destination modes are used to mask the data of the top layer with the data of the background layer.Source modes are used to mask the data of the background layer with the data of the top layer.The destination-in blend mode can be used to show areas of focus such as earthquakes, animal migration, or point-source pollution by revealing the underlying map, providing a bird's eye view of the phenomenon. Check out multiple blending and groupLayer blending samples to see composite blend modes in action.
The following screenshots show feature and imagery layers on the left side on their own in the order they are drawn in the view. The imagery layer that contains land cover classification rasters. The feature layer contains 2007 county crops data. The right image shows the result of layer blending where destination-in blendMode is set on the imagery layer. As you can see, the effect is very different from the original layers. The blended result shows areas of cultivated crops only (where both imagery and feature layers overlap).
Invert blend modes:
The following blend modes either invert or cancel out colors depending on colors of the background layer. These blend modes look for variations between top and background layers. For example, you can use difference or exclusion blend modes on two imagery layers of forest covers to visualize how forest covers changed from one year to another.
The invert blend mode can be used to turn any light basemap into a dark basemap to accommodate those who work in low-light conditions. The following screenshots show how setting the invert blend mode set on a feature layer with a simple renderer turns the world terrain basemap into a dark themed basemap in no time.
difference blend mode, except that the resulting image is lighter overall. Overlapping areas with lighter color values are lightened, while darker overlapping color values become transparent. minus Subtracts colors of the top layer from colors of the background layer making the blend result darker. In the case of negative values, black is displayed. invert Inverts the background colors wherever the top and background layers overlap. The invert blend mode inverts the layer similar to a photographic negative. reflect This blend mode creates effects as if you added shiny objects or areas of light in the layer. Black pixels in the background layer are ignored as if they were transparent.
Possible Values:"average" |"color-burn" |"color-dodge" |"color" |"darken" |"destination-atop" |"destination-in" |"destination-out" |"destination-over" |"difference" |"exclusion" |"hard-light" |"hue" |"invert" |"lighten" |"lighter" |"luminosity" |"minus" |"multiply" |"normal" |"overlay" |"plus" |"reflect" |"saturation" |"screen" |"soft-light" |"source-atop" |"source-in" |"source-out" |"vivid-light" |"xor"
Inherited
Property declaredClass Stringreadonly
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.
Since: ArcGIS Maps SDK for JavaScript 4.18 GraphicsLayer since 4.0, effect added at 4.18.
Effect provides various filter functions that can be performed on the layer to achieve different visual effects similar to how image filters work. This powerful capability allows you to apply css filter-like functions to layers to create custom visual effects to enhance the cartographic quality of your maps. This is done by applying the desired effect to the layer's effect property as a string or an array of objects to set scale dependent effects.
Notes
featureEffect, effect, opacity and blendMode.Known Limitations
cluster enabled.Examples
// the following effect will be applied to the layer at all scales
// brightness will be applied first, then hue-rotate followed by contrast
// changing order of the effects will change the final result
layer.effect = "brightness(5) hue-rotate(270deg) contrast(200%)";// set a scale dependent bloom effect on the layer
layer.effect = [
{
scale: 36978595,
value: "drop-shadow(3px, 3px, 4px)"
},
{
scale: 18489297,
value: "drop-shadow(2px, 2px, 3px)"
},
{
scale: 4622324,
value: "drop-shadow(1px, 1px, 2px)"
}
];Specifies how graphics are placed on the vertical axis (z). This property may only be used in a SceneView. See the ElevationInfo sample for an example of how this property may be used.
If the elevation info is not specified, the effective elevation depends on the context and could vary per graphic.
Defines how the feature is placed with respect to the terrain surface or 3D objects in the scene. If the geometry consists of multiple points (e.g. lines or polygons), the elevation is evaluated separately for each point. See the table below for a list of possible values.
Mode Description on-the-ground Features are aligned to the Ground. If the scene contains an IntegratedMeshLayer or IntegratedMesh3DTilesLayer, then features are aligned to the IntegratedMeshLayer or IntegratedMesh3DTilesLayer. If features have z-values, then the z-values are ignored in this mode. Features with 2D symbols are draped on the Ground or IntegratedMeshLayer or IntegratedMesh3DTilesLayer. This is the default mode for layers without z-values containing Polyline, Polygon features or Point features rendered with ObjectSymbol3DLayer. absolute-height Features are placed at an absolute elevation (z-value) above sea level. This z-value is determined by the geometry's z-value (if present). IffeatureExpressionInfo is defined, the result of the expression is used instead of the geometry's z-value. This mode doesn't take the elevation of the Ground or any other layers into account. This is the default value of features with any geometry type where hasZ is true. relative-to-ground Features are placed at an elevation relative to the Ground or IntegratedMeshLayer or IntegratedMesh3DTilesLayer. The feature's elevation is determined by summing up the elevation of the Ground or IntegratedMeshLayer or IntegratedMesh3DTilesLayer and the geometry's z-value (if present). If featureExpressionInfo is defined, the result of the expression is used instead of the geometry's z-value. If the geometries don't have z-values, relative-to-ground is the default value for Point geometries rendered with IconSymbol3DLayers. relative-to-scene Features are aligned to extruded polygons, meshes, 3D Object SceneLayers or BuildingSceneLayers, depending on which one has higher elevation. If the feature is not directly above a building or any other feature, it is aligned to the elevation of the Ground or the IntegratedMeshLayer or IntegratedMesh3DTilesLayer. If present, the geometry's z-value is added to the elevation. If featureExpressionInfo is defined, the result of the expression is used instead of the geometry's z-value.
Possible Values:"on-the-ground"|"relative-to-ground"|"absolute-height"|"relative-to-scene"
offset Number|null|undefinedAn elevation offset, which is added to the vertical position of the graphic. If unit is not defined, the offset is in meters. When mode = "on-the-ground", this property has no effect.
Defines how to override a feature's Z-value based on its attributes.
Title of the expression.
expression StringAn Arcade expression following the specification defined by the Arcade Feature Z Profile. Expressions may reference field values using the $feature profile variable and must return a number representing the z-value of the feature. When mode = "on-the-ground", this property has no effect. For line and polygon geometries the result of the expression is the same for all vertices of a feature.
The unit for featureExpressionInfo and offset values.
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;
});Example
// Add graphics to GraphicsLayer directly as an array
layer.graphics = [graphicA, graphicB];
// Add graphics to layer via Collection
layer.graphics.addMany([graphicC, graphicD]);
// Add graphics to layer via Collection
layer.graphics.push(graphicC, graphicD);Inherited
Property id String
The unique ID assigned to the layer. If not set by the developer, it is automatically generated when the layer is loaded.
Inherited
Property listMode String
Indicates how the layer should display in the LayerList widget. The possible values are listed below.
Possible Values:"show" |"hide" |"hide-children"
The Error object returned if an error occurred while loading.
Inherited
Property loadStatus Stringreadonly
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"
Inherited
Property loadWarnings Object[]readonly
A list of warnings which occurred while loading.
loaded Booleanreadonly
Indicates whether the layer instance has loaded. When true, all the properties of the object can be accessed.
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.
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 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.
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;Inherited
Property opacity Number
The opacity of the layer. This value can range between 1 and 0, where 0 is 100 percent transparent and 1 is completely opaque.
Example
// Makes the layer 50% transparent
layer.opacity = 0.5;Since: ArcGIS Maps SDK for JavaScript 4.27 Layer since 4.0, parent added at 4.27.
The parent to which the layer belongs.
Inherited
Property persistenceEnabled Booleanreadonly
Since: ArcGIS Maps SDK for JavaScript 4.28 Layer since 4.0, persistenceEnabled added at 4.28.
When true, the layer can be persisted. This property only has an effect for layers that are part of the WebMap or WebScene spec.
screenSizePerspectiveEnabled Boolean
Since: ArcGIS Maps SDK for JavaScript 4.4 GraphicsLayer since 4.0, screenSizePerspectiveEnabled added at 4.4.
Apply perspective scaling to screen-size point symbols in a SceneView. When true, screen sized objects such as icons, labels or callouts integrate better in the 3D scene by applying a certain perspective projection to the sizing of features. This only applies when using a SceneView.
layer.screenSizePerspectiveEnabled = true
layer.screenSizePerspectiveEnabled = false
Known Limitations
Screen size perspective is currently not optimized for situations where the camera is very near the ground, or for scenes with point features located far from the ground surface. In these cases it may be better to turn off screen size perspective.
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.
Inherited
Property uid Stringreadonly
Since: ArcGIS Maps SDK for JavaScript 4.33 Layer since 4.0, uid added at 4.33.
An automatically generated unique identifier assigned to the instance. The unique id is generated each time the application is loaded.
Since: ArcGIS Maps SDK for JavaScript 4.30 Layer since 4.0, visibilityTimeExtent added at 4.30.
Specifies a fixed time extent during which a layer should be visible. This property can be used to configure a layer that does not have time values stored in an attribute field to work with time. Once configured, the TimeSlider widget will display the layer within the set time extent. In the case that only one of the start or end date values are available, the layer remains visible indefinitely in the direction where there is no time value.
Aerial imagery can capture seasonal variations in vegetation, water bodies, and land use patterns. For example, in agricultural regions, aerial imageries taken during different growing seasons provide insights into crop health and productivity. Defining a fixed time extent on imageries from specific time periods provides temporal context and facilitates focused analysis based on specific time periods or events.
Inherited
Property visible Boolean
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.
Example
// The layer is no longer visible in the view
layer.visible = false;
// Watch for changes in the layer's visibility
// and set the visibility of another layer when it changes
reactiveUtils.watch(
() => layer.visible,
(visible) => {
if (visible) {
anotherLayer.visible = true;
} else {
anotherLayer.visible = false;
}
}
);Show inherited methods Hide inherited methods
Method DetailsInherited
Method addHandles(handleOrHandles, groupKey)
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
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.
Inherited
Method cancelLoad()
Cancels a load() operation if it is already in progress.
Inherited
Method createLayerView(view, options){Promise<LayerView>}
Called by the views, such as MapView and SceneView, when the layer is added to the Map.layers collection and a layer view must be created for it. This method is used internally and there is no use case for invoking it directly.
Parameters
view *
The parent view.
optionalAn object specifying additional options. See the object specification table below for the required properties of this object.
Returns
Inherited
Method destroy()
Since: ArcGIS Maps SDK for JavaScript 4.17 Layer since 4.0, destroy added at 4.17.
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.
Inherited
Method emit(type, event){Boolean}
Since: ArcGIS Maps SDK for JavaScript 4.5 Layer since 4.0, emit added at 4.5.
Emits an event on the instance. This method should only be used when creating subclasses of this class.
Parameters
The name of the event.
optionalThe event payload.
Returns
Type Description Booleantrue if a listener was notified
Inherited
Method hasEventListener(type){Boolean}
Indicates whether there is an event listener on the instance that matches the provided event name.
Returns
Type Description Boolean Returns true if the class supports the input event.Inherited
Method hasHandles(groupKey){Boolean}
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 *
optionalA group key.
Returns
Type Description Boolean Returnstrue 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");
}Inherited
Method isFulfilled(){Boolean}
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).Inherited
Method isRejected(){Boolean}
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.Inherited
Method isResolved(){Boolean}
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.Inherited
Method load(options){Promise}
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.
Parameters
optionalAdditional options.
Specification
optionalSignal 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.Inherited
Method on(type, listener){Object}
Registers an event handler on the instance. Call this method to hook an event with a listener.
Returns
Type Description Object Returns an event handler with aremove() 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);
});Inherited
Method removeHandles(groupKey)
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 *
optionalA 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");Inherited
Method when(callback, errback){Promise}
Since: ArcGIS Maps SDK for JavaScript 4.6 Layer 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
optionalThe function to call when the promise resolves.
optionalThe function to execute when the promise fails.
Returns
Type Description Promise Returns a new promise for the result ofcallback 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
});Show inherited events Hide inherited events
Event DetailsInherited
Event layerview-create
Fires after the layer's LayerView is created and rendered in a view.
The view in which the layerView was created.
The LayerView rendered in the view representing the layer in layer.
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;
});Inherited
Event layerview-create-error
Fires when an error emits during the creation of a LayerView after a layer has been added to the map.
The view that failed to create a layerview for the layer emitting this event.
An error object describing why the layer view failed to create.
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);
});Inherited
Event layerview-destroy
Fires after the layer's LayerView is destroyed and no longer renders in a view.
The view in which the layerView was destroyed.
The destroyed LayerView representing the layer.
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