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FocusAreas | API Reference | ArcGIS Maps SDK for JavaScript 4.33

ESM: import FocusAreas from "@arcgis/core/effects/FocusAreas.js";

CDN: const FocusAreas = await $arcgis.import("@arcgis/core/effects/FocusAreas.js");

Class: @arcgis/core/effects/FocusAreas

Since: ArcGIS Maps SDK for JavaScript 4.33

A collection of focus areas in a Map.

A focus area highlights a region of the map by de-emphasizing parts outside the area of interest. Two predefined styles, dark or bright are available, to choose a visualization with good contrast for scenes with different coloring. A focus area can have a colored outline, which is helpful to distinguish different focus areas in a map. Focus areas can be captured in slides and shared as part of a webscene.

Known Limitations

• Focus areas are only supported in SceneView.

See also

• Sample - Focus Area

• FocusArea
• Map

Example

// Adding a focus area to map.
const focusAreaPolygon = new Polygon({
 spatialReference: { wkid: 102100 },
 rings: [[
  [1288603, 6130075],
  [1288415, 6130021],
  [1288459, 6130133],
  [1288603, 6130075],
 ]],
});

const focusArea = new FocusArea({
 outline: { color: [255, 128, 128, 0.55] },
 geometries: new Collection([focusAreaPolygon]),
});

map.focusAreas.areas.add(focusArea);
map.focusAreas.style = "dark";

FocusAreas Constructor new FocusAreas(properties)

Parameter

optional

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

Show inherited properties Hide inherited properties

A collection containing all focus areas.

declaredClass

Inherited

Property declaredClass Stringreadonly

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

The rendering style of the map, applied outside of all enabled focus areas.

This property can be either "bright" or "dark", with the default value set to "bright". When there is no enabled focus area on the map, the view renders normally.

Possible Values:"bright" |"dark"

Show inherited methods Hide inherited methods

addHandles

Inherited

Method addHandles(handleOrHandles, groupKey)

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 *

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.

clone Method clone(){this}

Creates a deep clone of this object. Any properties that store values by reference will be assigned copies of the referenced values on the cloned instance.

Returns

Type Description this A deep clone of the class instance that invoked this method.

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. The object passed into the input json parameter often comes from a response to a query operation in the REST API or a toJSON() method from another ArcGIS product. See the Using fromJSON() topic in the Guide for details and examples of when and how to use this function.

Returns

Type Description * | null | undefined Returns a new instance of this class.

hasHandles

Inherited

Method hasHandles(groupKey){Boolean}

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");
}

removeHandles

Inherited

Method removeHandles(groupKey)

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");

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