LegendViewModel

AMD: require(["esri/widgets/Legend/LegendViewModel"], (LegendVM) => { /* code goes here */ });
ESM: import LegendVM from "@arcgis/core/widgets/Legend/LegendViewModel.js";
Class: esri/widgets/Legend/LegendViewModel
Inheritance: LegendViewModel Accessor
Since: ArcGIS Maps SDK for JavaScript 4.11

Provides the logic for the Legend widget, which displays a label and symbol for interpreting the Renderer of each layer in a map. This class may be used to create custom, interactive Legend widgets.

See also
Example
const legend = new Legend({
  view: view,
  viewModel: new LegendViewModel({
    view: view
  })
});
view.ui.add(legend, "bottom-left");

Constructors

LegendViewModel

Constructor
new LegendViewModel(properties)
Parameter
properties Object
optional

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

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
Show inherited properties Hide inherited properties
Name Type Summary Class

Collection of ActiveLayerInfo objects used by the legend view to display data in the legend.

LegendViewModel

Indicates whether to show the Basemap layers in the Legend.

LegendViewModel

The name of the class.

Accessor

When true, layers will only be shown in the legend if they are visible in the view's extent.

LegendViewModel

Specifies a subset of the layers in the map to display in the legend.

LegendViewModel

Determines whether to respect the properties of the layers in the map that control the legend's visibility (minScale, maxScale, legendEnabled).

LegendViewModel

The view model's state.

LegendViewModel

The view from which the widget will operate.

LegendViewModel

Property Details

activeLayerInfos

Property
activeLayerInfos Collection<ActiveLayerInfo>autocast
Autocasts from Object[]

Collection of ActiveLayerInfo objects used by the legend view to display data in the legend. Use this property to hide or display the layer's symbols in the legend when an ActiveLayerInfo is removed from or added to this collection.

basemapLegendVisible

Property
basemapLegendVisible Boolean

Indicates whether to show the Basemap layers in the Legend.

Default Value:filterBasemaps
Example
legend.viewModel.basemapLegendVisible = true;

declaredClass

Inherited
Property
declaredClass Stringreadonly
Inherited from Accessor

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

hideLayersNotInCurrentView

Property
hideLayersNotInCurrentView Boolean
Since: ArcGIS Maps SDK for JavaScript 4.21 LegendViewModel since 4.11, hideLayersNotInCurrentView added at 4.21.

When true, layers will only be shown in the legend if they are visible in the view's extent. When data from a layer is not visible in the view, the layer's legend information will be hidden.

To hide layers completely from the legend, you should set the legendEnabled property of the layer to false.

Default Value:false
See also
Example
// layers not displayed in the view
// will not be shown in the legend
legend.viewModel.hideLayersNotInCurrentView = true;

layerInfos

Property
layerInfos Object[]

Specifies a subset of the layers in the map to display in the legend. If this property is not set, all operational layers in the map will display in the legend. This property can be used to control layer display order in the legend. Objects in this array are defined with the properties listed below.

Properties
title String
optional

Specify a title for the layer. If no title is specified the service name is used.

layer Layer
optional

A layer to add to the legend.

respectLayerVisibility

Property
respectLayerVisibility Boolean
Since: ArcGIS Maps SDK for JavaScript 4.13 LegendViewModel since 4.11, respectLayerVisibility added at 4.13.

Determines whether to respect the properties of the layers in the map that control the legend's visibility (minScale, maxScale, legendEnabled). By default, a layer's legend elements will not render in the legend given the following conditions:

  • The layer's legendEnabled property is set to false.
  • If the view's scale is outside the visibility range defined by the layer's minScale and maxScale properties.

When the respectLayerVisibility property of the legend is set to false, the legend elements for each layer in the map will always display, thus disregarding the minScale, maxScale, and legendEnabled properties for each layer in the map.

Default Value:true
See also
Example
// Always displays legend elements for the map's layers
// regardless of their minScale, maxScale, and legendEnabled properties
legend.respectLayerVisibility = false;

state

Property
state Stringreadonly

The view model's state.

Possible Values:"ready" |"disabled"

Default Value:disabled

view

Property
view MapView |SceneView

The view from which the widget will operate.

Method Overview

Show inherited methods Hide inherited methods
Name Return Type Summary Class

Adds one or more handles which are to be tied to the lifecycle of the object.

Accessor

Returns true if a named group of handles exist.

Accessor

Removes a group of handles owned by the object.

Accessor

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.

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");
}

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");

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