ListItem

AMD: require(["esri/widgets/LayerList/ListItem"], (LayerListItem) => { /* code goes here */ });
ESM: import LayerListItem from "@arcgis/core/widgets/LayerList/ListItem.js";
Class: esri/widgets/LayerList/ListItem
Inheritance: ListItemAccessor
Since: ArcGIS Maps SDK for JavaScript 4.2

The ListItem class represents one of the operationalItems in the LayerListViewModel. In the LayerList widget UI, the list item represents a layer displayed in the view. It provides access to the associated layer's properties, allows the developer to configure actions related to the layer, and allows the developer to add content to the item related to the layer.

To hide list items in the LayerList widget, you must set the listMode property on the desired layers to hide. You cannot hide list items using this class or the LayerList class.

See also

Property Overview

Any properties can be set, retrieved or listened to. See the Watch for changes topic.
Show inherited properties Hide inherited properties
Name Type Summary Class

Whether the actions panel is open in the LayerList.

ListItem

A nested 2-dimensional collection of actions that could be triggered on the item.

ListItem

When a layer contains sublayers, this property is a Collection of ListItem objects belonging to the given layer.

ListItem

Indicates if the children of a list item (or sublayers in a GroupLayer) can be sorted or moved/reordered.

ListItem

Only valid when the list item represents a StreamLayer.

ListItem

The name of the class.

Accessor

The Error object returned if an error occurred.

ListItem

When true, hides the layer from the LayerList instance.

ListItem

Whether the layer is unsupported by the view.

ListItem

The layer associated with the triggered action.

ListItem

The LayerView displaying data for the associated layer.

ListItem

Specifies whether to ignore the listMode property of the child layers in the list item.

ListItem

Whether the layer is open in the LayerList.

ListItem

Allows you to display custom content for each ListItem in the LayerList widget.

ListItem

The parent of this item

ListItem

Value is true when the layer is being published.

ListItem

Indicates if the list item (or layer in the map) can be sorted or moved/reordered.

ListItem

The title of the layer.

ListItem

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

ListItem

The view from which the widget will operate.

ListItem

Indicates how to manage the visibility of the children layers.

ListItem

Indicates if the ListItem is visible.

ListItem

Whether the layer is visible at the current scale or not.

ListItem

Whether the layer is visible at the current time extent or not.

ListItem

Property Details

actionsOpen

Property
actionsOpen Boolean

Whether the actions panel is open in the LayerList.

Default Value:false

actionsSections

Property
actionsSections Collection<Collection<(ActionButton|ActionToggle)>>autocast
Autocasts from Object[][]

A nested 2-dimensional collection of actions that could be triggered on the item.

children

Property
children Collection<ListItem>autocast

When a layer contains sublayers, this property is a Collection of ListItem objects belonging to the given layer.

childrenSortable

Property
childrenSortable Boolean
Since: ArcGIS Maps SDK for JavaScript 4.16

Indicates if the children of a list item (or sublayers in a GroupLayer) can be sorted or moved/reordered.

Default Value:true
Example
// disables the children of a parent list item from being sorted
listItem.childrenSortable = false;

connectionStatus

Property
connectionStatus String |null |undefinedreadonly
Since: ArcGIS Maps SDK for JavaScript 4.24

Only valid when the list item represents a StreamLayer. Indicates the connectionStatus of the stream layer connection. This overrides the updating property.

Starting at version 4.27, a green beacon icon will appear next to the list item title when a stream layer is connected. Prior to version 4.27, when a stream layer is connected a green calcite check-circle icon will appear next to the list item title.

When a stream layer is disconnected an orange calcite offline icon will display next to the list item title.

Starting at version 4.26, the connectionStatus can be paused. This also results in displaying an orange offline icon next to the list item title.

Possible Values:"connected" |"disconnected" |"paused"

declaredClass

Inherited
Property
declaredClass Stringreadonly
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.7

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

error

Property
error Error |null |undefinedreadonly

The Error object returned if an error occurred.

hidden

Property
hidden Boolean
Since: ArcGIS Maps SDK for JavaScript 4.24

When true, hides the layer from the LayerList instance. This is an alternative to Layer.listMode, which hides a layer from all instances of LayerList that include the layer.

Default Value:false
Example
let layerList1 = new LayerList({
  view,
  container: layerList1Container,
  listItemCreatedFunction: (event) => {
    // hides the USA - Highway layer from the
    // layerList1 instance of layerlist
    if(event.item.title === "USA - Highways") {
      event.item.hidden = true;
    }
  }
});

incompatible

Property
incompatible Booleanreadonly
Since: ArcGIS Maps SDK for JavaScript 4.32

Whether the layer is unsupported by the view.

Default Value:false

The layer associated with the triggered action.

Default Value:null

layerView

Property
layerView LayerView |null |undefinedreadonly

The LayerView displaying data for the associated layer.

listModeDisabled

Property
listModeDisabled Boolean
Since: ArcGIS Maps SDK for JavaScript 4.30

Specifies whether to ignore the listMode property of the child layers in the list item. A common use case for listModeDisabled is when you want to use the LayerList or BasemapLayerList to manage and configure a layer's listMode value.

Default Value:false
See also

open

Property
open Boolean

Whether the layer is open in the LayerList.

Default Value:false

panel

Property
panel ListItemPanelautocast
Since: ArcGIS Maps SDK for JavaScript 4.7

Allows you to display custom content for each ListItem in the LayerList widget.

A common scenario for using ListItemPanel is to display a Legend widget within each list item. The legend keyword can be used in the content property of the panel to display a legend for each layer in the LayerList.

Examples
// displays the legend for each layer list item
const layerList = new LayerList({
  view: view,
  listItemCreatedFunction: function(event){
    const item = event.item;
    item.panel = {
      content: "legend"
    };
  }
});
// displays content from the DOM in the LayerList
const layerList = new LayerList({
  view: view,
  listItemCreatedFunction: function(event){
    const item = event.item;
    item.panel = {
      content: document.getElementById("myDiv"),
      className: "esri-icon-chart",
      open: item.visible
    };
  }
});

parent

Property
parent ListItem |null |undefined
Since: ArcGIS Maps SDK for JavaScript 4.5

The parent of this item

Default Value:null

publishing

Property
publishing Booleanreadonly
Since: ArcGIS Maps SDK for JavaScript 4.25

Value is true when the layer is being published. Value will be false if the layer is not being published or checkPublishStatusEnabled is false.

Default Value:false

sortable

Property
sortable Boolean
Since: ArcGIS Maps SDK for JavaScript 4.16

Indicates if the list item (or layer in the map) can be sorted or moved/reordered.

Default Value:true
Example
// disables the list item from being sorted
listItem.sortable = false;

title

Property
title String

The title of the layer.

updating

Property
updating Booleanreadonly

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

Default Value:false

view

Property
view MapView |SceneView |null |undefined

The view from which the widget will operate.

visibilityMode

Property
visibilityMode Stringreadonly

Indicates how to manage the visibility of the children layers.

visible

Property
visible Boolean

Indicates if the ListItem is visible.

Default Value:true

visibleAtCurrentScale

Property
visibleAtCurrentScale Booleanreadonly

Whether the layer is visible at the current scale or not.

Default Value:true

visibleAtCurrentTimeExtent

Property
visibleAtCurrentTimeExtent Booleanreadonly
Since: ArcGIS Maps SDK for JavaScript 4.30

Whether the layer is visible at the current time extent or not.

Default Value:true

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

Creates a deep clone of this object.

ListItem

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

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.

clone

Method
clone(){ListItem}

Creates a deep clone of this object.

Returns
Type Description
ListItem A clone of the new ListItem instance.

hasHandles

Inherited
Method
hasHandles(groupKey){Boolean}
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 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

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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