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Showing content from https://developers.arcgis.com/javascript/latest/api-reference/esri-widgets-Widget.html below:

Widget | API Reference | ArcGIS Maps SDK for JavaScript 4.33

ESM: import Widget from "@arcgis/core/widgets/Widget.js";

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

Class: @arcgis/core/widgets/Widget

Subclasses: AreaMeasurement2D , AreaMeasurement3D , Attachments , Attribution , BasemapGallery , BasemapLayerList , BasemapToggle , BatchAttributeForm , Bookmarks , BuildingExplorer , ButtonMenu , CatalogLayerList , Compass , CoordinateConversion , Daylight , DirectLineMeasurement3D , DirectionalPad , Directions , DistanceMeasurement2D , Editor , ElevationProfile , Expand , Feature , FeatureForm , FeatureTable , FeatureTemplates , Features , FloorFilter , Fullscreen , GridControls , HeatmapSlider , Histogram , HistogramRangeSlider , Home , LayerList , Legend , LineOfSight , ListItemPanel , ListItemPanel , Locate , Measurement , NavigationToggle , OrientedImageryViewer , Popup , Print , ScaleBar , ScaleRangeSlider , Search , SearchResultRenderer , ShadowCast , Sketch , Slice , Slider , SmartMappingSliderBase , SnappingControls , Swipe , TableList , TimeSlider , TimeZoneLabel , Track , UtilityNetworkAssociations , UtilityNetworkTrace , UtilityNetworkValidateTopology , ValuePicker , VideoPlayer , Weather , Zoom

Since: ArcGIS Maps SDK for JavaScript 4.2

Property Overview Any properties can be set, retrieved or listened to. See the Watch for changes topic.

Show inherited properties Hide inherited properties

Property Details

The ID or node representing the DOM element containing the widget. This property can only be set once. The following examples are all valid use case when working with widgets.

Examples

// Create the HTML div element programmatically at runtime and set to the widget's container
const basemapGallery = new BasemapGallery({
  view: view,
  container: document.createElement("div")
});

// Add the widget to the top-right corner of the view
view.ui.add(basemapGallery, {
  position: "top-right"
});

// Specify an already-defined HTML div element in the widget's container

const basemapGallery = new BasemapGallery({
  view: view,
  container: basemapGalleryDiv
});

// Add the widget to the top-right corner of the view
view.ui.add(basemapGallery, {
  position: "top-right"
});

// HTML markup
<body>
  <div id="viewDiv"></div>
  <div id="basemapGalleryDiv"></div>
</body>

// Specify the widget while adding to the view's UI
const basemapGallery = new BasemapGallery({
  view: view
});

// Add the widget to the top-right corner of the view
view.ui.add(basemapGallery, {
  position: "top-right"
});

declaredClass 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 4.27 Widget since 4.2, icon added at 4.27.: Icon which represents the widget. It is typically used when the widget is controlled by another one (e.g. in the Expand widget).

: The unique ID assigned to the widget when the widget is created. If not set by the developer, it will default to the container ID, or if that is not present then it will be automatically generated.

Since: ArcGIS Maps SDK for JavaScript 4.11 Widget since 4.2, label added at 4.11.

The widget's label.

This property is useful whenever the widget is controlled by another one (e.g. Expand)

Indicates whether the widget is visible.

If false, the widget will no longer be rendered in the web document. This may affect the layout of other elements or widgets in the document. For example, if this widget is the first of three widgets associated to the upper right hand corner of the view UI, then the other widgets will reposition when this widget is made invisible. For more information, refer to the css display value of "none".

Example

// Hides the widget in the view
widget.visible = false;

Method Overview

Show inherited methods Hide inherited methods

Name Return Type Summary Class addHandles()

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

Accessor classes() String

A utility method used for building the value for a widget's class property.

Widget destroy()

Destroys the widget instance.

Widget emit() Boolean

Emits an event on the instance.

Widget hasEventListener() Boolean

Indicates whether there is an event listener on the instance that matches the provided event name.

Widget hasHandles() Boolean

Returns true if a named group of handles exist.

Accessor isFulfilled() Boolean

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).

Widget isRejected() Boolean

isRejected() may be used to verify if creating an instance of the class is rejected.

Widget isResolved() Boolean

isResolved() may be used to verify if creating an instance of the class is resolved.

Widget on() Object

Registers an event handler on the instance.

Widget postInitialize()

Executes after widget is ready for rendering.

Widget removeHandles()

Removes a group of handles owned by the object.

Accessor render() Object

This method is implemented by subclasses for rendering.

Widget renderNow()

Renders widget to the DOM immediately.

Widget scheduleRender()

Schedules widget rendering.

Widget when() Promise

when() may be leveraged once an instance of the class is created.

Widget Method Details

addHandles Inherited 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 *

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.

classes Method classes(classNames){String} Since: ArcGIS Maps SDK for JavaScript 4.7 Widget since 4.2, classes added at 4.7.

A utility method used for building the value for a widget's class property. This aids in simplifying css class setup.

Returns

Type Description String The computed class name.

Example

// .tsx syntax showing how to set css classes while rendering the widget

render() {
  const dynamicClasses = {
    [css.flip]: this.flip,
    [css.primary]: this.primary
  };

  return (
    <div class={classes(css.root, css.mixin, dynamicClasses)} />
  );
}

: Destroys the widget instance.

emit Method emit(type, event){Boolean} Since: ArcGIS Maps SDK for JavaScript 4.5 Widget since 4.2, 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.

optional

The event payload.

Returns

Type Description Boolean true if a listener was notified

hasEventListener 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.

hasHandles 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 *

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");
}

isFulfilled Method isFulfilled(){Boolean} Since: ArcGIS Maps SDK for JavaScript 4.19 Widget since 4.2, isFulfilled added at 4.19.

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).

isRejected Method isRejected(){Boolean} Since: ArcGIS Maps SDK for JavaScript 4.19 Widget since 4.2, isRejected added at 4.19.

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.

isResolved Method isResolved(){Boolean} Since: ArcGIS Maps SDK for JavaScript 4.19 Widget since 4.2, isResolved added at 4.19.

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.

on 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 a remove() 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);
});

postInitialize Method postInitialize(): Executes after widget is ready for rendering.

removeHandles 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 *

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");

render Method render(){Object}

This method is implemented by subclasses for rendering.

Returns

Type Description Object The rendered virtual node.

renderNow Method renderNow(): Renders widget to the DOM immediately.

scheduleRender Method scheduleRender(): Schedules widget rendering. This method is useful for changes affecting the UI.

when Method when(callback, errback){Promise} Since: ArcGIS Maps SDK for JavaScript 4.19 Widget since 4.2, when added at 4.19.

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

optional

The function to call when the promise resolves.

optional

The function to execute when the promise fails.

Returns

Type Description Promise Returns a new Promise for the result of callback.

Example

// Although this example uses the BasemapGallery widget, any class instance that is a promise may use when() in the same way
let bmGallery = new BasemapGallery();
bmGallery.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
});

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