widget

AMD: require(["esri/widgets/support/widget"], (widget) => { /* code goes here */ });
ESM: import * as widget from "@arcgis/core/widgets/support/widget.js";
Object: esri/widgets/support/widget
Since: ArcGIS Maps SDK for JavaScript 4.2

This module contains widget helpers.

Method Overview

Name Return Type Summary Object

This convenience decorator is used to help simplify accessibility within the widget keyboard events.

widget

Utility method used for creating CSS animation/transition functions.

widget

Utility method used to determine if a pressed key should activate button behavior.

widget

Utility method used to determine if the directionality of the text of the document is right-to-left.

widget

This convenience decorator is used to help simplify localization of the widget.

widget

This convenience method is used to assign an HTMLElement DOM node reference to a variable.

widget

This convenience method is used to render the JSX in the widget.render() method.

widget

This convenience decorator helps dispatch view model events on the widget instance.

widget

Method Details

accessibleHandler

Method
accessibleHandler(){Function}

This convenience decorator is used to help simplify accessibility within the widget keyboard events. For example, it can be used to execute a method when the space or enter keys are pressed.

Returns
Type Description
Function The property descriptor.
Example
// .tsx syntax providing accessibility on a widget method
@accessibleHandler()
reset: () => void;

cssTransition

Method
cssTransition(type, className){Function}
Since: ArcGIS Maps SDK for JavaScript 4.7 widget since 4.2, cssTransition added at 4.7.

Utility method used for creating CSS animation/transition functions.

Parameters
type String

The animation/transition type.

Possible Values:"enter"|"exit"

className String

The animation/transition class name.

Returns
Type Description
Function The animation/transition function.
Example
// .tsx syntax showing how to set up node enter/exit animations

render() {
  const content = this.visible ? (
    <div enterAnimation={cssTransition("enter", CSS.fadeIn)}
         exitAnimation={cssTransition("exit", CSS.fadeOut)}>
      I fade in and out.
    </div>
  ) : null;

  return (
    <div class={CSS.base}>{content}</div>
  );
}

isActivationKey

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

Utility method used to determine if a pressed key should activate button behavior. If the returned KeyboardEvent.key is either Enter or a space (" "), it returns true.

Parameter
Returns
Type Description
Boolean Indicates whether the pressed keyboard key is either Enter or a space (" ").

isRTL

Method
isRTL(){Boolean}
Since: ArcGIS Maps SDK for JavaScript 4.9 widget since 4.2, isRTL added at 4.9.

Utility method used to determine if the directionality of the text of the document is right-to-left.

Returns
Type Description
Boolean true if the directionality of the text of the document is right-to-left.

messageBundle

Method
messageBundle(bundleId){Function}
Since: ArcGIS Maps SDK for JavaScript 4.18 widget since 4.2, messageBundle added at 4.18.

This convenience decorator is used to help simplify localization of the widget. It is useful to decorate a property that will be automatically populated with the localized message bundled specified by the identifier bundleId. The property can then be used in the render() function to display the localized content.

When a widget is instantiated, all of the message bundles are loaded and assigned to their corresponding properties. The widget's postInitialize method is called, followed by the first call to render.

When the locale changes, all of the message bundles for all of the active widgets are reloaded and reassigned. The widgets then render simultaneously.

If functions are working with translated strings outside of a widget, use intl.fetchMessageBundle instead.

Note that the first call to render() only occurs after all the properties decorated with @messageBundle have been populated with their corresponding bundle.

Parameter
bundleId String
optional

The bundle identifier passed to intl.fetchMessageBundle().

Returns
Type Description
Function The property decorator.
Example
// .tsx syntax to define a message bundle property
@property()
@messageBundle("my-application/MyBundle")
messages: { [key: string]: any };

render() {
  return (
    <div>{this.messages.myMessage}</div>
  );
}

storeNode

Method
storeNode(node)
Since: ArcGIS Maps SDK for JavaScript 4.6 widget since 4.2, storeNode added at 4.6.

This convenience method is used to assign an HTMLElement DOM node reference to a variable. It does this by taking a HTMLElement passed from either the afterUpdate or afterCreate callbacks. In order to use this, the element must have a set data-node-ref attribute. In addition, it must also be bound to the widget instance, e.g. bind={this}.

Parameter

The referenced DOM node.

Example
// The storeNode function is called after the node is
// added to the DOM. Bind the node to the widget and
// pass in the node's root element name.

render() {
  return (
    <div afterCreate={storeNode} bind={this} data-node-ref="rootNode" />
  );
}

tsx

Method
tsx(selector, properties, children){Object}
Since: ArcGIS Maps SDK for JavaScript 4.4 widget since 4.2, tsx added at 4.4.

This convenience method is used to render the JSX in the widget.render() method. It is required to import tsx even though it is not explicitly called.

Parameters
selector String

The element to create.

properties Object
optional

The element's properties.

children Object
optional

The element's children.

Returns
Type Description
Object The virtual node.
Example
// .tsx syntax importing jsxfactory
import { tsx } from "esri/widgets/support/widget";

vmEvent

Method
vmEvent(eventNames){Function}

This convenience decorator helps dispatch view model events on the widget instance.

Parameter
eventNames String|String[]

The event names to re-dispatch.

Returns
Type Description
Function The property decorator.
Example
// .tsx syntax dispatching view model events
@property()
@vmEvent("search, search-clear, suggest")
viewModel: SearchViewModel;

Type Definitions

GoToOverride

Type Definition
GoToOverride(view, goToParameters)

The following properties define a goTo override function.

Parameters
Specification

A reference to the MapView or SceneView where the navigation takes place.

goToParameters Object

The overriding target and optional parameters to pass to the IMapView's goTo() or SceneView's goTo() method.

Specification

The target location/viewpoint/extent to animate to.

optional

Options defining the animation, duration, and easing of the navigation.

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