Expand

The Expand widget acts as a clickable button for opening a widget.

If adding a Slider, HistogramRangeSlider, or TimeSlider as content to the Expand widget, the container or parent container of the widget must have a width set in CSS for it to render inside the Expand widget.

If setting the width on the slider's container, then set the slider.container as the content of the expand rather than the slider itself.

expand.content = slider.container

See also

Example

// LayerList
layerList = new LayerList({
  container: document.createElement("div"),
  view: view
});
layerListExpand = new Expand({
  expandIconClass: "esri-icon-layer-list",  // see https://developers.arcgis.com/javascript/latest/guide/esri-icon-font/
  // expandTooltip: "Expand LayerList", // optional, defaults to "Expand" for English locale
  view: view,
  content: layerList
});
view.ui.add(layerListExpand, "top-right");

Constructors

new Expand(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

Type	Summary	Class
Boolean	Automatically collapses the expand widget instance when the view's viewpoint updates. more details	Expand
Boolean\|Function	When true, the Expand widget will close after the Escape key is pressed when the keyboard focus is within its content. more details	Expand
String	Icon font used to style the Expand button. more details	Expand
String	Tooltip to display to indicate Expand widget can be collapsed. more details	Expand
String\|HTMLElement	The ID or node representing the DOM element containing the widget. more details	Widget
Node\|String\|Widget	The content to display within the expanded Expand widget. more details	Expand
String	The name of the class. more details	Accessor
Boolean	Indicates whether the widget is currently expanded or not. more details	Expand
String	Icon font used to style the Expand button. more details	Expand
String	Tooltip to display to indicate Expand widget can be expanded. more details	Expand
String	This value associates two or more Expand widget instances with each other, allowing one instance to auto collapse when another instance in the same group is expanded. more details	Expand
Number	A number to display at the corner of the widget to indicate the number of, for example, open issues or unread notices. more details	Expand
String	The unique ID assigned to the widget when the widget is created. more details	Widget
String	The widget's default label. more details	Expand
String	The mode in which the widget displays. more details	Expand
MapView\|SceneView	A reference to the MapView or SceneView. more details	Expand
ExpandViewModel	The view model for this widget. more details	Expand
Boolean	Indicates whether the widget is visible. more details	Widget

Property Details

autoCollapse Boolean

Automatically collapses the expand widget instance when the view's viewpoint updates.

Default Value:false

closeOnEsc Boolean|Function

When true, the Expand widget will close after the Escape key is pressed when the keyboard focus is within its content. This property can also be set to a function that returns a boolean, allowing for more customization for when to allow the Expand widget to be closed from the esc key.

Default Value:true

Examples

let expand = new Expand({
   view: view,
   content: searchWidget,
   // widget will not be able to be closed from the ESC key
   closeOnEsc: false
});

let expand = new Expand({
   view: view,
   content: searchWidget,
   // widget will close on ESC when the search widget has no active menu
   closeOnEsc: function() {
     return searchWidget.activeMenu === "none"
   }
});

collapseIconClass String Since: ArcGIS Maps SDK for JavaScript 4.4

Icon font used to style the Expand button.

See also

Guide - Esri Icon Font

collapseTooltip String

Tooltip to display to indicate Expand widget can be collapsed.

Default Value:"Collapse" (English locale)

container String|HTMLElement inherited

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 cases 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"
});

content Node|String|Widget

The content to display within the expanded Expand widget.

If setting the width on the slider's container (rather than a parent container), then set the slider.container as the content of the expand rather than the slider itself.

expand.content = slider.container

Examples

// A. specify content with a widget
   let searchWidget = new Search({
     view: view
   });

   let expand = new Expand({
     expandIconClass: "esri-icon-search",
     view: view,
     content: searchWidget
   });
   view.ui.add(expand, "bottom-left");

// B. specify content with a string (of HTML)
   content: "Hi, I can have <input placeholder='HTML'/>!"

// C. specify content with a DOM node
   let node = domConstruct.create("div", {
     innerHTML: "I'm a real node!"
   });

   let expand = new Expand({
     expandIconClass: "esri-icon-right-arrow",
     view: view,
     content: node
   });
   view.ui.add(expand, "top-right");

declaredClass Stringreadonly inherited Since: ArcGIS Maps SDK for JavaScript 4.7

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

expanded Boolean

Indicates whether the widget is currently expanded or not.

Default Value:false

expandIconClass String

Icon font used to style the Expand button. Will automatically use the content's iconClass if it has one.

See also

Guide - Esri Icon Font

expandTooltip String

Tooltip to display to indicate Expand widget can be expanded.

Default Value:"Expand" (English locale)

group String Since: ArcGIS Maps SDK for JavaScript 4.6

This value associates two or more Expand widget instances with each other, allowing one instance to auto collapse when another instance in the same group is expanded. For auto collapsing to take effect, all instances of the group must be included in the view.ui.

For example, if you place multiple Expand instances in the top-left of the view's ui, you can assign them to a group called top-left. If one Expand instance is expanded and the user clicks on a different instance in the top-left group, then the first instance is collapsed, allowing the content of the second instance to be fully visible.

Example

let expand1 = new Expand({
  view: view,
  content: document.getElementById("bg-gallery"),
  expandIconClass: "esri-icon-basemap",
  group: "bottom-right"
});
let expand2 = new Expand({
  view: view,
  content: document.getElementById("legend"),
  expandIconClass: "esri-icon-key",
  group: "bottom-right"
});

view.ui.add([expand1, expand2], "bottom-right");

iconNumber Number

A number to display at the corner of the widget to indicate the number of, for example, open issues or unread notices.

id String inherited

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.

label String

The widget's default label.

mode String Since: ArcGIS Maps SDK for JavaScript 4.7

The mode in which the widget displays. These modes are listed below.

mode	description
auto	This is the default mode. It is responsive to browser size changes and will update based on whether the widget is viewed in a desktop or mobile application.
floating	Use this mode if you wish to always display the widget as floating regardless of browser size.
drawer	Use this mode if you wish to always display the widget in a panel regardless of browser size.

Possible Values:"auto"|"floating"|"drawer"

Default Value:"auto"

view MapView|SceneView

A reference to the MapView or SceneView. Set this to link the widget to a specific view.

viewModel ExpandViewModelautocast

The view model for this widget. This is a class that contains all the logic (properties and methods) that controls this widget's behavior. See the ExpandViewModel class to access all properties and methods on the widget.

visible Boolean inherited

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".

Default Value:true

Example

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

Method Overview

Show inherited methods

Hide inherited methods

Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object. more details	Accessor
String	A utility method used for building the value for a widget's `class` property. more details	Widget
	Collapse the widget. more details	Expand
	Destroys the widget instance. more details	Widget
Boolean	Emits an event on the instance. more details	Widget
	Expand the widget. more details	Expand
Boolean	Indicates whether there is an event listener on the instance that matches the provided event name. more details	Widget
Boolean	Returns true if a named group of handles exist. more details	Accessor
Boolean	`isFulfilled()` may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected). more details	Widget
Boolean	`isRejected()` may be used to verify if creating an instance of the class is rejected. more details	Widget
Boolean	`isResolved()` may be used to verify if creating an instance of the class is resolved. more details	Widget
Object	Registers an event handler on the instance. more details	Widget
	Adds one or more handles which are to be tied to the lifecycle of the widget. more details	Widget
	This method is primarily used by developers when implementing custom widgets. more details	Widget
	Removes a group of handles owned by the object. more details	Accessor
Object	This method is primarily used by developers when implementing custom widgets. more details	Widget
	Renders widget to the DOM immediately. more details	Widget
	This method is primarily used by developers when implementing custom widgets. more details	Widget
	Toggle the widget by expanding it if it's collapsed, or collapsing it if it's expanded. more details	Expand
Promise	`when()` may be leveraged once an instance of the class is created. more details	Widget

Method Details

addHandles(handleOrHandles, groupKey)inherited 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.

classes(classNames){String}inherited Since: ArcGIS Maps SDK for JavaScript 4.7

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

Parameter

classNames String|String []|Object

repeatable

The class names.

Returns

Type	Description
String	The computed class name.

See also

Guide - Widget development (rendering)

Example

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

render() {
  const dynamicIconClasses = {
    [CSS.myIcon]: this.showIcon,
    [CSS.greyIcon]: !this.showIcon
  };

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

collapse()

Collapse the widget.

destroy()inherited

Destroys the widget instance.

emit(type, event){Boolean}inherited Since: ArcGIS Maps SDK for JavaScript 4.5

Emits an event on the instance. This method should only be used when creating subclasses of this class.

Parameters

type String

The name of the event.

event Object

optional

The event payload.

Returns

Type	Description
Boolean	`true` if a listener was notified

expand()

Expand the widget.

hasEventListener(type){Boolean}inherited

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

Parameter

type String

The name of the event.

Returns

Type	Description
Boolean	Returns true if the class supports the input event.

hasHandles(groupKey){Boolean}inherited 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");
}

isFulfilled(){Boolean}inherited Since: ArcGIS Maps SDK for JavaScript 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(){Boolean}inherited Since: ArcGIS Maps SDK for JavaScript 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(){Boolean}inherited Since: ArcGIS Maps SDK for JavaScript 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(type, listener){Object}inherited

Registers an event handler on the instance. Call this method to hook an event with a listener.

Parameters

type String|String []

An event or an array of events to listen for.

listener Function

The function to call when the event fires.

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);
});

own(handleOrHandles)inherited Since: ArcGIS Maps SDK for JavaScript 4.24

Adds one or more handles which are to be tied to the lifecycle of the widget. The handles will be removed when the widget is destroyed.

const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true}
);

this.own(handle); // Handle gets removed when the widget is destroyed.

Parameter

handleOrHandles WatchHandle|WatchHandle []

Handles marked for removal once the widget is destroyed.

postInitialize()inherited

This method is primarily used by developers when implementing custom widgets. Executes after widget is ready for rendering.

removeHandles(groupKey)inherited 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");

render(){Object}inherited

This method is primarily used by developers when implementing custom widgets. It must be implemented by subclasses for rendering.

Returns

Type	Description
Object	The rendered virtual node.

renderNow()inherited

Renders widget to the DOM immediately.

scheduleRender()inherited

This method is primarily used by developers when implementing custom widgets. Schedules widget rendering. This method is useful for changes affecting the UI.

toggle()

Toggle the widget by expanding it if it's collapsed, or collapsing it if it's expanded.

when(callback, errback){Promise}inherited Since: ArcGIS Maps SDK for JavaScript 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

callback Function

optional

The function to call when the promise resolves.

errback Function

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
});

ArcGIS Maps SDK for JavaScriptAPI Reference

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