Expand

AMD: require(["esri/widgets/Expand"], (Expand) => { /* code goes here */ });
ESM: import Expand from "@arcgis/core/widgets/Expand";
Class: esri/widgets/Expand
Inheritance: Expand Widget Accessor
Since: ArcGIS Maps SDK for JavaScript 4.3

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

For information about gaining full control of widget styles, see the Styling topic.
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
Name 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
collapseTooltip String

Tooltip to display to indicate Expand widget can be collapsed.

Default Value:"Collapse" (English locale)

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 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 (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
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.

expand widget icon number

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"

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

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
Name 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 }
);

// Handle gets removed when the object is destroyed.
this.addHandles(handle);
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
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

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
});

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.