Expand

AMD: require(["esri/widgets/Expand"], (Expand) => { /* code goes here */ });
ESM: import Expand from "@arcgis/core/widgets/Expand.js";
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
const layerList = new LayerList({
  container: document.createElement("div"),
  view: view
});
const layerListExpand = new Expand({
  expandIcon: "layers",  // see https://developers.arcgis.com/calcite-design-system/icons/
  // expandTooltip: "Expand LayerList", // optional, defaults to "Expand" for English locale
  view: view,
  content: layerList
});
view.ui.add(layerListExpand, "top-right");

Constructors

Expand

Constructor
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

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

Expand

When true, the Expand widget will close after the Escape key is pressed when the keyboard focus is within its content.

Expand

Calcite icon used to style the Expand button when the content can be collapsed.

Expand

Tooltip to display to indicate Expand widget can be collapsed.

Expand

The ID or node representing the DOM element containing the widget.

Widget

The content to display within the expanded Expand widget.

Expand

The name of the class.

Accessor

Calcite icon used when the widget is collapsed.

Expand

Tooltip to display to indicate Expand widget can be expanded.

Expand

Indicates whether the widget is currently expanded or not.

Expand

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.

Expand

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

Expand

The unique ID assigned to the widget when the widget is created.

Widget

The widget's default label.

Expand

The mode in which the widget displays.

Expand

The placement used by the calcite popover when the widget is expanded.

Expand

A reference to the MapView or SceneView.

Expand

The view model for this widget.

Expand

Indicates whether the widget is visible.

Widget

Property Details

autoCollapse

Property
autoCollapse Boolean

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

Default Value:false

closeOnEsc

Property
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"
   }
});

collapseIcon

Property
collapseIcon String
Since: ArcGIS Maps SDK for JavaScript 4.27 Expand since 4.3, collapseIcon added at 4.27.

Calcite icon used to style the Expand button when the content can be collapsed.

Default Value:"chevrons-right"
See also

collapseTooltip

Property
collapseTooltip String

Tooltip to display to indicate Expand widget can be collapsed.

Default Value:"Collapse" (English locale)

container

Inherited
Property
container String |HTMLElement
Inherited from Widget

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"
});

content

Property
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({
     expandIcon: "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({
     expandIcon: "arrow-right",
     view: view,
     content: node
   });
   view.ui.add(expand, "top-right");

declaredClass

Inherited
Property
declaredClass Stringreadonly
Inherited from Accessor
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.

expandIcon

Property
expandIcon String
Since: ArcGIS Maps SDK for JavaScript 4.27 Expand since 4.3, expandIcon added at 4.27.

Calcite icon used when the widget is collapsed. Will automatically use the content's icon if it has one.

Default Value:"chevrons-left"
See also

expandTooltip

Property
expandTooltip String

Tooltip to display to indicate Expand widget can be expanded.

Default Value:"Expand" (English locale)

expanded

Property
expanded Boolean

Indicates whether the widget is currently expanded or not.

Default Value:false

group

Property
group String
Since: ArcGIS Maps SDK for JavaScript 4.6 Expand since 4.3, group added at 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"),
  expandIcon: "basemap",
  group: "bottom-right"
});
let expand2 = new Expand({
  view: view,
  content: document.getElementById("legend"),
  expandIcon: "key",
  group: "bottom-right"
});

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

iconNumber

Property
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

id

Inherited
Property
id String
Inherited from 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.

label

Property
label String

The widget's default label.

mode

Property
mode String
Since: ArcGIS Maps SDK for JavaScript 4.7 Expand since 4.3, mode added at 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"

placement

Property
placement null |String
Since: ArcGIS Maps SDK for JavaScript 4.30 Expand since 4.3, placement added at 4.30.

The placement used by the calcite popover when the widget is expanded.

Possible Values:"auto" |"auto-start" |"auto-end" |"top" |"top-start" |"top-end" |"bottom" |"bottom-start" |"bottom-end" |"right" |"right-start" |"right-end" |"left" |"left-start" |"left-end" |"leading-start" |"leading" |"leading-end" |"trailing-end" |"trailing" |"trailing-start"

Default Value:null

view

Property
view MapView |SceneView

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

viewModel

Property
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

Inherited
Property
visible Boolean
Inherited from Widget

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.

Accessor

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

Widget

Collapse the widget.

Expand

Destroys the widget instance.

Widget

Emits an event on the instance.

Widget

Expand the widget.

Expand

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

Widget

Returns true if a named group of handles exist.

Accessor

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

Widget

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

Widget

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

Widget

Registers an event handler on the instance.

Widget

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

Widget

Executes after widget is ready for rendering.

Widget

Removes a group of handles owned by the object.

Accessor

This method is implemented by subclasses for rendering.

Widget

Renders widget to the DOM immediately.

Widget

Schedules widget rendering.

Widget

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

Expand
Promise

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

Widget

Method Details

addHandles

Inherited
Method
addHandles(handleOrHandles, groupKey)
Inherited from Accessor
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
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

Inherited
Method
classes(classNames){String}
Inherited from Widget
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.

Parameter
classNames String|String[]|Object
repeatable

The class names.

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)} />
  );
}

collapse

Method
collapse()

Collapse the widget.

destroy

Inherited
Method
destroy()
Inherited from Widget

Destroys the widget instance.

emit

Inherited
Method
emit(type, event){Boolean}
Inherited from Widget
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
type String

The name of the event.

event Object
optional

The event payload.

Returns
Type Description
Boolean true if a listener was notified

expand

Method
expand()

Expand the widget.

hasEventListener

Inherited
Method
hasEventListener(type){Boolean}
Inherited from Widget

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

Inherited
Method
hasHandles(groupKey){Boolean}
Inherited from Accessor
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

Inherited
Method
isFulfilled(){Boolean}
Inherited from Widget
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

Inherited
Method
isRejected(){Boolean}
Inherited from Widget
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

Inherited
Method
isResolved(){Boolean}
Inherited from Widget
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

Inherited
Method
on(type, listener){Object}
Inherited from Widget

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

Inherited
Method
own(handleOrHandles)
Inherited from Widget
Since: ArcGIS Maps SDK for JavaScript 4.24 Widget since 4.2, own added at 4.24.
Deprecated since 4.28 Use addHandles() instead.

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
Method
postInitialize()
Inherited from Widget

Executes after widget is ready for rendering.

removeHandles

Inherited
Method
removeHandles(groupKey)
Inherited from Accessor
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

Inherited
Method
render(){Object}
Inherited from Widget

This method is implemented by subclasses for rendering.

Returns
Type Description
Object The rendered virtual node.

renderNow

Inherited
Method
renderNow()
Inherited from Widget

Renders widget to the DOM immediately.

scheduleRender

Inherited
Method
scheduleRender()
Inherited from Widget

Schedules widget rendering. This method is useful for changes affecting the UI.

toggle

Method
toggle()

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

when

Inherited
Method
when(callback, errback){Promise}
Inherited from Widget
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
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
});

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