BasemapGallery

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

The BasemapGallery widget displays a collection images representing basemaps from ArcGIS.com or a user-defined set of map or image services. When a new basemap is selected from the BasemapGallery, the map's basemap layers are removed and replaced with the basemap layers of the associated basemap selected in the gallery. By default, the BasemapGallery widget looks like the following image.

basemap-gallery

Known Limitations

All basemaps added to the gallery need to have the same spatial reference.

For information about gaining full control of widget styles, see the Styling topic.
See also:
Example:
let basemapGallery = new BasemapGallery({
  view: view
});
// Add widget to the top right corner of the view
view.ui.add(basemapGallery, {
  position: "top-right"
});

Constructors

new BasemapGallery(properties)
Parameter:
properties Object
optional

See the properties for a list of all the properties that may be passed into the constructor.

Example:
// typical usage
let basemapGallery = new BasemapGallery({
  view: view
});

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
Basemapmore details

The map's basemap.

more detailsBasemapGallery
String|HTMLElementmore details

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

more detailsWidget
Stringmore details

The name of the class.

more detailsAccessor
Booleanmore details

When true, sets the widget to a disabled state so the user cannot interact with it.

more detailsBasemapGallery
Numbermore details

Indicates the heading level to use for the message "No basemaps available" when no basemaps are available in the BasemapGallery.

more detailsBasemapGallery
Stringmore details

The widget's default CSS icon class.

more detailsBasemapGallery
Stringmore details

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

more detailsWidget
Stringmore details

The widget's default label.

more detailsBasemapGallery
LocalBasemapsSource|PortalBasemapsSourcemore details

The source for basemaps that the widget will display.

more detailsBasemapGallery
MapView|SceneViewmore details

The view from which the widget will operate.

more detailsBasemapGallery
BasemapGalleryViewModelmore details

The view model for this widget.

more detailsBasemapGallery
Booleanmore details

Indicates whether the widget is visible.

more detailsWidget

Property Details

activeBasemap Basemap

The map's basemap.

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"
});
declaredClass Stringreadonly inherited
Since: ArcGIS API for JavaScript 4.7

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

disabled Boolean
Since: ArcGIS API for JavaScript 4.15

When true, sets the widget to a disabled state so the user cannot interact with it.

Default Value:false
headingLevel Number
Since: ArcGIS API for JavaScript 4.20

Indicates the heading level to use for the message "No basemaps available" when no basemaps are available in the BasemapGallery. By default, this message is rendered as level 2 headings (e.g. <h2>No basemaps available</h2>). Depending on the widget's placement in your app, you may need to adjust this heading for proper semantics. This is important for meeting accessibility standards.

Default Value:2
See also:
Example:
// "No basemaps available" will render as an <h3>
basemapGallery.headingLevel = 3;
iconClass String
Since: ArcGIS API for JavaScript 4.7

The widget's default CSS icon class.

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
Since: ArcGIS API for JavaScript 4.7

The widget's default label.

The source for basemaps that the widget will display. This property can be autocast with an array or Collection of Basemaps, or a Portal instance. The default source is a PortalBasemapsSource that points to the default portal instance set in esriConfig.portalUrl.

Examples:
const basemapGallery = new BasemapGallery({
   view: view,
   source: [Basemap.fromId("topo-vector"), Basemap.fromId("hybrid")] // autocasts to LocalBasemapsSource
});
const basemapGallery = new BasemapGallery({
   view: view,
   source: { // autocasts to PortalBasemapsSource
     portal: "https://www.yourportal.arcgis.com"
   }
});
const basemapGallery = new BasemapGallery({
   view: view,
   source: new Portal({url: "https://www.yourportal.arcgis.com"}) // autocasts to PortalBasemapsSource
});

The view from which the widget will operate. This view provides access to the active basemap via the view's map property.

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 BasemapGalleryViewModel 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
Stringmore details

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

more detailsWidget
more details

Destroys the widget instance.

more detailsWidget
Booleanmore details

Emits an event on the instance.

more detailsWidget
Booleanmore details

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

more detailsWidget
Booleanmore details

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

more detailsWidget
Booleanmore details

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

more detailsWidget
Booleanmore details

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

more detailsWidget
Objectmore details

Registers an event handler on the instance.

more detailsWidget
more details

Widget teardown helper.

more detailsWidget
more details

This method is primarily used by developers when implementing custom widgets.

more detailsWidget
Objectmore details

This method is primarily used by developers when implementing custom widgets.

more detailsWidget
more details

Renders widget to the DOM immediately.

more detailsWidget
more details

This method is primarily used by developers when implementing custom widgets.

more detailsWidget
Promisemore details

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

more detailsWidget

Method Details

classes(classNames){String}inherited
Since: ArcGIS API 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)} />
  );
}
destroy()inherited

Destroys the widget instance.

emit(type, event){Boolean}inherited
Since: ArcGIS API 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
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.
isFulfilled(){Boolean}inherited
Since: ArcGIS API 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 API 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 API 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. See the Events summary table for a list of supported events.

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(handles)inherited

Widget teardown helper. Any handles added to it will be automatically removed when the widget is destroyed.

Parameter:

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.

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.

when(callback, errback){Promise}inherited
Since: ArcGIS API 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 that may be used to chain additional functions.
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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