Swipe

require(["esri/widgets/Swipe"], function(Swipe) { /* code goes here */ });

Class: esri/widgets/Swipe

Inheritance: Swipe Widget Accessor

Since: ArcGIS API for JavaScript 4.13

The Swipe widget provides a tool to show a portion of a layer or layers on top of a map. Layers can be swiped vertically or horizontally to easily compare two layers or see what is underneath a layer.

To use the Swipe widget, set the leadingLayers and trailingLayers properties to determine what will be compared on either side of the widget. If one of these properties is not set, then the Swipe widget will overlay the existing map. The visibleElements separate the leading and trailing layers, as shown in the image below.

Known Limitations

This widget is not currently supported with a SceneView.
There is no current support for GroupLayer in the leadingLayers or trailingLayers.

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

See also:

Example:

var swipe = new Swipe({
  view: view,
  leadingLayers: [layer1, layer2],
  trailingLayers: [layer3],
  direction: "vertical", // swipe widget will move from top to bottom of view
  position: 50 // position set to middle of the view (50%)
});
view.ui.add(swipe);

Constructors

new Swipe(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
String\|HTMLElement	The ID or node representing the DOM element containing the widget. more details	more details	Widget
String	The name of the class. more details	more details	Accessor
Boolean	When `true`, this property indicates whether the widget has been destroyed. more details	more details	Widget
String	The direction the Swipe widget moves across the view. more details	more details	Swipe
Boolean	When `true`, sets the widget to a disabled state so the user cannot interact with it. more details	more details	Swipe
String	The text that shows in a tooltip when hovering over the handle of the Swipe widget. more details	more details	Swipe
String	The widget's default CSS icon class. more details	more details	Swipe
String	The unique ID assigned to the widget when the widget is created. more details	more details	Widget
String	The widget's default label. more details	more details	Swipe
Collection<Layer>	A collection of Layers that will show on the left or top side of the Swipe widget. more details	more details	Swipe
Number	The position of the Swipe widget. more details	more details	Swipe
Collection<Layer>	A collection of Layers that will show on the right or bottom side of the Swipe widget. more details	more details	Swipe
MapView	A reference to the MapView. more details	more details	Swipe
SwipeViewModel	The view model for this widget. more details	more details	Swipe
Object	The visible elements that are displayed within the widget. more details	more details	Swipe

Property Details

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"
});

declaredClass Stringreadonly inherited

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

destroyed Boolean inherited

When true, this property indicates whether the widget has been destroyed.

direction String

The direction the Swipe widget moves across the view. If "horizontal", the widget will move left and right and if "vertical", the widget will move up and down.

horizontal	vertical

Possible Values:"horizontal"|"vertical"

Default Value:"horizontal"

disabled Boolean

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

Default Value:false

dragLabel String

The text that shows in a tooltip when hovering over the handle of the Swipe widget.

iconClass String

The widget's default CSS icon class.

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.

leadingLayers Collection<Layer>autocast

A collection of Layers that will show on the left or top side of the Swipe widget. See the image in the class description at the top of the page. Currently, all layers are supported except GroupLayers.

See also:

trailingLayers

position Number

The position of the Swipe widget. This determines what percentage of the view will be taken up by the leadingLayers.

Default Value:25

trailingLayers Collection<Layer>autocast

A collection of Layers that will show on the right or bottom side of the Swipe widget. See the image in the class description at the top of the page. Currently, all layers are supported except GroupLayers.

See also:

leadingLayers

view MapView

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

viewModel SwipeViewModelautocast

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 SwipeViewModel class to access all properties and methods on the widget.

visibleElements Object

The visible elements that are displayed within the widget. This property provides the ability change the visibility of individual elements of the widget's display.

Properties:

handle Boolean

Indicates whether the handle from which you drag the widget is visible. Default value is true.

divider Boolean

Indicates whether the divider between the leading and trailing layers is visible. Default value is true.

Example:

swipe.visibleElements = {
   divider: true,
   handle: false // handle will not display
}

Method Overview

Show inherited methods Hide inherited methods

Return Type	Summary	Class
String	A utility method used for building the value for a widget's `class` property. more details	more details	Widget
	Destroys the widget instance. more details	more details	Widget
Boolean	Emits an event on the instance. more details	more details	Widget
Boolean	Indicates whether there is an event listener on the instance that matches the provided event name. more details	more details	Widget
Object	Registers an event handler on the instance. more details	more details	Widget
	Widget teardown helper. more details	more details	Widget
	This method is primarily used by developers when implementing custom widgets. more details	more details	Widget
Object	This method is primarily used by developers when implementing custom widgets. more details	more details	Widget
	Renders widget to the DOM immediately. more details	more details	Widget
	This method is primarily used by developers when implementing custom widgets. more details	more details	Widget

Method Details

classes(classNames){String}inherited

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

Parameter:

classNames Array<(string|Array<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)} />
  );
}

destroy()inherited

Destroys the widget instance.

emit(type, event){Boolean}inherited

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.

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 []

A event type, or an array of event types, to listen for.

listener Function

The function to call when the event is fired.

Returns:

Type Description

Object

Returns an event handler with a remove() method that can 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 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.

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.

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