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HomeViewModel | API Reference | ArcGIS Maps SDK for JavaScript 4.33

ESM: import HomeVM from "@arcgis/core/widgets/Home/HomeViewModel.js";

CDN: const HomeVM = await $arcgis.import("@arcgis/core/widgets/Home/HomeViewModel.js");

Class: @arcgis/core/widgets/Home/HomeViewModel

Since: ArcGIS Maps SDK for JavaScript 4.0

Provides the logic for the Home component and Home widget that animates the View to its initial Viewpoint or a previously defined viewpoint.

See also

• Home component

• Home widget - Deprecated since 4.32. Use the Home component instead.

• Programming patterns: Widget viewModel pattern

Example

let homeWidget = new Home({
  viewModel: {  // autocasts as new HomeViewModel()
    view: view
  }
}, "homediv");  // References the DOM node used to place the widget

HomeViewModel Constructor new HomeViewModel(properties)

Parameter

optional

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

Show inherited properties Hide inherited properties

declaredClass

Inherited

Property declaredClass Stringreadonly

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.

Since: ArcGIS Maps SDK for JavaScript 4.8 HomeViewModel since 4.0, goToOverride added at 4.8.

This function provides the ability to override either the MapView goTo() or SceneView goTo() methods.

Example

// The following snippet uses Search but can be applied to any
// widgets that support the goToOverride property.
search.goToOverride = function(view, goToParams) {
  goToParams.options = {
    duration: updatedDuration
  };
  return view.goTo(goToParams.target, goToParams.options);
};

state Property state Stringreadonly

The current state of the widget.

Possible Values:"disabled" |"ready" |"going-home"

The view associated with the widget instance.

The Viewpoint, or point of view, to zoom to when going home. The initial value is determined a few different ways:

• If no View is provided, the value is null.
• If the View is ready, but the Viewpoint is not defined, the initial value of the Viewpoint is determined when the View became ready.
• If the View is ready and the Viewpoint is defined by the user, the initial viewpoint value is the user-defined Viewpoint.

Example

// Creates a viewpoint centered on the extent of a polygon geometry
let vp = new Viewpoint({
  targetGeometry: geom.extent
});

// Sets the model's viewpoint to the Viewpoint based on a polygon geometry
home.ViewModel.viewpoint = vp;

Show inherited methods Hide inherited methods

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

This function provides the ability to interrupt and cancel the process of navigating the view back to the view's initial extent.

Emits an event on the instance.

Animates the view to the initial Viewpoint of the view or the value of viewpoint.

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

Returns true if a named group of handles exist.

Registers an event handler on the instance.

Removes a group of handles owned by the object.

addHandles

Inherited

Method addHandles(handleOrHandles, groupKey)

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

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.

cancelGo Method cancelGo()

Since: ArcGIS Maps SDK for JavaScript 4.9 HomeViewModel since 4.0, cancelGo added at 4.9.

This function provides the ability to interrupt and cancel the process of navigating the view back to the view's initial extent.

emit Method emit(type, event){Boolean}

Since: ArcGIS Maps SDK for JavaScript 4.5 HomeViewModel since 4.0, emit added at 4.5.

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

Parameters

The name of the event.

optional

The event payload.

Returns

Type Description Boolean true if a listener was notified

hasEventListener Method hasEventListener(type){Boolean}

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

Returns

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

hasHandles

Inherited

Method hasHandles(groupKey){Boolean}

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");
}

on Method on(type, listener){Object}

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

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);
});

removeHandles

Inherited

Method removeHandles(groupKey)

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");

Fires when the go() method is called.

Fires when the go() method is called.

Example

homeWidget.viewModel.on("go", function(event){
  console.log("updating viewpoint");
});

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