AreaMeasurement2D

require(["esri/widgets/AreaMeasurement2D"], function(AreaMeasurement2D) { /* code goes here */ });

Class: esri/widgets/AreaMeasurement2D

Inheritance: AreaMeasurement2D Widget Accessor

Since: ArcGIS API for JavaScript 4.10

The AreaMeasurement2D widget calculates and displays the area and perimeter of a polygon in a MapView. The widget will compute areas and perimeters geodetically for geographic coordinate systems and web mercator. For projected coordinate systems (non-web mercator), computations will be performed planimetrically for distances up to the threshold distance defined by the geodesicDistanceThreshold. Perimeters equivalent to and beyond the threshold will be computed geodetically. By default the threshold is set to 100km.

Undo / Redo

Gesture	Action
Z	Incrementally undos actions recorded in the stack.
R	Incrementally redos actions recorded in the stack.

This widget is designed to work with 2D MapViews. For measurements with 3D SceneViews, use AreaMeasurement3D.

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

See also:

Example:

// To add the AreaMeasurement2D widget to your map
var measurementWidget = new AreaMeasurement2D({
  view: view
});
view.ui.add(measurementWidget, "top-right");

Constructors

new AreaMeasurement2D(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
var measurementWidget = new AreaMeasurement2D({
  view: view
});
view.ui.add(measurementWidget, "top-right");

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 widget's default CSS icon class. more details	more details	AreaMeasurement2D
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	AreaMeasurement2D
String	Unit system (imperial, metric) or specific unit used for displaying the area values. more details	more details	AreaMeasurement2D
String []	List of available units and unit systems (imperial, metric) for displaying the area values. more details	more details	AreaMeasurement2D
MapView	A reference to the MapView. more details	more details	AreaMeasurement2D
AreaMeasurement2DViewModel	The view model for this widget. more details	more details	AreaMeasurement2D

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.

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.

unit String

Unit system (imperial, metric) or specific unit used for displaying the area values.

Example:

// To create the AreaMeasurement2D widget that displays area in square US feet
var measurementWidget = new AreaMeasurement2D({
  view: view,
  unit: "square-us-feet"
});

// To display the current measurement unit
console.log("Current unit: ", measurementWidget.unit);

unitOptions String []

List of available units and unit systems (imperial, metric) for displaying the area values.

Example:

// To display the available units to the console
var measurementWidget = new AreaMeasurement2D({
  view: view
});
console.log("All units: ", measurementWidget.unitOptions.join(", "));

view MapView

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

Example:

// Typical usage
var measurementWidget = new DistanceMeasurement2D({
  view: view
});
view.ui.add(measurementWidget, "top-right");

viewModel AreaMeasurement2DViewModelautocast

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 AreaMeasurement2DViewModel class to access all properties and methods on the widget.

Example:

// Use the ViewModel to access and set advanced settings
var measurementWidget = new AreaMeasurement2D({
  viewModel: {
    view: view,
    unit: "square-us-feet"
  }
});
view.ui.add(measurementWidget, "top-right");

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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JavaScript API 4.14 API Reference

JavaScript API API Reference

AreaMeasurement2D

AreaMeasurement2D

Undo / Redo

Constructors

Property Overview

Property Details

Method Overview

Method Details

JavaScript API 4.14 API Reference

JavaScript API API Reference

Undo / Redo

Constructors

Property Overview

Property Details

Method Overview

Method Details

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