Measurement

AMD: require(["esri/widgets/Measurement"], (Measurement) => { /* code goes here */ });
ESM: import Measurement from "@arcgis/core/widgets/Measurement";
Class: esri/widgets/Measurement
Inheritance: Measurement Widget Accessor
Since: ArcGIS API for JavaScript 4.13

The Measurement widget groups and manages multiple measurement tools and allows you to easily switch between them using the activeTool property. The tools correspond to the measurement widgets for area and distance in 2D (AreaMeasurement2D, DistanceMeasurement2D) and in 3D (AreaMeasurement3D, DirectLineMeasurement3D).

This widget follows a composite pattern that allows developers to configure the UI to best match their specific requirements. The measurement tools, placements, and icons can all be configured, which offers great flexibility to use with tabbed interfaces or other customized UI. See the Measurement widget sample for an example of this flexibility.

measurement-widget

For 2D MapViews, distances are computed geodetically for geographic coordinate systems and web mercator. For non-web mercator projected coordinate systems, computations will be performed planimetrically for distances up to the threshold distance defined by the geodesicDistanceThreshold property of the widget's ViewModel. Distances equivalent to and beyond the threshold will be computed geodetically. By default the threshold is set to 100km.

For 3D SceneViews, the mode in which distances are computed is either euclidean or geodesic. In euclidean mode, the distances are measured as straight lines in the ECEF coordinate system. In geodesic mode, the distances are measured as geodesic lines on the WGS84 ellipsoid.

For information about gaining full control of widget styles, see the Styling topic.
See also:
Example:
// Add the measurement widget to the upper right hand corner
// with the distance tool active
const map = new Map({
  basemap: "hybrid"
});

const view = new MapView({
  container: "viewDiv",
  map: map,
  center: [-71.69, 43.76],
  zoom: 15
});

const measurement = new Measurement({
  view: view,
  activeTool: "distance"
});
view.ui.add(measurement, "top-right");

// Switch between area and distance measurement
function switchTool() {
 const tool = measurement.activeTool === "distance" ? "area" : "distance";
 measurement.activeTool = tool;
}

Constructors

new Measurement(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
Stringmore details

Specifies the current measurement tool to display.

more detailsMeasurement
AreaMeasurement2D|AreaMeasurement3D|DirectLineMeasurement3D|DistanceMeasurement2Dmore details

The measurement widget that is currently being used.

more detailsMeasurement
SystemOrAreaUnitmore details

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

more detailsMeasurement
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
Stringmore details

The widget's default CSS icon class.

more detailsMeasurement
Stringmore details

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

more detailsWidget
Stringmore details

The widget's default label.

more detailsMeasurement
SystemOrLengthUnitmore details

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

more detailsMeasurement
MapView|SceneViewmore details

A reference to the MapView or SceneView.

more detailsMeasurement
MeasurementViewModelmore details

The view model for this widget.

more detailsMeasurement
Booleanmore details

Indicates whether the widget is visible.

more detailsWidget

Property Details

activeTool String

Specifies the current measurement tool to display. Setting its value to area activates the area measurement tool and it works for both MapView and SceneView. To measure distance in a MapView set the property to distance and in a SceneView set it to direct-line. If this property is not set, the widget will not be displayed.

Possible Values:"area"|"distance"|"direct-line"

Default Value:null
Example:
// To create the Measurement widget with SceneView's direct-line tool active.
const measurement = new Measurement({
  view: view,
  activeTool: "direct-line"
});

// To switch between direct line and area measurement tools
function switchTool() {
 const tool = measurement.activeTool === "direct-line" ? "area" : "direct-line";
 measurement.activeTool = tool;
}

The measurement widget that is currently being used. Use this property to get access to the active widget.

Default Value:null
Example:
// Print the active widget to the console.
const measurement = new Measurement({
  view: view,
  activeTool: "distance"
});
view.ui.add(measurement, "top-right");
console.log("Active Widget: ", measurement.activeWidget);
areaUnit SystemOrAreaUnit

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

Example:
// To create the Measurement widget that displays area in square US feet
const measurement = new Measurement({
  view: view,
  activeTool: "area",
  unit: "square-us-feet"
});

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

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.

iconClass Stringreadonly

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

The widget's default label. This property is useful whenever the widget is controlled by another one (e.g. Expand).

linearUnit SystemOrLengthUnit

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

Example:
// To create the Measurement widget that displays distance in yards
const measurement = new Measurement({
  view: view,
  activeTool: "distance",
  linearUnit: "yards"
});

// To display the current measurement unit
console.log('Current linear unit: ', measurement.linearUnit);

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

Example:
// To create the Measurement widget for SceneView with the direct-line tool active.
const measurement = new Measurement({
  view: sceneView,
  activeTool: "direct-line"
});

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

Example:
// Intialize a measurement widget using the view model.
const measurement = new Measurement({
  viewModel: {
    view: view,
    activeTool: "distance",
    unit: "yards"
  }
});
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

Removes all measurement widgets and associated graphics.

more detailsMeasurement
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
more details

Starts a new measurement for the active measurement widget.

more detailsMeasurement
Promisemore details

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

more detailsWidget

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 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)} />
  );
}
clear()

Removes all measurement widgets and associated graphics.

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.
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.

startMeasurement()

Starts a new measurement for the active measurement widget.

Example:
const measurement = new Measurement({
  view: view,
  activeTool: "distance"
});

function measure () {
  measurement.startMeasurement();
}

measure();
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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