DistanceMeasurement2D

AMD: require(["esri/widgets/DistanceMeasurement2D"], (DistanceMeasurement2D) => { /* code goes here */ });
ESM: import DistanceMeasurement2D from "@arcgis/core/widgets/DistanceMeasurement2D";
Class: esri/widgets/DistanceMeasurement2D
Inheritance: DistanceMeasurement2D Widget Accessor
Since: ArcGIS API for JavaScript 4.10

The DistanceMeasurement2D widget calculates and displays the distance between two or more points in a MapView. The widget will compute distances 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 geodesicDistanceThreshold. Distances equivalent to and beyond the threshold will be computed geodetically. By default the threshold is set to 100km.

measurement-line-2d

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 DirectLineMeasurement3D.

For information about gaining full control of widget styles, see the Styling topic.
See also
Example
// To add the DistanceMeasurement2D widget to the map
let measurementWidget = new DistanceMeasurement2D({
  view: view
});
view.ui.add(measurementWidget, "top-right");

Constructors

new DistanceMeasurement2D(properties)
Parameter
properties Object
optional

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

Example
// To add the DistanceMeasurement2D widget to the map
let measurementWidget = new DistanceMeasurement2D({
  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.
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Name Type Summary Class
String|HTMLElement

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

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Widget
String

The name of the class.

more details
Accessor
String

The widget's default CSS icon class.

more details
DistanceMeasurement2D
String

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

more details
Widget
String

The widget's default label.

more details
DistanceMeasurement2D
SystemOrLengthUnit

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

more details
DistanceMeasurement2D
SystemOrLengthUnit[]

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

more details
DistanceMeasurement2D
MapView

A reference to the MapView.

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DistanceMeasurement2D
DistanceMeasurement2DViewModel

The view model for this widget.

more details
DistanceMeasurement2D
Boolean

Indicates whether the widget is visible.

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Widget

Property Details

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 String

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.

Unit system (imperial, metric) or specific unit used for displaying the distance values. Possible values are listed in unitOptions.

Example
// To create the DistanceMeasurement2D widget that displays distance in yards
let measurementWidget = new DistanceMeasurement2D({
  view: view,
  unit: "yards"
});

// To display the current measurement unit
console.log('Current unit: ', measurementWidget.unit);
unitOptions SystemOrLengthUnit[]

List of available units and unit systems (imperial, metric) for displaying the distance values. By default, the following units are included: metric, imperial, inches, feet, us-feet, yards, miles, nautical-miles, meters, kilometers. Possible unit values can only be a subset of this list.

Example
// To display the available units to the console
let measurementWidget = new DistanceMeasurement2D({
  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
let measurementWidget = new DistanceMeasurement2D({
  view: view
});
view.ui.add(measurementWidget, "top-right");

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 DistanceMeasurement2DViewModel class to access all properties and methods on the widget.

Example
// Use the ViewModel to access and set advanced settings
let measurementWidget = new DistanceMeasurement2D({
  viewModel: {
    view: view,
    unit: "feet"
  }
});
view.ui.add(measurementWidget, "top-right");
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

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

more details
Accessor
String

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

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Widget

Destroys the widget instance.

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Widget
Boolean

Emits an event on the instance.

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Widget
Boolean

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

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Widget
Boolean

Returns true if a named group of handles exist.

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Accessor
Boolean

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

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Widget
Boolean

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

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Widget
Boolean

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

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Widget
Object

Registers an event handler on the instance.

more details
Widget

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

more details
Widget

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

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Widget

Removes a group of handles owned by the object.

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Accessor
Object

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

more details
Widget

Renders widget to the DOM immediately.

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Widget

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

more details
Widget
Promise

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

more details
Widget

Method Details

addHandles(handleOrHandles, groupKey)inherited
Since: ArcGIS API for JavaScript 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 }
);

// Handle gets removed when the object is destroyed.
this.addHandles(handle);
Parameters
handleOrHandles WatchHandle|WatchHandle[]

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.

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)} />
  );
}
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.
hasHandles(groupKey){Boolean}inherited
Since: ArcGIS API for JavaScript 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");
}
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.

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(handleOrHandles)inherited
Since: ArcGIS API for JavaScript 4.24

Adds one or more handles which are to be tied to the lifecycle of the widget. The handles will be removed when the widget is destroyed.

const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true}
);

this.own(handle); // Handle gets removed when the widget is destroyed.
Parameter
handleOrHandles 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.

removeHandles(groupKey)inherited
Since: ArcGIS API for JavaScript 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");
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.
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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