DrawAction | API Reference | ArcGIS Maps SDK for JavaScript 4.31

DrawAction is the base class for all draw actions. DrawActions use the view events to generate a set of coordinates to create new geometries. Each serves a different purpose, allowing you to create a different type geometry such as point, multipoint, polyline, and polygon.

When the draw.create("type of geometry") method is called, an instance of the relevant draw action is returned. You can then listen to its events to create a new geometry that meets criteria specified by the application.

See also

Sample - Prevent drawing a self-intersecting line

Constructors

DrawAction Constructor new DrawAction(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 Watch for changes topic.

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Type	Summary	Class
String	The name of the class.	Accessor
Boolean	Controls whether the created geometry will have z coordinates or not.	DrawAction
Number [][]	Two-dimensional array of numbers representing the coordinates of each vertex comprising the geometry being drawn.	DrawAction
MapView\|SceneView	A reference to the MapView.	DrawAction

Property Details

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

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

hasZ Property hasZ Boolean

Controls whether the created geometry will have z coordinates or not.

Default Value:true

vertices Property vertices Number[][]readonly

Two-dimensional array of numbers representing the coordinates of each vertex comprising the geometry being drawn.

view Property view MapView |SceneView

A reference to the MapView.

Method Overview

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Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
Boolean	Indicates if the redo() method can be called on the action instance.	DrawAction
Boolean	Indicates if the undo() method can be called on the action instance.	DrawAction
Boolean	Emits an event on the instance.	DrawAction
FromScreenPointResult\|null	Maps the given screen point to a map point.	DrawAction
Number []\|null	Maps the given screen point to a map point.	DrawAction
Boolean	Indicates whether there is an event listener on the instance that matches the provided event name.	DrawAction
Boolean	Returns true if a named group of handles exist.	Accessor
Object	Registers an event handler on the instance.	DrawAction
	Incrementally redo actions recorded in the stack.	DrawAction
	Removes a group of handles owned by the object.	Accessor
Point\|null	Maps the given screen point to a map point.	DrawAction
	Incrementally undo actions recorded in the stack.	DrawAction

Method Details

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor 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

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.

canRedo Method canRedo(){Boolean}

Indicates if the redo() method can be called on the action instance.

Returns

Type	Description
Boolean	Returns `true` if the redo() method can be called.

canUndo Method canUndo(){Boolean}

Indicates if the undo() method can be called on the action instance.

Returns

Type	Description
Boolean	Returns `true` if the undo() method can be called.

emit Method emit(type, event){Boolean}

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

getCoordsAndPointFromScreenPoint Method getCoordsAndPointFromScreenPoint(screenPoint){FromScreenPointResult |null}

Maps the given screen point to a map point.

Parameter

screenPoint ScreenPoint

The location on the screen.

Returns

Type	Description
FromScreenPointResult \| null	The result object containing, or `null` if the screen point could not be mapped.

getCoordsFromScreenPoint Method getCoordsFromScreenPoint(screenPoint){Number[] |null}

Maps the given screen point to a map point.

Parameter

screenPoint ScreenPoint

The location on the screen.

Returns

Type	Description
Number [] \| null	Array of x,y and z component (if hasZ is enabled) of the point associated with the given screen point or `null` if screen point could not be mapped.

hasEventListener Method hasEventListener(type){Boolean}

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 Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor 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.

Parameters

type String|String []

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);
});

redo Method redo()

Incrementally redo actions recorded in the stack. Call canRedo() prior to calling this method to check if this method can be called on the action instance. Calling this method will fire the vertex-add or vertex-remove events depending on the last action.

Example

if (action.canRedo()) {
  action.redo();
}

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor 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");

screenToMap Method screenToMap(screenPoint){Point |null}

Maps the given screen point to a map point.

Parameter

screenPoint ScreenPoint

The location on the screen.

Returns

Type	Description
Point \| null	MapPoint associated with the given screen point or null if screen point could not be mapped.

undo Method undo()

Incrementally undo actions recorded in the stack. Call canUndo() prior to calling this method to check if this method can be called on the action instance. Calling this method will fire the vertex-add or vertex-remove events depending on the last action.

Example

if (action.canUndo()) {
  action.undo();
}

Type Definitions

FromScreenPointResult Type Definition FromScreenPointResult

The result object of the getCoordsAndPointFromScreenPoint() method. See the table below for more details on each property.

Properties: vertex Number []

Array of x, y, and z component (if hasZ is enabled).

mapPoint Point

The map point of the point associated with the given screen point.

ScreenPoint Type Definition ScreenPoint

An object representing a point on the screen.

Properties: x Number

The x coordinate.

y Number

The y coordinate.