SnappingOptions

The SnappingOptions allows users to configure snapping for their editing or drawing experience in both the Sketch and Editor widgets.

Snapping options provide the ability to specify whether an application will utilize self snapping, feature snapping, or both. Both are described below.

It is also possible to toggle snapping by pressing and holding down the CTRL key. This toggles the snapping on/off.

Self snapping (Geometry guides)

Self snapping is set via the selfEnabled property. This means that while a user is actively creating or updating a feature or graphic, they will see visualizations to help identify perpendicular and parallel lines, in addition to visualizations which aid in snapping to an extension of an existing feature. The following briefly demonstrates what self snapping looks like in a 2D application. Although this is shown for 2D, the same premise applies for 3D as well.

Feature snapping

Feature snapping is set via the featureEnabled property. It provides the ability to snap vertices of a graphic or feature that is currently being drawn or reshaped to that of an existing feature's vertex, edge, or end point. These existing features belong to layers within the Map and must be specified in the featureSources property. The following two images demonstrate feature snapping in a 2D application. Similar to self snapping, the same premise applies for 3D as well.

The above shows feature snapping to an existing feature's vertex endpoint and edge while creating a new feature. The bottom demonstrates taking an existing feature and reshaping its geometry to snap to another feature's vertex points.

Things to consider:

• Layer types currently supported for snapping are: FeatureLayer, GraphicsLayer, GeoJSONLayer, WFSLayer, CSVLayer, MapNotesLayer (2D only), 3D Object SceneLayer (3D only), and BuildingSceneLayer (3D only).
• Snapping is not yet implemented when using the Sketch widget's circle tool. It will be addressed in a future release.
• Enabling snapping via the CTRL key is not currently supported using the Sketch widget's rectangle and circle tools. However, snapping can still be activated by setting the snappingOptions.enabled property to true in the Sketch widget or its view model. Note that this enables snapping for all tools. This behavior is subject to change in a future release.

Name	Details	3D Example	2D Example
Rectangle	Snap lines that are perpendicular to each other
Parallel	Snap to all parallel lines
Extension	Snap to an extension of the current shape
Vertex (as seen when updating geometries)	Snap vertices to an existing vertex

See also

• FeatureSnappingLayerSource
• Sketch
• SketchViewModel
• Editor

• Sample - Sketch widget

• Sample - Sketch in 3D

• Sample - Edit features in 3D with the Editor widget

• Sample - Editor widget with configurations

• Sample - Snapping with Sketch widget and Magnifier

Example

// Create a new instance of Sketch, and set
// a layer for one of the featureSources property.
// This enables feature snapping on that layer.
const sketch = new Sketch({
  layer: graphicsLayer,
  view: view,
  snappingOptions: { // autocasts to SnappingOptions()
    enabled: true, // global snapping is turned on
    // assigns a collection of FeatureSnappingLayerSource() and enables feature snapping on this layer
    featureSources: [{ layer: graphicsLayer, enabled: true }]
  }
});

Constructors

new SnappingOptions(properties)

Parameter

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

Property Overview

Property Details

declaredClass Stringreadonly inherited

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

distance Number

Snapping distance for snapping in pixels.

Default Value:5

enabled Boolean

Global configuration to turn snapping on or off. Note that snapping is turned off by default.

Default Value:false

featureEnabled Boolean

Global configuration option to turn feature snapping on or off.

Default Value:true

featureSources Collection<FeatureSnappingLayerSource>

List of sources for feature snapping. Please refer to FeatureSnappingLayerSource for additional information on what layer sources are supported.

selfEnabled Boolean

Global configuration option to turn self snapping (within one feature while either drawing or reshaping) on or off.

Default Value:true

Method Overview

Method Details

addHandles(handleOrHandles, groupKey)inherited

Since: ArcGIS Maps SDK 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 }
);

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.

hasHandles(groupKey){Boolean}inherited

Since: ArcGIS Maps SDK 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");
}

removeHandles(groupKey)inherited

Since: ArcGIS Maps SDK 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");