FeatureTemplatesViewModel

require(["esri/widgets/FeatureTemplates/FeatureTemplatesViewModel"], function(FeatureTemplatesVM) { /* code goes here */ });
Class: esri/widgets/FeatureTemplates/FeatureTemplatesViewModel
Inheritance: FeatureTemplatesViewModel Accessor
Since: ArcGIS API for JavaScript 4.10

Provides the logic for the FeatureTemplates widget.

See also:
Example:
const templatesVM = new FeatureTemplatesViewModel({
  layers: layers
});

const featureTemplates = new FeatureTemplates({
  viewModel: templatesVM
  container: "templatesDiv"
});

Constructors

new FeatureTemplatesViewModel(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.
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Name Type Summary Class
String

The name of the class.

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FilterFunction

Function can be defined to help filter template items within the widget.

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String|GroupByFunction

It is possible to group template items.

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TemplateItem[]|TemplateItemGroup[]

The template items or grouped template items.

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FeatureLayer[]

An array of Featurelayers that are associated with the widget.

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String

The widget's state.

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Property Details

declaredClass Stringreadonly inherited

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

filterFunction FilterFunction

Function can be defined to help filter template items within the widget. A custom function can be used to aid when searching for templates. It takes a function which passes in an object containing a name property of the template item.

featureTemplatesFilterFunction

It is possible to group template items. This can aid in managing various template items and how they display within the widget. The values are discussed below.

Type Description Example
layer This is the default grouping. Groups template items by layers. featureTemplatesGroupByLayer
geometry Groups template items by geometry type. FeatureTemplatesGroupByGeometry
none The widget displays everything in one list with no grouping. featureTemplatesGroupByLayer
GroupByFunction Custom function that takes an object containing a FeatureTemplate and FeatureLayer. FeatureTemplatesGroupByCustomGroupFunction
Default Value:layer
Example:
// This example shows using a function to check if
// the layer title contains the word 'military'. If so,
// return a group of items called "All Military Templates"
function customGroup(grouping) {
  // Consolidate all military layers
  if (grouping.layer.title.toLowerCase().indexOf("military") > -1) {
    return "All Military Templates"
  }
// Otherwise, group by layer title
  return grouping.layer.title;
}

// Create the FeatureTemplates widget
templates = new FeatureTemplates({
  container: "templatesDiv",
  layers: layers,
  groupBy: customGroup
});

The template items or grouped template items.

An array of Featurelayers that are associated with the widget. The order in which these layers are set in the array dictates how they display within the widget.

The widget is designed to only display layers that are enabled for editing. It will not display layers that are enabled to only edit attributes.

Example:
// The layers to display within the widget
let militaryUnits = new FeatureLayer({
  url: "http://sampleserver6.arcgisonline.com/arcgis/rest/services/Military/FeatureServer/2"
});

let militaryHostile = new FeatureLayer({
  url: "http://sampleserver6.arcgisonline.com/arcgis/rest/services/Military/FeatureServer/6"
});

let layers = [militaryUnits, militaryHostile];

// Create FeatureTemplates widget
templates = new FeatureTemplates({
  container: "templatesDiv",
  layers: layers
});
state Stringreadonly

The widget's state. Possible values are in the table below.

Value Description
ready Dependencies are met and has valid property values.
loading Layers are still loading and not ready yet.
disabled No layers are available to load.

Possible Values:"ready"|"loading"|"disabled"

Default Value:disabled

Method Overview

Name Return Type Summary Class
Boolean

Emits an event on the instance.

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Boolean

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

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Object

Registers an event handler on the instance.

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This method updates the template items with the provided filter.

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Selects the template item to use.

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Method Details

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
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.
on(type, listener){Object}

Registers an event handler on the instance. Call this method to hook an event with a listener.

Parameters:

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);
});
refresh()

This method updates the template items with the provided filter.

select(item)

Selects the template item to use.

Parameter:
optional

The template item to select.

See also:

Event Overview

Name Type Summary Class
{item: TemplateItem,template: FeatureTemplate}

Fires when a template item is selected.

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Event Details

select

Fires when a template item is selected. This occurs when the select method is called.

Properties:

The selected template item.

template FeatureTemplate

The feature template associated with the template item.

See also:
Example:
// Listen for when a template item is selected
templatesVM.on("select", function(evtTemplate) {
  // Access the selected template item's attributes
  attributes = evtTemplate.template.prototype.attributes;

  // Create a new feature with the selected template at cursor location
  const handler = view.on("click", function(event) {
    handler.remove(); // remove click event handler.
    event.stopPropagation(); // stop click event propagation

    if (event.mapPoint) {
      // Create a new feature with the selected template item.
      editFeature = new Graphic({
        geometry: event.mapPoint,
          attributes: {
            "IncidentType": attributes.IncidentType
          }
      });

      // Setup the applyEdits parameter with adds.
      const edits = {
        addFeatures: [editFeature]
      };
      featureLayer.applyEdits(params).then(function(editsResult) {
        if (editsResult.addFeatureResults.length > 0) {
          console.log("Created a new feature.")
        }
      });
    }
  });
});