FeatureTemplatesViewModel

AMD: require(["esri/widgets/FeatureTemplates/FeatureTemplatesViewModel"], (FeatureTemplatesVM) => { /* code goes here */ });
ESM: import FeatureTemplatesVM from "@arcgis/core/widgets/FeatureTemplates/FeatureTemplatesViewModel";
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.
Show inherited properties Hide inherited properties
Name Type Summary Class
String

The name of the class.

more details
Accessor
FilterFunction

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

more details
FeatureTemplatesViewModel
String|GroupByFunction

It is possible to group template items.

more details
FeatureTemplatesViewModel
TemplateItem[]|TemplateItemGroup[]

The template items or grouped template items.

more details
FeatureTemplatesViewModel
FeatureLayer[]

An array of Featurelayers that are associated with the widget.

more details
FeatureTemplatesViewModel
String

The widget's state.

more details
FeatureTemplatesViewModel

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

Example
// Filter and display templates only if their names contain the word `Street`
function myFilterFunction(filter) {
  let containsName = filter.label.includes("Street");
  return containsName;
}

// Create the FeatureTemplates widget
const templates = new FeatureTemplates({
  container: "templatesDiv",
  visibleElements = {
    filter: false // does not display the default feature templates filter
  },
  layers: [featureLayer], // in this example, one layer is used
  filterFunction: myFilterFunction
});

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

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
Boolean

Emits an event on the instance.

more details
FeatureTemplatesViewModel
Boolean

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

more details
FeatureTemplatesViewModel
Boolean

Returns true if a named group of handles exist.

more details
Accessor
Object

Registers an event handler on the instance.

more details
FeatureTemplatesViewModel

This method updates the template items with the provided filter.

more details
FeatureTemplatesViewModel

Removes a group of handles owned by the object.

more details
Accessor

Selects the template item to use.

more details
FeatureTemplatesViewModel

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.

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.
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");
}
on(type, listener){Object}

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);
});
refresh()

This method updates the template items with the provided filter.

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");
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.

more details
FeatureTemplatesViewModel

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.")
        }
      });
    }
  });
});

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