TopFilter

AMD: require(["esri/rest/support/TopFilter"], (TopFilter) => { /* code goes here */ });
ESM: import TopFilter from "@arcgis/core/rest/support/TopFilter";
Class: esri/rest/support/TopFilter
Inheritance: TopFilter Accessor
Since: ArcGIS API for JavaScript 4.20

This class defines the top filter parameters for executing top features queries for features from a FeatureLayer. This parameter must be set on the TopFeaturesQuery object when calling any of top query methods on a FeatureLayer. It is used to set the groupByFields, orderByFields, and count criteria used the top features query. For example, you can use FeatureLayer's queryTopFeatures() method to query the most populous three counties in each state of the United States.

// query the top three most populous counties from each state.
// Results will be ordered based the population of each county in descending order
// top query will run against all features available in the service
const query = new TopFeaturesQuery({
  outFields: ["State, Pop_total, County"],
  topFilter: new TopFilter({
    topCount: 3,
    groupByFields: ["State"],
    orderByFields: ["Pop_total DESC"]
  })
});
featureLayer.queryTopFeatures(query)
  .then(function(response){
     // returns a feature set with features containing the most populous
     // three counties in each state ordered by the number of population.
     // The following attributes are returned as well: State, Pop_total, County
   });
See also

Constructors

new TopFilter(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
String[]

When one or more field names are provided in this property, the output result will be grouped based on unique values from those fields.

more details
TopFilter
String[]

One or more field names used to order the query results.

more details
TopFilter
Number

Defines the number of features to be returned from the top features query.

more details
TopFilter

Property Details

declaredClass Stringreadonly inherited

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

groupByFields String[]

When one or more field names are provided in this property, the output result will be grouped based on unique values from those fields.

orderByFields String[]

One or more field names used to order the query results. Specify ASC (ascending) or DESC (descending) after the field name to control the order. The default order is ASC.

Example
const query = new TopFeaturesQuery({
  outFields: ["State, Pop_total, County"],
  topFilter: new TopFilter({
    topCount: 3,
    groupByFields: ["State"],
    orderByFields: ["Pop_total DESC"]
  })
});
topCount Number

Defines the number of features to be returned from the top features query.

Example
const query = new TopFeaturesQuery({
  outFields: ["State, Pop_total, County"],
  topFilter: new TopFilter({
    topCount: 3,
    groupByFields: ["State"],
    orderByFields: ["Pop_total DESC"]
  })
});

Method Overview

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Name Return Type Summary Class

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

more details
Accessor
TopFilter

Creates a deep clone of TopFilter object.

more details
TopFilter
*

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product.

more details
TopFilter
Boolean

Returns true if a named group of handles exist.

more details
Accessor

Removes a group of handles owned by the object.

more details
Accessor
Object

Converts an instance of this class to its ArcGIS portal JSON representation.

more details
TopFilter

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.

clone(){TopFilter}

Creates a deep clone of TopFilter object.

Returns
Type Description
TopFilter A new instance of a TopFilter object equal to the object used to call .clone().
fromJSON(json){*}static

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. The object passed into the input json parameter often comes from a response to a query operation in the REST API or a toJSON() method from another ArcGIS product. See the Using fromJSON() topic in the Guide for details and examples of when and how to use this function.

Parameter
json Object

A JSON representation of the instance in the ArcGIS format. See the ArcGIS REST API documentation for examples of the structure of various input JSON objects.

Returns
Type Description
* Returns a new instance of this class.
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");
}
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");
toJSON(){Object}

Converts an instance of this class to its ArcGIS portal JSON representation. See the Using fromJSON() guide topic for more information.

Returns
Type Description
Object The ArcGIS portal JSON representation of an instance of this class.

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