UniqueValueGroup

AMD: require(["esri/renderers/support/UniqueValueGroup"], (UniqueValueGroup) => { /* code goes here */ });
ESM: import UniqueValueGroup from "@arcgis/core/renderers/support/UniqueValueGroup";
Class: esri/renderers/support/UniqueValueGroup
Inheritance: UniqueValueGroup Accessor
Since: ArcGIS API for JavaScript 4.25

UniqueValueGroup represents a group of unique value classes (i.e. categories). This is used to group a subset of categories under a heading.

At least one group must also be used if you want to represent multiple unique values with a single symbol.

See also
Example
// This example groups categories under three headings:
// Commercial, Residential, and Other
layer.renderer = {
  type: "unique-value",
  field: "zonecode",
  uniqueValueGroups: [{
    heading: "Commercial",
    classes: [{
      label: "C-2 | Community Commercial",
      symbol: createSymbol([255,179,219]),
      values: ["C-1", "C-2"]
    }, {
      label: "C-3 | Major Commercial",
      symbol: createSymbol([255,0,0]),
      values: "C-3"
    }]
  }, {
    heading: "Residential",
    classes: [{
      label: "R-1 | Low-Density Residential",
      symbol: createSymbol([255,255,224]),
      values: "R-1"
    }, {
      label: "R-3 | Limited High-Density Residential",
      symbol: createSymbol([255,214,0]),
      values: "R-3"
    }, {
      label: "R-4 | High-Density Residential",
      symbol: createSymbol([255,166,0]),
      values: "R-4",
    }]
  }, {
    heading: "Other",
    classes: [{
      label: "S | Special Area",
      symbol: createSymbol([161,237,237]),
      values: ["S-DW", "S-DR", "S-RP", "S-JW", "S-RN", "S-WS"]
    }]
  }]
};

Constructors

new UniqueValueGroup(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
UniqueValueClass[]

Specifies the classes (or unique categories) to group under a heading.

more details
UniqueValueGroup
String

The name of the class.

more details
Accessor
String

The heading to be displayed for the group of unique classes in the Legend.

more details
UniqueValueGroup

Property Details

Specifies the classes (or unique categories) to group under a heading. Classes may be included without a heading when representing multiple values with a single symbol.

Example
commercialGroup.classes = [{
  label: "C-2 | Community Commercial",
  symbol: {
    type: "simple-fill",
    color: [255,179,219]
  },
  values: ["C-1", "C-2"]
}, {
  label: "C-3 | Major Commercial",
  symbol: {
    type: "simple-fill",
    color: 255,0,0
  },
  values: "C-3"
}];
declaredClass Stringreadonly inherited

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

heading String

The heading to be displayed for the group of unique classes in the Legend.

Example
commercialGroup.heading = "Commercial";

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
*

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

more details
UniqueValueGroup
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
UniqueValueGroup

Method Details

addHandles(handleOrHandles, groupKey)inherited

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.

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

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

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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