UniqueValueRenderer

layer.renderer = {
  type: "unique-value",  // autocasts as new UniqueValueRenderer()
  field: "REGION",
  defaultSymbol: { type: "simple-fill" },  // autocasts as new SimpleFillSymbol()
  uniqueValueInfos: [{
    // All features with value of "North" will be blue
    value: "North",
    symbol: {
      type: "simple-fill",  // autocasts as new SimpleFillSymbol()
      color: "blue"
    }
  }, {
    // All features with value of "East" will be green
    value: "East",
    symbol: {
      type: "simple-fill",  // autocasts as new SimpleFillSymbol()
      color: "green"
    }
  }, {
    // All features with value of "South" will be red
    value: "South",
    symbol: {
      type: "simple-fill",  // autocasts as new SimpleFillSymbol()
      color: "red"
    }
  }, {
    // All features with value of "West" will be yellow
    value: "West",
    symbol: {
      type: "simple-fill",  // autocasts as new SimpleFillSymbol()
      color: "yellow"
    }
  }],
  visualVariables: [{
    type: "opacity",
    field: "POPULATION",
    normalizationField: "SQ_KM",
    // features with 30 ppl/sq km or below are assigned the first opacity value
    stops: [{ value: 100, opacity: 0.15 },
            { value: 1000, opacity: 0.90 }]
  }]
};

Property Overview

Property Details

authoringInfo AuthoringInfoautocast inherited

Authoring metadata only included in renderers generated from one of the Smart Mapping creator methods, such as sizeRendererCreator.createContinuousRenderer() or colorRendererCreator.createContinuousRenderer(). This includes information from UI elements such as sliders and selected classification methods and themes. This allows the authoring clients to save specific overridable settings so that next time it is accessed via the UI, their selections can be remembered.

backgroundFillSymbol FillSymbol|PolygonSymbol3Dautocast

Since: ArcGIS Maps SDK for JavaScript 4.7

This property is only relevant When symbolizing polygon features with marker symbols (or IconSymbol3DLayer) in the uniqueValueInfos of this renderer. This is usually done when adding a SizeVariable to the visualVariables) in a bivariate visualization (color indicates a type-based value and size indicates the value of a separate numeric field). Use this property to set a background FillSymbol (or PolygonSymbol3D if visualizing data in 3D) to visualize the boundaries of each polygon.

Example

// this symbol will be applied to all features. It is only
// necessary when visualizing polygon data with icons.
renderer.backgroundFillSymbol = {
  type: "simple-fill",
  outline: {
    width: 1,
    color: "gray"
  }
};

declaredClass Stringreadonly inherited

Since: ArcGIS Maps SDK for JavaScript 4.7

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

defaultLabel String

The label used in the Legend to describe features assigned the default symbol. The default symbol is used to draw all features with values not referenced by uniqueValueInfos or uniqueValueGroups.

defaultSymbol Symbolautocast

The symbol used to draw all features with values not referenced by uniqueValueInfos or uniqueValueGroups. If null, unmatched features will not be assigned a symbol.

Known Limitations

SceneLayers with a mesh geometryType will display unmatching features with a generic symbol even if the defaultSymbol is null.

field String

The name of the attribute field containing types or categorical values referenced in uniqueValueInfos or uniqueValueGroups.

Example

let renderer = {
  type: "unique-value",  // autocasts as new UniqueValueRenderer()
  field: "RANK",  // contains values referenced in uniqueValueInfos
  uniqueValueInfos: [
    {
      value: "high",  // features labeled as "high"
      symbol: sym1  // will be assigned sym1
    }, {
      value: "medium",  // features labeled as "medium"
      symbol: sym2  // will be assigned sym2
    }, {
      value: "low",  // features labeled as "low"
      symbol: sym3  // will be assigned sym2
    }
  ]
};

field2 String

Specifies the name of an additional attribute field used to categorize features. All combinations of field and field2 values are unique categories and may have their own symbol.

When defining a set of uniqueValueInfos, a fieldDelimiter must be specified.

See also

• fieldDelimiter

Examples

// categorizes combinations of values in field and field2 with uniqueValueInfos
let renderer = {
  type: "unique-value",  // autocasts as new UniqueValueRenderer()
  field: "REGION",
  field2: "RANK",
  fieldDelimiter: ", ",  // comma + space used to separate values from all fields
  uniqueValueInfos: [
    {
      value: "North, 1",  // features in the "North" region and a rank of 1
      symbol: sym1  // will be assigned sym1
    }, {
      value: "North, 2",  // features in the "North" region and a rank of 2
      symbol: sym2  // will be assigned sym2
    }, {
      value: "South, 1",  // features in the "South" region and a rank of 1
      symbol: sym3  // will be assigned sym3
    }, {
      value: "South, 2",  // features in the "South" region and a rank of 2
      symbol: sym4  // will be assigned sym4
    }
  ]
};

// categorizes combinations of values in field and field2 with uniqueValueGroups
let renderer = {
  type: "unique-value",  // autocasts as new UniqueValueRenderer()
  field: "Obesity_prevalence",  // values are either "high" or "low"
  field2: "Diabetes_prevalence",  // values are either "high" or "low"
  uniqueValueGroups: [{
    classes: [{
      symbol: {
        // an object of common symbol properties
        ...commonProperties,
        color: "yellow"
      },
      label: "Low obesity; Low diabetes",
      values: {
        value: "low",
        value2: "low"
      }
    }, {
      symbol: {
        ...commonProperties,
        color: "orange"
      },
      label: "Low obesity; High diabetes",
      values: {
        value: "low",
        value2: "high"
      }
    }, {
      symbol: {
        ...commonProperties,
        color: "red"
      },
      label: "High obesity; Low diabetes",
      values: {
        value: "high",
        value2: "low"
      }
    }, {
      symbol: {
        ...commonProperties,
        color: "purple"
      },
      label: "High obesity; High diabetes",
      values: {
        value: "high",
        value2: "high"
      }
    }]
  }]
};

field3 String

Specifies the name of a third attribute field used to categorize features. All combinations of field, field2, and field3 values are unique categories and may have their own symbol.

When defining a set of uniqueValueInfos, a fieldDelimiter must be specified.

See also

• fieldDelimiter

Examples

// categorizes combinations of values in field, field2, and field3 with uniqueValueInfos
let renderer = {
  type: "unique-value",  // autocasts as new UniqueValueRenderer()
  field: "REGION",
  field2: "RANK",
  field3: "CLASS",
  fieldDelimiter: " | ",  // pipe symbol padded with spaces used to separate values from all fields
  uniqueValueInfos: [
    {
      value: "North | 1 | medium",  // features in the "North" region, a rank of 1, and "medium" class
      symbol: sym1  // will be assigned sym1
    }, {
      value: "North | 2 | medium",  // features in the "North" region, a rank of 2, and a "medium class
      symbol: sym2  // will be assigned sym2
    },
    ...
  ]
};

// categorizes combinations of values in field, field2, and field3 with uniqueValueGroups
let renderer = {
  type: "unique-value",  // autocasts as new UniqueValueRenderer()
  field: "Obesity_prevalence",  // values are either "high" or "low"
  field2: "Diabetes_prevalence",  // values are either "high" or "low"
  field3: "Alcohol_nat_avg" // values are either "above" or "below" national average
  uniqueValueGroups: [{
    classes: [{
      symbol: {
        // an object of common symbol properties
        ...commonProperties,
        color: "yellow"
      },
      label: "Low obesity; Low diabetes; Low alcohol",
      values: {
        value: "low",
        value2: "low",
        value3: "low"
      }
    }, {
      symbol: {
        ...commonProperties,
        color: "orange"
      },
      label: "Low obesity; High diabetes; High alcohol",
      values: {
        value: "low",
        value2: "high",
        value3: "high"
      }
    }]
  }]
};

fieldDelimiter String

A string used as a separator between the values in the legend if multiple attribute fields are used to categorize values. This property only applies when uniqueValueInfos are used to categorize values. It does not apply for uniqueValueGroups.

By default, a comma is used as the field delimiter if field and field2 are defined (since version 4.25).

See also

• field2

• field3

Example

let renderer = {
  type: "unique-value",  // autocasts as new UniqueValueRenderer()
  field: "REGION",
  field2: "RANK",
  fieldDelimiter: ", ",  // comma + space used to separate values from all fields
  uniqueValueInfos: [
    {
      value: "North, 1",  // features in the "North" region and a rank of 1
      symbol: sym1  // will be assigned sym1
    }, {
      value: "North, 2",  // features in the "North" region and a rank of 2
      symbol: sym2  // will be assigned sym2
    },
    ...
  ]
};

legendOptions Object

An object providing options for displaying the renderer in the Legend.

Property

title String optional Describes the variable driving the visualization. This is displayed as the title of the categories in the Legend and takes precedence over a field alias or valueExpressionTitle.

Example

renderer.legendOptions = {
  title: "Classification"
};

orderByClassesEnabled Boolean

Since: ArcGIS Maps SDK for JavaScript 4.26

Indicates whether the order of the classes or uniqueValueInfos in the renderer definition should be used for the feature drawing order of the layer. If orderBy is set on the layer, then the drawing order specified in that property will take precedence over this property.

Known Limitations

This property only controls feature drawing order in MapView. Configuring feature drawing order in SceneView is not supported.

Default Value:false

Example

renderer.orderByClassesEnabled = true;

type Stringreadonly

The type of Renderer.

For UniqueValueRenderer the type is always "unique-value".

uniqueValueGroups UniqueValueGroup[]autocast

Since: ArcGIS Maps SDK for JavaScript 4.25

An array of objects defining groups of unique values. This is required if you want to group sets of unique values under subheadings. Unique value groups also allow you to combine or merge multiple unique values to a single class so they are represented by one symbol and one label.

This property should be used in favor of uniqueValueInfos.

Example

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"]
    }]
  }]
};

uniqueValueInfos UniqueValueInfo[]

Defines categories and their corresponding symbols based on a set of values expected from the provided field or valueExpression.

Example

layer.renderer = {
  type: "unique-value",
  field: "zonecode",
  uniqueValueInfos: [{
    label: "C-2 | Community Commercial",
    symbol: createSymbol([255,179,219]),
    value: "C-2"
  }, {
    label: "C-3 | Major Commercial",
    symbol: createSymbol([255,0,0]),
    value: "C-3"
  }, {
    label: "R-1 | Low-Density Residential",
    symbol: createSymbol([255,255,224]),
    value: "R-1"
  }, {
    label: "R-3 | Limited High-Density Residential",
    symbol: createSymbol([255,214,0]),
    value: "R-3"
  }, {
    label: "R-4 | High-Density Residential",
    symbol: createSymbol([255,166,0]),
    value: "R-4"
  }]
};

valueExpression String

An Arcade expression following the specification defined by the Arcade Visualization Profile. Expressions in UniqueValueRenderer may reference field values using the $feature profile variable and must return a string or a number.

The values returned from this expression should match categories defined in uniqueValueInfos or uniqueValueGroups.

This property is typically used as an alternative to field for data-driven visualizations.

See also

• Arcade Visualization Profile

Example

let renderer = {
  type: "unique-value",  // autocasts as new UniqueValueRenderer()
  valueExpression: "When($feature.count < 20, 'low', $feature.count >= 20 && $feature.count < 70, 'moderate', $feature.count >=70, 'high', 'other')",
  uniqueValueInfos: [ ... ],  // assigns symbols to features evaluating to 'low', 'moderate', or 'high'
};

valueExpressionTitle String

The title identifying and describing the associated Arcade expression as defined in the valueExpression property. This is displayed as the title of the categories or groups in the Legend in the absence of a provided title in the legendOptions property.

Example

renderer.valueExpression = "IIF($feature.POP > 500000, 'high', 'low')";
renderer.valueExpressionTitle = "Classification";

visualVariables VisualVariable[]autocast

Autocasts from Object[]

An array of VisualVariable objects. Each object must indicate the type of visual variable to apply (e.g. ColorVisualVariable, SizeVisualVariable, OpacityVisualVariable, RotationVisualVariable), the numeric field or expression from which to drive the visualization, and the visual values to map to the data. The following list identifies each visual variable type and provides a link to the specification table of each.

Type	Object Specification	Legend Example
color	ColorVariable
size	SizeVisualVariable
opacity	OpacityVisualVariable
rotation	RotationVisualVariable	-

Visual variables are primarily be used in two ways.

1. Thematic mapping

In most cases, visual variables are used to create visualizations based on a thematic attribute (e.g. population, education, rank, money, magnitude, etc.) in either 2D or 3D.

renderer.visualVariables = [{
  type: "size",
  field: "POP_POVERTY",
  normalizationField: "TOTPOP_CY",
  legendOptions: {
    title: "% population in poverty by county"
  },
  stops: [
    { value: 0.15, size: 4, label: "<15%" },
    { value: 0.25, size: 12, label: "25%" },
    { value: 0.35, size: 24, label: ">35%" }
  ]
}];

You can take the visualization a step further and use multiple visual variables in the same renderer. The sample below uses three visual variables (size, color, and opacity).

2. Mapping real-world sizes

The size visual variable can be used to visualize the true sizes of features (e.g. tree canopy, road width, building height, etc.) based on their size in the real world. This can be particularly powerful when working in a 3D SceneView. The image below shows a layer of trees that uses visual variables to size each feature to the true dimensions of each tree based on data stored in multiple attribute fields.

See the Thematic visualization with realistic 3D symbols for an example of using multiple visual variables to visualize your data.

Known Limitations

Color and opacity visual variables must not have more than 8 stops and size visual variables must not have more than 6 stops. This does not apply to variables driven by view scale.

For apps where users can interactively change the field or valueExpression of a visual variable, we suggest you include all potential fields referenced by visual variables in the outFields of the layer. This ensures the best user experience when switching or updating fields in renderers.

See also

• Styles and data visualization

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.

addUniqueValueInfo(valueOrInfo, symbol)

Adds a unique value and symbol to the renderer. You can provide the value and its associated symbol as individual arguments or as an info object.

Parameters

valueOrInfo String|Number|Object The value to match. The value can be provided as an individual argument or as an info object described in uniqueValueInfos.

symbol Symbol autocast optional Autocasts from Object The symbol used to represent features matching the specified value.

Examples

let renderer = {
  type: "unique-value",  // autocasts as new UniqueValueRenderer()
  field: "REGION",
  defaultSymbol: { type: "simple-fill" }   // autocasts as new SimpleFillSymbol()
};
// Add a unique value info for the "North" region
// using individual function arguments
renderer.addUniqueValueInfo({
  value: "North",
  symbol: {
    type: "simple-fill",  // autocasts as new SimpleFillSymbol()
    color: "blue"
  }
});

// Add a unique value info for the "West" region
// using a unique info object
renderer.addUniqueValueInfo({
  value: "West",
  symbol: new SimpleFillSymbol({
    color: "yellow"
  }),
  label: "West region"  // will display this text in legend
});

clone(){UniqueValueRenderer}

Creates a deep clone of the renderer.

Returns

Type	Description
UniqueValueRenderer	A deep clone of the object that invoked this method.

Example

// Creates a deep clone of the first layer's renderer
let renderer = view.map.layers.at(0).renderer.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.

getUniqueValueInfo(graphic){Promise<UniqueValueInfo>}

Returns rendering and legend information (as defined by the renderer) associated with the given graphic.

Parameter

graphic Graphic The graphic whose rendering and legend information will be returned.

Returns

Type	Description
Promise<UniqueValueInfo>	Resolves to an object describing the UniqueValueInfo object to which the input graphic belongs as defined by the renderer.

Example

view.on("click", function(event){
  view.hitTest(event)
    .then(function(hitResponse){
      const resultGraphic = hitResponse.results[0].graphic;
      // assumes the layer's renderer is a UniqueValueRenderer instance
      return layer.renderer.getUniqueValueInfo(resultGraphic);
    }).then(function(uniqueValueInfo){
      // returns the unique value info to which the graphic belongs.
    });
});

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");

removeUniqueValueInfo(value)

Removes a unique value from the renderer.

Parameter

value String|Number Value to remove from uniqueValueInfos.

Example

// removes the unique value info object for
// features in the West region. They will now
// be displayed with the default symbol and label
renderer.removeUniqueValueInfo("West");

toJSON(){Object}inherited

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.