ClassBreaksRenderer | API Reference | ArcGIS Maps SDK for JavaScript 4.31

ClassBreaksRenderer defines the symbol of each feature in a Layer based on the value of a numeric attribute. Symbols are assigned based on classes or ranges of data. Each feature is assigned a symbol based on the class break in which the value of the attribute falls.

Supported layers

ClassBreaksRenderer may only be used to create visualizations for the following layer types: FeatureLayer, SceneLayer, MapImageLayer, CSVLayer, GeoJSONLayer, OGCFeatureLayer, WFSLayer, StreamLayer, ImageryLayer, and ImageryTileLayer

A numeric attribute field from which to define the class breaks must be specified. Each break and its associated symbol must also be defined using the addClassBreakInfo() method or the classBreakInfos property in the constructor.

In the example below a FeatureLayer representing block groups is rendered with a ClassBreaksRenderer. Features where fewer than 35% of the population have a college degree are rendered with a deep green color. Features where between 35% and 50% of the population have a college degree are rendered with a pale green symbol. The other features are similarly rendered based on the value of the attribute of interest.

See also

Example

let renderer = new ClassBreaksRenderer({
  // attribute of interest - Earthquake magnitude
  field: "MAGNITUDE"
});
// All features with magnitude between 0 - 4.0
renderer.addClassBreakInfo({
  minValue: 0,
  maxValue: 4.0,
  symbol: {
    type: "point-3d",  // autocasts as new PointSymbol3D()
    symbolLayers: [{
      type: "object",  // autocasts as new ObjectSymbol3DLayer()
      resource: { primitive: "cone" },
      material: { color: [0, 169, 230] },
      height: 200000,
      width: 50000
    }]
  }
});
// All features with magnitude between 4.1 - 7.0
renderer.addClassBreakInfo({
  minValue: 4.1,
  maxValue: 7.0,
  symbol: {
    type: "point-3d",  // autocasts as new PointSymbol3D()
    symbolLayers: [{
      type: "object",  // autocasts as new ObjectSymbol3DLayer()
      resource: { primitive: "cone" },
      material: { color: [230, 230, 0] },
      height: 800000,
      width: 90000
    }]
  }
});
// All features with magnitude between 7.1 - 10.0
renderer.addClassBreakInfo({
  minValue: 7.1,
  maxValue: 10.0,
  symbol: {
    type: "point-3d",  // autocasts as new PointSymbol3D()
    symbolLayers: [{
      type: "object",  // autocasts as new ObjectSymbol3DLayer()
      resource: { primitive: "cone" },
      material: { color: [230, 0, 0] },
      height: 3200000,
      width: 130000
    }]
  }
});

let layer = new FeatureLayer({
  url: "http://url.to.service",
  renderer: renderer
});

Constructors

ClassBreaksRenderer Constructor new ClassBreaksRenderer(properties)

Parameter

properties Object

optional

See the properties for a list of all the properties that may be passed into the constructor.

Example

// Typical usage
let renderer = {
  type: "class-breaks",  // autocasts as new ClassBreaksRenderer()
  field: "fieldName",
  classBreakInfos: [ ... ]
};

Property Overview

Any properties can be set, retrieved or listened to. See the Watch for changes topic.

Show inherited properties

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Type	Summary	Class
AuthoringInfo	Authoring metadata only included in renderers generated from one of the Smart Mapping creator methods, such as sizeRendererCreator.createContinuousRenderer() or colorRendererCreator.createContinuousRenderer().	Renderer
FillSymbol\|PolygonSymbol3D\|CIMSymbol	When symbolizing polygon features with graduated symbols, set a FillSymbol on this property to visualize the boundaries of each feature.	ClassBreaksRenderer
ClassBreakInfo []	Each element in the array is an object that provides information about a class break associated with the renderer.	ClassBreaksRenderer
String	The name of the class.	Accessor
String	Label used in the Legend to describe features assigned the default symbol.	ClassBreaksRenderer
Symbol	The default symbol assigned to features with a value not matched to a given break.	ClassBreaksRenderer
String	The name of a numeric attribute field whose data determines the symbol of each feature based on the class breaks defined in classBreakInfos.	ClassBreaksRenderer
Object	An object providing options for displaying the renderer in the Legend.	ClassBreaksRenderer
String	When normalizationType is `field`, this property contains the attribute field name used for normalization.	ClassBreaksRenderer
Number	When normalizationType is `percent-of-total`, this property contains the total of all data values.	ClassBreaksRenderer
String	Indicates how the data is normalized.	ClassBreaksRenderer
String	The type of renderer.	ClassBreaksRenderer
String	An Arcade expression following the specification defined by the Arcade Visualization Profile.	ClassBreaksRenderer
String	The title identifying and describing the associated Arcade expression as defined in the valueExpression property.	ClassBreaksRenderer
VisualVariable []	An array of VisualVariable objects.	ClassBreaksRenderer

Property Details

authoringInfo Inherited Property authoringInfo AuthoringInfoautocast Inherited from Renderer

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 Property backgroundFillSymbol FillSymbol |PolygonSymbol3D |CIMSymbolautocast

When symbolizing polygon features with graduated symbols, set a FillSymbol on this property to visualize the boundaries of each feature. Use a FillSymbol of varying sizes in the classBreakInfos to indicate the quantity.

Support for CIMSymbol was added at version 4.31 and is limited to 2D MapView.

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"
  }
};

classBreakInfos Property classBreakInfos ClassBreakInfo[]

Each element in the array is an object that provides information about a class break associated with the renderer.

Example

let renderer = {
  type: "class-breaks",  // autocasts as new ClassBreaksRenderer()
  field: "HARVESTED_ACRES",
  classBreakInfos: [
    {
      minValue: 0,  // 0 acres
      maxValue: 200000,  // 200,000 acres
      symbol: sym1,  // will be assigned sym1
      label: "fewer than 200,000 acres"
    }, {
      minValue: 200001,  // 200,001 acres
      maxValue: 500000,  // 500,000 acres
      symbol: sym2,  // will be assigned sym2
      label: "200,000 - 500,000 acres"
    }, {
      minValue: 500001,  // 500,001 acres
      maxValue: 750000,  // 750,000 acres
      symbol: sym3,  // will be assigned sym2
      label: "more than 500,000 acres"
    }
  ]
};

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.7 Accessor since 4.0, declaredClass added at 4.7.

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

defaultLabel Property defaultLabel String

Label used in the Legend to describe features assigned the default symbol. The default symbol is used to draw all features with unspecified, unmatched values.

defaultSymbol Property defaultSymbol Symbolautocast

The default symbol assigned to features with a value not matched to a given break. 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 Property field String

The name of a numeric attribute field whose data determines the symbol of each feature based on the class breaks defined in classBreakInfos.

Example

let renderer = {
  type: "class-breaks",  // autocasts as new ClassBreaksRenderer()
  field: "totalAcres",  // values returned by this field will
                        // be used to render features
  classBreakInfos: [
    {
      minValue: 0,  // 0 acres
      maxValue: 200000,  // 200,000 acres
      symbol: sym1  // will be assigned sym1
    }, {
      minValue: 200001,  // 200,001 acres
      maxValue: 500000,  // 500,000 acres
      symbol: sym2  // will be assigned sym2
    }, {
      minValue: 500001,  // 500,001 acres
      maxValue: 750000,  // 750,000 acres
      symbol: sym3  // will be assigned sym2
    }
  ]
};

legendOptions Property legendOptions Objectautocast

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

Property: title String|null|undefined

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

Example

renderer.legendOptions = {
  title: "Population density"
};

normalizationField Property normalizationField String

When normalizationType is field, this property contains the attribute field name used for normalization.

normalizationTotal Property normalizationTotal Number

When normalizationType is percent-of-total, this property contains the total of all data values.

normalizationType Property normalizationType String

Indicates how the data is normalized. If this property is defined, then the class breaks contain a normalized min/max value instead of the value in the given field. The data value obtained from the field is normalized in one of the following ways before it is compared with the class breaks. See the table below for a list of possible values.

Possible Value	Description
field	Divides the data value using the attribute value of the field specified in the normalizationField property. This value is set by default if the normalizationField is provided.
log	Computes the base 10 logarithm of the data value. This can be a useful approach for some data distributions because it reduces the influence of very large data values.
percent-of-total	Divides the data value by the sum of all data values then multiplies by 100. Use normalizationTotal to define the total value by which to normalize. This value is set by default if the normalizationTotal is provided.

With the exception of log normalization, data normalization creates a ratio by dividing two values. When comparing attribute values between features, normalization minimizes the effect of varying map areas and the number of observations.

For example, dividing the 18 to 30 year old population by the area of a polygon feature yields a density value that can be compared evenly with other features, regardless of their size.

Possible Values:"field" |"log" |"percent-of-total"

type Property type Stringreadonly

The type of renderer.

For ClassBreaksRenderer the type is always "class-breaks".

valueExpression Property valueExpression String

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

The values returned from this expression are the data used to drive the visualization as defined in the classBreakInfos.

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

See also

Arcade Visualization Profile

Example

// expression calculating voter turnout based on two field values
let renderer = {
  type: "class-breaks",  // autocasts as new ClassBreaksRenderer()
  valueExpression: "( $feature.TOT_VOTES / $feature.REG_VOTERS ) * 100",
  classBreakInfos: [ ... ],  // assigns symbols to manual class breaks
  // e.g. 0-20, 20-40, 40-60, 60-80, 80-100
};

valueExpressionTitle Property 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 corresponding renderer in the Legend in the absence of a provided title in the legendOptions property.

Example

renderer.valueExpression = "$feature.POP / $feature.SQ_MI * 100";
renderer.valueExpressionTitle = "Population per square mile";

visualVariables Property 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

Show inherited methods

Hide inherited methods

Return Type	Summary	Class
	Adds a class break to the renderer.	ClassBreaksRenderer
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
ClassBreaksRenderer	Creates a deep clone of the renderer.	ClassBreaksRenderer
*	Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product.	Renderer
Promise<ClassBreakInfo>	Returns the classBreakInfo information (as defined by the renderer) associated with the given graphic.	ClassBreaksRenderer
Boolean	Returns true if a named group of handles exist.	Accessor
	Removes a break from the renderer.	ClassBreaksRenderer
	Removes a group of handles owned by the object.	Accessor
Object	Converts an instance of this class to its ArcGIS portal JSON representation.	Renderer

Method Details

addClassBreakInfo Method addClassBreakInfo(min, max, symbol)

Adds a class break to the renderer. You can provide the minimum, maximum and symbol values as individual arguments or by using the info object. The range of the break is greater than or equal to the minimum value and less than the maximum value.

Parameters

min Number|Object

The minimum value to use in the break. This can be a number or an info object as defined in classBreakInfos.

max Number

optional

The maximum value to use in the break.

symbol Symbol

optional

Symbol to use for the break.

Examples

// add a class break using an info object
renderer.addClassBreakInfo({
  minValue: 0,  // lower limit of the break
  maxValue: 2,  // upper limit of the break
  symbol: symbol1  // the symbol assigned to features in this break
});

// add a class break using arguments
renderer.addClassBreakInfo(2, 4, symbol2);
// Features with values between 2 - 4 will be assigned symbol2
});

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, addHandles added at 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.

clone Method clone(){ClassBreaksRenderer}

Creates a deep clone of the renderer.

Returns

Type	Description
ClassBreaksRenderer	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 Inherited Method 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.

getClassBreakInfo Method getClassBreakInfo(graphic){Promise<ClassBreakInfo>}

Returns the classBreakInfo information (as defined by the renderer) associated with the given graphic.

Parameter

graphic Graphic

The graphic whose rendering information will be returned.

Returns

Type	Description
Promise<ClassBreakInfo>	Resolves to an object containing rendering and legend information for the break associated with the graphic.

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 ClassBreakRenderer instance
      return layer.renderer.getClassBreakInfo(resultGraphic);
    }).then(function(classBreak){
      // returns the class break info to which the graphic belongs.
    });
});

hasHandles Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 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");
}

removeClassBreakInfo Method removeClassBreakInfo(min, max)

Removes a break from the renderer.

Parameters

min Number

Minimum value in the break to remove

max Number

Maximum value in the break to remove.

Example

// removes the break defined for values between 2 - 4.
renderer.removeClassBreakInfo(2,4);

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 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 Inherited Method toJSON(){Object} Inherited from Renderer

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.