size | API Reference | ArcGIS Maps SDK for JavaScript 4.30

See also

Styles and data visualization

Method Overview

Return Type	Summary	Object
Promise<AgeRendererResult>	Generates a continuous size Renderer representing the age of features based on one or more fields.	size
Promise<ClassBreaksRendererResult>	Generates a ClassBreaksRenderer that may be applied directly to the layer used to call this method.	size
Promise<ContinuousRendererResult>	Generates a Renderer that may be applied directly to the layer used to call this method.	size
Promise<VisualVariableResult>	This method generates an array of size visual variables with default stops that are optimally chosen based on the statistics queried for the indicated field or expression and mapped to appropriate sizes.	size
Promise<(ClassBreaksRenderer\|UniqueValueRenderer)>	Updates a renderer generated from createContinuousRenderer() that uses a specialty reference size variable (i.e.	size

Method Details

createAgeRenderer Method createAgeRenderer(params){Promise<AgeRendererResult>} Since: ArcGIS Maps SDK for JavaScript 4.9 size since 4.2, createAgeRenderer added at 4.9.

Generates a continuous size Renderer representing the age of features based on one or more fields. The age of a feature is calculated based on a given startTime and endTime, one of which must be a date field in the input layer. This method generates an Arcade expression and calculates statistics on the output of the expression to accomplish this. The resulting renderer contains a continuous size visual variable that maps optimal sizes to data values returned from summary statistics.

You are required to provide a layer, view, startTime, and endTime to generate this renderer. Optionally, you can set a unit for the visualization. Other options are provided for convenience for more involved custom visualization authoring applications. For example, if you already generated statistics in another operation, you can pass the statistics object to the statistics parameter to avoid making an extra call to the server.

Parameters

Specification

params Object

Input parameters for generating a continuous size visualization of age for time data returned from start and/or end date field(s). See the table below for details of each parameter.

Specification

The layer for which the visualization is generated.

view View

The view where the input layer is rendered. This method inspects the view's background (i.e. basemap, web map background, or view container) to determine optimal colors for the output renderer.

startTime Date|String|Number

The name of the field, or a date value representing the start time in the age calculation. If a date value is specified, then the endTime parameter must reference a Date field in the layer.

endTime Date|String|Number

The name of the field, or a date value representing the end time in the age calculation. If a date value is specified, then the startTime parameter must reference a Date field in the layer.

unit String

optional

The time unit used to calculate the difference between endTime and startTime. If a unit is not specified, then a suggested unit is determined based on the spread and distribution of the data.

theme String

optional

Default Value: high-to-low

Sets the size stops based on meaningful data values.

Value	Description
high-to-low	The max data value is assigned the max size. The min data value is assigned the min size. All other values are interpolated.
above	The max data value is assigned the max size. The average data value is assigned the min size. All other values between the max data value and the average are interpolated. This is useful for mapping an increase in a variable over time, like an increase in population, or unemployment between two dates.
below	The min data value is assigned the max size. The average data value, is assigned the min size. All other values between the min data value and the average are interpolated. This is useful for mapping a decline in a variable over time, like a decrease in population, or unemployment between two dates.

Possible Values:"high-to-low"|"above"|"below"

maxValue Number

optional

Sets a maximum age for the visualization. Even if data exists above this value, only statistics will be calculated for values between the minValue and maxValue. Added at version 4.15.

minValue Number

optional

Sets a minimum age for the visualization. Even if data exists below this value, only statistics will be calculated for values between the minValue and maxValue. Added at version 4.15.

outlineOptimizationEnabled Boolean

optional

Default Value: false

Only for polygon layers. Indicates whether the polygon outline width should vary based on view scale. When set, a valid MapView instance must be provided in the view parameter. This option is not supported for 3D SceneViews.

sizeOptimizationEnabled Boolean

optional

Default Value: false

Indicates whether symbol sizes should vary based on view scale. When set, a valid MapView instance must be provided in the view parameter. This option is not supported for 3D SceneViews.

legendOptions Object

optional

Provides options for modifying Legend properties describing the visualization.

Specification

title String

optional

The title used to represent the age size ramp in the Legend.

showLegend Boolean

optional

Indicates whether to include the age renderer in the legend.

statistics SummaryStatisticsResult

optional

A statistics object generated from the summaryStatistics function. The createAgeRenderer() method generates an Arcade expression and executes a statistics query against the layer for the result of the expression. If statistics for the expression have already been generated, then pass the object here to avoid making a second statistics query.

sizeScheme SizeScheme

optional

In authoring apps, the user may select a pre-defined size scheme. Pass the scheme object to this property to avoid getting one based on the view's background.

symbolType String

optional

Default Value: 2d

The type of symbol to generate. This depends on the view in which you are working and the desired visualization. This parameter does not need to be specified for layers with a mesh geometry type. Possible values are described below.

Value	Description
2d	Generates a visualization using 2D symbols such as SimpleMarkerSymbol, SimpleLineSymbol, or SimpleFillSymbol. Use this option if generating a visualization for data in a MapView.
3d-flat	Generates a visualization using 3D symbols with flat symbol layers such as IconSymbol3DLayer, LineSymbol3DLayer, or FillSymbol3DLayer. Use this option if generating a 2D visualization for data in a SceneView.
3d-volumetric	Generates a visualization using 3D symbols with volumetric symbol layers such as ObjectSymbol3DLayer, PathSymbol3DLayer, or ExtrudeSymbol3DLayer. Use this option if generating a 3D visualization for data in a SceneView. A SceneView instance must be provided to the `view` parameter if this option is used.
3d-volumetric-uniform	Generates a visualization using uniformly sized 3D symbols with volumetric symbol layers. Use this option if generating a 3D visualization for data in a SceneView and the symbol should be sizes uniformly, for example with spheres. A SceneView instance must be provided to the `view` parameter if this option is used.

Possible Values:"2d"|"3d-flat"|"3d-volumetric"|"3d-volumetric-uniform"

defaultSymbolEnabled Boolean

optional

Default Value: true

Enables the defaultSymbol on the renderer and assigns it to features with no value.

signal AbortSignal

optional

Allows for cancelable requests. If canceled, the promise will be rejected with an error named AbortError. See also AbortController.

Returns

Type	Description
Promise<AgeRendererResult>	Resolves to an instance of AgeRendererResult.

Examples

const layer = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/311_Service_Requests_from_2015_50k/FeatureServer/0"
});

// visualization based age of incidents closed passed their due date
// or the number of days an incident was overdue at the time of closure.

const ageParams = {
  layer: layer,
  view: view,
  startTime: "Due_Date",
  endTime: "Closed_Date",
  unit: "days"
};

// when the promise resolves, apply the renderer to the layer
sizeRendererCreator.createAgeRenderer(ageParams)
  .then(function(response){
    layer.renderer = response.renderer;
  });

const layer = new CSVLayer({
  url: "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_week.csv",
  copyright: "USGS Earthquakes"
});

// visualization based off current age of incident
const ageParams = {
  layer: layer,
  view: view,
  startTime: "time",
  endTime: Date.now(),
  legendOptions: {
    title: "Time since earthquake struck"
  }
};

// when the promise resolves, apply the renderer to the layer
sizeRendererCreator.createAgeRenderer(ageParams)
  .then(function(response){
    layer.renderer = response.renderer;
  });

createClassBreaksRenderer Method createClassBreaksRenderer(params){Promise<ClassBreaksRendererResult>} Since: ArcGIS Maps SDK for JavaScript 4.6 size since 4.2, createClassBreaksRenderer added at 4.6.

Generates a ClassBreaksRenderer that may be applied directly to the layer used to call this method. The resulting renderer defines the symbol size of each feature based on the value of the given field value. A default size scheme is determined based on the background of the view. Depending on the classificationMethod, class breaks (or data ranges) are generated based on the statistics of the data. Each feature is assigned a size based on the class break in which the value of the field falls.

In most cases you will provide a layer, view, field, and classificationMethod to generate this renderer. This is a scenario in which the statistics of the data aren't well known and the user doesn't know what sizes to use in the visualization. You can also use a valueExpression instead of a field to visualize features based on a value returned from a script executed at runtime.

The other options are provided for convenience for more involved custom visualization authoring applications.

Parameters

Specification

params Object

Input parameters for generating a classed size visualization based on data returned from a given field or expression. See the table below for details of each parameter.

Specification

The layer for which the visualization is generated.

view View

optional

The view where the input layer is rendered. This method inspects the view's background (i.e. basemap, web map background, or view container) to determine optimal colors for the output renderer. This parameter should always be set in practice, but if not provided this method will assume the generated renderer will display on a light background. This parameter is required when creating renderers using a valueExpression or for renderers intended for display in a SceneView.

field String

optional

The name of the field whose data will be queried for statistics and classified. This property is ignored if a valueExpression is used.

normalizationField String

optional

The name of the field to normalize the values of the given field. Providing a normalization field helps minimize some visualization errors and standardizes the data so all features are visualized with minimal bias due to area differences or count variation. This option is commonly used when visualizing densities.

normalizationType String

optional

Indicates how the data is normalized. 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 `field` value by the value of `normalizationField`. 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"

normalizationTotal Number

optional

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

classificationMethod String

optional

Default Value: equal-interval

The classification method used for generating breaks. See the table below for a list of possible values.

Possible Value	Description
equal-interval	Divides the range of attribute values into equal-sized subranges. For example, if you specify three classes for a field whose values range from 0 to 300, this method will create three classes with ranges of 0–100, 101–200, and 201–300. Equal interval is best applied to familiar data ranges, such as percentages and temperature. This method emphasizes the amount of an attribute value relative to other values. For example, it could show if a store is part of the group of stores that make up the top one-third of all sales.
natural-breaks	Groups similar values that maximize the differences between classes. Features are divided into classes whose boundaries are set where there are relatively big differences in the data values. Natural breaks are data-specific classifications and not useful for comparing multiple maps built from different underlying information.
quantile	Assigns the same number of data values to each class. This is well suited to linearly distributed data. Because features are grouped in equal numbers in each class, the resulting map can often be misleading. Similar features can potentially be placed in adjacent classes, or features with widely different values can be put in the same class. You can minimize this distortion by increasing the number of classes.
standard-deviation	Creates class breaks with equal value ranges that are a proportion of the standard deviation. This is usually done at intervals of one, one-half, one-third, or one-fourth standard deviations from the mean.

Possible Values:"equal-interval"|"natural-breaks"|"quantile"|"standard-deviation"

standardDeviationInterval Number

optional

Default Value: 1

If a standard-deviation classification method is used, then this indicates the interval by which to generate class breaks.

Possible Values: 1 | 0.5 | 0.33 | 0.25

numClasses Number

optional

Default Value: 5

The number of class breaks to generate. This is ignored if a standard-deviation classification method is specified.

sizeScheme SizeScheme

optional

In authoring apps, the user may select a pre-defined size scheme. Pass the scheme object to this property to avoid getting one based on the view's background.

valueExpression String

optional

An Arcade expression following the specification defined by the Arcade Visualization Profile. Expressions may reference field values using the $feature profile variable and must return a number. This property overrides the field property and therefore is used instead of an input field value.

valueExpressionTitle String

optional

Text describing the value returned from the valueExpression. This is used by the Legend widget.

sqlExpression String

optional

A SQL expression evaluating to a number.

sqlWhere String

optional

A SQL where clause used to filter features for the statistics query. For example, this is useful in situations where you want to avoid dividing by zero as is the case with creating a predominance visualization.

outlineOptimizationEnabled Boolean

optional

Default Value: false

legendOptions Object

optional

Provides options for setting a title to describe a field instead of using the field name. This title will represent the field in the Legend.

Specification

title String

optional

The title used to represent the given field or expression in the Legend.

minValue Number

optional

A minimum value set by the user. Use this in conjunction with maxValue to generate class breaks between lower and upper bounds. This will be the lower bound of the lowest class break.

maxValue Number

optional

A maximum value set by the user. Use this in conjunction with minValue to generate class breaks between lower and upper bounds. This will be the upper bound of the highest class break.

defaultSymbolEnabled Boolean

optional

Default Value: true

Enables the defaultSymbol on the renderer and assigns it to features with no value and features that do not fall within the configured data range.

symbolType String

optional

Default Value: 2d

The type of symbol to generate. This depends on the view in which you are working and the desired visualization. Possible values are described below.

Value	Description
2d	Generates a visualization using 2D symbols such as SimpleMarkerSymbol, SimpleLineSymbol, or SimpleFillSymbol. Use this option if generating a visualization for data in a MapView.
3d-flat	Generates a visualization using 3D symbols with flat symbol layers such as IconSymbol3DLayer, LineSymbol3DLayer, or FillSymbol3DLayer. Use this option if generating a 2D visualization for data in a SceneView.
3d-volumetric	Generates a visualization using 3D symbols with volumetric symbol layers such as ObjectSymbol3DLayer, PathSymbol3DLayer, or ExtrudeSymbol3DLayer. Use this option if generating a 3D visualization for data in a SceneView and only the symbol's height should be variable, for example with cylinders. A SceneView instance must be provided to the `view` parameter if this option is used.
3d-volumetric-uniform	Generates a visualization using uniformly sized 3D symbols with volumetric symbol layers. Use this option if generating a 3D visualization for data in a SceneView and the symbol should be sized uniformly, for example with spheres. A SceneView instance must be provided to the `view` parameter if this option is used.

Possible Values:"2d"|"3d-flat"|"3d-volumetric"|"3d-volumetric-uniform"

forBinning Boolean

optional

Indicates whether the generated renderer is for a binning visualization. If true, then the input field(s) in this method should refer to aggregate fields defined in the featureReduction property of the layer.

signal AbortSignal

optional

Allows for cancelable requests. If canceled, the promise will be rejected with an error named AbortError. See also AbortController.

Returns

Type	Description
Promise<ClassBreaksRendererResult>	Resolves to an instance of ClassBreaksRendererResult.

Examples

const layer = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/counties_politics_poverty/FeatureServer/0"
});

// visualization based on field and normalization field
const sizeParams = {
  layer: layer,
  view: view,
  field: "POP_POVERTY",
  normalizationField: "TOTPOP_CY",
  classificationMethod: "quantile",
  numClasses: 4
};

// when the promise resolves, apply the renderer to the layer
sizeRendererCreator.createClassBreaksRenderer(sizeParams)
  .then(function(response){
    layer.renderer = response.renderer;
  });

const layer = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/counties_politics_poverty/FeatureServer/0"
});

// visualization based off Arcade expression
const sizeParams = {
  layer: layer,
  classificationMethod: "equal-interval",
  valueExpression: "($feature.POP_POVERTY / $feature.TOTPOP_CY) * 100",
  view: view,
  legendOptions: {
    title: "% of people living in poverty"
  }
};

// when the promise resolves, apply the renderer to the layer
sizeRendererCreator.createClassBreaksRenderer(sizeParams)
  .then(function(response){
    layer.renderer = response.renderer;
  });

createContinuousRenderer Method createContinuousRenderer(params){Promise<ContinuousRendererResult>}

Generates a Renderer that may be applied directly to the layer used to call this method. The renderer contains a continuous size visual variable that maps marker sizes to specific stop values based on queried statistics from the indicated field or expression.

In most cases you will provide a layer, view, and field to generate this renderer. This is a scenario in which the statistics of the data aren't well known and the user doesn't know what sizes to use in the visualization. You can also use a valueExpression instead of a field to visualize features based on a value returned from a script executed at runtime.

The other options are provided for convenience for more involved custom visualization authoring applications. For example, if you already generated statistics in another operation, you can pass the statistics object to the statistics parameter to avoid making an extra call to the server.

Parameters

Specification

params Object

Input parameters for generating size visual variables based on data returned from a given field or expression. See the table below for details of each parameter.

Specification

The layer for which the renderer is generated.

view View

optional

field String

optional

The name of the field whose data will be queried for statistics and used for the basis of the data-driven visualization. This property is ignored if a valueExpression is used.

normalizationField String

optional

sizeScheme SizeScheme

optional

In authoring apps, the user may select a pre-defined size scheme. Pass the scheme object to this property to avoid getting one based on the view's background.

valueExpression String

optional

valueExpressionTitle String

optional

Text describing the value returned from the valueExpression. This is used by the Legend widget.

theme String

optional

Default Value: high-to-low

Defines the size theme. For gridded datasets, the default is reference-size. For all other datasets, the default is high-to-low.

Value	Description
high-to-low	The max data value is assigned the max size. The min data value is assigned the min size. All other values are interpolated.
above	The max data value is assigned the max size. The average data value is assigned the min size. All other values between the max data value and the average are interpolated. This is useful for mapping an increase in a variable over time, like an increase in population, or unemployment between two dates.
below	The min data value is assigned the max size. The average data value, is assigned the min size. All other values between the min data value and the average are interpolated. This is useful for mapping a decline in a variable over time, like a decrease in population, or unemployment between two dates.
reference-size	Since 4.30 When defined, creates a proportional size renderer with an outer ring that functions as a reference line representing the maximum data value (or other threshold). The ring is proportionally filled by an inner dot based on the feature's data value specified in `field` (and `normalizationField` if defined). This is a good style for visualizing ratios and percentages. It works best for gridded datasets where geometries don't overlap, such as styles for binning (i.e. `forBinning = true`), hexbin layers, or any other layer created with data aggregated to tessellated shapes. This parameter only applies to layers with a `polygon` geometry type, or any layer that has binning enabled. This parameter is ignored if `valueExpression` is specified in lieu of a `field`.

Possible Values:"high-to-low"|"above"|"below"|"reference-size"

referenceSizeOptions Object

optional

Since 4.30 Options for specifying the symbol used in a reference size visualization.

Specification

symbolStyle String

optional

Default Value: "circle"

Defines the symbol shape to use in a reference size visualization. Using a circle shape works best across a variety of datasets, but other shape options are available for visualizing layers representing tessellated grids of other shapes.

Possible Values:"circle"|"diamond"|"hexagon-flat"|"hexagon-pointy"|"square"

sqlExpression String

optional

A SQL expression evaluating to a number.

sqlWhere String

optional

outlineOptimizationEnabled Boolean

optional

Default Value: false

sizeOptimizationEnabled Boolean

optional

Default Value: false

Indicates whether symbol sizes should vary based on view scale. When set, a valid MapView instance must be provided in the view parameter. This option is not supported for 3D SceneViews.

legendOptions Object

optional

Provides options for setting a title to a field when an expression is provided instead of a field name. This title will represent the field in the Legend.

Specification

title String

optional

The title used to represent the given field or expression in the Legend.

showLegend Boolean

optional

Indicates whether to describe the renderer in the legend.

statistics SummaryStatisticsResult

optional

A statistics object generated from the summaryStatistics function. If statistics for the field have already been generated, then pass the object here to avoid making a second statistics query to the server.

minValue Number

optional

A custom minimum value set by the user. Use this in conjunction with maxValue to generate statistics between lower and upper bounds. This will be the lowest stop in the returned size visual variable.

maxValue Number

optional

A custom maximum value set by the user. Use this in conjunction with minValue to generate statistics between lower and upper bounds. This will be the uppermost stop in the returned size visual variable.

defaultSymbolEnabled Boolean

optional

Default Value: true

Enables the defaultSymbol on the renderer and assigns it to features with no value and features that do not fall within the configured data range.

symbolType String

optional

Default Value: 2d

The type of symbol to generate. This depends on the view in which you are working and the desired visualization. Possible values are described below.

Value	Description
2d	Generates a visualization using 2D symbols such as SimpleMarkerSymbol, SimpleLineSymbol, or SimpleFillSymbol. Use this option if generating a visualization for data in a MapView.
3d-flat	Generates a visualization using 3D symbols with flat symbol layers such as IconSymbol3DLayer, LineSymbol3DLayer, or FillSymbol3DLayer. Use this option if generating a 2D visualization for data in a SceneView.
3d-volumetric	Generates a visualization using 3D symbols with volumetric symbol layers such as ObjectSymbol3DLayer, PathSymbol3DLayer, or ExtrudeSymbol3DLayer. Use this option if generating a 3D visualization for data in a SceneView and only the symbol's height should be variable, for example with cylinders. A SceneView instance must be provided to the `view` parameter if this option is used.
3d-volumetric-uniform	Generates a visualization using uniformly sized 3D symbols with volumetric symbol layers. Use this option if generating a 3D visualization for data in a SceneView and the symbol should be sized uniformly, for example with spheres. A SceneView instance must be provided to the `view` parameter if this option is used.

Possible Values:"2d"|"3d-flat"|"3d-volumetric"|"3d-volumetric-uniform"

forBinning Boolean

optional

signal AbortSignal

optional

Allows for cancelable requests. If canceled, the promise will be rejected with an error named AbortError. See also AbortController.

Returns

Type	Description
Promise<ContinuousRendererResult>	Resolves to an instance of ContinuousRendererResult.

Examples

const layer = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/counties_politics_poverty/FeatureServer/0"
});

// visualization based on field and normalization field
const sizeParams = {
  layer: layer,
  view: view,
  field: "POP_POVERTY",
  normalizationField: "TOTPOP_CY"
};

// when the promise resolves, apply the renderer to the layer
sizeRendererCreator.createContinuousRenderer(sizeParams)
  .then(function(response){
    layer.renderer = response.renderer;
  });

const layer = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/counties_politics_poverty/FeatureServer/0"
});

// visualization based off Arcade expression
const sizeParams = {
  layer: layer,
  valueExpression: "($feature.POP_POVERTY / $feature.TOTPOP_CY) * 100",
  view: view,
  legendOptions: {
    title: "% of people living in poverty"
  },
  theme: "above"
};

// when the promise resolves, apply the renderer to the layer
sizeRendererCreator.createContinuousRenderer(sizeParams)
  .then(function(response){
    layer.renderer = response.renderer;
  });

createVisualVariables Method createVisualVariables(params){Promise<VisualVariableResult>}

This method generates an array of size visual variables with default stops that are optimally chosen based on the statistics queried for the indicated field or expression and mapped to appropriate sizes.

There are two different ways this method may be called. The most common case is by providing a layer, view, and field. This is the scenario where the statistics of the data aren't well known and the user doesn't know what sizes to use. You can optionally use a valueExpression instead of a field to visualize features based on a numeric value returned from a script executed at runtime.

The other options are provided for convenience for more involved custom visualization authoring applications. For example, if you already generated statistics in another operation, you can pass the object in the statistics parameter to avoid making an extra call to the server. You can also provide a sizeScheme if you don't want one picked for you. In this case the theme options would be ignored.

The resulting array of visual variables will contain exactly one size visual variable unless the axis parameter is set to "height".

Parameters

Specification

params Object

Input parameters for generating size visual variables based on data returned from a given field or expression. See the table below for details of each parameter.

Specification

The layer for which the visual variables are generated.

view View

optional

field String

The name of the field whose data will be queried for statistics and used for the basis of the data-driven visualization. This property is ignored if a valueExpression is used.

normalizationField String

optional

sizeScheme SizeScheme

optional

In authoring apps, the user may select a pre-defined size scheme. Pass the scheme object to this property to avoid getting one based on the view's background.

valueExpression String

optional

valueExpressionTitle String

optional

Text describing the value returned from the valueExpression. This is used by the Legend widget.

theme String

optional

Default Value: high-to-low

Sets the size stops based on meaningful data values.

Value	Description
high-to-low	The max data value is assigned the max size. The min data value is assigned the min size. All other values are interpolated.
above	The max data value is assigned the max size. The average data value is assigned the min size. All other values between the max data value and the average are interpolated. This is useful for mapping an increase in a variable over time, like an increase in population, or unemployment between two dates.
below	The min data value is assigned the max size. The average data value, is assigned the min size. All other values between the min data value and the average are interpolated. This is useful for mapping a decline in a variable over time, like a decrease in population, or unemployment between two dates.

Possible Values:"high-to-low"|"above"|"below"

referenceSizeOptions Object

optional

Since 4.30 When defined, creates a proportional size renderer with an outer ring that functions as a reference line representing a maximum data value (or threshold). The ring is proportionally filled by an inner dot based on the feature's data value specified in field (and normalizationField if defined). This is a good style for visualizing ratios and percentages. It works best for gridded datasets where geometries don't overlap, such as styles for binning (i.e. forBinning = true), hexbin layers, or any other layer created with data aggregated to tessellated shapes. This parameter only applies to layers with a polygon geometry type, or any layer that has binning enabled. This parameter is ignored if valueExpression is specified in lieu of a field.

Specification

symbolStyle String

optional

Possible Values:"circle"|"diamond"|"hexagon-flat"|"hexagon-pointy"|"square"

sqlExpression String

optional

A SQL expression evaluating to a number.

sqlWhere String

optional

sizeOptimizationEnabled Boolean

optional

Default Value: false

Indicates whether symbol sizes should vary based on view scale. When set, a valid MapView instance must be provided in the view parameter. This option is not supported for 3D SceneViews.

legendOptions Object

optional

Provides options for setting a title to a field when an expression is provided instead of a field name. This title will represent the field in the Legend.

Specification

title String

optional

The title used to represent the given field or expression in the Legend.

showLegend Boolean

optional

Indicates whether to describe the renderer in the legend.

statistics SummaryStatisticsResult

optional

minValue Number

optional

maxValue Number

optional

worldScale Boolean

optional

Indicates if the size units of the symbols will be in meters. This should be true when generating visualizations with 3D volumetric symbology.

axis String

optional

Default Value: all

When set to all, a single size variable that scales uniformly in all dimensions is generated. When set to height, the result contains two size visual variables: the first one sizes the height according to the field statistics, while the second defines a constant size for width and depth.

Possible Values:"all"|"height"

forBinning Boolean

optional

signal AbortSignal

optional

Allows for cancelable requests. If canceled, the promise will be rejected with an error named AbortError. See also AbortController.

Returns

Type	Description
Promise<VisualVariableResult>	Resolves to an instance of VisualVariableResult.

Examples

const layer = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/counties_politics_poverty/FeatureServer/0"
});

// visualization based on field and normalization field
const sizeParams = {
  layer: layer,
  view: view,
  field: "POP_POVERTY",
  normalizationField: "TOTPOP_CY",
  theme: "below"
};

// when the promise resolves, apply the visual variables to the renderer
sizeRendererCreator.createVisualVariables(sizeParams)
  .then(function(response){
    const renderer = layer.renderer.clone();
    renderer.visualVariables = response.visualVariables;
    layer.renderer = renderer;
  });

const layer = new FeatureLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/counties_politics_poverty/FeatureServer/0"
});

// visualization based off Arcade expression
const sizeParams = {
  layer: layer,
  valueExpression: "($feature.POP_POVERTY / $feature.TOTPOP_CY) * 100",
  view: view,
  legendOptions: {
    title: "% of people living in poverty"
  }
};

// when the promise resolves, apply the visual variables to the renderer
sizeRendererCreator.createVisualVariables(sizeParams)
  .then(function(response){
    const renderer = layer.renderer.clone();
    renderer.visualVariables = response.visualVariables;
    layer.renderer = renderer;
  });

updateRendererWithReferenceSize Method updateRendererWithReferenceSize(params){Promise<(ClassBreaksRenderer|UniqueValueRenderer)>} Since: ArcGIS Maps SDK for JavaScript 4.30 size since 4.2, updateRendererWithReferenceSize added at 4.30.

Updates a renderer generated from createContinuousRenderer() that uses a specialty reference size variable (i.e. AuthoringInfoVisualVariable.theme is set to reference-size). This would have already been generated in createContinuousRenderer.

Parameters

Specification

params Object

Input parameters for updating an existing reference size visualization. See the table below for details of each parameter.

Specification

The layer for which the renderer is updated.

renderer ClassBreaksRenderer|UniqueValueRenderer

optional

The renderer instance to update if not already set on the layer.

view View

The view where the input layer is rendered.

field String

optional

The name of a numeric field used to dynamically change the inner dot size.

normalizationField String

optional

The name of a numeric field use to normalize the data in the input field.

sizeStops SizeStop []

The size stops with which to update the reference size visualization. These values typically come from SizeSlider.stops.

referenceSizeOptions Object

optional

Updates the symbol shape used in the reference size visualization.

Specification

symbolStyle String

optional

Possible Values:"circle"|"diamond"|"hexagon-flat"|"hexagon-pointy"|"square"

sizeScheme SizeScheme

optional

Use this property to update the color of the symbols.

typeScheme TypeScheme

optional

Only valid for reference size visualizations implemented in a UniqueValueRenderer. The scheme updates the colors of each category.

sizeOptimizationEnabled Boolean

optional

Default Value: false

Indicates whether symbol sizes should vary based on view scale. When set, a valid MapView instance must be provided in the view parameter. For gridded layers (i.e. isGrid is true), size optimization is always enabled and therefore this parameter is ignored.

forBinning Boolean

optional

Indicates whether the renderer is intended for a binning visualization. If true, then the input field(s) in this method should refer to aggregate fields defined in the featureReduction property of the layer.

Returns

Type	Description
Promise<(ClassBreaksRenderer\|UniqueValueRenderer)>	Resolves to the updated renderer with a specialty reference size variable.

Example

sizeSlider.on(["thumb-change", "thumb-drag"], async () => {
  // layer.renderer must already have a reference size variable
  const isReferenceSize = layer.renderer?.authoringInfo?.visualVariables.some(
    (vv) => vv.theme === "reference-size"
  );

  if(isReferenceSize){
    const renderer = await updateRendererWithReferenceSize({
      layer,
      view,
      sizeStops: sizeSlider.stops
    });
    layer.renderer = renderer;
   }
});

Type Definitions

AgeRendererResult Type Definition AgeRendererResult Since: ArcGIS Maps SDK for JavaScript 4.9 size since 4.2, AgeRendererResult added at 4.9.

The result object of the createAgeRenderer() method. See the table below for details of each property.

Properties: renderer ClassBreaksRenderer

The renderer object configured to best match the view's background and the spread of the data. Set this on a layer's renderer property to update its visualization.

visualVariables SizeVariable []

Size visual variables configured based on the statistics of the data and the size scheme.

unit String

The time unit used to represent age in the output renderer.

sizeScheme SizeScheme

The size scheme used by the visual variables.

defaultValuesUsed Boolean

Indicates whether default values are used in the absence of sufficient data and/or statistics from the layer. Default values are typically used when all features have the same field value or no value at all.

statistics SummaryStatisticsResult

Basic statistics returned from a query for the generated expression.

basemapId String

The ID of the basemap used to determine the optimal fill color of the features.

basemapTheme String

Indicates whether the average color of the input view's basemap is light or dark.

ClassBreaksRendererResult Type Definition ClassBreaksRendererResult Since: ArcGIS Maps SDK for JavaScript 4.6 size since 4.2, ClassBreaksRendererResult added at 4.6.

The result object of the createClassBreaksRenderer() method. See the table below for details of each property.

Properties: renderer ClassBreaksRenderer

The renderer object configured to best match the view's background and the spread of the data. Set this on a layer's renderer property to update its visualization.

classBreaksResult ClassBreaksResult

This object describes class breaks generated from data in a layer for a given field with a specified classification method.

sizeScheme SizeScheme

The size scheme used by the visual variables.

defaultValuesUsed Boolean

Indicates whether default values are used in the absence of sufficient data and/or statistics from the layer. Default values are typically used when all features have the same field value or no value at all.

basemapId String

The ID of the basemap used to determine the optimal fill color of the features.

basemapTheme String

Indicates whether the average color of the input view's basemap is light or dark.

ContinuousRendererResult Type Definition ContinuousRendererResult

The result object of the createContinuousRenderer() method. See the table below for details of each property.

Properties: renderer ClassBreaksRenderer

The renderer object configured to best match the background of the view and the spread of the data. Set this on a layer's renderer property to update its visualization.

visualVariables SizeVariable []

Size visual variables configured based on the statistics of the data.

sizeScheme SizeScheme

The size scheme used by the visual variables.

defaultValuesUsed Boolean

Indicates whether default values are used in the absence of sufficient data and/or statistics from the layer. Default values are typically used when all features have the same field value or no value at all.

statistics SummaryStatisticsResult

Basic statistics returned from a query to the service for data from the given field name or expression.

basemapId String

The ID of the basemap used to determine the optimal fill color of the features.

basemapTheme String

Indicates whether the average color of the input view's basemap is light or dark.

isGrid Boolean

optional
Since 4.30 Indicates if the polygon layer used to generate the renderer was determined to be gridded. This is done when referenceSizeOptions are set for creating a reference size visualization.

VisualVariableResult Type Definition VisualVariableResult

The result object of the createVisualVariables() method. See the table below for details of each property.

Properties: visualVariables SizeVariable []

An array of size visual variables configured based on the statistics of the data and the view scale.

sizeScheme SizeScheme

The size scheme used by the main visual variable.

defaultValuesUsed Boolean

Indicates whether default values were used in the absence of sufficient data and/or statistics from the layer. Default values are typically used when all features have the same field value or no value at all.

statistics SummaryStatisticsResult

Basic statistics returned from a query to the service for the given field or expression.

basemapId String

The ID of the basemap used to determine the optimal fill color of the features.

basemapTheme String

Indicates whether the average color of the input view's basemap is light or dark.

authoringInfo AuthoringInfo

Authoring information related to the creation of the visual variable. This includes information related to UI inputs from sliders and selected themes.

isGrid Boolean

optional
Since 4.30 Indicates if the polygon layer used to generate the renderer was determined to be gridded. This is done when referenceSizeOptions are set for creating a reference size visualization.