symbolUtils

AMD: require(["esri/symbols/support/symbolUtils"], (symbolUtils) => { /* code goes here */ });
ESM: import * as symbolUtils from "@arcgis/core/symbols/support/symbolUtils.js";
Object: esri/symbols/support/symbolUtils
Since: ArcGIS Maps SDK for JavaScript 4.11

Utilities for generating small preview images of symbols.

Method Overview

Name Return Type Summary Object

Returns a color representing the input graphic's symbol.

symbolUtils

Returns a symbol representing the input Graphic.

symbolUtils

Returns a label corresponding to the symbol of the input Graphic as displayed in the Legend.

symbolUtils

Generates a preview image of a color ramp to display in a DOM element.

symbolUtils

Generates an HTML element representing the legend of a PieChartRenderer.

symbolUtils

Generates a preview image of a given symbol that can be displayed in a DOM element.

symbolUtils

Generates an HTML element representing the square or diamond legend element of a relationship renderer.

symbolUtils

Method Details

getDisplayedColor

Method
getDisplayedColor(graphic, options){Promise<Color>}
Since: ArcGIS Maps SDK for JavaScript 4.19 symbolUtils since 4.11, getDisplayedColor added at 4.19.

Returns a color representing the input graphic's symbol. This method is useful when you need to know the exact color of a Graphic's symbol, particularly when the graphic comes from the result of a hitTest() and its symbol properties may be empty. A symbol's properties won't be populated when a Renderer defines the visualization of a layer rather than symbols set individually on each graphic of a layer. This is the case for FeatureLayer, and any other layer that has a renderer property.

Parameters
Specification
graphic Graphic

The graphic from which to retrieve the displayed color. This commonly comes from a hitTest() or layer view query operation.

options Object
optional

Options for generating the display color of the input graphic. These must be specified if the input graphic comes from a layer with a renderer that has visual variables applied. See the object specification below.

Specification
scale Number
optional

The view scale at which the graphic is displayed.

viewingMode String
optional

The viewingMode of the view, if the graphic is displayed in a SceneView.

spatialReference SpatialReference
optional

The spatial reference of the view in which the graphic is displayed.

renderer Renderer
optional

The renderer of the layer associated with the graphic.

resolution Number
optional

The resolution of the view at which the graphic is displayed.

Returns
Type Description
Promise<Color> Returns the color representing the input graphic.
Example
view.on("click", async (event) => {
  const { results } = await view.hitTest(event, { include: layer });
  const graphic = results[0].graphic;

  // do something with the result color
  const color = await symbolUtils.getDisplayedColor(graphic);
});

getDisplayedSymbol

Method
getDisplayedSymbol(graphic, options){Promise<Symbol>}

Returns a symbol representing the input Graphic. This method is useful when you need to know the exact visual properties of a Graphic's symbol, particularly when the graphic comes from the result of a hitTest() and its symbol properties may be empty. A symbol's properties won't be populated when a Renderer defines the visualization of a layer rather than symbols set individually on each graphic of a layer. This is the case for FeatureLayer, and any other layer that has a renderer property.

Parameters
Specification
graphic Graphic

The graphic from which to retrieve the displayed symbol. This commonly comes from a hitTest() operation.

options Object
optional

Options for generating the display symbol of the input graphic. These must be specified if the input graphic comes from a layer with a renderer that has visual variables applied. See the object specification below.

Specification
scale Number
optional

The view scale at which the symbol is displayed.

viewingMode String
optional

The viewingMode of the view, if the symbol is displayed in a SceneView.

spatialReference SpatialReference
optional

The spatial reference of the view in which the symbol is displayed.

renderer Renderer
optional

The renderer of the layer associated with the graphic.

resolution Number
optional

The resolution of the view at which the symbol is displayed.

Returns
Type Description
Promise<Symbol> Returns the symbol representing the input graphic.
Example
view.on("click", async (event) => {
  const { results } = await view.hitTest(event, { include: layer });
  const graphic = results[0].graphic;

  // do something with the result symbol
  const symbol = await symbolUtils.getDisplayedSymbol(graphic, {
    scale: view.scale,
    spatialReference: view.spatialReference,
    resolution: view.resolution
  });
});

getLegendLabel

Method
getLegendLabel(graphic, view, options){Promise<string>}
Since: ArcGIS Maps SDK for JavaScript 4.29 symbolUtils since 4.11, getLegendLabel added at 4.29.

Returns a label corresponding to the symbol of the input Graphic as displayed in the Legend.

Parameters
Specification
graphic Graphic

The graphic from which to retrieve its associated label as displayed in the legend widget. This commonly comes from a hitTest() operation.

optional

The graphic from which to retrieve the displayed symbol. This commonly comes from a hitTest() operation.

options Object
optional

Options for generating the legend label of the input graphic. These must be specified if the input graphic comes from a layer with a renderer that has visual variables applied. See the object specification below.

Specification
scale Number
optional

The view scale at which the symbol is displayed.

viewingMode String
optional

The viewingMode of the view, if the symbol is displayed in a SceneView.

spatialReference SpatialReference
optional

The spatial reference of the view in which the symbol is displayed.

renderer Renderer
optional

The renderer of the layer associated with the graphic.

resolution Number
optional

The resolution of the view at which the symbol is displayed.

Returns
Type Description
Promise<string> Returns the label representing the input graphic in the legend.
Example
view.on("click", async (event) => {
  const { results } = await view.hitTest(event, { include: layer });
  const graphic = results[0].graphic;

  // do something with the result symbol
  const label = await symbolUtils.getLegendLabel(graphic, view, {
    scale: view.scale,
    spatialReference: view.spatialReference,
    resolution: view.resolution
  });
});

renderColorRampPreviewHTML

Method
renderColorRampPreviewHTML(colors, options){HTMLElement}
Since: ArcGIS Maps SDK for JavaScript 4.13 symbolUtils since 4.11, renderColorRampPreviewHTML added at 4.13.

Generates a preview image of a color ramp to display in a DOM element.

Parameters
Specification
colors Color[]

An array of colors from which to construct the color ramp.

options Object
optional

Formatting options for the color ramp.

Specification
align String
optional
Default Value: vertical

Specifies the alignment of the color ramp.

Possible Values:"horizontal"|"vertical"

gradient Boolean
optional
Default Value: true

Indicates whether to render the color ramp with a continuous gradient. When false, distinct colors will appear in the ramp without a gradient.

width Number
optional

The width of the ramp in pixels.

height Number
optional

The height of the ramp in pixels.

Returns
Type Description
HTMLElement Returns a preview of the color ramp for display in the DOM.
Examples
const colors = [
  "#d6ffe1",
  "#8ceda6",
  "#2ee860",
  "#00e33d"
];

const colorRamp = symbolUtils.renderColorRampPreviewHTML(colors, {
  align: "vertical"
});

body.appendChild(colorRamp);
// Primary color scheme from colorSchemes.getSchemes()
const schemes = colorSchemes.getSchemes({
  basemap: "gray-vector",
  geometryType: "polygon",
  theme: "above-and-below"
});

const colorRamp = symbolUtils.renderColorRampPreviewHTML(schemes.primaryScheme.colors, {
  align: "horizontal"
});

body.appendChild(colorRamp);

renderPieChartPreviewHTML

Method
renderPieChartPreviewHTML(colors, options){HTMLElement}
Since: ArcGIS Maps SDK for JavaScript 4.26 symbolUtils since 4.11, renderPieChartPreviewHTML added at 4.26.

Generates an HTML element representing the legend of a PieChartRenderer. Use this method to display the pie chart legend element in a DOM element.

Parameters
Specification
colors Color[]

A list of colors used to render the pie chart.

options Object
optional

Options for creating the legend element.

Specification
radius Number
optional
Default Value: 40

The radius of the pie chart in pixels.

holePercentage Number
optional
Default Value: 0

The hole percentage of the chart on a scale of 0-1. A percentage of 0 creates a pie chart. Any other value creates a donut chart. This value indicates the percentage of the chart to remove from the center.

values Number[]
optional

The values used to indicate the area each color should represent as a percentage when creating the pie chart. The number of values should match the number of colors. Value positions correspond with the positions of colors in the colors array. For example, if the first color in the colors array is red and the first value in the values array is 50, then 50% of the chart should be represented with red. The sum of all values defined here must equal 100. By default all colors are given an equal area.

optional

The outline of the pie chart.

Returns
Type Description
HTMLElement Returns the of the pie chart legend element to display in the DOM.
Example
const { attributes, size, holePercentage, outline } = layer.renderer;
const colors = attributes.map( attribute => attribute.color );

const element = symbolUtils.renderPieChartPreviewHTML(colors, {
  radius: size * 0.5,
  holePercentage,
  values: [10,70,20],
  outline
});

legendElement.appendChild(element);

renderPreviewHTML

Method
renderPreviewHTML(symbol, options){Promise<HTMLElement>}

Generates a preview image of a given symbol that can be displayed in a DOM element.

Parameters
Specification
symbol Symbol

The symbol for which to generate a preview image.

options Object
optional

Formatting options for the symbol preview image.

Specification
optional

The parent node to append to the symbol.

size Number|Object
optional

Use a number to set the size (in points) of the symbol preview for any symbol representing a point. Starting at version 4.23, you can provide an object with width and height properties when creating symbol previews for simple symbols. At version 4.25, the width and height properties are supported on all symbols.

Specification
width Number
optional

The width of the symbol preview in points. Previews for SimpleFillSymbol must have isSquareFill enabled in symbolConfig for this property to take effect.

height Number
optional

The height of the symbol preview in points. Previews for SimpleFillSymbol must have isSquareFill enabled in symbolConfig for this property to take effect.

maxSize Number
optional

The maximum size of the symbol preview in points.

opacity Number
optional

The opacity of the layer represented by the symbol. Must be a number between 0 and 1.

scale Boolean
optional
Default Value: true

When true the size of the symbol preview will include the outline in the measurement of the entire symbol. When false, the symbol preview will not include the outline in the size measurement, thus matching the symbol size in the view.

disableUpsampling Boolean
optional

Indicates whether to disable upsampling for raster images.

symbolConfig Object|String
optional

Options for setting the shape of a fill symbol preview. This can be a single string value (tall is the only option), or an object with config options. See the table below for specifics on the configuration options available.

Possible Values:"tall"

Specification
isTall Boolean
optional
Default Value: false

Set to true for "tall" symbols in portrait view. This is typically used for 3D cylinder object symbols.

isSquareFill Boolean
optional
Default Value: false

Set to true to render the preview as a square instead of a generic polygon shape.

rotation Number
optional

The rotation of the symbol.

overrideText String
optional

Since 4.25 The text that will be displayed in the symbol preview of a TextSymbol. This will override any existing text defined on the symbol.

Returns
Type Description
Promise<HTMLElement> Returns a preview of the given symbol to display to the DOM.
Example
// symbol from SimpleRenderer;
const symbol = layer.renderer.symbol.clone();

symbolUtils.renderPreviewHTML(symbol, {
  node: document.getElementById("preview"),
  size: 8
});

renderRelationshipRampPreviewHTML

Method
renderRelationshipRampPreviewHTML(renderer, options){HTMLElement}
Since: ArcGIS Maps SDK for JavaScript 4.26 symbolUtils since 4.11, renderRelationshipRampPreviewHTML added at 4.26.

Generates an HTML element representing the square or diamond legend element of a relationship renderer. Use this method to display the relationship legend element in a DOM element.

Parameters
Specification

A relationship renderer instance.

options Object
optional

Options for creating the legend element.

Specification
optional

The container node in which to place the generated relationship element.

opacity Number
optional
Default Value: 1

The opacity of the legend element.

Returns
Type Description
HTMLElement Returns the relationship legend element to display in the DOM.
Example
const relationshipElement = symbolUtils.renderRelationshipRampPreviewHTML(layer.renderer);
body.appendChild(relationshipElement);

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