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Showing content from https://developers.arcgis.com/javascript/latest/api-reference/esri-popup-ExpressionInfo.html below:

ExpressionInfo | API Reference | ArcGIS Maps SDK for JavaScript 4.33

ESM: import ExpressionInfo from "@arcgis/core/popup/ExpressionInfo.js";

CDN: const ExpressionInfo = await $arcgis.import("@arcgis/core/popup/ExpressionInfo.js");

Class: @arcgis/core/popup/ExpressionInfo

Since: ArcGIS Maps SDK for JavaScript 4.11

The ExpressionInfo class references Arcade expressions following the specification defined by the Arcade Popup Profile. Expressions must return a string or a number and may access data values from the feature, its layer, or other layers in the map or datastore with the $feature, $layer, $map, and $datastore profile variables.

Expression names are referenced in a layer's PopupTemplate and execute once a layer's popup is opened. The values display within the view's popup as if they are field values. They can be displayed in a table using the FieldInfo of the popupTemplate's content or referenced within a simple string.

See also

• Arcade Popup Profile

• Arcade Feature Reduction Popup Profile

• PopupTemplate

• Sample - Reference Arcade expressions in PopupTemplate

Example

// Display a table in the popup's content referencing two values
// one from a field, and another returned from an Arcade expression
layer.popupTemplate = {
  title: "Population in {NAME}",
  content: [{
    type: "fields",
    fieldInfos: [{
      fieldName: "POP_2015",
      label: "Total population (2015)",
      format: {
        digitSeparator: true
      }
    }, {
      fieldName: "expression/per-asian"
    }]
  }]
};

ExpressionInfo Constructor new ExpressionInfo(properties)

Parameter

optional

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

Show inherited properties Hide inherited properties

declaredClass

Inherited

Property declaredClass Stringreadonly

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

expression Property expression String

An Arcade expression following the specification defined by the Arcade Popup Profile. Expressions must return a string or a number and may access data values from the feature, its layer, or other layers in the map or datastore with the $feature, $layer, $map, and $datastore profile variables.

Example

// Calculates the percentage of the population that is Asian
expressionInfo.expression = "Text($feature.Asian / $feature.TOT_POP, '#.#%')";

The name of the expression. This is used to reference the value of the given expression in the popupTemplate's content property by wrapping it in curly braces and prefacing it with expression/ (e.g. {expression/expressionName}).

Example

expressionInfo.name = "percent-asian";

returnType Property returnType String

Indicates the return type of the Arcade expression.

Possible Values:"string" |"number"

The title used to describe the value returned by the expression in the popup. This will display if the value is referenced in a FieldInfo table.

Example

expressionInfo.title = "Percent Asian";

Show inherited methods Hide inherited methods

addHandles

Inherited

Method addHandles(handleOrHandles, groupKey)

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

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.

Creates a deep clone of the ExpressionInfo class.

Returns

Type Description ExpressionInfo A deep clone of the ExpressionInfo instance.

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.

Returns

Type Description * | null | undefined Returns a new instance of this class.

hasHandles

Inherited

Method hasHandles(groupKey){Boolean}

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");
}

removeHandles

Inherited

Method removeHandles(groupKey)

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");

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