ExpressionInfo

AMD: require(["esri/form/ExpressionInfo"], (ExpressionInfo) => { /* code goes here */ });
ESM: import ExpressionInfo from "@arcgis/core/form/ExpressionInfo";
Class: esri/form/ExpressionInfo
Inheritance: ExpressionInfo Accessor
Since: ArcGIS API for JavaScript 4.16

The ExpressionInfo class defines the Arcade expressions executed in a layer's FormTemplate. These expressions evaluate to either a number, string, array, or dictionary value on a feature-by-feature basis at runtime. The values display within the layer's form as if they are field values.

See also:

Constructors

new ExpressionInfo(properties)
Parameter:
properties Object
optional

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

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
Show inherited properties Hide inherited properties
Name Type Summary Class
Stringmore details

The name of the class.

more detailsAccessor
Stringmore details

An Arcade expression evaluating to either a string, number, dictionary, or array.

more detailsExpressionInfo
Stringmore details

The name of the expression.

more detailsExpressionInfo
Stringmore details

Indicates the return type of the Arcade expression.

more detailsExpressionInfo
Stringmore details

The title used to describe the value returned by the expression.

more detailsExpressionInfo

Property Details

declaredClass Stringreadonly inherited

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

expression String

An Arcade expression evaluating to either a string, number, dictionary, or array. This expression can reference field values using the $feature global variable and perform mathematical calculations and logical evaluations at runtime.

Example:
// Set a simple string to a feature layer's formTemplate
// referencing the value returned from an Arcade expression
expressionInfo.expression = "{expression/per-asian}% of the people in this tract are Asian.";
name String

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

returnType String

Indicates the return type of the Arcade expression.

Possible Values:"boolean"|"number"|"string"

Default Value:boolean
title String

The title used to describe the value returned by the expression.

Method Overview

Name Return Type Summary Class
ExpressionInfomore details

Creates a deep clone of the ExpressionInfo class.

more detailsExpressionInfo
*more details

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product.

more detailsExpressionInfo
Objectmore details

Converts an instance of this class to its ArcGIS portal JSON representation.

more detailsExpressionInfo

Method Details

clone(){ExpressionInfo}

Creates a deep clone of the ExpressionInfo class.

Returns:
Type Description
ExpressionInfo A deep clone of the ExpressionInfo instance.
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.
toJSON(){Object}

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.

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