// 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"
    }]
  }]
};

Property Overview

Property Details

declaredClassStringreadonly inherited

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

expressionString

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 popupTemplate's content
// referencing the value returned from an Arcade expression
expressionInfo.expression = "{expression/per-asian}% of the people in this tract are Asian.";

nameString

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}). See the code snippets below for more examples.

returnTypeString|Number

Indicates the return type of the Arcade expression.

titleString

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.

Method Overview

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 a product in the ArcGIS platform. 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() topic in the Guide for more information.

Returns:

Type	Description
Object	The ArcGIS portal JSON representation of an instance of this class.