Element

Class: esri/form/elements/Element
Inheritance: Element Accessor
Subclasses: FieldElement , GroupElement
Since: ArcGIS API for JavaScript 4.16

Form elements define what should display within the FormTemplate elements. There are two specific element types:

The Element class is a read-only base class which has no constructor.

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
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Name Type Summary Class
String

The name of the class.

more details
more detailsAccessor
String

The element's description providing the purpose behind it.

more details
more detailsElement
String

A string value containing the field alias.

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more detailsElement
String

The type of form element displayed.

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more detailsElement
String

A reference to an Arcade expression that returns a boolean value.

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more detailsElement

Property Details

declaredClass Stringreadonly inherited

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

description String

The element's description providing the purpose behind it.

label String

A string value containing the field alias. This is not to Arcade expressions as the title is used instead.

type Stringreadonly

The type of form element displayed.

Possible Values:"field"|"group"

visibilityExpression String

A reference to an Arcade expression that returns a boolean value. When this expression evaluates to true, the element is displayed. When the expression evaluates to false the element is not displayed. If no expression is provided, the default behavior is that the element is displayed. Care must be taken when defining a visibility expression for a non-nullable field i.e. to make sure that such fields either have default values or are made visible to users so that they can provide a value before submitting the form.

The referenced expression must be what is defined in the form template's expressionInfos. It cannot be set inline within the element object.

See also:
Example:
// Expression created within ExpressionInfos and is referenced in element
const expression = new ExpressionInfo({
  name: "alwaysHidden",
  expression: "1 == 0"
});

// Reference an already-defined visibilityExpression set within the ExpressionInfos
const fieldElement = new FieldElement({
  type: "field",
  fieldName: "inspemail",
  label: "Email address",
  visibilityExpression: "alwaysHidden"
});

Method Overview

Name Return Type Summary Class
*

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

more details
more detailsElement
Object

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

more details
more detailsElement

Method Details

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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