FieldElement

AMD: require(["esri/form/elements/FieldElement"], (FieldElement) => { /* code goes here */ });
ESM: import FieldElement from "@arcgis/core/form/elements/FieldElement.js";
Class: esri/form/elements/FieldElement
Inheritance: FieldElement Element Accessor
Since: ArcGIS Maps SDK for JavaScript 4.16

A FieldElement form element defines how a feature layer's field participates in the FeatureForm. Use this approach to set field configurations within a feature form or feature layer formTemplate.

form template field elements

See also
Example
// Create the field element
const fieldElement1 = new FieldElement({
  fieldName: "inspector",
  label: "Inspector name"
});

const fieldElement2 = new FieldElement({
  fieldName: "inspdate",
  label: "Inspection date",
  description: "Date inspection was handled",
  input: { // autocastable to DatePickerInput
    type: "date-picker",
      min: "2010-01-15",
      max: "2030-01-15"
    }
});

const fieldElement3 = new FieldElement({
  fieldName: "placename",
  label: "Business name",
  editableExpression: "editing-disabled"
});

const fieldElement4 = new FieldElement({
  fieldName: "floodinsur",
  label: "Flood insurance",
  input: { // autocastable to RadioButtonsInput
    type: "radio-buttons",
    noValueOptionLabel: "Not applicable",
    showNoValueOption: true
  }
});

// Next pass in any elements to the FormTemplate
const formTemplate = new FormTemplate({
  title: "Inspector report",
  description: "Enter all relevant information below",
  expressionInfos: [{
    name: "editing-disabled",
    expression: "false",
    returnType: "boolean"
  }],
  elements: [fieldElement1, fieldElement2, fieldElement3, fieldElement4] // Add all elements to the template
});

Constructors

FieldElement

Constructor
new FieldElement(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

The name of the class.

Accessor

The element's description providing the purpose behind it.

Element

The coded value domain or range domain of the field.

FieldElement

A reference to the name of an Arcade expression defined in the expressionInfos of the FormTemplate.

FieldElement

The field name as defined by the feature layer.

FieldElement

Contains a hint used to help editors while editing fields.

FieldElement

The esri/form/elements/inputs/Input to use for the element.

FieldElement

A string value containing the field alias.

Element

A reference to the name of an Arcade expression defined in the expressionInfos of the FormTemplate.

FieldElement

Indicates the type of form element.

FieldElement

A reference to the name of an Arcade expression defined in the expressionInfos of the FormTemplate.

FieldElement

A reference to the name of an Arcade expression defined in the expressionInfos of the FormTemplate.

Element

Property Details

declaredClass

Inherited
Property
declaredClass Stringreadonly
Inherited from Accessor

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

description

Inherited
Property
description String
Inherited from Element

The element's description providing the purpose behind it.

domain

Property
domain CodedValueDomain |RangeDomainautocast

The coded value domain or range domain of the field.

editableExpression

Property
editableExpression String
Since: ArcGIS Maps SDK for JavaScript 4.23 FieldElement since 4.16, editableExpression added at 4.23.

A reference to the name of an Arcade expression defined in the expressionInfos of the FormTemplate.

When this expression evaluates to true, it is possible to edit the field value, and vice-versa if false. If the referenced field on the feature service is not editable, the editable expression is ignored and the element is not editable.

  • The expression must follow the specification defined in the Form Constraint Profile. Expressions may reference field values using the $feature global input and must return either true or false.
  • It is required to set the map property when instantiating a FeatureForm widget and using expressions that make use of the $map variable.
  • Editing must be disabled if setting a field element's valueExpression. The referenced expression must be defined in the form template's expressionInfos. It cannot be set inline within the element object.

fieldName

Property
fieldName String

The field name as defined by the feature layer. Set this property to indicate which field to edit.

hint

Property
hint String

Contains a hint used to help editors while editing fields. Set this as a temporary placeholder for text/number inputs in either TextAreaInput or TextBoxInput.

The esri/form/elements/inputs/Input to use for the element. The client application is responsible for defining the default user interface.

label

Inherited
Property
label String
Inherited from Element

A string value containing the field alias. This should not be used for referencing fields in Arcade expressions. Rather, the service fieldName should be referenced.

requiredExpression

Property
requiredExpression String

A reference to the name of an Arcade expression defined in the expressionInfos of the FormTemplate. An expression that evaluates to true results in the field element requiring the end user to provide a value for fieldName for the feature to be created or edited. If the expression evaluates to false, the end user is not required to provide a value to the element.

If the referenced fieldName is non-nullable, the requiredExpression is ignored and the element is always required.

  • The expression must follow the specification defined in the Form Constraint Profile. Expressions may reference field values using the $feature global input and must return either true or false.
  • It is required to set the map property when instantiating a FeatureForm widget and using expressions that make use of the $map variable.
  • The referenced expression must be defined in the form template's expressionInfos. It cannot be set inline to this property.
  • Field and Group elements must be visible if the field or one of the grouped fields is required.
Examples
// The diameter field requires a value to be created or edited
// if the inspectionStatus value is "Complete"
// if the status is not complete, then this field value is optional
const dbhFieldElement = new FieldElement({
  fieldName: "diameter",
  input: {
    type: "text-box"
  },
  requiredExpression: "tree-dbh",
  editableExpression: "editable"
});

layer.formTemplate = new FormTemplate({
  elements: [ dbhFieldElement ],
  expressionInfos: [{
    expression: "$feature.inspectionStatus == 'Complete'",
    name: "tree-dbh",
    title: "Tree DBH",
    returnType: "boolean"
  }, {
    expression: "true",
    name: "editable",
    returnType: "boolean"
  }]
});
// The field value will ALWAYS be required when editing with a form
const dbhFieldElement = new FieldElement({
  editable: true,
  fieldName: "diameter",
  input: {
    type: "text-box"
  },
  requiredExpression: "always-required",
  editableExpression: "editable"
});

layer.formTemplate = new FormTemplate({
  elements: [ dbhFieldElement ],
  expressionInfos: [{
    // An expression that always returns true
    expression: "true",
    name: "always-required",
    returnType: "boolean"
  }, {
    expression: "true",
    name: "editable",
    returnType: "boolean"
  }]
});

type

Property
type Stringreadonly

Indicates the type of form element.

For FieldElement the type is always "field".

valueExpression

Property
valueExpression String
Since: ArcGIS Maps SDK for JavaScript 4.23 FieldElement since 4.16, valueExpression added at 4.23.

A reference to the name of an Arcade expression defined in the expressionInfos of the FormTemplate.

Once the expression evaluates, the form's field value updates to the expression's result.

  • The expression must follow the specification defined in the Form Calculation Profile. This expression references field values within an individual feature or in other layers and must return either a date, number, or string value.
  • Editing must be disabled, which may be done via the editableExpression.
  • The referenced expression must be defined in the form template's expressionInfos. It cannot be set inline within the element object.
Example
// Calculates the diameter based on the circumference field
const dbhFieldElement = new FieldElement({
  fieldName: "diameter",
  input: {
    type: "text-box"
  },
  valueExpression: "tree-dbh",
  // element must not be editable to enable valueExpression
  editableExpression: "not-editable"
});

layer.formTemplate = new FormTemplate({
  elements: [ dbhFieldElement ],
  expressionInfos: [{
    expression: "Round(DefaultValue($feature.circumference, 0) / PI, 1)",
    name: "tree-dbh",
    title: "Tree DBH",
    returnType: "boolean"
  }, {
    expression: "false",
    name: "not-editable",
    returnType: "boolean"
  }]
});

visibilityExpression

Inherited
Property
visibilityExpression String
Inherited from Element

A reference to the name of an Arcade expression defined in the expressionInfos of the FormTemplate.

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 element is always displayed. Care must be taken when defining a visibility expression for a non-nullable field as to make certain the specified field has either 1) a default value, or 2) is made visible to the end user to enter a value before submitting the form.

  • The expression must follow the specification defined in the Form Calculation Profile. This expression references field values within an individual feature or in other layers and must return either a date, number, or string value.
  • The referenced expression must be defined in the form template's expressionInfos. It cannot be set inline within the element object.
  • Field and Group elements must be visible if the field or one of the grouped fields is required.
Example
// Expression created within ExpressionInfos and is referenced in element
const expression = new ExpressionInfo({
  name: "alwaysHidden",
  expression: "false"
});

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

formTemplate.expressionInfos = [ expression ];
formTemplate.elements = [ fieldElement ];

Method Overview

Show inherited methods Hide inherited methods
Name Return Type Summary Class

Adds one or more handles which are to be tied to the lifecycle of the object.

Accessor

Creates a deep clone of the FieldElement class.

FieldElement
*

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

Element

Returns true if a named group of handles exist.

Accessor

Removes a group of handles owned by the object.

Accessor

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

Element

Method Details

addHandles

Inherited
Method
addHandles(handleOrHandles, groupKey)
Inherited from Accessor
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
handleOrHandles WatchHandle|WatchHandle[]

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.

clone

Method
clone(){FieldElement}

Creates a deep clone of the FieldElement class.

Returns
Type Description
FieldElement A deep clone of the FieldElement instance.

fromJSON

Inherited
Method
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.

hasHandles

Inherited
Method
hasHandles(groupKey){Boolean}
Inherited from Accessor
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)
Inherited from Accessor
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");

toJSON

Inherited
Method
toJSON(){Object}
Inherited from Element

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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