require(["esri/form/elements/FieldElement"], (FieldElement) => { /* code goes here */ });
import FieldElement from "@arcgis/core/form/elements/FieldElement.js";
esri/form/elements/FieldElement
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
.
- See also
// 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
-
Parameterproperties Objectoptional
See the properties for a list of all the properties that may be passed into the constructor.
Property Overview
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
-
domain
domain CodedValueDomain |RangeDomainautocast
-
The coded value domain or range domain of the field.
-
editableExpression
editableExpression String
Since: ArcGIS Maps SDK for JavaScript 4.23FieldElement 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 iffalse
. 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 eithertrue
orfalse
. - 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.
- The expression must follow the specification
defined in the Form Constraint Profile. Expressions
may reference field values using the
-
fieldName
fieldName String
-
The field name as defined by the feature layer. Set this property to indicate which field to edit.
-
hint
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.
-
requiredExpression
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 tofalse
, 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 eithertrue
orfalse
. - It is required to set the map property when instantiating a FeatureForm widget and using expressions that make use of the
$map
variable. - The referenced expression must be defined in the form template's expressionInfos. It cannot be set inline to this property.
- Field and Group elements must be visible if the field or one of the grouped fields is required.
- See also
Examples// The diameter field requires a value to be created or edited // if the inspectionStatus value is "Complete" // if the status is not complete, then this field value is optional const dbhFieldElement = new FieldElement({ fieldName: "diameter", input: { type: "text-box" }, requiredExpression: "tree-dbh", editableExpression: "editable" }); layer.formTemplate = new FormTemplate({ elements: [ dbhFieldElement ], expressionInfos: [{ expression: "$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" }] });
- The expression must follow the specification
defined in the Form Constraint Profile. Expressions
may reference field values using the
-
type
type Stringreadonly
-
Indicates the type of form element.
For FieldElement the type is always "field".
-
valueExpression
valueExpression String
Since: ArcGIS Maps SDK for JavaScript 4.23FieldElement 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
InheritedPropertyvisibilityExpression 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 tofalse
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
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
-
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.25Accessor 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();
ParametershandleOrHandles WatchHandle|WatchHandle[]Handles marked for removal once the object is destroyed.
groupKey *optionalKey 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
clone(){FieldElement}
-
Creates a deep clone of the FieldElement class.
ReturnsType Description FieldElement A deep clone of the FieldElement 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.Parameterjson ObjectA 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.
ReturnsType Description * Returns a new instance of this class.
-
hasHandles
InheritedMethodhasHandles(groupKey){Boolean}
Inherited from AccessorSince: ArcGIS Maps SDK for JavaScript 4.25Accessor since 4.0, hasHandles added at 4.25. -
Returns true if a named group of handles exist.
ParametergroupKey *optionalA group key.
ReturnsType 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"); }
-
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.25Accessor since 4.0, removeHandles added at 4.25. -
Removes a group of handles owned by the object.
ParametergroupKey *optionalA group key or an array or collection of group keys to remove.
Exampleobj.removeHandles(); // removes handles from default group obj.removeHandles("handle-group"); obj.removeHandles("other-handle-group");
-
toJSON
InheritedMethodtoJSON(){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.
ReturnsType Description Object The ArcGIS portal JSON representation of an instance of this class.