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Showing content from https://developers.arcgis.com/javascript/latest/api-reference/esri-form-ExpressionInfo.html below:

ExpressionInfo | API Reference | ArcGIS Maps SDK for JavaScript 4.33

ESM: import ExpressionInfo from "@arcgis/core/form/ExpressionInfo.js";

CDN: const ExpressionInfo = await $arcgis.import("@arcgis/core/form/ExpressionInfo.js");

Class: @arcgis/core/form/ExpressionInfo

Since: ArcGIS Maps SDK for JavaScript 4.16

The ExpressionInfo class defines the makeup of visibility expressions, required expressions, editable expressions, and value expressions. Visibility expressions are available on field, group, and relationship elements. These elements are contained within a formTemplate set directly on either a FeatureForm or FeatureLayer.

All of the Arcade expressions referenced above, excluding value expressions, must follow the specification defined in the Form Constraint Profile. This profile may reference field values using the $feature variable and the expression must return true or false.

Value expressions must follow the specification defined in the Form Calculation Profile. It may reference field values within an individual $feature or in other layers and must return either a date, number, or string value. Once the expression evaluates, the form's field value updates to the expressions' result.

It is required to set the map property when instantiating a FeatureForm widget and using expressions that use the $map variable.

See also

• FormTemplate
• FieldElement.visibilityExpression
• GroupElement.visibilityExpression
• FieldElement.requiredExpression
• FieldElement.editableExpression
• FieldElement.valueExpression
• RelationshipElement.visibilityExpression

• Sample - Editor using calculated expressions

• Form Constraint Profile Specification

• Form Calculation Profile

ExpressionInfo Constructor new ExpressionInfo(properties)

Parameter

optional

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

Show inherited properties Hide inherited properties

declaredClass

Inherited

Property declaredClass Stringreadonly

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

expression Property expression String

Example

// Sets the visibility of a field in the form template only if the date is within the last 24 hours.
expressionInfo.expression = "IIF(DateDiff(Now(), $feature.incident_date, 'hours') < 24)";

returnType Property returnType String

Indicates the return type of the Arcade expression. In FeatureForm expressions, the returnType can be boolean, date, number or string. This is dependant upon the type of expression used. For example, visibility expressions, required expressions, and editable expressions only return a boolean, whereas value expressions return either date, number, or string.

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

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

Example

expressionInfo.title = "Did the incident occur within the last 24 hours?";

Show inherited methods Hide inherited methods

addHandles

Inherited

Method addHandles(handleOrHandles, groupKey)

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

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.

Creates a deep clone of the ExpressionInfo class.

Returns

Type Description ExpressionInfo A deep clone of the ExpressionInfo 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.

Returns

Type Description * | null | undefined Returns a new instance of this class.

hasHandles

Inherited

Method hasHandles(groupKey){Boolean}

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)

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");

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