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/Angular 7

DefaultValueAccessor

directive

The default ControlValueAccessor for writing a value and listening to changes on input elements. The accessor is used by the FormControlDirective, FormControlName, and NgModel directives.

NgModules

Selectors

Properties

Property Description
onChange: (_: any) => { }

The registered callback function called when an input event occurs on the input element.

onTouched: () => { }

The registered callback function called when a blur event occurs on the input element.

Description

Using the default value accessor

The following example shows how to use an input element that activates the default value accessor (in this case, a text field).

const firstNameControl = new FormControl();
<input type="text" [formControl]="firstNameControl">

Methods

Sets the "value" property on the input element.

writeValue(value: any): void

Parameters
value any

The checked value

Returns

void

Registers a function called when the control value changes.

registerOnChange(fn: (_: any) => void): void

Parameters
fn (_: any) => void

The callback function

Returns

void

Registers a function called when the control is touched.

registerOnTouched(fn: () => void): void

Parameters
fn () => void

The callback function

Returns

void

Sets the "disabled" property on the input element.

setDisabledState(isDisabled: boolean): void

Parameters
isDisabled boolean

The disabled value

Returns

void

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Licensed under the Creative Commons Attribution License 4.0.
https://v7.angular.io/api/forms/DefaultValueAccessor