DefaultValueAccessor
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.
constructor
DefaultValueAccessor
boolean
DefaultValueAccessor
Description
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.
Exported by
Usage Notes
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">
This value accessor is used by default for <input type="text">
and <textarea>
elements, but
you could also use it for custom components that have similar behavior and do not require special
processing. In order to attach the default value accessor to a custom element, add the
ngDefaultControl
attribute as shown below.
<custom-input-component ngDefaultControl [(ngModel)]="value"></custom-input-component>