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

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.

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">

Sets the "value" property on the input element.

      
      writeValue(value: any): void

value

any

The checked value

void

Registers a function called when the control value changes.

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

fn

(_: any) => void

The callback function

void

Registers a function called when the control is touched.

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

fn

() => void

The callback function

void

Sets the "disabled" property on the input element.

      
      setDisabledState(isDisabled: boolean): void

isDisabled

boolean

The disabled value

void