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RadioControlValueAccessor

directive

The ControlValueAccessor for writing radio control values and listening to radio control changes. The value accessor is used by the FormControlDirective, FormControlName, and NgModel directives.

NgModules

Selectors

Properties

Property Description
@Input()name: string

Tracks the name of the radio input element.

@Input()formControlName: string

Tracks the name of the FormControl bound to the directive. The name corresponds to a key in the parent FormGroup or FormArray.

@Input()value: any

Tracks the value of the radio input element

Description

Using radio buttons with reactive form directives

The follow example shows how to use radio buttons in a reactive form. When using radio buttons in a reactive form, radio buttons in the same group should have the same formControlName. Providing a name attribute is optional.

import {Component} from '@angular/core';
import {FormControl, FormGroup} from '@angular/forms';

@Component({
  selector: 'example-app',
  template: `
    <form [formGroup]="form">
      <input type="radio" formControlName="food" value="beef" > Beef
      <input type="radio" formControlName="food" value="lamb"> Lamb
      <input type="radio" formControlName="food" value="fish"> Fish
    </form>

    <p>Form value: {{ form.value | json }}</p>  <!-- {food: 'lamb' } -->
  `,
})
export class ReactiveRadioButtonComp {
  form = new FormGroup({
    food: new FormControl('lamb'),
  });
}

Methods

Sets the "value" on the radio input element and unchecks it.

fireUncheck(value: any): void

Parameters
value any
Returns

void

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