A Directive that adds the required validator to checkbox controls marked with the required attribute. The directive is provided with the NG_VALIDATORS multi-provider list.

See also

• Form Validation

Exported from

• FormsModule

• ReactiveFormsModule

Selectors

• input[type=checkbox][required][formControlName]
• input[type=checkbox][required][formControl]
• input[type=checkbox][required][ngModel]

Inherited from RequiredValidator

• @Input()required: boolean | string

Description

Adding a required checkbox validator using template-driven forms

The following example shows how to add a checkbox required validator to an input attached to an ngModel binding.

<input type="checkbox" name="active" ngModel required>

Methods

validate()
validate(control: AbstractControl): ValidationErrors | null Parameters control AbstractControl Returns ValidationErrors | null