RequiredValidator

directive

npm Package	@angular/forms
Module	import { RequiredValidator } from '@angular/forms';
Source	forms/src/directives/validators.ts

Overview

@Directive({
    selector: ':not([type=checkbox])[required][formControlName],:not([type=checkbox])[required][formControl],:not([type=checkbox])[required][ngModel]',
    providers: [REQUIRED_VALIDATOR],
    host: { '[attr.required]': 'required ? "" : null' }
})
class RequiredValidator implements Validator {
  required: boolean | string
  validate(c: AbstractControl): ValidationErrors | null
  registerOnValidatorChange(fn: () => void): void
}

Selectors

:not([type=checkbox])[required][formControlName] :not([type=checkbox])[required][formControl] :not([type=checkbox])[required][ngModel]

Inputs

Description

A Directive that adds the required validator to any controls marked with the required attribute, via the NG_VALIDATORS binding.

Example

<input name="fullName" ngModel required>

Members

required: boolean | string

validate(c: AbstractControl): ValidationErrors | null

registerOnValidatorChange(fn: () => void): void