RequiredValidator

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

NgModules

• FormsModule

• ReactiveFormsModule

Selectors

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

Properties

Property	Description
@Input()required: boolean | string

Description

Example

<input name="fullName" ngModel required>

Methods

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

registerOnValidatorChange()
registerOnValidatorChange(fn: () => void): void Parameters fn Type: () => void. Returns void