• Overview
@angular/forms

RequiredValidator

directive

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

API

  
    class RequiredValidator extends AbstractValidatorDirective {}

required

string | boolean

Tracks changes to the required attribute bound to this directive.

enabled

boolean
@paraminputboolean
@returnsboolean

ngOnChanges

void
@paramchangesSimpleChanges
@returnsvoid

validate

ValidationErrors | null
@paramcontrolAbstractControl<any, any>
@returnsValidationErrors | null

registerOnValidatorChange

void
@paramfn() => void
@returnsvoid

Description

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

Exported by

Usage Notes

Adding a required validator using template-driven forms

          
<input name="fullName" ngModel required>
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