@angular/forms

CheckboxRequiredValidator

directive

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.

API

  
    class CheckboxRequiredValidator extends RequiredValidator {}

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 checkbox controls marked with the required attribute. The directive is provided with the NG_VALIDATORS multi-provider list.

Exported by

Usage Notes

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>