CheckboxRequiredValidator

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.

See also

• Form Validation

NgModules

• ../formsmodule

  FormsModule

• ../reactiveformsmodule

  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()
Method that validates whether or not the checkbox has been checked. Returns the validation result if enabled, otherwise null.
validate(control: AbstractControl): ValidationErrors | null Parameters control AbstractControl Returns ValidationErrors | null

Inherited from RequiredValidator

• validate(control: AbstractControl): ValidationErrors | null
• registerOnValidatorChange(fn: () => void): void

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Licensed under the Creative Commons Attribution License 4.0.
https://v7.angular.io/api/forms/CheckboxRequiredValidator