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docs(aio): Add null type to form validation example (#23949) 

Closes #20282

PR Close #23949
This commit is contained in:
Brandon Roberts 2018-05-16 15:47:13 -05:00 committed by Victor Berchet
parent 20c463e97c
commit 87b16710e7
1 changed files with 2 additions and 2 deletions
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4
aio/content/examples/form-validation/src/app/shared/forbidden-name.directive.ts
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@ -5,7 +5,7 @@ import { AbstractControl, NG_VALIDATORS, Validator, ValidatorFn, Validators } fr
// #docregion custom-validator
/** A hero's name can't match the given regular expression */
export function forbiddenNameValidator(nameRe: RegExp): ValidatorFn {
return (control: AbstractControl): {[key: string]: any} => {
return (control: AbstractControl): {[key: string]: any} | null => {
const forbidden = nameRe.test(control.value);
return forbidden ? {'forbiddenName': {value: control.value}} : null;
};
@ -22,7 +22,7 @@ export function forbiddenNameValidator(nameRe: RegExp): ValidatorFn {
export class ForbiddenValidatorDirective implements Validator {
@Input('appForbiddenName') forbiddenName: string;
validate(control: AbstractControl): {[key: string]: any} {
validate(control: AbstractControl): {[key: string]: any} | null {
return this.forbiddenName ? forbiddenNameValidator(new RegExp(this.forbiddenName, 'i'))(control)
: null;
}