error handling

<div *ngIf="name.invalid" style="color: red;">
          <div [hidden]="name.valid || name.pristine" class="alert alert-danger">
              <div *ngIf="name.errors.required">
                Name Required
              </div>
              <div *ngIf="name.errors.minlength">
                Listen, a name with less than 3 character is NOT a name
              </div>
              <div *ngIf="name.errors.forbiddenName">
                "Mr Badman" is banished by order from our prof!
              </div>
        </div>
      </div>