javascript - $error tracking with AngularJs when you don't have a form and field names -

basically have bunch of form fields (input, textarea, select, etc.). no <form> , no field names per say.

eg (extract dom notice classes when maxlength exceeded):

<textarea placeholder="enter name new task" data-ng-model="task.title" data-ng-maxlength="350" class="ng-touched ng-dirty ng-valid-parse ng-invalid ng-invalid-maxlength"></textarea> 

relatively straight forward in term of html. want use angular's ng-maxlength visually display error message.

i aware there $scope.{form_name}.{field_name}.$error since don't have either form , field names resulting in error.

$scope.$error - results in undefined.
$scope.form.error - resulted in error because of no <from>.
$scope.task_title.$error - result in error because of no <form>.

should stick jquery watching ng-invalid or ng-invalid-maxlength. or there still way track in controller?