[fw-mvc] how to display validation errors explicitly

In my forms I don't want decorators to display my error messages in view, I want to display them by myself

 

in controller I have

 

        public function registerAction()

        {

            $form = new Zend_Form;

            $form->setAction('user/save')

                 ->setMethod('post');

               

            $user_name = $form->createElement('text','txt_username',array('class'=>'input'));

            $user_name->addValidator('alnum')

                      ->setRequired(true)

                      ->setDecorators(array('ViewHelper'))

                      ->addFilter('StringToLower');

 

            $form->submit->setDecorators(array('ViewHelper'));

            $this->view->form = $form;

            $this->_form = $form;

           

            $request = $this->getRequest();

            if($request->isPost())

            {

                if($form->isValid($request->getPost()))

                {

                   

                }

                else

                {

                                ## here I want to display errors of form ##

                     print_r($form->user_name->getErrors()); //return empty array

                     print_r($form->getErrorMessages()); //return empty array

              

                }

            }

           

        }

 

 

 

regards

 

Arslan Ali