validation file uploadin

Hello everybody
i am building a simple help system with codeigniter. and users can attachment files when response to a ticket.
But I do not know how to display error for users when uploading files has problem encountered in view tickets. please check my code. i really need your help

PHP Code:

public function show()
    {
        $show = array();
        $id = $this->uri->segment('3');
        $groups_id = $this->ticket_model->get_groups_id($id);
        $show['show_ticket'] = $this->ticket_model->show($id, $groups_id);

        foreach ($show['show_ticket'] as $show_value){
            $show_gorup_id = $show_value['department_id'];
            $create_by_id = $show_value['user_id'];
        }

        $show['show_ticket_comment'] = $this->ticket_model->get_reply($id);

        foreach ($this->aauth->get_user_groups() as $user_groups) {
            $user_groups_id = $user_groups->id;
        }

        if (($this->aauth->is_member('Admin')) ||($user_groups_id == $show_gorup_id) || ($create_by_id == $this->aauth->get_user_id())) {
            $this->template->load('ticket/show_ticket', $show);
        }else{
            echo 'Access Denied';
        }
    } 








public function reply()
    {
        $config['upload_path'] = './file_ticket';
        $config['allowed_types'] = 'gif|jpg|png|jpeg|pdf|doc|docx|txt';
        $config['max_size'] = 4000;
        $config['max_width'] = 11024;
        $config['max_height'] = 7168;
        $this->load->library('upload', $config);
        $this->upload->initialize($config);

       // if ( !$this->upload->do_upload('userfile')) {
         //   $error = array('error' => $this->upload->display_errors());
          //  $this->load->view('upload_form', $error);
           // return;
        //}

        $uploadData = $this->upload->data();
        $file = $uploadData['file_name'];


        $this->form_validation->set_rules('comment', 'Comment', 'required|trim');
        if ($this->form_validation->run() == FALSE) {
         //    $this->template->load('ticket/show_ticket',array('groups' => $ticket_add));
        //what code needs for display error here ?

        } else {
            $reply_ticket['ticket_comment_id'] = '';
            $reply_ticket['ticket_id'] = $this->input->post('ticket_id');
            $reply_ticket['user_id'] = $this->aauth->get_user_id();
            $reply_ticket['comment'] = $this->input->post('comment');
            $reply_ticket['create_date'] = now();
            $reply_ticket['file'] = $file;
            $insert_ticket_comment = $this->ticket_model->reply($reply_ticket);
            if ($insert_ticket_comment) {
                $show = array();
                $id = $this->input->post('ticket_id');
                $groups_id = $this->ticket_model->get_groups_id($id);
                $show['show_ticket'] = $this->ticket_model->show($id, $groups_id);

                redirect('ticket/show/'.$id);
            }
        }
    } 


It shows you exactly how to do this in the CodeIgniter Users Guide - File_upload.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

It shows you exactly how to do this in the CodeIgniter Users Guide - File_upload.

there is this line
$error = array('error' => $this->upload->display_errors());

 it doesn't work exactly for me. this is related to show function and i can't fix. please help me

I always include the error message in backend through session and redirect back to previous page or controller and check if there's an error in session and display that to user.

You can also do it through json response just an idea.

There are those who tell lies with meaning behind them and those meaning less lies!