validation and pass an id in url to view from controller

Hello
sorry for my bad english. i really need help 
i am creating a simple help desk and i have one question please answer me.

1: go to new ticket ( ex: localhost/helpdesk/index.php/ticket/show/10 ).

for number 1 i have a function ( public show ) and display all replies in id 10.

2: and show/10 has a form for reply your comment. ( screenshot : http://s6.uplod.ir/i/00880/op3jnntpy1lu.jpg )

then i need validation form when users submit new reply. i wrote validation rules, but i can't pass message error from controller to view (ticket/show/id).

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';
        }
    } 


PHP Code:

  public function reply()
    {
        $this->form_validation->set_rules('comment','Comment','required|trim');
        if($this->form_validation->run() == FALSE){
            $ticket_id = $this->input->post('ticket_id');
            //$show['show_ticket_comment'] = $this->ticket_model->get_reply($ticket_id);
           // $this->template->load('ticket/show/'.$ticket_id,array('errors' => validation_errors('','<br />')));
           // return;
            
            // what code needs here ??????

        }else{
            if($_FILES['userfile']){
                $this->load->library('upload', $config);
                //$this->upload->initialize($config);
                if($this->upload->do_upload('userfile')){
                    $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;
                    $upload_data = $this->upload->data();
                    $file_name = $upload_data['file_name'];

                    $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_name;
                    $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);
                    }
                }else{
          //          $error = array('error' => $this->upload->display_errors());
echo '11';
            //        $this->load->view('show_ticket', $error);
                }
            }else{print_r($_POST);}
        }
    } 


in Codeigniter best practice is to put form_validation in the same method. I mean you should merge your show() and reply() methods

PHP Code:

public function show($groups_id)
{
if($this->input->post()){ //check if user posted form

}
else{ //if nothing posted

}
} 


To show errors in view :

PHP Code:

<?php echo form_error('field name', '<div class="error">', '</div>'); ?>

Try this way, if this does not help, post your view code also.

please more explain. i have problem in reply function

PHP Code:

public function show($groups_id)
{
if($this->input->post()){ //check if user posted form
          $this->form_validation->set_rules('comment','Comment','required|trim');
        if($this->form_validation->run() == FALSE){
            $ticket_id = $this->input->post('ticket_id');
            $show['show_ticket_comment'] = $this->ticket_model->get_reply($ticket_id);
            $this->template->load('ticket/show/'.$ticket_id);
           // return;
            
            echo form_error('comment', '<div class="error">', '</div>'); // you gonna put this code in your view file

        }else{
            if($_FILES['userfile']){
                $this->load->library('upload', $config);
                //$this->upload->initialize($config);
                if($this->upload->do_upload('userfile')){
                    $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;
                    $upload_data = $this->upload->data();
                    $file_name = $upload_data['file_name'];

                    $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_name;
                    $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);
                    }
                }else{
          //          $error = array('error' => $this->upload->display_errors());
                echo '11';
            //        $this->load->view('show_ticket', $error);
                }
            }else{print_r($_POST);}
        }
}
else{ //if nothing posted
        $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';
        }
}
} 


could you have a look my view

PHP Code:

<section class="panel">
     <?php
     foreach ($show_ticket as $value){
     $id = $value['ticket_id'];
     $create_by = $value['username'];
     $create_by_id = $value['id'];
     $department = $value['name'];
     $subject = $value['subject'];
     $status = $value['active'];
     $create_date = $value['create_date'];
     $create_date = jdate('Y/m/j H:i',$create_date);
     $message = $value['message'];
     ?>
    <header class="panel-heading">
    مشاهده تیکت<?php echo '#' . $id; ?>
    </header>
    <?php echo $subject; ?>
    
    <table class="table table-striped table-advance table-hover">
    <thead>
         <tr>
             <th>ایجاد شده توسط</th>
             <th>واحد</th>
             <th>وضعیت</th>
             <th>تاریخ ایجاد</th>
         </tr>
    </thead>
         <tr>
             <td><?php echo $create_by; ?></td>
             <td><?php echo $department; ?></td>

             <td><?php if($status == 1){echo 'منتشر شده';}elseif($status == 0){echo 'منتشر نشده';} ?></td>
             <td><?php echo $create_date; ?></td>
         </tr>
         <?php } ?>
     </table>
     <div id="message_ticket_orginal"><?php echo $message; ?></div>
     <button type="button" id="btn-reply1" class="btn btn-primary">پاسخ دادن</button>
     
<div id="reply_ticket">     
         <?php echo validation_errors(); ?>
         <?php echo form_open_multipart('ticket/reply'); ?>
    <div class="form-group">
        <label class="control-label col-sm-2">شرح درخواست</label>
        <div class="col-sm-10">
            <textarea class="form-control editor1" name="comment" id="editor1" rows="6"></textarea>
        </div>
    </div>
    <div class="form-group">
        <label for="userfile">آپلود تصویر</label>
        <input type="file" name="userfile" size="20" />
        <small>فایل های مجاز: txt,doc,gif,png,jpeg,jpg</small>
    </div>
    <input type="submit" value="ایجاد" class="btn btn-round btn-info">
    <a href="<?php echo base_url(); ?>index.php/ticket/all" class="btn btn-round btn-default">بازگشت</a>
    <input type="hidden" value="<?php echo $id; ?>" name="ticket_id">
    </form>
</div>

     <div id="#reply_list">
         <?php
         foreach ($show_ticket_comment as $value_ticket_comment){
         $reply_id = $value_ticket_comment['ticket_id'];
         $reply_create_by = $value_ticket_comment['username'];
         $reply_comment = $value_ticket_comment['comment'];
         $reply_date = $value_ticket_comment['create_date'];
         $reply_date = jdate('Y/m/j H:i',$reply_date);
         $reply_file = $value_ticket_comment['file'];
         ?>

        <div id="reply_header">
            <div id="reply_date"><?php echo $reply_date; ?></div>
            <div id="reply_create"><?php echo $reply_create_by; ?></div>
        </div>
             <?php
             if($reply_create_by == $create_by) {
                 $color = 'reply_comment';
             }else{
                  $color='reply_comment_receive';
             }
          ?>
        <div id="<?php echo $color; ?>">
            <?php echo $reply_comment; ?>

            <?php
            if(!empty($reply_file)){
                echo '<br/><br/>';
               echo 'فایل های ضمیمه شده: ' . "<a target='_blank' href=".base_url()."file_ticket/$reply_file>" .$reply_file.  '</a>';
            }
            ?>
        </div>
         <?php } ?>
     </div>


<section>
 <script>
$(document).ready(function(){
    $('#reply_ticket').hide();
    $("#btn-reply1").click(function(){
        
        $("#reply_ticket").slideToggle('slow');
    });
});
</script>
<script>
     CKEDITOR.replace( 'comment' , {
         contentsLangDirection: 'rtl'
         config.removePlugins= 'toolbar'
     });
</script> 


if u used my posted code, there is no reply() method in my code, so you have to set your form action in to

PHP Code:

echo form_open_multipart('ticket/show' . $groupsId ); 
//pass $groupsId  from controller to view 


 
after fixing it, when u post form with empty inputs you should see form validation errors

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: id

Filename: controllers/ticket.php

Line Number: 115

Backtrace:

File: C:\wamp\www\ticket\application\controllers\ticket.php
Line: 115
Function: _error_handler

File: C:\wamp\www\ticket\index.php
Line: 315
Function: require_once