Database inlcude Groups like Arts,Science and IT.By Choosing one Group Second Dynamic Dropdown appear which will show the Subjects Related to Group. This is my View

   
   
 

    
Enter Courses
 

 
 session->flashdata('feedback')):
  $feedback_class = $this->session->flashdata('feedback_class');
  ?>
 

   

      ×
      

    
 
   
 

        

         'form-group']); ?>
            

  'rollno','class'=>'form-control','placeholder'=>'Enter Student ROll NO']); ?>
            

            
                Arts
                Science
                IT
            

            

            
            

            'form-control btn btn-         success','value'=>'Submit']) ?>
        
    
 
 

And This is Controller

   load->helper('form');
    $this->load->view('admin/course');
}
public function getsubject($grp)
{
        $this->load->model('courses');
$grp = $this->courses->getsubjects($grp);
  }}
     ?>

I didnt know how to do this in Codeigniter,Got helped from google like Ajax trickds but nothing