codeigniter - AJAX Form Validation to see if course already exist always return true -

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i want validate course name field if course name inputted exist using ajax, ajax function return alert('already exist') if inputted data not yet in database. please help. here code. thanks.

view:

<script type="text/javascript"> var typingtimer; var donetypinginterval = 3000;   $('#course_name').keyup(function(){ typingtimer = settimeout(check_course_name_exist, donetypinginterval); });   $('#course_name').keydown(function(){ cleartimeout(typingtimer); });    function check_course_name_exist()    {     var course_name=$("#course_name").val();      var postdata= {     'course_name':course_name    };       $.ajax({         type: "post",         url: "<?php echo base_url();?>/courses/check_course_name_existence",         data: postdata,         success: function(msg)         {           if(msg == 0)         {          alert('already exist!');          return false;         }          else          {          alert('available');          return false;          }            return false;         }     });     $("html, body").animate({ scrolltop: 0 }, 600);   return false;    }      </script>

controller:

function check_course_name_existence() {  $course_name = $this->input->post('course_name');   $result = $this->course_booking_model->check_course_name_exist($course_name);  if ($result)  {   return true;  }  else  {   return false;  } }

model:

function check_course_name_exist($course_name) {      $this->db->where("course_name",$course_name);     $query=$this->db->get("courses");     if($query->num_rows()>0)     {         return true;     }     else     {         return false;     } }

you use console.log() function firebug. way know ajax returns. example:

success: function(msg) {     console.log(msg); }

this way know type of result variable.


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