jquery - AJAX form submit Codeigniter -

i'm trying submit form using ajax / jquery view code igniter model. if post value has been passed model returns true.

my view showing success message regardless. please point out i'm going wrong?

here function controller:

function bookings(){             $this->load->helper('url');             if($_post):                  echo $_post["name"];              // database stuff here save comment.              // return false if db failed              // else              return true;          endif; } 

here relevant javascript & form view:

<div id="booking-form-container" class="fb-dialogue">             <div id="info">entery details below make group booking:</div>              <!-- hold response / error message server -->             <div id="response"></div>              <form id="bookingsform" method="post" action="eventguide/bookings">                  <label class="description" for="element_1">full name: </label>                 <div>                     <input id="name" name="name" class="element text medium" type="text" maxlength="255" value="<?php echo $me['first_name'] . ' ' . $me['last_name']; ?>"/>                  </div>                   <label class="description" for="element_2">email: </label>                  <div>                     <input id="element_2" name="element_2" class="element text medium" type="text" maxlength="255" value="<?php echo $me['email']; ?>"/>                  </div>                   <label class="description" for="element_3">mobile number: </label>                 <div>                     <input id="element_3" name="element_3" class="element text medium" type="text" maxlength="255" value=""/>                  </div>                   <label class="description" for="element_5">choose you're event: </label>                 <div>                     <select class="element select medium" id="element_5" name="element_5">                          <option value="" selected="selected"></option>                         <option value="1" >first option</option>                         <option value="2" >second option</option>                         <option value="3" >third option</option>                      </select>                 </div>                   <label class="description" for="element_4">group size: </label>                 <div>                     <input id="element_2" name="element_4" class="element text medium" type="number"  value="10"/>                  </div>                   <label class="description" for="element_6">questions or special requirements? </label>                 <div>                     <textarea id="element_6" name="element_6" class="element textarea medium"></textarea>                  </div>               </form>         </div>          <script type="text/javascript">              var mydetails = $("#booking-form-container").dialog({autoopen: false, modal: true, draggable: true, resizable: false, bgiframe: true, width: '400px', zindex: 9999, position: ['50%', 100]});              function showdetailsdialog() {                  $("#booking-form-container").dialog("option", "title", "group bookings");                   $("#booking-form-container").dialog({buttons: {                         "close": {text: 'close', priority: 'secondary', class: 'btn', click: function() {                                 $(this).dialog("close");                             }},                         "confirm booking": {text: 'confirm booking', priority: 'primary', class: 'btn btn-primary', click: function() {                                 $('#bookingsform').submit();                             }}                     }                 });                 $("#booking-form-container").dialog("open");              }              $("#bookingsform").submit(function(event) {                 event.preventdefault();                   datastring = $("#bookingsform").serialize();                       $.ajax({                        type: "post",                        url: "<?php echo base_url(); ?>eventguide/bookings",                        data: datastring,                         success: function(data){                            alert('successful!');                        }                       });                       return false;  //stop actual form post !important!             });          </script>   

what want first check see have data

if(isset($_post) && isset($_post['name'])) {    // post in $_post array, stuff    echo htmlspecialchars($_post['name'], ent_quotes, 'utf-8'); }