codeigniter - Code igniter and jquery $.post() -

i using jquery $.post() , updating value in database using cod igniter. now, how send result success call in jquery.

this what, have tired.

model

 class test extends ci_model{     function update(){            .....         return $result = $this->db->update();       }     } 

jquery

 $.post(...,... , function(data,status) {         alert(data);  **says undefined**         alert(status); **says success**       }); 

since using update update value in database, passing array controller model.now when use mentioned in controller, missing argument 1 update() function makes sense, how result of model controller ?

just echo variable. received in jquery. try this,

controller :

function index(){   if($a = $this->test_model->update()){     $data['rows'] = $a;   }   echo json_encode($data);  }