how to use Ajax with CodeIgniter in a combo box

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your controller :

Code:

function get_cities(){
$cities = $model->get_cities();
echo json_encode(array('status'=>'1','cities'=>$cities));
}

your js (jQuery) function:

Code:

function get_cities(){
$.post(your_controller_url,{postdata:postdata},function(data){
   if(data.status==1){
     // print your view here
   }
},'json');
};