how to use Ajax with CodeIgniter in a combo box

Code:

// in my view page a combo box where the local city name is present.

    <select name="city" id="city" class="textBoxStyle" style="width:100">

            <option value="">Select One</option>

            <option value="all">All</option>

                &lt;?php

                  foreach ($package_name as $destination){?&gt;

                    <option value="&lt;?php echo $destination['id'];?&gt;">&lt;?php echo $destination['city_name'];?&gt;

            </option>

                &lt;?php } ?&gt;

       </select>

 

// and a radio button that is 

    &lt;input name="holiday_type" type="radio" value="2"/&gt;International Holiday

// when the user will click on the radio button the combo box will show the international 

//city_name from the database using ajax..



// i dnt know how to execute ajax with codeigniter but i can do it using raw php.

Code:

function get_cities(){

$cities = $model->get_cities();

echo json_encode(array('status'=>'1','cities'=>$cities));

}

Code:

function get_cities(){

$.post(your_controller_url,{postdata:postdata},function(data){

   if(data.status==1){

     // print your view here

   }

},'json');

};