--------/controllers/home.php-----------------
    function processListRates(){
        $this->load->helper('url');
        $this->load->database();
            $this->load->model('Eazyteldb');//load model

        $sql = "SELECT  * FROM eazytel_web_rate WHERE destination
                        LIKE'''%".$this->input->post("textInserted")."')";
        $this->db->query($sql);
    }


---------/views/home.php------------------------

$(document).ready(function(){


    //SEND DATA
       jQuery('#countryrate').keypress(function(){
           $.post("home/processListRates","textInserted="+jQuery('#countryrate').val(),processResponse);
    });//end keypress



       //RECEIVE DATA
       function processResponse(data){
                    .......

     };






});//END ready