MYDOUBTS.in

	

$active_group = 'default';
$active_record = TRUE;

$db['default']['hostname'] = 'localhost';
$db['default']['username'] = 'root';
$db['default']['password'] = '';
$db['default']['database'] = 'testlogin';
$db['default']['dbdriver'] = 'mysql';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;

step2:create a table inside testlogin database and insert the values please see the query below.

CREATE TABLE IF NOT EXISTS `country_state` (
  `country` varchar(250) NOT NULL,
  `state` varchar(250) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `country_state`
--

INSERT INTO `country_state` (`country`, `state`) VALUES
('india', 'kerala'),
('india', 'karnataka'),
('USA', 'Texas'),
('USA', 'Newyork'),
('UAE', 'Abhudhabi'),
('UAE', 'Dubai');

step3:Create a model file inside application/model/countrystate.php

class Countrystate extends CI_Model {
  
    function loadcountries() {
        $query = $this->db->query("SELECT DISTINCT country FROM country_state");
         
        if ($query->num_rows > 0) {
            return $query->result();
        }
    }
     
    function loadstatesfromcountries($country) {
	
        $query = $this->db->query("SELECT state FROM country_state WHERE country = '{$country}'");
	
         
        if ($query->num_rows > 0) {
            return $query->result();
        }
    }
}

step4: create controllers inside the controllers folder-application/controllers/countrystate_disp.php

class Countrystate_disp extends CI_Controller {
     
        function __construct() {
        parent::__construct();
        $this->load->model('countrystate','',TRUE);

    }
     
    
    function index() {
       
        $arrCountries = $this->countrystate->loadcountries();
              
        foreach ($arrCountries as $countries) {
            $arrcountries[$countries->country] = $countries->country;
        }
         
        $data['country'] = $arrcountries;
         
       
        $this->load->view('loadcountrystate',$data);
    }
     
    function ajax_call() {
       
        if (isset($_POST) && isset($_POST['country'])) {
            $country = $_POST['country'];
			           $arrStates = $this->countrystate->loadstatesfromcountries($country);
                     foreach ($arrStates as $states) {
                $arrstates[$states->state] = $states->state;
            }
             
       
            print form_dropdown('state',$arrstates);
        } else {
            redirect('site');
        }
  	
	}
}