class Login extends MY_Controller {
        public function __construct(){
            parent::__construct();
        }

        public function index(){
            $data['module'] = 'Login';
            $this->load->view('login',$data);
        }

        public function getAccess(){
            if ($this->session->userdata('logged_in') == TRUE){
                redirect('home');
            }else{
                $username = $this->security->xss_clean($this->input->post('username'));
                $password = $this->security->xss_clean($this->input->post('password'));
                $array = $this->user->login($username,$password);
                if ($array[0] == 0) {
                    $this->json(array('error' => 'invalid username or password'));
                }else{
                    $data_session = array(
                        'id' => $array[0]['id'],
                        'name' => $array[0]['nombre'],
                        'last_name' => $array[0]['apellido'],
                        'type' => $array[0]['id_perfil'],
                        'logged_in' => TRUE
                    );
                    $this->session->set_userdata('log',$data_session);
                }
            }
        }

        public function logout(){
            $this->session->sess_destroy();
            redirect('login');
        }

    }

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class MY_Controller extends CI_Controller {

    function __construct(){
        parent::__construct();
    }

    protected function isLogged(){
        if(!$this->session->userdata('log'))
            redirect('login');
    }

    protected function json($array){
        $this->output->set_content_type('application/json')->set_output(json_encode($array));
    }

    protected function getModules(){
        if($this->session->userdata('log')){
            $data = $this->session->userdata('log');
            $menu = array();
            $seccions = $this->module->get_rows();
            foreach ($seccions as $index => $seccion){
               $modules = $this->module->query("SELECT CONCAT('".$seccion['id']."',storelte_modulo.id) AS id,CONCAT('".base_url('assets/img/sidebar')."','/',storelte_modulo.icon) as icon, storelte_modulo.modulo AS value,storelte_modulo.seccion_id,CONCAT('".base_url()."',storelte_modulo.url) AS  url FROM storelte_modulo INNER JOIN storelte_modulo_perfil ON  storelte_modulo_perfil.modulo_id = storelte_modulo.id WHERE seccion_id = $seccion[id] AND storelte_modulo_perfil.perfiles_id = $data[id] AND storelte_modulo_perfil.STATUS = 1");
                $seccions[$index]['data']= $modules;
                if (!count($seccions[$index]['data']))
                    unset($seccions[$index]);
            }
            foreach ($seccions as $item)
                array_push($menu,$item);
            return $menu;
        }
    }
}

BASE_URL =  "<?= base_url() ?>";
     $('#login-form').submit(function(){
        var username = $('#username').val();
        var password = $('#password').val();
        URL_GET_ACCESS = BASE_URL+"login/getAccess";
        $.ajax({
            url: URL_GET_ACCESS,
            type: 'POST',
            data: {username: username, password: password}
        }).done(function(data){
            console.log(data);
            if (data.error === 'invalid username or password') {
                $('#error').show().delay(2000).fadeOut();
                $('#username,#password').val('');
            }else if(data === '1'){
                window.location.href=BASE_URL+'home';
            }else{
                 window.location.href=BASE_URL+'home';
            }
        });
        return false;
     });