Untitled

Controller login.php
<?php
 class Login extends CI_Controller{

    function __construct(){
        parent::__construct();
        $this->load->model('data_login');

    }

    function index(){
        $this->load->view('v_login');
    }

    function cek_login(){
        $username = $this->input->post('username');
        $password = $this->input->post('password');
        $where = array(
            'username' => $username,
            'password' => md5($password)
            );
        $cek = $this->data_login->cek_login("admin",$where)->num_rows();
        if($cek > 0){

            $data_session = array(
                'nama' => $username,
                'status' => "login"
                );

            $this->session->set_userdata($data_session);

            redirect('admin','refresh');

        }else{
            echo "<script type='text/javascript'>
            alert ('Username dan password salah !');
            </script>";
        }
    }

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


Models data_login.php
<?php
class Data_login extends CI_Model{
    function cek_login($table,$where){
        return $this->db->get_where($table,$where);
    }
    }
?>


View v_login.php

<!DOCTYPE html>
<html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Aplikasi Surat</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta charset="utf-8">
    <style type="text/css">
    @font-face {
      font-family: 'Cabin';
      font-style: normal;
      font-weight: 400;
      src: local('Cabin Regular'), local('Cabin-Regular'), url(aset/font/satu.woff) format('woff');
    }
    @font-face {
      font-family: 'Cabin';
      font-style: normal;
      font-weight: 700;
      src: local('Cabin Bold'), local('Cabin-Bold'), url(aset/font/dua.woff) format('woff');
    }
    @font-face {
      font-family: 'Lobster';
      font-style: normal;
      font-weight: 400;
      src: local('Lobster'), url(aset/font/tiga.woff) format('woff');
    }

    </style>
    <link rel="stylesheet" href="aset/css/bootstrap.css" media="screen">
    <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!--[if lt IE 9]>
      <script src="../bower_components/bootstrap/assets/js/html5shiv.js"></script>
      <script src="../bower_components/bootstrap/assets/js/respond.min.js"></script>
    <![endif]-->


    <script src="<?php echo base_url(); ?>aset/js/jquery.min.js"></script>
    <script src="<?php echo base_url(); ?>aset/js/bootstrap.min.js"></script>
    <script src="<?php echo base_url(); ?>aset/js/bootswatch.js"></script>
    <script src="<?php echo base_url(); ?>aset/js/jquery.chained.js"></script>
  <body style="">
    <div class="navbar navbar-inverse navbar-fixed-top">
      <div class="container">
        <div class="navbar-header">
          <span class="navbar-brand"><strong style="font-family: verdana; margin-left: 380px; text-align: left"></strong></span>
          <button class="navbar-toggle" type="button" data-toggle="collapse" data-target="#navbar-main">
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
        </div>

      </div>
    </div>


    <div class="container">

    <br><br>

    <div class="container-fluid" style="margin-top: 30px">

      <div class="row-fluid">
        <div style="width: 400px; margin: 0 auto">
            <div class="well well-sm">
                <img src="aset/img/logo.png" class="thumbnail span3" style="display: inline; float: left; margin-right: 20px; width: 80px; height: 80px">
                <h3 style="margin: 5px 0 0.4em 0; font-size: 21px; color: #000; font-weight: bold">PTPN IX SEMARANG</h3>
                <div style="color: #000; font-size: 13px" class="clearfix">Jl. Mugas Dalam Atas</div>
             </div>
        </div>

        <div class="well" style="width: 400px; margin: 20px auto; border: solid 1px #d9d9d9; padding: 30px 20px; border-radius: 8px">
        <form action="<?php echo base_url('login/cek_login'); ?>" method="post">
        <legend>Login Admin</legend>
        <table align="center" style="margin-bottom: 0" class="table-form" width="90%">
            <tr><td width="40%">Username</td><td><input type="text" autofocus name="u" required style="width: 200px" autofocus class="form-control"></td></tr>
            <tr><td>Password</td><td><input type="password" name="p" required style="width: 200px" class="form-control"></td></tr>
            <tr><td></td><td><input type="submit" class="btn btn-success" value="Login"></td></tr>
        </table><!--
        <center style="font-size: 11px">Username : <b>admin</b>, Password : <b>admin</b></center>
    --> </form>
        </div><!--/span-->
      </div><!--/row-->

    </div><!--/.fluid-container-->
    <center style="margin-top: -15px;"> 2018 &copy;<a href="https://ptpnix.co.id/">PTPNIX</a><br>
    <span style="color: red"></span>
    </center>
    </div>
  </body>
  </html>

Controller Admin.php