CodeIgniter | Sometimes the user session destroyed when adding cart item - php

Question

Hi im working on my workshop tools project.
Now i have some strange action sometimes when i pressed the add to cart button (mine was named pinjam) it just going back to the login page because the session destroyed. Anyone has this strange thing happened? or Can you help me?
The scenario is like this..
I pressed the add to cart button on one of much tools that can i borrow, then it post to the add_to_cart function on my controller and reload the #cart_content div on that page with new added data with jquery / ajax
Controller Siswa
function index(){
$data['guru'] = $this->model_akun->getnamaguru();
$data['data']=$this->model_alat->getAll();
$this->load->view('siswa/dashboard',$data);
}
function add_to_cart(){
if($this->model_alat->validate_add_cart_item() == TRUE){
// Check if user has javascript enabled
if($this->input->post('ajax') != '1'){
redirect('siswa'); // If javascript is not enabled, reload the page with new data
}else{
echo 'true'; // If javascript is enabled, return true, so the cart gets updated
}
}
}function show_cart(){
$this->load->view('siswa/cart');
}
Model_Alat
function validate_add_cart_item(){
$id = $this->input->post('id_alat'); // Assign posted id_alat to $id
$cty = $this->input->post('quantity'); // Assign posted quantity to $cty
//$this->db->where('id_alat', $id); // Select where id matches the posted id
$query = $this->db->query('select * from alat where id_alat="'.$id.'"')->result(); // Select the products where a match is found and limit the query by 1
//$ss = $this->input->post('ajax');
//echo $query['id_alat'];
//echo "<script>alert(".$cty.");
// </script>";
// Check if a row has been found
if($query > 0){
foreach ($query as $row){
$data = array(
'id' => $id,
'qty' => $cty,
'price' => '0',
'name' => $row->nama_alat
);
$this->cart->insert($data);
return TRUE;
}
// Nothing found! Return FALSE!
}else{
echo "<script>alert('FALSE no rows :(');</script>";
return FALSE;
}
}
JQUERY
<script>
$(document).ready(function() {
/*place jQuery actions here*/
var link = "/weteies/index.php/"; // Url to your application (including index.php/)
$("div.subalat form").submit(function() {
// Get the product ID and the quantity
var id = $(this).find('input[name=id_alat]').val();
var qty = $(this).find('input[name=quantity]').val();
$.post(link + "siswa/add_to_cart", { id_alat: id, quantity: qty, ajax: '1' },
function(data){
// Interact with returned data
if(data == 'true'){
$.get(link + "siswa/show_cart", function(cart){ // Get the contents of the url cart/show_cart
$("#cart_content").html(cart); // Replace the information in the div #cart_content with the retrieved data
});
}else{
alert("Product does not exist");
}
});
});
});
siswa/cart (for viewing the cart list)
##siswa/cart view
<div class="table-responsive">
<?php echo form_open('siswa/update_cart'); ?>
<table class="table table-bordered">
<thead >
<tr>
<th>Alat</th>
<th>Jumlah</th>
<!--<th>Total</th>-->
<th>Actions</th>
</tr>
</thead>
<tbody>
<?php $a=0; $b=0;foreach($this->cart->contents() as $items): ?>
<tr>
<!--<input type="hidden" id="id_peminjam" name="id_peminjam" value="'.$this->session->userdata('ses_id').'"/>-->
<td><?php echo form_hidden('rowid['.$a.']', $items['rowid']);
echo $items['name']; ?></td>
<td><?php echo form_input(array('name' => 'qty['.$a.']', 'value' => $items['qty'], 'maxlength' => '2'), '', 'class="form-control form-control-sm"'); ?></td>
<!--<td><button type="button" id="'.$items['rowid'].'" class="romove_cart btn btn-danger btn-sm">Cancel</button></td>-->
<td><?php echo form_submit('', 'Update', 'class="btn btn-accept btn-sm"');
$b=$a+1;?>
</tr>
<?php $a++; endforeach; ?>
</tbody>
</table>
<?php echo form_hidden('jumlah_alat', $b);
echo form_close();?>
<?php echo form_open('siswa/sub_cart'); ?>
<table class="table">
<tr>
<td >
<select name="id_guru" class="form-control form-control-sm">
<option>Pilih Guru</option>
<?php foreach($guru as $gurus): echo '<option value='.$gurus->id_akun.'>'. $gurus->nama .'</option>'; endforeach;?>
</select>
</td>
<td>
<?php $hitung=0; $b=0; foreach($this->cart->contents() as $items): ?>
<?php echo form_hidden('id_alat'.$hitung.'', $items['id']);
echo form_hidden('jumlah_pinjam'.$hitung.'', $items['qty']);
echo form_hidden('id_siswa', $this->session->userdata('ses_id'));
$b=$hitung+1;
$hitung++;
endforeach;
echo form_hidden('jumlah_alat', $b);
echo anchor('siswa/empty_cart', 'Hapus Semua', 'class="btn btn-danger btn-sm col-sm-5"'); ?>
<?php echo form_submit('', 'Pinjam!', 'class="btn btn-primary btn-sm col-sm-5"');?>
</td>
</tr>
</table>
<?php echo form_close(); ?>
</div>
FORM siswa/dashboard
<!DOCTYPE html>
<head>
<?php $this->load->view("admin/_partials/head.php") ?>
</head>
<body id="page-top">
<!-- Navbar-->
<?php $this->load->view("siswa/_partials/navbar.php") ?>
<div id="wrapper">
<!-- Sidebar-->
<?php $this->load->view("siswa/_partials/sidebar.php") ?>
<div id="content-wrapper">
<div class="container-fluid">
<div class="row ">
<div class="col-md-6">
<div class="card mb-3">
<h4 class="card-header">Alat Tersedia</h4>
<br>
<div class="row card-body">
<?php foreach ($data as $row) : ?>
<div class="col-md-6">
<div class="card mb-3">
<div class="card-header text-center"><?php echo $row->nama_alat;?>
</div>
<div class="card-body">
<div class="row">
<div class="col-md-7">
Tersedia
</div>
<div class="col-md-5">
<input value="<?php echo $row->jumlah;?>" class="form-control form-control-sm" readonly>
</div>
</div>
<div class="subalat">
<?php echo form_open(''); ?>
<div class="row">
<div class="col-md-7">
Mau Brp?
</div>
<div class="col-md-5">
<?php echo form_hidden('id_alat', $row->id_alat);
echo form_input('quantity', '1', 'maxlength="2" class="form-control form-control-sm"'); ?>
</div>
</div>
<br>
<?php echo form_submit('add', 'Pinjam','class="btn btn-success btn-block col-md"'); ?>
<?php echo form_close(); ?>
</div>
</div>
</div>
</div>
<?php endforeach;?>
</div>
</div>
</div>
<div class="col-md-6">
<div class="card mb-3">
<h4 class="card-header">List Pinjam</h4>
<!--<div class="card-body">-->
<div id="cart_content">
<?php $this->load->view('siswa/cart'); ?>
</div>
<!--</div>-->
<div class="card-footer small text-muted">
Jika jumlah alat nya 0(nol), alat akan dihapus. Page rendered in <strong>{elapsed_time}</strong> seconds.
</div>
</div>
</div>
</div><!-- /.row -->
</div><!-- /.content-fluid -->
<!-- Sticky Footer -->
<?php $this->load->view("siswa/_partials/footer.php") ?>
</div>
<!-- /.content-wrapper -->
</div>
<!-- /#wrapper -->
<?php $this->load->view("siswa/_partials/scrolltop.php") ?>
<!-- Modal-->
<?php $this->load->view("siswa/_partials/modal.php") ?>
<!-- Js-->
<?php $this->load->view("siswa/_partials/js.php") ?>
</body>
<script>
$(document).ready(function() {
/*place jQuery actions here*/
var link = "/weteies/index.php/"; // Url to your application (including index.php/)
$("div.subalat form").submit(function() {
// Get the product ID and the quantity
var id = $(this).find('input[name=id_alat]').val();
var qty = $(this).find('input[name=quantity]').val();
$.post(link + "siswa/add_to_cart", { id_alat: id, quantity: qty, ajax: '1' },
function(data){
// Interact with returned data
if(data == 'true'){
$.get(link + "siswa/show_cart", function(cart){ // Get the contents of the url cart/show_cart
$("#cart_content").html(cart); // Replace the information in the div #cart_content with the retrieved data
});
}else{
alert("Product does not exist");
}
});
});
});
</script>
</html>
Login controller
class Login extends CI_Controller{
function __construct(){
parent::__construct();
$this->load->model("model_login");
}
function index(){
$this->form_validation->set_rules('email', 'Email', 'required|trim|valid_email');
$this->form_validation->set_rules('password', 'Password', 'required|trim');
if($this->form_validation->run()==FALSE){
$session = $this->session->userdata('isLoggedin');
if($session == FALSE){
$this->load->view('login');
}
else{
redirect('');
}
}
else{
$email=$this->input->post('email');
$password=$this->input->post('password');
$cek_akun=$this->model_login->auth_akun($email,$password);
if($cek_akun->num_rows() > 0){
$user_data=$cek_akun->row_array();
$this->session->set_userdata('isLoggedin',TRUE);
$this->session->set_userdata('ses_id',$user_data['id_akun']);
$this->session->set_userdata('ses_nama',$user_data['nama']);
if($user_data['level']=='admin'){ //level admin
$this->session->set_userdata('level','admin');
redirect('admin');
}
else if($user_data['level']=='aspiran'){ //level aspiran
$this->session->set_userdata('level','aspiran');
redirect('aspiran');
}
else if($user_data['level']=='guru'){ //level guru
$this->session->set_userdata('level','guru');
redirect('guru');
}
else if($user_data['level']=='siswa'){ //level siswa
$this->session->set_userdata('level','siswa');
redirect('siswa');
}
}
else{
$this->load->view('login');
echo "<script>alert('Failed Login: Check your username and password!');
</script>";
}
}
}
function logout(){
$this->session->sess_destroy();
$url=base_url('');
redirect($url);}}