controller

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

class Shopping_cart extends CI_Controller {

 function index()
 {
  $this->load->model("shopping_cart_model");
  $this->load->library(array("template","simple_login"));
  $this->simple_login->cek_login();
  $data["data_barang"] = $this->shopping_cart_model->fetch_all();
    $this->template->set('title', 'shopping_cart');
        $this->template->load('blank', 'contents' , 'shopping_cart', $data);
 }


 function add()
 {
  $this->load->library("cart");
  $data = array(
   "id"  => $_POST["id_barang"],
   "name"  => $_POST["nama_barang"],
   "qty"  => $_POST["quantity"],
   "price"  => $_POST["jenis_barang"]
  );
  $this->cart->insert($data); //return rowid
  echo $this->view();
 }
function insert() {
    $this->load->library("cart");
$data =array(
     "id"  => $_POST["id_barang"],
   "name"  => $_POST["nama_barang"],
   "qty"  => $_POST["quantity"],
   "price"  => $_POST["jenis_barang"]
);
$query=$this->db->insert('barang_masuk', $data);
echo $this->view();
}
 function load()
 {
  echo $this->view();
 }

 function remove()
 {
  $this->load->library("cart");
  $row_id = $_POST["row_id"];
  $data = array(
   'rowid'  => $row_id,
   'qty'  => 0
  );
  $this->cart->update($data);
  echo $this->view();
 }
 function save(){

  $shopping_cart_data = $this->input->post('data');
  $this->load->model('shopping_cart_model');
  $status->$this->shopping_cart_model->save($data);

  $this->output->set_content_type('application/json');
  echo json_encode(array('status' => $status));
 }

 function clear()
 {
  $this->load->library("cart");
  $this->cart->destroy();
  echo $this->view();
 }

 function view()
 {
  $this->load->library("cart");
  $output = '';
  $output .= '
  <h3>Data Barang Yang Akan Dimasukkan</h3><br />
  <div class="table-responsive">
   <div align="right">
    <button type="button" id="clear_cart" class="btn btn-warning">Clear Cart</button>
   </div>
   <br />
   <table class="table table-bordered">
    <tr>
     <th width="40%">Name</th>
     <th width="15%">Quantity</th>
     <th width="15%">Kode Jenis</th>
     <th width="15%">Total</th>
     <th width="25%">Action</th>
    </tr>

  ';
  $count = 0;
  foreach($this->cart->contents() as $items)
  {
   $count++;
   $output .= '
   <tr>
    <td>'.$items["name"].'</td>
    <td>'.$items["qty"].'</td>
    <td>'.$items["price"].'</td>
    <td>'.$items["subtotal"].'</td>
    <td><button type="button" name="remove" class="btn btn-danger btn-xs remove_inventory" id="'.$items["rowid"].'">Remove</button></td>
   </tr>
   ';
  }
  $output .= '
   <tr>
    <td colspan="4" align="right">Total</td>
    <td>'.$this->cart->total().'</td>
    <td><button type="button" name="simpan" class="btn btn-warning btn-xs save_inventory" id="rowid">Simpan</button></td>
   </tr>
  </table>

  </div>
  ';

  if($count == 0)
  {
   $output = '<h3 align="center">Cart is Empty</h3>';
  }
  return $output;
 }
}