Codeigniter form_open_multipart didn't respond - php

Question

Been trying out codeigniter and wanted to create a form with file upload using the upload class. However when i try to save the form, it didn't respond and just show the same page. I've been looking around, but I can't seem to find out how to make this work.
This is the controller Product.php
<?php
defined('BASEPATH') OR exit('No direct script access allowed');
Class Product extends CI_Controller{
function __construct(){
parent::__construct();
check_not_login();
$this->load->model('product_m');
}
public function index(){
$data['row'] = $this->product_m->get();
$this->template->load('template', 'product/data/product_data', $data);
}
public function add(){
$product = new stdClass();
$product->product_id = null;
$product->product_name = null;
$product->customer_name = null;
$product->supplier_name = null;
$product->weight = null;
$product->product_date = null;
$product->expired_date = null;
$product->image = null;
$product->barcode = null;
$data = array(
'page' => 'add',
'row' => $product
);
$this->template->load('template', 'product/data/product_form', $data);
}
public function edit($id){
$query = $this->product_m->get($id);
if($query->num_rows()>0){
$product = $query->row();
$data = array(
'page' => 'edit',
'row' => $product
);
$this->template->load('template', 'product/data/product_form', $data);
}else{
echo "<script>alert('Data not found');";
echo "window.location='".site_url('product')."';</script>";
}
}
public function process(){
$post = $this->input->post(null, TRUE);
if(isset($_POST['add'])){
$config['upload_path'] = './uploads/product';
$config['allowed_types'] = 'jpeg|pdf|jpg|png|doc|docs|xls|xlsx';
$config['max_size'] = 5120;
$config['file_name'] = 'product-'.date('ymd').'-'.substr(md5(rand()),0,10);
$this->load->library('upload', $config);
if(#$_FILES['image']['name'] !=null){
if($this->upload->do_upload('image')){
$post['image'] = $this->upload->data('file_name');
$this->product_m->add($post);
if($this->db->affected_rows() > 0){
$this->session->set_flashdata('success', 'Data saved successfully');
}
redirect('product');
}else{
$error = $this->upload->display_errors();
$this->session->set_flashdata('error', $error);
redirect('product/add');
}
}
else{
$post['image'] = null;
$this->product_m->add($post);
if($this->db->affected_rows() > 0){
$this->session->set_flashdata('success', 'Data saved successfully');
}
redirect('product');
}
}else if(isset($_POST['edit'])){
$this->product_m->edit($post);
}
}
public function del($id){
$this->product_m->del($id);
if($this->db->affected_rows() > 0){
$this->session->set_flashdata('Success', 'Data successfully deleted');
}
redirect('product');
}
}
Script for the form product_form.php
<section class="content-header">
<h1>
Product
<small>Add product</small>
</h1>
</section>
<section class ="content">
<div class="box">
<div class="box-header">
<h3 class="box-title"> product</h3>
<div class="pull-right">
<a href="<?=site_url('product')?>" class="btn btn-warning btn-flat">
<i class="fa fa-undo"></i> Back
</a>
</div>
</div>
<div class="box-body">
<div class="row">
<div class="col-md-4 col-md-offset-4">
<?php echo form_open_multipart('product/process');?>
<div class="form-group">
<label>Product Name *</label>
<input type="hidden" name="id" value="<?=$row->product_id?>">
<input type="text" name="product_name" value="<?=$row->product_name?>" class="form-control" required>
</div>
<div class="form-group">
<label>Customer Name *</label>
<input type="text" name="customer_name" value="<?=$row->customer_name?>" class="form-control" required>
</div>
<div class="form-group">
<label>Supplier Name *</label>
<input type="text" name="supplier_name" value="<?=$row->supplier_name?>" class="form-control" required>
</div>
<div class="form-group">
<label>Weight(kg) *</label>
<input type="number" name="weight" value="<?=$row->weight?>" class="form-control" required>
</div>
<div class="form-group">
<label>Product Date(dd/mm/yyyy) *</label>
<input type="text" name="product_date" value="<?=$row->product_date?>" class="form-control" required>
</div>
<div class="form-group">
<label>Expired Date(dd/mm/yyyy) *</label>
<input type="text" name="expired_date" value="<?=$row->expired_date?>" class="form-control" required>
</div>
<div class="form-group">
<label>Technical Data</label>
<input type="file" name="image" class="form-control" >
</div>
<!-- FORM BARCODE -->
<div class="form-group">
<label>Barcode</label>
<input name="barcode" class="form-control" value="
<?php
$angka = rand(1000000,9999999);
$random = rand(0,25);
$random1 = rand(0,25);
$random2 = rand(0,25);
$name = array("A", "B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q",
"R","S","T","U","V","W","X","Y","Z");
echo $name[$random],$name[$random1],$name[$random2],$angka;
$row->barcode
?>" readonly>
</div>
<div class="form-group">
<button type="submit" name="<?=$page?>" class="btn btn-success btn-flat">
<i class="fa fa-paper-plane"> Save</i>
</button>
<button type="Reset" class="btn btn-flat"> Reset</button>
</div>
<!-- </form> -->
<?php echo form_close();?>
</div>
</div>
</div>
</div>
</section>

Answer 1

Load the form helper.
function __construct(){
parent::__construct();
check_not_login();
$this->load->model('product_m');
$this->load->helper('form');
}