Codeigniter submit form not working, blank page - codeigniter

Question

I'm attempting to submit a form with codeigniter and when i submit the form a get a blank page. Where did i go wrong?
View
echo "<form class='order_ctn_parent' method='POST' action='add/insert_orders'>";
//inputs
echo "</form>";
Controller
class Add extends CI_Controller {
public function __construct()
{
parent::__construct();
}
public function index() {
}
public function insert_orders()
{
$this->load->model('order_model', 'order');
$this->order->insert_orders();
redirect('view_orders', 'location');
}
}
Model
class Order_model extends CI_Model {
public function insert_orders()
{
$DB2 = $this->load->database('orders', TRUE);
$timber_array = $this->input->post("timber_choose");
$products_array = $this->input->post("product_choose");
$qty_array = $this->input->post("quantity");
$price_array = $this->input->post("price");
$qty_array = $this->input->post("quantity");
$loop = 0;
foreach($products_array as $product) {
$price = str_replace("£","",$price_array[$loop]);
$data = array(
'product_code' => "",
'timber_type' => $timber_array[$loop],
'product' => $product,
'quantity' => $qty_array[$loop],
'price' => $price
);
$DB2->insert('timber_order_products', $data);
$loop++;
}
}
}

Answer 1

Try something like this
?>//end of php
<form class='order_ctn_parent' method='POST' action='<?php echo base_url()?>add/insert_orders'>
</form>
and load model in __construct(), like this
public function __construct()
{
parent::__construct();
$this->load->model('order_model', 'order');
}
and no need of check $DB2 = $this->load->database('orders', TRUE);
and Codeigniter insert should be Like This

Answer 2

Please check your url after submitting . i am sure your form action is not working . give proper controller and its function url into Form action . example is here .
<?php echo site_url('add/insert_orders);?>
where add will be your controller and insert_orders will be function of add controller.