CodeIgniter - 无法运行$ this-> input-> post（'inputName'）; 在模块化扩展中

Question

As my title, I tried call that method but I got an error:

Fatal error: Call to a member function post() on a non-object in C:\xampp\htdocs\cifirst\application\modules\front\controllers\shopping.php on line 11

If I create a controller not in module, that method I can use very easy but in this case can not (everything code in method below can not run). This is my code:

 public function add_to_cart() {
  $data = array(
   'id' => $this->input->post('productId'), // line 11
   'name' => $this->input->post('productName'),
   'price' => $this->input->post('productPrice'),
   'qty' => 1,
   'options' => array('img' => $this->input->post('productImg'))
  );

  $this->load->library('MY_Cart');
  $this->cart->insert($data);

  //redirect($_SERVER['HTTP_REFERER']);
  //echo $_POST['productId'].'-'.$_POST['productName'];
 }

And this code doesn't work too:

public function __construct() {
    $this->load->library('cart');
    $this->load->helper('form');
}

I'm using XAMPP 1.8.1, CodeIgniter 2.1.3 and newest MX. Please help me!

Answer 1

When you're using CodeIgniter functions outside of controllers, models, and views you need to get an instance of Codeigniter first.

class MyClass {
    private $CI;

    function __construct() {
        $this->CI =& get_instance();
        $this->CI->load->library('cart');
        $this->CI->load->helper('form');
    }

    public function someFunction() {
        $var = $this->CI->input->post("someField");
    }
}