Help with Auto Adding Gift to Cart

[kamelion0927]

I've managed to somewhat install a function that auto adds a gift to my cart if the cart subtotals over a certain amount by following the instructions included in the Wiki. The item will add to the cart if my cookies are cleared and the subtotal of the cart is over the set amount and will remove automatically if the cart subtotal drops below the set amount, but if I add more products to the cart to bring the total back above the set amount, the gift will not automatically add back to the cart.

In includes/auto_loaders, I've added a file called config.freeProduct.php with this code:

<?php
$autoLoadConfig[10][] = array('autoType'=>'class',
                              'loadFile'=>'observers/class.freeProduct.php');
$autoLoadConfig[90][] = array('autoType'=>'classInstantiate',
                              'className'=>'freeProduct',
                              'objectName'=>'freeProduct');
?>

Then I created a file called class.freeProduct.php in includes/classes/observers with this code:

<?php
/**
 * Observer class used to add a free product to the cart if the user spends more than $x
 *
 */
class freeProduct extends base {
  /**
   * The threshold amount the customer needs to spend.
   * 
   * Note this is defined in the shops base currency, and so works with multi currency shops
   *
   * @var decimal
   */
  var $freeAmount = 129;
  /**
   * The id of the free product.
   * 
   * Note. This must be a true free product. e.g. price = 0 Also make sure that if you don't want the customer
   * to be charged shipping on this, that you have it set correctly.
   *
   * @var integer
   */
  var $freeProductID = 1268;
  /**
   * constructor method
   * 
   * Attaches our class to the $_SESSION['cart'] class and watches for 2 notifier events.
   */
  function freeProduct() 
  {
    global $zco_notifier;
    $zco_notifier->attach($this, array('NOTIFIER_CART_ADD_CART_END'));
    $zco_notifier->attach($this, array('NOTIFIER_CART_REMOVE_END'));
  }
  /**
   * Update Method
   * 
   * Called by observed class when any of our notifiable events occur
   *
   * @param object $class
   * @param string $eventID
   */
  function update(&$class, $eventID, $paramsArray = array()) {

  if ($eventID == 'NOTIFIER_CART_REMOVE_END' && (isset($_SESSION['freeProductInCart']) && $_SESSION['freeProductInCart'] = TRUE ))
  {
    if (!$_SESSION['cart']->in_cart($this->freeProductID))
    {
      $_SESSION['userRemovedFreeProduct'] = TRUE;
    }
  }

  if (!isset($_SESSION['userRemovedFreeProduct']) || $_SESSION['userRemovedFreeProduct'] != TRUE) 
  {
    if ($_SESSION['cart']->show_total() >= $this->freeAmount && !$_SESSION['cart']->in_cart($this->freeProductID) )   
    {
      $_SESSION['cart']->add_cart($this->freeProductID);
      $_SESSION['freeProductInCart'] = TRUE;  
    }
  }
 
  if ($_SESSION['cart']->show_total() < $this->freeAmount && $_SESSION['cart']->in_cart($this->freeProductID) ) 
  {
    $_SESSION['cart']->remove($this->freeProductID);
    }
  }  
}
?>

I know that it's picking up the new classes because I had issues with the original coding in the wiki (I had to change

  function freeProduct() {
    $_SESSION['cart']->attach($this, array('NOTIFIER_CART_ADD_CART_END', 'NOTIFIER_CART_REMOVE_END'));
  } 

to

  function freeProduct() 
  {
    global $zco_notifier;
    $zco_notifier->attach($this, array('NOTIFIER_CART_ADD_CART_END'));
    $zco_notifier->attach($this, array('NOTIFIER_CART_REMOVE_END'));
  } 

and without the change, I was getting a blank screen and an error in the debugging utility).

So I know that the problem lies somewhere after the code I changed - or maybe it has to do with the changes. At this point I'm stumped and any help would be greatly appreciated.

Thanks in advance.

[kamelion0927]

I'm pretty sure I fixed it. It's now automatically adding and removing the gift from the cart when the total hits or goes below the target amount as well as not causing errors in the debugging utility - and all I had to do was rearrange and take out some of the function code.

I used the same autoload file (config.freeProduct.php) but this is the code I used in includes/classes/observers/class.freeProduct.php

<?php
/**
 * Observer class used to add a free product to the cart if the user spends more than $x
 *
 */
class freeProduct extends base {
  /**
   * The threshold amount the customer needs to spend.
   * 
   * Note this is defined in the shops base currency, and so works with multi currency shops
   *
   * @var decimal
   */
  var $freeAmount = youramount;
  /**
   * The id of the free product.
   * 
   * Note. This must be a true free product. e.g. price = 0 Also make sure that if you don't want the customer
   * to be charged shipping on this, that you have it set correctly.
   *
   * @var integer
   */
  var $freeProductID = yourproductid;
  /**
   * constructor method
   * 
   * Attaches our class to the $_SESSION['cart'] class and watches for 2 notifier events.
   */
  function freeProduct() {
    $_SESSION['cart']->attach($this, array('NOTIFIER_CART_ADD_CART_END'));
    $_SESSION['cart']->attach($this, array('NOTIFIER_CART_REMOVE_END'));
  }
  /**
   * Update Method
   * 
   * Called by observed class when any of our notifiable events occur
   *
   * @param object $class
   * @param string $eventID
   */
   
function update(&$class, $eventID, $paramsArray) {
if ($_SESSION['cart']->show_total() >= $this->freeAmount && !$_SESSION['cart']->in_cart($this->freeProductID) )   
    {
      $_SESSION['cart']->add_cart($this->freeProductID);
      $_SESSION['freeProductInCart'] = TRUE;  
    }
  if ($_SESSION['cart']->show_total() < $this->freeAmount && $_SESSION['cart']->in_cart($this->freeProductID) ) 
  {
    $_SESSION['cart']->remove($this->freeProductID);
  }
  if ($_SESSION['cart']->in_cart($this->freeProductID)) 
  {
    $_SESSION['cart']->contents[$this->freeProductID]['qty'] = 1;
  }
  }
 }
?>

Just replace youramount and yourproduct id with the variables that match your site.

Hope this helps someone out.

[SHK]

Hope this helps someone out.

Sure did. Thanks!