Discount for Multiple of Same Product (Buy X Get X Free)

Please see the attached. The green column is the ID of the line being passed to the cart. The beige column is the code that represents the color option of the product. As we can see then, we have ordered 6 of the same item but in different color codes. Now, lets say we have a discount campaign of the kind where upon buying X you get X free. So in this scenario, if the user buys 5 or more they get 1 free. Now, I do know there is the ability to do that in the Ecart Discount Dialog (see the second snaphot). My question related to; how do I make it so that in the Ecart Discount Dialogue I can refer to dynamic values and not those I have type in (hard coded if you will).

My requirement for such is so that I let the website manager determine which product he/she can define as being in this campaign so they do not have to contact me to update the cart (quite) periodically.

Can this be done?

It is going to take some custom coding to do this. We could help you with it in a premier support ticket.

Basically we would have to write a custom function that loops through the cart and calculates the discount across the multiple lines.

Premier support is $99.99 per session and this could be done in one session. We call you on the phone and do screen sharing to work with you one your site directly to implement the features you need.

Hi Ray

Thanks for you reply. After making sure there was no way of doing this in the eCart Dialog Wizard, I implemented this solution;

<?php
if (!$theCart->IsEmpty())
{
$theCart->MoveFirst();
while (!$theCart->EOF())
{
$_SESSION['item_'.$theCart->DisplayInfo("ID")] = $theCart->GetInfo($theCart->DisplayInfo("ID"), "Quantity");
$theCart->MoveNext();
}
}
$theCart->MoveFirst();
?>

This dynamically sets a session name called "item_" with a suffix of the that item's ID and then using GetInfo Function to obtain the QTY of that item in the cart.

And then, in the Calculations Tab, I did did this;

($_SESSION['item_'.[ID]] >= [disThreshold]) ? ([CartDiscountType] == '%') ? [Quantity] * [Price] * [CartThresholdDiscount] / 100 : [Quantity] * [CartThresholdDiscount]: ''

So, if the $_SESSION['item_$foo'] is greater than or equal to the disThreshold (taken from the database for that item) then the discount is is calculated and applied to the cart.

This works, but there may be another way.

OK. Thought about this a little more and rather than move through the cart I have implemented a foreach instead, like this;

<?php
$temp = array();
foreach($theCart->Items as $cart)
{
if(isset($temp[$cart->ID]))
{
$temp[$cart->ID]=$temp[$cart->ID]+$cart->Quantity;
$_SESSION['item_'.$temp[$id]] = $temp[$productID];
}
else
{
$temp[$cart->ID]=$cart->Quantity;
}
}
?>

Now it only returns unique pairs // for ID - Quantity

Just in case someone else might like to us this