Is there some way to trigger adding a specific product to an open cart?

[DrByte]

Do you know if anyone ever pushed that tutorial example far enough to know it will work?

I know I did, years ago. Not sure if I still have that code around anyplace.
It's very challenging to also have an Admin interface to manage all the possible options. What I'd done was all handled in a PHP file, without any admin-side controls about what products qualified with other products etc. Very rigid implementation. But certainly doable. If you want nice admin controls and switches and fancy dialogs you'll be needing to invest more to provide that.

[lat9]

Note, too, that the example should be updated to show the use of the __construct function (that's going to be needed for PHP 7.0 compliance), e.g. changing references like:

<?php
 class myObserver extends base {
   function myObserver() {
     $this->attach($this, array('NOTIFIER_CART_ADD_CART_END'));
   }
...
 }

to

<?php
 class myObserver extends base {
   function __construct() {
     $this->attach($this, array('NOTIFIER_CART_ADD_CART_END'));
   }
...
 }

[DrByte]

Note, too, that the example should be updated to show the use of the __construct function (that's going to be needed for PHP 7.0 compliance), e.g. changing references like:

<?php
 class myObserver extends base {
   function myObserver() {
     $this->attach($this, array('NOTIFIER_CART_ADD_CART_END'));
   }
...
 }

to

<?php
 class myObserver extends base {
   function __construct() {
     $this->attach($this, array('NOTIFIER_CART_ADD_CART_END'));
   }
...
 }

Good point. Updated. Thanks.

[David R]

Good point. Updated. Thanks.

Thanks very much!

We don't need any admin interface component to this, and I can repurpose some of the dialog functions we use now. I'll try to get it working from the tutorial as it stands, so I don't introduce any new troubleshooting issues with the __construct function for now.

[soxophoneplayer]

Out of curiosity...is the idea to add the free product before or after shipping is calculated? And/or would the customer be able to remove the free item from their cart if they didn't want it, or if there was a shipping cost and they didn't want to pay?

[David R]

Out of curiosity...is the idea to add the free product before or after shipping is calculated? And/or would the customer be able to remove the free item from their cart if they didn't want it, or if there was a shipping cost and they didn't want to pay?

I've got the luxury of working on this in the narrow confines of our situation: the added product is free, shipping is free, these items are not taxable.

There is at least one old thread on this topic where the writer was protesting the propriety of adding an item to a customer's cart. I'm sure the questions of tax and shipping would amplify that if someone is trying to make a general purpose contribution.

In what again is our narrow case, the goal is to have this work automatically without requiring any additional steps on the customer's part, and (ideally) to not allow them to trick the system by removing qualifying items during the process. Failing that last, we will have to screen each order during the promotion to be sure it really qualifies.

[DrByte]

In this older post I made I gave some code examples that might be helpful as inspiration for your situation.