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Thu, 07/24/2008 - 14:50
 I am writing a custom module that deals with the shopping cart. I need to remove the "Update cart" button and add an "Empty cart" button. I can easily hide the "Update cart" button via CSS. My question is: How can I add an "Empty cart" button and write code to delete all the items from the cart? - or - How can I override the functionality of the "Update cart" button to delete all the items from the cart? I will appreciate being pointed in the right direction! Thanks.
Re: Add "Empty cart" Button
I'm curious if you can add a submit handler to that button using hook_form_alter() that would get called instead of the normal form submit handler... that would probably do what you need if it works.
Thanks, Ryan.
I appreciate
Thanks, Ryan. I appreciate your suggestionn. I only had to modify uc_cart.module in two places: 1. function uc_cart_view_form($items = NULL) { I attempted to override these functions in my module; however, they were so intertwined with other functions that I would have had to override many functions that I wasn't modifying. That seemed to make a mess of my module and removed a big chunk of uc_cart.module from future updates. The most direct approach was to hack the core uc_cart.module with these two short additions. I don't like doing it that way, but I could see no other clear approach. Since the two additions are small and isolated, it was not a problem to re-edit ver 1.2 of uc_cart.module this morning. Do you think you folks will add an "Empty cart" button to the cart in the future? -Paul   
Re: Thanks, Ryan.
Ryan's suggestion was the right one. It's easy to use hook_form_alter() to remove the update button, add an empty cart button, then handle the empty cart button press in your own submission function - all without modifying core. In your own module "example_module", add this code: function example_module_form_alter($form_id, &$form) {
TR,
Super! That worked
TR, Super! That worked great and, obviously, is much cleaner. This is my first dig into a custom module for Ubercart. I guess, in my own naivete, I presumed that I had to put the entire contents of the affected functions in my module, rather than add bits that conditionally only affected parts of the existing uc modules. I've got a lot to learn! I'm a bit puzzled by the purpose of the two statements in: $form['#submit'] = array(Perhaps you could clue me in. Thanks for your help! -Paul
Re: TR,
That code specifies the function(s) to be run when the form is submitted. By default, when the uc_cart_view_form is submitted, Drupal will look for and execute uc_cart_view_form_submit() (append _submit to the form name). What I'm doing is to declare that two functions should be executed upon form submit: the first is example_module_cart_view_form_submit() which I use to handle the "Empty cart" button press, the second is uc_cart_view_form_submit(), which is the default submit handler and takes care of any other actions on that form, like handling the "Checkout" button. The NULL is an array() of extra arguments to pass to these functions - nothing extra is needed in this case, which is why it's set to NULL.
Re: Re: TR,
Thanks. Your explanation is very helpful. At first blush I thought the '=> NULL' part was in some way turning the calls 'off', i.e. setting them to 'nothing'. Is there a significance to the sequence in which the two calls are declared?
Re: Re: Re: TR,
First one is called first, second one is called second. I would point you to a good reference on the Forms API if I knew of one. Unfortunately, drupal.org has poor documentation on this topic (found at http://drupal.org/node/37775 FWIW).
Re: Add "Empty cart" Button
I rewrite this code for Drupal 6 <?phpAlso I create module UC_EMPTY_CART
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