we'll be using jquery..

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Here are a few ideas I had after using PGP:

It would be nice if, when someone enters a quantity in the cart, when he hits the
enter key, it updates the cart. Seems to me that right now, it submits the "delete"
button (which is the first @@form.action in the class, so it might use the first one
by default), and like I didn't check anything, nothing happen, and the price is not
updated.

Also, the version of jquery in getpaid is pretty old. It be great to update it.

We could potentially add an event listener on the quantity input, so that when the
enter key is pushed, it submits the "update" button instead of the "delete" button.

I updated the jquery version in the PloneGetPaid product, and used it a bit for #110.

Drag and drop items into the shopping cart would be nice. Maybe have a jQuery
draggable available to integrate into listings or full views of buyable items and
make the shopping cart portlet droppable. 

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This ticket is too vague. It needs to be split into other tickets with specific
things to implement.