Rework the checkout form from multistep to multi-form [#842114]

Currently, the checkout form is implemented as a multistep form using a single form ID. Damien's proposal in conjunction with defining checkout pages via hook_commerce_checkout_pane_info() is to rework this so there's a unique form ID per page. We can use the same form builder function, but the ID will differ and the URL used to access a specific page will differ with automatic redirection to the proper page based on the status of an order. This will also require adding an order state and status for the various checkout pages and making sure they get updated as the order proceeds through checkout. I'll open a separate issue to address reverting an order from a checkout order to a shopping cart order.

Comments

Comment #1

rszrama commented 30 June 2010 at 22:47

We'll need to move the checkout router to the cart module as well.

Comment #2

rszrama commented 1 July 2010 at 14:25

Things to consider:

Proper access control so users don't guess an order ID and checkout someone else's order.
Need extra meta data for checkout pages to restrict form submissions (i.e. on the complete page).
commerce_checkout_pages() should skip empty pages when determining prev_page and next_page.
Buttons for moving through the form can now include the page's name (i.e. "Proceed to payment" instead of just "Continue").