Empty checkout form items, (especially checkboxes) may not be saved

[jbeales]

I have added a checkbox to my checkout form. When it's checked WPeC saves the value of the checkbox as expected, but if it's not checked the value is not saved - most likely because its array key does not exist in the $_POST array.

I believe the culprit is here, in _wpsc_checkout_customer_meta_update() in theme-engine-v1/helpers/ajax.php, where post data is only saved if isset( $checkout_post_data[$form_field['id']] ) returns true - and that won't happen for an unchecked checkbox.

[JeffPyeBrook]

John,

I think I fixed this in my checkout plugin by making sure that every <INPUT type="checkbox" ... that is generated has a companion hidden input immediately before it. That causes the $_POST value for that input to always be present in the HTTP request doing the cart action or processing the payment.

Perhaps we should adjust the checkout fields logic in core to do the same?

Jeff