Originally Posted by
mc12345678
Couple of options come to mind:
Currently trying to use the form method, as presented there is form posting information that is missing, namely the hidden field of securityToken that is generated when using the zen cart built in: zen_draw_form function found in includes/functions/html_output.php
Another is to modify the processing code when the action of add_product is identified. One place in which this can be done is within the init_cart_handler.php file found in includes/init_includes
Yet another software approach is to add something to includes/extra_cart_actions to process the applicable request before actually adding to the cart. (I suggest this part of the process as it will withstand upgrading by not being overwritten, though must also be carried over and reviewed for applicability as necessary.)
Another is to use ajax to pull the data when selections are made; however, this only works when/if javascript is enabled and therefore would not offer the information/check if disabled locally by the visitor.
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