How to make voucher field mandatory or invisible depending on the category

[pfs007]

Hi everybody,

 

I am trying to adapt my voucher field thus :

1 - so that it is invisible for products of a certain category, i.e. the giftcards' category, whose voucher code will be use below

2 - so that it becomes mandatory for all products buyable with the voucher I got on my giftcard above

 

Could anyone help me realise that ? I am using the latest version of PS.

 

Have a nice day.

 

PFS

Edited June 18, 2015 by pfs007 (see edit history)