Can someone help me in the right direction with the following?
I want to check the input of certain textfields (product attributes) on the productpage and depending on the input I want to execute some logic / show warnings / etc.
I would like to do this with a plugin and do not want to touch the core. I'm not sure on how to approach this. Can I just write a plugin that handles this part of the productpage or should I build a plugin for a whole new productpage.
I both cases I would like to know the steps for doing this. I wrote some plugins before but unfortunately I cannot figure out how to do this. (I already checked the manuals/forums and goole but with no result)
Thank you for your help!