How to write a new module showing in specified category or product?

[ed0522]

I want to write a module and I want this module can show in specified category or products.

 

For example, I want to add a comment module just in the T-shirt category, not in other products. 

 

You know, if we use hook or override in a product page, all the product page will show the module. I don't want this. I want the module can be showed in a specified product.

 

Can someone help me find a way to achieve it?

Edited October 2, 2015 by ed0522 (see edit history)

[jgamio]

If you use a hook the just check the id before set a tlp

 

if you dont need show something dont set the tpl just do the return on the function  

[ed0522]

yes, it's a good idea to identify the product by the id.