Adding element to category but not to subcategories or articles

PHP
1

Hi everybody.

I am trying to find the way to insert a js file in a category but not in the articles in it.

Thus adding it to category-a, but not to category-a/whatever-article-might-be-published-here

I have tried with “if” and strpos functions with no result at all.

Some idea???

2

Can this be done by analysing the URL to see what ‘level’ the page is, like the CSS thing? Or is it a different set of criteria other than just looking at the level within the site structure?