将活动类添加到导航栏

I'm sort of new to this, so please forgive me asking, but I'm using a slightly modified bootstrap navbar, and had the active class being properly assigned untill recently, but for some reason it stoped working with the last changes I made... (tried to revert it to see what screwed it up, to no avail...) Could some gentle soul enlighten me on how to make it work as it should?I'm sort of new to this, so please forgive me a