How to get Twitter-Bootstrap navigation to show active link?

Question

I\'m not understanding how Twitter Bootstrap does active links for the navigation. If I have a regular navigation like this (with ruby on rails linking):

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Answer 1

Shortest code 

This deals with BOTH nav, and sub nav list elements. You can pass either an array a single path and will deal with both.

application_helper

# Active page method
def ap(p:);'active' if p.class == Array ? p.map{|m| current_page? m}.any? : (current_page? p) end

view (html.erb)

  
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