JavaScript to highlight current navigation item.

active-navigation-item.js

/**
 * Active Nav Item
 */

// Get the URL
var url = window.location;

// Select nav list item and select
// Will only work if string in href matches with location
$('ul.nav a[href="'+ url +'"]').parent().addClass('selected');

// Will also work for relative and absolute hrefs
$('ul.nav a').filter(function() {
  return this.href == url;
}).parent().addClass('selected');