application.js

$(document).ready(function(){

  // Example dropdown for topbar nav
  $("body").bind("click", function(e) {
    $("ul.menu-dropdown").hide();
    $('a.menu').parent("li").removeClass("open").children("ul.menu-dropdown").hide();
  });
  $("a.menu").click(function(e) {
    var $target = $(this);
    var $parent = $target.parent("li");
    var $siblings = $target.siblings("ul.menu-dropdown");
    var $parentSiblings = $parent.siblings("li");
    if ($parent.hasClass("open")) {
      $parent.removeClass("open");
      $siblings.hide();
    } else {
      $parent.addClass("open");
      $siblings.show();
    }
    $parentSiblings.children("ul.menu-dropdown").hide();
    $parentSiblings.removeClass("open");
    return false;
  });

  // table sort example
  $("#sortTableExample").tablesorter( {sortList: [[1,0]]} );

  // add on
  $('.add-on :checkbox').click(function() {
    if ($(this).attr('checked')) {
      $(this).parents('.add-on').addClass('active');
    } else {
      $(this).parents('.add-on').removeClass('active');
    }
  });


  // scroll spyer
  var activeTarget,
      $window = $(window),
      position = {},
      nav = $('body > .topbar li a'),
      targets = nav.map(function () {
        return $(this).attr('href');
      }),
      offsets = $.map(targets, function (id) {
        return $(id).offset().top;
      });


  function setButton(id) {
    nav.parent("li").removeClass('active');
    $(nav[$.inArray(id, targets)]).parent("li").addClass('active');
  }

  function processScroll(e) {
    var scrollTop = $window.scrollTop() + 10, i;
    for (i = offsets.length; i--;) {
      if (activeTarget != targets[i] && scrollTop >= offsets[i] && (!offsets[i + 1] || scrollTop <= offsets[i + 1])) {
        activeTarget = targets[i];
        setButton(activeTarget);
      }
    }
  }

  nav.click(function () {
    processScroll();
  });

  processScroll();

  $window.scroll(processScroll);
});