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// scroll spy logic
// ================
$(function () {
var activeTarget,
position = {},
$window = $(window),
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);
})
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