Efficient Scroll Events

scrollEvent.js

$(document).ready(function() {
	// Fixed sidebar
	var scrolled = false;
	var scrollPos;
	var sidebarPos = $('#sidebar').offset().top;

	$(window).scroll(function() {
		scrolled = true;
	});

	setInterval(function() {
		if (scrolled) {
			scrolled = false;
			scrollPos = $(window).scrollTop();
			if (scrollPos >= sidebarPos) {
				$('#sidebar').addClass('fixed');
				//console.log('Sidebar fixed');
			}
			else {
				$('#sidebar').removeClass('fixed');
				//console.log('Sidebar absolute');
			}
		}
	}, 250);
});