Направление прокрутки на странице
(function () {
var previousScroll = 0;
$(window).scroll(function(){
var currentScroll = $(this).scrollTop();
if (currentScroll > previousScroll){
alert('down');
} else {
alert('up');
}
previousScroll = currentScroll;
});
}()); //run this anonymous function immediately
Terrible Tarsier