How can I determine the direction of a jQuery scroll event?

Question

I\'m looking for something to this effect:

$(window).scroll(function(event){
   if (/* magic code*/ ){
       // upscroll code
   } else {
      // downscrol         


        

Answer 1

To ignore any snap / momentum / bounce back at the top and bottom of the page, here is a modified version of Josiah's accepted answer:

var prevScrollTop = 0;
$(window).scroll(function(event){

    var scrollTop = $(this).scrollTop();

    if ( scrollTop < 0 ) {
        scrollTop = 0;
    }
    if ( scrollTop > $('body').height() - $(window).height() ) {
        scrollTop = $('body').height() - $(window).height();
    }

    if (scrollTop >= prevScrollTop && scrollTop) {
        // scrolling down
    } else {
        // scrolling up
    }

    prevScrollTop = scrollTop;
});