scroll top and down detect

scroll direction.js

var lastScrollTop = 0;
    $(window).scroll(function (event) {
        var st = $(this).scrollTop();
        if (st > lastScrollTop) {
            // downscroll code
            

        } else {
            // upscroll code
            

        }
        lastScrollTop = st;
    });


//Pure js
$('#foo').bind('mousewheel', function(e){
    if(e.originalEvent.wheelDelta /120 > 0) {
        alert('up');
    }
    else{
        alert('down');
    }
});