SO - 20509886

by Arun P Johny

HTML

<div class="notify"></div>

JavaScript

//Firefox
$('html').on('DOMMouseScroll', function (e) {
    var delta = e.originalEvent.detail;

    if (delta > 0) {

        //alert('You scrolled up');
        $(".notify").append("<p>You scrolled up</p>");

    } else if (delta < 0) {

        //alert('You scrolled down');
        $(".notify").append("<p>You scrolled down</p>");
    }

});

var flag;
//Everything else
$('html').on('mousewheel', function (e) {
    var delta = e.originalEvent.wheelDelta;

    if (flag != 1 && delta < 0) {
        flag = 1;
        //alert('You scrolled down');
        $(".notify").append("<p>You scrolled down</p>");

    } else if (flag != 2 && delta > 0) {
        flag = 2;
        //alert('You scrolled up');
        $(".notify").append("<p>You scrolled up</p>");
    }
});