scroll_up_down-listener.js

// Event listener for scrolling up or down
// source: http://jsfiddle.net/jquerybyexample/ScQQr/

var iScrollPos = 0;

$(window).scroll(function () {
    var iCurScrollPos = $(this).scrollTop();
    if (iCurScrollPos > iScrollPos) {
        console.log('down');
    } else {
        console.log('up');
    }
    iScrollPos = iCurScrollPos;
});