Detect Scroll Position (Up/Down) using jQuery

Introduction:

Below jQuery code detects whether user is scrolling up or down in the webpage.

Example:

var iScrollPos = 0;

$(window).scroll(function () {
    var iCurScrollPos = $(this).scrollTop();
    if (iCurScrollPos > iScrollPos) {
        //Scrolling Down
    } else {
       //Scrolling Up
    }
    iScrollPos = iCurScrollPos;
});