Differentiate between scroll up/down in jquery? [duplicate]

Question

I have found some great ways to check for where the scroll bar is using jquery, but I was wondering if you can differentiate whether or not the user scrolled up or down?

Answer 1

Check for the last state. Something like this:

Keep a variable, say, last_scroll_position, and when you have a scroll, if last_scroll_position - current_position > 0, the user scrolled up, and down if it's less than 0.

Answer 2

<script type='text/javascript'>
$(function(){

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

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

      if (NextScroll > CurrentScroll){
         //write the codes related to down-ward scrolling here
      }
      else {
         //write the codes related to upward-scrolling here
      }

      CurrentScroll = NextScroll;  //Updates current scroll position
  });
});