javascript - Add Class only on browser Scroll Up -


there way add class when scroll browser page.

problem filide>>

js

$(window).scroll(function() {         var scroll = $(window).scrolltop();      if (scroll <= 100) {         $(".nav").addclass("darkheader");     } else {         $(".nav").removeclass("darkheader");     } });

problem js add class when scroll-down page. want add class when scroll browser , after when scroll down class remove.
see example demo>>

if want know whether user has scrolled or down need track of last scroll position. check if new scroll position greater or less position. can set classes accordingly 

// script lastscroll = 0; $(window).on('scroll',function() {         var scroll = $(window).scrolltop();     if(lastscroll - scroll > 0) {         $(".nav").addclass("darkheader");     } else {         $(".nav").removeclass("darkheader");     }     lastscroll = scroll; });

jsfiddle


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