javascript - Apply Transition effect when adding and remove class

Question

Trying to add sliding transition effect when add and remove class. Tried to this sticky nav js below:

lastScroll = 0;
$(window).on('scroll',function() {    
    var scroll = $(window).scrollTop();
    if(scroll === 0){
        $(".nav").removeClass("darkHeader");
    } else if(lastScroll - scroll > 0) {
        $(".nav").addClass("darkHeader");
    } else {
        $(".nav").removeClass("darkHeader");
    }
    lastScroll = scroll;
});

My Try:

lastScroll = 0;
$(window).on('scroll',function() {    
    var scroll = $(window).scrollTop();
    if(scroll === 0){
        $(".nav").removeClass("darkHeader", 1000, "easeInOutQuad");
    } else if(lastScroll - scroll > 0) {
        $(".nav").addClass("darkHeader", 1000, "easeInOutQuad");
    } else {
        $(".nav").removeClass("darkHeader", 1000, "easeInOutQuad");
    }
    lastScroll = scroll;
});

I'm trying this by adding 1000, "easeInOutQuad" , trying to do this by jquery without CSS3 (no css please).
Problem Fiddle >>

I'm trying to implement slide effect like this >>

Answer 1

Try utilizing jQuery UI , .animate() , .stop() ; adding .css("top", 0) before adding .darkHeader class , adding color: wheat to .darkHeader css

$(function() {

  lastScroll = 0;

  function _scroller() {
    var scroll = $(window).scrollTop();
    if (scroll < 10) {
      $(".nav").stop()
        .animate({
          backgroundColor: "rgb(250, 227, 183)"
        }, {
          duration: 1000,
          easing: "easeInOutQuad"
        })
        .removeClass("darkHeader");
    } else if (lastScroll - scroll > 10) {

      if (!$(".nav").is(":animated")) {
        $(this).off("scroll");
        $(".nav").stop()
          .css("top", -24)
          .animate({
            top: 0,
            backgroundColor: "rgb(0, 0, 0)"
          }, {
            duration: 1000,
            easing: "easeInOutQuad",
            complete: function() {
              $(window).on("scroll.t", function() {
                if ($(window).scrollTop() < 1) {
                  $(this).off("scroll.t")
                  .on("scroll", _scroller).scroll()
                }
              })
            }
          })
          .addClass("darkHeader");
      }
    } else {
      $(".nav").stop()
        .animate({
          backgroundColor: "rgb(243, 221, 180)"
        }, {
          duration: 1000,
          easing: "easeInOutQuad"
        })
        .removeClass("darkHeader");
    }
    lastScroll = scroll;
  }
  $(window).on('scroll', _scroller)

});

body {
  font-family: "Rokkitt", Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 20px;
  background: #f8f8f0;
  margin: 0;
}
.darkHeader {
  /*background-color: black !important; */
  position: fixed;
  color: wheat;
}
.nav {
  width: 100%;
  background-color: wheat;
  padding: 10px;
}
.menu {
  float: right;
  cursor: pointer;
  margin-top: -8px;
}
#content {
  margin-top: 150px;
  padding-top: 20px;
}
.wrap {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 40px;
}
#top span {
  white-space: nowrap;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>
<script src="http://code.jquery.com/ui/1.11.4/jquery-ui.min.js"></script>
<div class="nav">Sticky top navigation bar</div>
<div class="wrap">

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