CSS transition not working when removing class

Question

I want to add a fixed header when I scroll and I would like to add a transition when the class is added/removed. Currently the animation is only working when the class is added.

$(window).scroll(function() {
      var scroll = $(window).scrollTop();

      if (scroll >= 800) {
          $(".nav").addClass("sticky");
      } else {
        $(".nav").removeClass("sticky");
      }
    });

.nav {
  font-weight: 600;
  text-transform: uppercase;
  transition: all 400ms ease;

  &__link {
    text-decoration: none;
    color: white;

    &:not(:last-child) {
      margin-right: 6rem;
    }
  }
}

.sticky {
  position: fixed;
  top: 0;
  left: 0;
  padding: 1rem 0;
  width: 100%;
  z-index: 1;
  text-align: center;
  background: #222;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<nav class="nav">
        <a href="#" class="nav__link">Home</a>
        <a href="#" class="nav__link">About us</a>
        <a href="#" class="nav__link">Menu</a>
        <a href="#" class="nav__link">Drinks</a>
        <a href="#" class="nav__link">Reservations</a>
      </nav>

Its throwing error Uncaught ReferenceError: $ is not defined — Yousaf Hassan
– Yousaf Hassan, Commented Jun 20, 2018 at 4:45
Once you remove the class, you're removing position: fixed - that's why you won't see a transition. — sol
– sol, Commented Jun 20, 2018 at 4:51

Pons Purushothaman · Accepted Answer · 2018-06-20 05:21:24Z

In your css, the properties like position, text-align etc do not support transition.So I moved that properties from css and is now injecting through js with/with out a delay. Also I applied position:absolute for the navigation and aligned it at the top of the body. It normally behaves as a floated block element. May be you have to apply a top margin for the proceeding element to avoid overlap. If that is okay, you may try the below example. <div class="spacer"></div> is a dummy element to make the page scroll-able.

$(window).scroll(function () {
    var scroll = $(window).scrollTop();

    if (scroll >= 800) {
        $(".nav").css({
            'position': 'fixed',
            'text-align': 'center'
        });
        $(".nav").addClass("sticky");
    } else {
        $(".nav").removeClass("sticky");
        setTimeout(function (){
            $(".nav").css({
                'position': 'static',
                'text-align': 'left'
            });
        },400);
    }
});

.nav {
    position:absolute;
    top: 0;
    left: 0;
    width: 100%;
    font-weight: 600;
    text-transform: uppercase;
    transition: all 400ms ease;

    &__link {
        text-decoration: none;
        color: white;

        &:not(:last-child) {
            margin-right: 6rem;
        }
    }
}

.sticky {
    padding: 1rem 0;
    width: 100%;
    z-index: 1;
    text-align: center;
    background: #ccc;
    position: fixed;
}
.spacer{
    width: 100%;
    height: 2000px;
    float: left;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<nav class="nav">
    <a href="#" class="nav__link">Home</a>
    <a href="#" class="nav__link">About us</a>
    <a href="#" class="nav__link">Menu</a>
    <a href="#" class="nav__link">Drinks</a>
    <a href="#" class="nav__link">Reservations</a>
</nav>
<div class="spacer"></div>

Thank you!! This is working for me, now I'll break up the code to understand what's going on here.

Saurabh Mistry · Accepted Answer · 2018-06-20 05:08:14Z

$(document).ready(function() {
            
            if ($('.navbar').length > 0) {
                $(window).on("scroll load resize", function() {
                    checkScroll();
                });
            }
});


function checkScroll() {
            var startY = $('.navbar').height() * 2;
            if ($(window).scrollTop() > startY) {
                $('.navbar').addClass("scrolled");
            } else {
                $('.navbar').removeClass("scrolled");
            }
        }

p{
padding-top:72px;
}

.navbar{
    background: #ffee58;
    font-weight: 600;
    text-transform: uppercase;
    -webkit-transition: all 0.6s ease-out;
    -moz-transition: all 0.6s ease-out;
    -o-transition: all 0.6s ease-out;
    -ms-transition: all 0.6s ease-out;
    transition: all 0.6s ease-out;
}

.navbar.scrolled {
    background: #37474f;
    /* IE */
    box-shadow: 0 4px 2px -2px rgba(0, 0, 0, .2);
    z-index: 999;
    /* NON-IE */
}

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous">

 <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js" integrity="sha384-smHYKdLADwkXOn1EmN1qk/HfnUcbVRZyYmZ4qpPea6sjB/pTJ0euyQp0Mk8ck+5T" crossorigin="anonymous"></script>
    
<header>
<nav class="navbar fixed-top stroke">
        <a href="#" class="nav__link">Home</a>
        <a href="#" class="nav__link">About us</a>
        <a href="#" class="nav__link">Menu</a>
        <a href="#" class="nav__link">Drinks</a>
        <a href="#" class="nav__link">Reservations</a>
</nav>
</header>
<body>
<p>
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<p>
</body>

Hiren Vaghasiya · Accepted Answer · 2018-06-20 04:54:41Z

0

Try adding transition for .sticky class also

.sticky {
  position: fixed;
  top: 0;
  left: 0;
  padding: 1rem 0;
  width: 100%;
  z-index: 1;
  text-align: center;
  background: #222;
 transition: all 400ms ease;
}

edited Jun 20, 2018 at 4:54

Hiren Vaghasiya

5,5341 gold badge13 silver badges25 bronze badges

answered Jun 20, 2018 at 4:49

charan kumar

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1 Comment

Gilbert R. Over a year ago

Yeah I tried that but it doesn't work, I thought it would :/

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