I'm working on a site trying to do this with the navbar, but with bootstrap: link The idea is a transparent navbar, when doing scroll change with an animation. When returning to the starting point, the navbar becomes transparent again. I made a function with jquery, changing the classes when doing scroll with toogleClass but it does not work. How is it done?
window.onscroll = function() {myFunction()};
function myFunction() {
var navbar = document.getElementById("myNavbar");
if (document.body.scrollTop > 100 || document.documentElement.scrollTop > 100) {
navbar.toggleClass("navbar" + "navbar-expand-lg" + "fixed-top" + "nav-white" + "sombreado" + "animate-top");
} else {
navbar.toggleClass("navbar" + "navbar-expand-lg" + "fixed-top" + "nav");
}
}.first > div {
color: #fff;
}
section {
height: 350px;
}
.first {
padding-top: 70px;
/*Imagen*/
background-image: url('https://picsum.photos/1920/1080/?random');
height: auto;
/*Para crear efecto parallax*/
background-attachment: fixed;
background-position: center;
background-repeat: no-repeat;
background-size: cover;
}
.nav {
border: 0;
border-radius: 0;
background: rgba(255, 255, 255, 0.5);
}
.nav-white {
border: 0;
border-radius: 0;
background: rgba(255, 255, 255, 1);
}
.nav-white .navbar-brand {
color: black;
}
.nav-white .navbar-nav li a {
color: black;
}
.nav-white .fa.fa-navicon {
color: black;
}
.sombreado {
box-shadow:0 2px 5px 0 rgba(0,0,0,0.16),0 2px 10px 0 rgba(0,0,0,0.12)
}
.animate-top{
animation:animatetop 0.4s}@keyframes animatetop{from{top:-300px;opacity:0} to{top:0;opacity:1}
}<!DOCTYPE html>
<html lang="es">
<head>
<meta charset="UTF-8">
<title>Transparent Navbar</title>
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
</head>
<body>
<nav class="navbar navbar-expand-lg fixed-top nav" id="myNavbar">
<a href="#" class="navbar-brand">Menu</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar" aria-controls="navbar" aria-expanded="false" aria-label="Menu de Navegacion">
<span class="navbar-toggler-icon">
<i class="fa fa-navicon"></i>
</span>
</button>
<div class="collapse navbar-collapse" id="navbar">
<ul class="navbar-nav mr-auto">
<li class="nav-item">
<a href="#" class="nav-link">TITLE 1</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link">TITLE 2</a>
</li>
<li class="nav-item">
<a href="#" class="nav-link">TITLE 3</a>
</li>
</ul>
</div>
</nav>
<section class="first row">
<div class="col">
<h2>MAIN</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
</section>
<section class="row">
<div class="col">
<h2>TITLE 1</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
</section>
<section class="row">
<div class="col">
<h2>TITLE 2</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
</section>
<section class="row">
<div class="col">
<h2>TITLE 3</h2>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
</div>
</section>
<script src="https://code.jquery.com/jquery-3.3.1.js" integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60=" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" integrity="sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.bundle.min.js" integrity="sha384-zDnhMsjVZfS3hiP7oCBRmfjkQC4fzxVxFhBx8Hkz2aZX8gEvA/jsP3eXRCvzTofP" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
</body>
</html>