How TO - Slide Down a Bar on Scroll
Learn how to slide down a navigation bar on scroll with CSS and JavaScript.
How To Slide Down a Bar
Step 1) Add HTML:
Create a navigation bar:
Example
<div id="navbar">
<a href="#home">Home</a>
<a href="#news">News</a>
<a href="#contact">Contact</a>
</div>
Step 2) Add CSS:
Style the navigation bar:
Example
#navbar {
background-color: #333; /* Black background
color */
position: fixed; /* Make it stick/fixed
*/
top: -50px; /* Hide the navbar 50 px outside of the
top view */
width: 100%; /* Full width */
transition: top 0.3s; /* Transition effect when sliding down (and up) */
}
/* Style the navbar links */
#navbar a {
float: left;
display: block;
color: white;
text-align: center;
padding: 15px;
text-decoration: none;
}
#navbar
a:hover {
background-color: #ddd;
color: black;
}
Step 3) Add JavaScript:
Example
// When the user scrolls down 20px from the top of the document, slide down
the navbar
// When the user scrolls to the top of the page, slide up the
navbar (50px out of the top view)
window.onscroll = function() {scrollFunction()};
function
scrollFunction() {
if (document.body.scrollTop > 20 ||
document.documentElement.scrollTop > 20) {
document.getElementById("navbar").style.top = "0";
} else {
document.getElementById("navbar").style.top = "-50px";
}
}
Try it Yourself »
