The disappearing back-to-top link was inspired by Brian Cray. Scroll to top links are very useful, but you never know when a user needs to jump back up. Here's a simple to implement "scroll to top" link that only displays after the user begins scrolling.
HTML/XHTML
<body> <div id="top"></div> <!-- put all of your normal <body> stuff here --> <div id="message"><a href="top">Scroll to top</a></div> </body>
CSS
#message a
{
/* display: block before hiding */
display: block;
display: none;
/* link is above all other elements */
z-index: 999;
/* link doesn't hide text behind it */
opacity: .8;
/* link stays at same place on page */
position: fixed;
/* link goes at the bottom of the page */
top: 100%;
margin-top: -80px; /* = height + preferred bottom margin */
/* link is centered */
left: 50%;
margin-left: -160px; /* = half of width */
/* round the corners (to your preference) */
-moz-border-radius: 24px;
-webkit-border-radius: 24px;
/* make it big and easy to see (size, style to preferences) */
width: 300px;
line-height: 48px;
height: 48px;
padding: 10px;
background-color: #000;
font-size: 24px;
text-align: center;
color: #fff;
}
JS - jQuery
$(function () { // run this code on page load (AKA DOM load)
/* set variables locally for increased performance */
var scroll_timer;
var displayed = false;
var $message = $('#message a');
var $window = $(window);
var top = $(document.body).children(0).position().top;
/* react to scroll event on window */
$window.scroll(function () {
window.clearTimeout(scroll_timer);
scroll_timer = window.setTimeout(function () { // use a timer for performance
if($window.scrollTop() <= top) // hide if at the top of the page
{
displayed = false;
$message.fadeOut(500);
}
else if(displayed == false) // show if scrolling down
{
displayed = true;
$message.stop(true, true).show().click(function () { $message.fadeOut(500); });
}
}, 100);
});
});
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