Created
May 15, 2010 06:01
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(function() { | |
window.addEventListener('DOMContentLoaded', setScrollBar, false); | |
window.addEventListener('load', setScrollBar, false); | |
function setScrollBar(ev) { | |
window.removeEventListener('DOMContentLoaded', setScrollBar, false); | |
window.removeEventListener('load', setScrollBar, false); | |
var root = document.compatMode === 'BackCompat' ? document.body : document.documentElement; | |
var scrollbar = document.createElement('div'); | |
var sb = scrollbar.style; | |
sb.position = 'fixed'; | |
sb.padding = 0; | |
sb.margin = 0; | |
sb.right = 0; | |
sb.top = 0; | |
sb.width = '10px'; | |
sb.height = '100%'; | |
sb.backgroundColor = 'white'; | |
sb.zIndex = '10000'; | |
sb.opacity = 0; | |
document.body.appendChild(scrollbar); | |
var scroller = document.createElement('div'); | |
var ss = scroller.style; | |
ss.position = 'relative'; | |
ss.marginLeft = '1px'; | |
ss.marginRight = '1px'; | |
ss.borderRadius = '4px'; | |
ss.width = '8px'; | |
ss.backgroundColor = 'black'; | |
scrollbar.appendChild(scroller); | |
var timeout; | |
var interval; | |
var showScrollBar = function() { | |
clearTimeout(timeout); | |
clearInterval(interval); | |
ss.height = Math.max(10, root.clientHeight / root.scrollHeight * root.clientHeight) + 'px'; | |
ss.top = root.scrollTop / root.scrollHeight * root.clientHeight + 'px'; | |
sb.opacity = 0.4; | |
timeout = setTimeout(function() { | |
var steps = 20; | |
interval = setInterval(function() { | |
sb.opacity = (--steps) * 0.02; | |
if (steps <= 0) return clearInterval(interval); | |
}, 25); | |
}, 500); | |
}; | |
if (ev.type === 'load') { | |
showScrollBar(); | |
} else { | |
window.addEventListener('load', showScrollBar, false); | |
} | |
window.addEventListener('scroll', showScrollBar, false); | |
} | |
}()) |
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