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Fix incorrect offset in Element.viewportOffset on IE < 8.

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(cherry picked from commit 3afb0002cbd31726187338c5119657b76111f80c)
This commit is contained in:
Andrew Dupont 2009-11-06 10:58:45 -06:00
parent 62d0430f3b
commit c89d6eac95
1 changed files with 7 additions and 2 deletions
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9
src/dom/layout.js
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@ -751,8 +751,13 @@
Element.addMethods({
viewportOffset: function(element) {
element = $(element);
var rect = element.getBoundingClientRect();
return new Element.Offset(rect.left, rect.top);
var rect = element.getBoundingClientRect(),
docEl = document.documentElement;
// The HTML element on IE < 8 has a 2px border by default, giving
// an incorrect offset. We correct this by subtracting clientTop
// and clientLeft.
return new Element.Offset(rect.top - docEl.clientTop,
rect.left - docEl.clientLeft);
},
cumulativeOffset: function(element) {