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offset: added fixed position support and fixed opera issue with borde…

…rs on absolute and relative parents
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brandonaaron committed Sep 21, 2007
1 parent c9899a7 commit 595d1253653c618a8a112ec09777c294125195d9
Showing with 31 additions and 8 deletions.
  1. +31 −8 src/offset.js
@@ -5,11 +5,13 @@ jQuery.fn.offset = function() {
var left = 0, top = 0, elem = this[0], results;

if ( elem ) with ( jQuery.browser ) {
var absolute = jQuery.css(elem, "position") == "absolute",
parent = elem.parentNode,
var parent = elem.parentNode,
offsetParent = elem.offsetParent,
doc = elem.ownerDocument,
safari2 = safari && parseInt(version) < 522;
safari2 = safari && parseInt(version) < 522,
position = jQuery.css(elem, "position"),
absolute = position == "absolute",
fixed = position == "fixed";

// Use getBoundingClientRect if available
if ( elem.getBoundingClientRect ) {
@@ -43,12 +45,26 @@ jQuery.fn.offset = function() {

// Mozilla and Safari > 2 does not include the border on offset parents
// However Mozilla adds the border for table cells
if ( mozilla && !/^t[d|h]$/i.test(offsetParent.tagName) || safari && parseInt(version) >= 522 )
if ( mozilla && /^t[d|h]$/i.test(parent.tagName) || !safari2 )
border( offsetParent );

// Get offsetParent's position
position = jQuery.css(offsetParent, "position");

// Safari <= 2 doubles body offsets with an absolutely positioned element or parent
if ( safari2 && !absolute && jQuery.css(offsetParent, "position") == "absolute" )
if ( safari2 && !absolute && position == "absolute" )
absolute = true;

// Opera adds border for fixed, relative and absolute parent elements
if (opera && /^fixed|relative|absolute$/i.test(position))
add(
-parseInt(jQuery.css(elem, "borderLeftWidth")),
-parseInt(jQuery.css(elem, "borderTopWidth"))
);

// Add the document scroll offsets if position is fixed
if ( !fixed && position == "fixed" )
fixed = true;

// Get next offsetParent
offsetParent = offsetParent.offsetParent;
@@ -69,9 +85,16 @@ jQuery.fn.offset = function() {
parent = parent.parentNode;
}

// Safari doubles body offsets with an absolutely positioned element or parent
if ( safari2 && absolute )
// Safari <= 2 doubles body offsets with an absolute or fixed positioned element or parent
if ( safari2 && (absolute || fixed) )
add( -doc.body.offsetLeft, -doc.body.offsetTop );

// Add the document scroll offsets if position is fixed
if ( fixed )
add(
Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
Math.max(doc.documentElement.scrollTop, doc.body.scrollTop)
);
}

// Return an object with top and left properties
@@ -86,6 +109,6 @@ jQuery.fn.offset = function() {

function add(l, t) {
left += parseInt(l) || 0;
top += parseInt(t) || 0;
top += parseInt(t) || 0;
}
};

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