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Small optimization to offset (thanks Ariel Flesler)

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This commit is contained in:
Brandon Aaron 2008-04-21 22:54:46 +00:00
parent 3e285bd60d
commit 9de35ce3e7
1 changed files with 7 additions and 6 deletions
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13
src/offset.js
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@ -10,7 +10,8 @@ jQuery.fn.offset = function() {
offsetParent = elem.offsetParent, offsetParent = elem.offsetParent,
doc = elem.ownerDocument, doc = elem.ownerDocument,
safari2 = safari && parseInt(version) < 522 && !/adobeair/i.test(userAgent), safari2 = safari && parseInt(version) < 522 && !/adobeair/i.test(userAgent),
fixed = jQuery.css(elem, "position") == "fixed"; css = jQuery.curCSS,
fixed = css(elem, "position") == "fixed";
// Use getBoundingClientRect if available // Use getBoundingClientRect if available
if ( elem.getBoundingClientRect ) { if ( elem.getBoundingClientRect ) {
@ -45,7 +46,7 @@ jQuery.fn.offset = function() {
border( offsetParent ); border( offsetParent );
// Add the document scroll offsets if position is fixed on any offsetParent // Add the document scroll offsets if position is fixed on any offsetParent
if ( !fixed && jQuery.css(offsetParent, "position") == "fixed" ) if ( !fixed && css(offsetParent, "position") == "fixed" )
fixed = true; fixed = true;
// Set offsetChild to previous offsetParent unless it is the body element // Set offsetChild to previous offsetParent unless it is the body element
@ -57,12 +58,12 @@ jQuery.fn.offset = function() {
// Get parent scroll offsets // Get parent scroll offsets
while ( parent && parent.tagName && !/^body|html$/i.test(parent.tagName) ) { while ( parent && parent.tagName && !/^body|html$/i.test(parent.tagName) ) {
// Remove parent scroll UNLESS that parent is inline or a table to work around Opera inline/table scrollLeft/Top bug // Remove parent scroll UNLESS that parent is inline or a table to work around Opera inline/table scrollLeft/Top bug
if ( !/^inline|table.*$/i.test(jQuery.css(parent, "display")) ) if ( !/^inline|table.*$/i.test(css(parent, "display")) )
// Subtract parent scroll offsets // Subtract parent scroll offsets
add( -parent.scrollLeft, -parent.scrollTop ); add( -parent.scrollLeft, -parent.scrollTop );
// Mozilla does not add the border for a parent that has overflow != visible // Mozilla does not add the border for a parent that has overflow != visible
if ( mozilla && jQuery.css(parent, "overflow") != "visible" ) if ( mozilla && css(parent, "overflow") != "visible" )
border( parent ); border( parent );
// Get next parent // Get next parent
@ -71,8 +72,8 @@ jQuery.fn.offset = function() {
// Safari <= 2 doubles body offsets with a fixed position element/offsetParent or absolutely positioned offsetChild // Safari <= 2 doubles body offsets with a fixed position element/offsetParent or absolutely positioned offsetChild
// Mozilla doubles body offsets with a non-absolutely positioned offsetChild // Mozilla doubles body offsets with a non-absolutely positioned offsetChild
if ( (safari2 && (fixed || jQuery.css(offsetChild, "position") == "absolute")) || if ( (safari2 && (fixed || css(offsetChild, "position") == "absolute")) ||
(mozilla && jQuery.css(offsetChild, "position") != "absolute") ) (mozilla && css(offsetChild, "position") != "absolute") )
add( -doc.body.offsetLeft, -doc.body.offsetTop ); add( -doc.body.offsetLeft, -doc.body.offsetTop );
// Add the document scroll offsets if position is fixed // Add the document scroll offsets if position is fixed