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offset: added fixed position support and fixed opera issue with borders on absolute and relative parents

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This commit is contained in:
Brandon Aaron 2007-09-21 21:41:56 +00:00
parent c9899a74ac
commit 595d125365
1 changed files with 31 additions and 8 deletions
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39
src/offset.js
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@ -5,11 +5,13 @@ jQuery.fn.offset = function() {
var left = 0, top = 0, elem = this[0], results; var left = 0, top = 0, elem = this[0], results;
if ( elem ) with ( jQuery.browser ) { if ( elem ) with ( jQuery.browser ) {
var absolute = jQuery.css(elem, "position") == "absolute", var parent = elem.parentNode,
parent = elem.parentNode,
offsetParent = elem.offsetParent, offsetParent = elem.offsetParent,
doc = elem.ownerDocument, 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 // Use getBoundingClientRect if available
if ( elem.getBoundingClientRect ) { if ( elem.getBoundingClientRect ) {
@ -43,12 +45,26 @@ jQuery.fn.offset = function() {
// Mozilla and Safari > 2 does not include the border on offset parents // Mozilla and Safari > 2 does not include the border on offset parents
// However Mozilla adds the border for table cells // 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 ); border( offsetParent );
// Get offsetParent's position
position = jQuery.css(offsetParent, "position");
// Safari <= 2 doubles body offsets with an absolutely positioned element or parent // 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; 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 // Get next offsetParent
offsetParent = offsetParent.offsetParent; offsetParent = offsetParent.offsetParent;
@ -69,9 +85,16 @@ jQuery.fn.offset = function() {
parent = parent.parentNode; parent = parent.parentNode;
} }
// Safari doubles body offsets with an absolutely positioned element or parent // Safari <= 2 doubles body offsets with an absolute or fixed positioned element or parent
if ( safari2 && absolute ) if ( safari2 && (absolute || fixed) )
add( -doc.body.offsetLeft, -doc.body.offsetTop ); 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 // Return an object with top and left properties
@ -86,6 +109,6 @@ jQuery.fn.offset = function() {
function add(l, t) { function add(l, t) {
left += parseInt(l) || 0; left += parseInt(l) || 0;
top += parseInt(t) || 0; top += parseInt(t) || 0;
} }
}; };