2 // Originally By Brandon Aaron, part of the Dimension Plugin
3 // http://jquery.com/plugins/project/dimensions
4 jQuery.fn.offset = function() {
5 var left = 0, top = 0, elem = this[0], results;
7 if ( elem ) with ( jQuery.browser ) {
8 var parent = elem.parentNode,
10 offsetParent = elem.offsetParent,
11 doc = elem.ownerDocument,
12 safari2 = safari && parseInt(version) < 522,
13 fixed = jQuery.css(elem, "position") == "fixed";
15 // Use getBoundingClientRect if available
16 if ( elem.getBoundingClientRect ) {
17 var box = elem.getBoundingClientRect();
19 // Add the document scroll offsets
21 box.left + Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
22 box.top + Math.max(doc.documentElement.scrollTop, doc.body.scrollTop)
25 // IE adds the HTML element's border, by default it is medium which is 2px
26 // IE 6 and IE 7 quirks mode the border width is overwritable by the following css html { border: 0; }
27 // IE 7 standards mode, the border is always 2px
29 var border = jQuery("html").css("borderWidth");
30 border = (border == "medium" || jQuery.boxModel && parseInt(version) >= 7) && 2 || border;
31 add( -border, -border );
34 // Otherwise loop through the offsetParents and parentNodes
37 // Initial element offsets
38 add( elem.offsetLeft, elem.offsetTop );
41 while ( offsetParent ) {
42 // Add offsetParent offsets
43 add( offsetParent.offsetLeft, offsetParent.offsetTop );
45 // Mozilla and Safari > 2 does not include the border on offset parents
46 // However Mozilla adds the border for table or table cells
47 if ( mozilla && !/^t(able|d|h)$/i.test(offsetParent.tagName) || safari && !safari2 )
48 border( offsetParent );
50 // Add the document scroll offsets if position is fixed on any offsetParent
51 if ( !fixed && jQuery.css(offsetParent, "position") == "fixed" )
54 // Set offsetChild to previous offsetParent unless it is the body element
55 offsetChild = /^body$/i.test(offsetParent.tagName) ? offsetChild : offsetParent;
56 // Get next offsetParent
57 offsetParent = offsetParent.offsetParent;
60 // Get parent scroll offsets
61 while ( parent.tagName && !/^body|html$/i.test(parent.tagName) ) {
62 // Remove parent scroll UNLESS that parent is inline or a table-row to work around Opera inline/table scrollLeft/Top bug
63 if ( !/^inline|table-row.*$/i.test(jQuery.css(parent, "display")) )
64 // Subtract parent scroll offsets
65 add( -parent.scrollLeft, -parent.scrollTop );
67 // Mozilla does not add the border for a parent that has overflow != visible
68 if ( mozilla && jQuery.css(parent, "overflow") != "visible" )
72 parent = parent.parentNode;
75 // Safari <= 2 doubles body offsets with a fixed position element/offsetParent or absolutely positioned offsetChild
76 // Mozilla doubles body offsets with a non-absolutely positioned offsetChild
77 if ( (safari2 && (fixed || jQuery.css(offsetChild, "position") == "absolute")) ||
78 (mozilla && jQuery.css(offsetChild, "position") != "absoltue") )
79 add( -doc.body.offsetLeft, -doc.body.offsetTop );
81 // Add the document scroll offsets if position is fixed
84 Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
85 Math.max(doc.documentElement.scrollTop, doc.body.scrollTop)
89 // Return an object with top and left properties
90 results = { top: top, left: left };
95 function border(elem) {
96 add( jQuery.css(elem, "borderLeftWidth"), jQuery.css(elem, "borderTopWidth") );
100 left += parseInt(l) || 0;
101 top += parseInt(t) || 0;