1 if ( "getBoundingClientRect" in document.documentElement )
2 jQuery.fn.offset = function() {
4 if ( !elem ) return null;
5 if ( elem === elem.ownerDocument.body ) return jQuery.offset.bodyOffset( elem );
6 var box = elem.getBoundingClientRect(), doc = elem.ownerDocument, body = doc.body, docElem = doc.documentElement,
7 clientTop = docElem.clientTop || body.clientTop || 0, clientLeft = docElem.clientLeft || body.clientLeft || 0,
8 top = box.top + (self.pageYOffset || jQuery.boxModel && docElem.scrollTop || body.scrollTop ) - clientTop,
9 left = box.left + (self.pageXOffset || jQuery.boxModel && docElem.scrollLeft || body.scrollLeft) - clientLeft;
10 return { top: top, left: left };
13 jQuery.fn.offset = function() {
15 if ( !elem ) return null;
16 if ( elem === elem.ownerDocument.body ) return jQuery.offset.bodyOffset( elem );
17 jQuery.offset.initialize();
19 var offsetParent = elem.offsetParent, prevOffsetParent = elem,
20 doc = elem.ownerDocument, computedStyle, docElem = doc.documentElement,
21 body = doc.body, defaultView = doc.defaultView,
22 prevComputedStyle = defaultView.getComputedStyle(elem, null),
23 top = elem.offsetTop, left = elem.offsetLeft;
25 while ( (elem = elem.parentNode) && elem !== body && elem !== docElem ) {
26 if ( jQuery.offset.supportsFixedPosition && prevComputedStyle.position === "fixed" ) break;
27 computedStyle = defaultView.getComputedStyle(elem, null);
28 top -= elem.scrollTop, left -= elem.scrollLeft;
29 if ( elem === offsetParent ) {
30 top += elem.offsetTop, left += elem.offsetLeft;
31 if ( jQuery.offset.doesNotAddBorder && !(jQuery.offset.doesAddBorderForTableAndCells && /^t(able|d|h)$/i.test(elem.tagName)) )
32 top += parseFloat( computedStyle.borderTopWidth, 10) || 0,
33 left += parseFloat( computedStyle.borderLeftWidth, 10) || 0;
34 prevOffsetParent = offsetParent, offsetParent = elem.offsetParent;
36 if ( jQuery.offset.subtractsBorderForOverflowNotVisible && computedStyle.overflow !== "visible" )
37 top += parseFloat( computedStyle.borderTopWidth, 10) || 0,
38 left += parseFloat( computedStyle.borderLeftWidth, 10) || 0;
39 prevComputedStyle = computedStyle;
42 if ( prevComputedStyle.position === "relative" || prevComputedStyle.position === "static" )
43 top += body.offsetTop,
44 left += body.offsetLeft;
46 if ( jQuery.offset.supportsFixedPosition && prevComputedStyle.position === "fixed" )
47 top += Math.max(docElem.scrollTop, body.scrollTop),
48 left += Math.max(docElem.scrollLeft, body.scrollLeft);
50 return { top: top, left: left };
54 initialize: function() {
55 var body = document.body, container = document.createElement('div'), innerDiv, checkDiv, table, td, prop, bodyMarginTop = parseFloat(jQuery.curCSS(body, 'marginTop', true), 10) || 0,
56 html = '<div style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;"><div></div></div><table style="position:absolute;top:0;left:0;margin:0;border:5px solid #000;padding:0;width:1px;height:1px;" cellpadding="0" cellspacing="0"><tr><td></td></tr></table>';
58 jQuery.extend( container.style, { position: 'absolute', top: 0, left: 0, margin: 0, border: 0, width: '1px', height: '1px', visibility: 'hidden' } );
60 container.innerHTML = html;
61 body.insertBefore(container, body.firstChild);
62 innerDiv = container.firstChild, checkDiv = innerDiv.firstChild, td = innerDiv.nextSibling.firstChild.firstChild;
64 this.doesNotAddBorder = (checkDiv.offsetTop !== 5);
65 this.doesAddBorderForTableAndCells = (td.offsetTop === 5);
67 checkDiv.style.position = 'fixed', checkDiv.style.top = '20px';
68 this.supportsFixedPosition = (checkDiv.offsetTop >= 15); // safari subtracts parent border width here which is 5px
69 checkDiv.style.position = '', checkDiv.style.top = '';
71 innerDiv.style.overflow = 'hidden', innerDiv.style.position = 'relative';
72 this.subtractsBorderForOverflowNotVisible = (checkDiv.offsetTop === -5);
74 this.doesNotIncludeMarginInBodyOffset = (body.offsetTop !== bodyMarginTop);
76 body.removeChild(container);
77 jQuery.offset.initialize = function(){};
80 bodyOffset: function(body) {
81 jQuery.offset.initialize();
82 var top = body.offsetTop, left = body.offsetLeft;
83 if ( jQuery.offset.doesNotIncludeMarginInBodyOffset )
84 top += parseFloat( jQuery.curCSS(body, 'marginTop', true), 10 ) || 0,
85 left += parseFloat( jQuery.curCSS(body, 'marginLeft', true), 10 ) || 0;
86 return { top: top, left: left };
92 position: function() {
93 if ( !this[0] ) return null;
95 var elem = this[0], left = 0, top = 0, results,
97 // Get *real* offsetParent
98 offsetParent = this.offsetParent(),
100 // Get correct offsets
101 offset = this.offset(),
102 parentOffset = /^body|html$/i.test(offsetParent[0].tagName) ? { top: 0, left: 0 } : offsetParent.offset();
104 // Subtract element margins
105 // note: when an element has margin: auto the offsetLeft and marginLeft
106 // are the same in Safari causing offset.left to incorrectly be 0
107 offset.top -= parseFloat( jQuery.curCSS(elem, 'marginTop', true), 10 ) || 0;
108 offset.left -= parseFloat( jQuery.curCSS(elem, 'marginLeft', true), 10 ) || 0;
110 // Add offsetParent borders
111 parentOffset.top += parseFloat( jQuery.curCSS(offsetParent[0], 'borderTopWidth', true), 10 ) || 0;
112 parentOffset.left += parseFloat( jQuery.curCSS(offsetParent[0], 'borderLeftWidth', true), 10 ) || 0;
114 // Subtract the two offsets
116 top: offset.top - parentOffset.top,
117 left: offset.left - parentOffset.left
123 offsetParent: function() {
124 var offsetParent = this[0].offsetParent || document.body;
125 while ( offsetParent && (!/^body|html$/i.test(offsetParent.tagName) && jQuery.css(offsetParent, 'position') == 'static') )
126 offsetParent = offsetParent.offsetParent;
127 return jQuery(offsetParent);
132 // Create scrollLeft and scrollTop methods
133 jQuery.each( ['Left', 'Top'], function(i, name) {
134 var method = 'scroll' + name;
136 jQuery.fn[ method ] = function(val) {
137 if ( !this[0] ) return null;
139 return val !== undefined ?
141 // Set the scroll offset
142 this.each(function() {
143 this == window || this == document ?
145 !i ? val : jQuery(window).scrollLeft(),
146 i ? val : jQuery(window).scrollTop()
148 this[ method ] = val;
151 // Return the scroll offset
152 this[0] == window || this[0] == document ?
153 self[ i ? 'pageYOffset' : 'pageXOffset' ] ||
154 jQuery.boxModel && document.documentElement[ method ] ||
155 document.body[ method ] :