// http://jquery.com/plugins/project/dimensions
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,
- offsetParent = elem.offsetParent,
+ var parent = elem.parentNode,
+ offsetChild = elem,
+ offsetParent = elem.offsetParent,
doc = elem.ownerDocument,
- safari2 = safari && parseInt(version) < 522;
-
+ safari2 = safari && parseInt(version) < 522 && !/adobeair/i.test(userAgent),
+ css = jQuery.curCSS,
+ fixed = css(elem, "position") == "fixed";
+
// Use getBoundingClientRect if available
- if ( elem.getBoundingClientRect ) {
- box = elem.getBoundingClientRect();
-
+ if ( !(mozilla && elem == document.body) && elem.getBoundingClientRect ) {
+ var box = elem.getBoundingClientRect();
+
// Add the document scroll offsets
- add(
- box.left + Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
- box.top + Math.max(doc.documentElement.scrollTop, doc.body.scrollTop)
- );
-
+ add(box.left + Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
+ box.top + Math.max(doc.documentElement.scrollTop, doc.body.scrollTop));
+
// IE adds the HTML element's border, by default it is medium which is 2px
- // IE 6 and IE 7 quirks mode the border width is overwritable by the following css html { border: 0; }
+ // IE 6 and 7 quirks mode the border width is overwritable by the following css html { border: 0; }
// IE 7 standards mode, the border is always 2px
- if ( msie ) {
- var border = jQuery("html").css("borderWidth");
- border = (border == "medium" || jQuery.boxModel && parseInt(version) >= 7) && 2 || border;
- add( -border, -border );
- }
-
+ // This border/offset is typically represented by the clientLeft and clientTop properties
+ // However, in IE6 and 7 quirks mode the clientLeft and clientTop properties are not updated when overwriting it via CSS
+ // Therefore this method will be off by 2px in IE while in quirksmode
+ add( -doc.documentElement.clientLeft, -doc.documentElement.clientTop );
+
// Otherwise loop through the offsetParents and parentNodes
} else {
-
+
// Initial element offsets
add( elem.offsetLeft, elem.offsetTop );
-
+
// Get parent offsets
while ( offsetParent ) {
// Add offsetParent offsets
add( offsetParent.offsetLeft, offsetParent.offsetTop );
-
+
// 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]$/i.test(parent.tagName) || !safari2 )
+ // However Mozilla adds the border for table or table cells
+ if ( mozilla && !/^t(able|d|h)$/i.test(offsetParent.tagName) || safari && !safari2 )
border( offsetParent );
-
- // Safari <= 2 doubles body offsets with an absolutely positioned element or parent
- if ( safari2 && !absolute && jQuery.css(offsetParent, "position") == "absolute" )
- absolute = true;
-
+
+ // Add the document scroll offsets if position is fixed on any offsetParent
+ if ( !fixed && css(offsetParent, "position") == "fixed" )
+ fixed = true;
+
+ // Set offsetChild to previous offsetParent unless it is the body element
+ offsetChild = /^body$/i.test(offsetParent.tagName) ? offsetChild : offsetParent;
// Get next offsetParent
offsetParent = offsetParent.offsetParent;
}
-
+
// Get parent scroll offsets
- while ( parent.tagName && !/^body|html$/i.test(parent.tagName) ) {
- // Work around opera inline/table scrollLeft/Top bug
- if ( !/^inline|table-row.*$/i.test(jQuery.css(parent, "display")) )
+ while ( parent && parent.tagName && !/^body|html$/i.test(parent.tagName) ) {
+ // Remove parent scroll UNLESS that parent is inline or a table to work around Opera inline/table scrollLeft/Top bug
+ if ( !/^inline|table.*$/i.test(css(parent, "display")) )
// Subtract parent scroll offsets
add( -parent.scrollLeft, -parent.scrollTop );
-
+
// Mozilla does not add the border for a parent that has overflow != visible
- if ( mozilla && jQuery.css(parent, "overflow") != "visible" )
+ if ( mozilla && css(parent, "overflow") != "visible" )
border( parent );
-
+
// Get next parent
parent = parent.parentNode;
}
-
- // Safari doubles body offsets with an absolutely positioned element or parent
- if ( safari2 && absolute )
- add( -doc.body.offsetLeft, -doc.body.offsetTop );
+
+ // Safari <= 2 doubles body offsets with a fixed position element/offsetParent or absolutely positioned offsetChild
+ // Mozilla doubles body offsets with a non-absolutely positioned offsetChild
+ if ( (safari2 && (fixed || css(offsetChild, "position") == "absolute")) ||
+ (mozilla && css(offsetChild, "position") != "absolute") )
+ add( -doc.body.offsetLeft, -doc.body.offsetTop );
+
+ // Add the document scroll offsets if position is fixed
+ if ( fixed )
+ add(Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
+ Math.max(doc.documentElement.scrollTop, doc.body.scrollTop));
}
// Return an object with top and left properties
results = { top: top, left: left };
}
- return results;
-
function border(elem) {
- add( jQuery.css(elem, "borderLeftWidth"), jQuery.css(elem, "borderTopWidth") );
+ add( jQuery.curCSS(elem, "borderLeftWidth", true), jQuery.curCSS(elem, "borderTopWidth", true) );
}
function add(l, t) {
- left += parseInt(l) || 0;
- top += parseInt(t) || 0;
+ left += parseInt(l, 10) || 0;
+ top += parseInt(t, 10) || 0;
}
+
+ return results;
};
+
+
+jQuery.fn.extend({
+ position: function() {
+ var left = 0, top = 0, results;
+
+ if ( this[0] ) {
+ // Get *real* offsetParent
+ var offsetParent = this.offsetParent(),
+
+ // Get correct offsets
+ offset = this.offset(),
+ parentOffset = /^body|html$/i.test(offsetParent[0].tagName) ? { top: 0, left: 0 } : offsetParent.offset();
+
+ // Subtract element margins
+ // note: when an element has margin: auto the offsetLeft and marginLeft
+ // are the same in Safari causing offset.left to incorrectly be 0
+ offset.top -= num( this, 'marginTop' );
+ offset.left -= num( this, 'marginLeft' );
+
+ // Add offsetParent borders
+ parentOffset.top += num( offsetParent, 'borderTopWidth' );
+ parentOffset.left += num( offsetParent, 'borderLeftWidth' );
+
+ // Subtract the two offsets
+ results = {
+ top: offset.top - parentOffset.top,
+ left: offset.left - parentOffset.left
+ };
+ }
+
+ return results;
+ },
+
+ offsetParent: function() {
+ var offsetParent = this[0].offsetParent;
+ while ( offsetParent && (!/^body|html$/i.test(offsetParent.tagName) && jQuery.css(offsetParent, 'position') == 'static') )
+ offsetParent = offsetParent.offsetParent;
+ return jQuery(offsetParent);
+ }
+});
+
+
+// Create scrollLeft and scrollTop methods
+jQuery.each( ['Left', 'Top'], function(i, name) {
+ var method = 'scroll' + name;
+
+ jQuery.fn[ method ] = function(val) {
+ if (!this[0]) return;
+
+ return val != undefined ?
+
+ // Set the scroll offset
+ this.each(function() {
+ this == window || this == document ?
+ window.scrollTo(
+ !i ? val : jQuery(window).scrollLeft(),
+ i ? val : jQuery(window).scrollTop()
+ ) :
+ this[ method ] = val;
+ }) :
+
+ // Return the scroll offset
+ this[0] == window || this[0] == document ?
+ self[ i ? 'pageYOffset' : 'pageXOffset' ] ||
+ jQuery.boxModel && document.documentElement[ method ] ||
+ document.body[ method ] :
+ this[0][ method ];
+ };
+});
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