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(function( jQuery ) {
var getOffset,
rtable = /^t(?:able|d|h)$/i,
rroot = /^(?:body|html)$/i;
if ( "getBoundingClientRect" in document.documentElement ) {
getOffset = function( elem, doc, docElem, box ) {
try {
box = elem.getBoundingClientRect();
} catch(e) {}
// Make sure we're not dealing with a disconnected DOM node
if ( !box || !jQuery.contains( docElem, elem ) ) {
return box ? { top: box.top, left: box.left } : { top: 0, left: 0 };
}
var body = doc.body,
win = getWindow( doc ),
clientTop = docElem.clientTop || body.clientTop || 0,
clientLeft = docElem.clientLeft || body.clientLeft || 0,
scrollTop = win.pageYOffset || jQuery.support.boxModel && docElem.scrollTop || body.scrollTop,
scrollLeft = win.pageXOffset || jQuery.support.boxModel && docElem.scrollLeft || body.scrollLeft,
top = box.top + scrollTop - clientTop,
left = box.left + scrollLeft - clientLeft;
return { top: top, left: left };
};
} else {
getOffset = function( elem, doc, docElem ) {
var computedStyle,
offsetParent = elem.offsetParent,
prevOffsetParent = elem,
body = doc.body,
defaultView = doc.defaultView,
prevComputedStyle = defaultView ? defaultView.getComputedStyle( elem, null ) : elem.currentStyle,
top = elem.offsetTop,
left = elem.offsetLeft;
while ( (elem = elem.parentNode) && elem !== body && elem !== docElem ) {
if ( jQuery.support.fixedPosition && prevComputedStyle.position === "fixed" ) {
break;
}
computedStyle = defaultView ? defaultView.getComputedStyle(elem, null) : elem.currentStyle;
top -= elem.scrollTop;
left -= elem.scrollLeft;
if ( elem === offsetParent ) {
top += elem.offsetTop;
left += elem.offsetLeft;
if ( jQuery.support.doesNotAddBorder && !(jQuery.support.doesAddBorderForTableAndCells && rtable.test(elem.nodeName)) ) {
top += parseFloat( computedStyle.borderTopWidth ) || 0;
left += parseFloat( computedStyle.borderLeftWidth ) || 0;
}
prevOffsetParent = offsetParent;
offsetParent = elem.offsetParent;
}
if ( jQuery.support.subtractsBorderForOverflowNotVisible && computedStyle.overflow !== "visible" ) {
top += parseFloat( computedStyle.borderTopWidth ) || 0;
left += parseFloat( computedStyle.borderLeftWidth ) || 0;
}
prevComputedStyle = computedStyle;
}
if ( prevComputedStyle.position === "relative" || prevComputedStyle.position === "static" ) {
top += body.offsetTop;
left += body.offsetLeft;
}
if ( jQuery.support.fixedPosition && prevComputedStyle.position === "fixed" ) {
top += Math.max( docElem.scrollTop, body.scrollTop );
left += Math.max( docElem.scrollLeft, body.scrollLeft );
}
return { top: top, left: left };
};
}
jQuery.fn.offset = function( options ) {
if ( arguments.length ) {
return options === undefined ?
this :
this.each(function( i ) {
jQuery.offset.setOffset( this, options, i );
});
}
var elem = this[0],
doc = elem && elem.ownerDocument;
if ( !doc ) {
return null;
}
if ( elem === doc.body ) {
return jQuery.offset.bodyOffset( elem );
}
return getOffset( elem, doc, doc.documentElement );
};
jQuery.offset = {
bodyOffset: function( body ) {
var top = body.offsetTop,
left = body.offsetLeft;
if ( jQuery.support.doesNotIncludeMarginInBodyOffset ) {
top += parseFloat( jQuery.css(body, "marginTop") ) || 0;
left += parseFloat( jQuery.css(body, "marginLeft") ) || 0;
}
return { top: top, left: left };
},
setOffset: function( elem, options, i ) {
var position = jQuery.css( elem, "position" );
// set position first, in-case top/left are set even on static elem
if ( position === "static" ) {
elem.style.position = "relative";
}
var curElem = jQuery( elem ),
curOffset = curElem.offset(),
curCSSTop = jQuery.css( elem, "top" ),
curCSSLeft = jQuery.css( elem, "left" ),
calculatePosition = ( position === "absolute" || position === "fixed" ) && jQuery.inArray("auto", [curCSSTop, curCSSLeft]) > -1,
props = {}, curPosition = {}, curTop, curLeft;
// need to be able to calculate position if either top or left is auto and position is either absolute or fixed
if ( calculatePosition ) {
curPosition = curElem.position();
curTop = curPosition.top;
curLeft = curPosition.left;
} else {
curTop = parseFloat( curCSSTop ) || 0;
curLeft = parseFloat( curCSSLeft ) || 0;
}
if ( jQuery.isFunction( options ) ) {
options = options.call( elem, i, curOffset );
}
if ( options.top != null ) {
props.top = ( options.top - curOffset.top ) + curTop;
}
if ( options.left != null ) {
props.left = ( options.left - curOffset.left ) + curLeft;
}
if ( "using" in options ) {
options.using.call( elem, props );
} else {
curElem.css( props );
}
}
};
jQuery.fn.extend({
position: function() {
if ( !this[0] ) {
return null;
}
var elem = this[0],
// Get *real* offsetParent
offsetParent = this.offsetParent(),
// Get correct offsets
offset = this.offset(),
parentOffset = rroot.test(offsetParent[0].nodeName) ? { 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 -= parseFloat( jQuery.css(elem, "marginTop") ) || 0;
offset.left -= parseFloat( jQuery.css(elem, "marginLeft") ) || 0;
// Add offsetParent borders
parentOffset.top += parseFloat( jQuery.css(offsetParent[0], "borderTopWidth") ) || 0;
parentOffset.left += parseFloat( jQuery.css(offsetParent[0], "borderLeftWidth") ) || 0;
// Subtract the two offsets
return {
top: offset.top - parentOffset.top,
left: offset.left - parentOffset.left
};
},
offsetParent: function() {
return this.map(function() {
var offsetParent = this.offsetParent || document.body;
while ( offsetParent && (!rroot.test(offsetParent.nodeName) && jQuery.css(offsetParent, "position") === "static") ) {
offsetParent = offsetParent.offsetParent;
}
return offsetParent;
});
}
});
// Create scrollLeft and scrollTop methods
jQuery.each( {scrollLeft: "pageXOffset", scrollTop: "pageYOffset"}, function( method, prop ) {
var top = /Y/.test( prop );
jQuery.fn[ method ] = function( val ) {
return jQuery.access( this, function( elem, method, val ) {
var win = getWindow( elem );
if ( val === undefined ) {
return win ? (prop in win) ? win[ prop ] :
jQuery.support.boxModel && win.document.documentElement[ method ] ||
win.document.body[ method ] :
elem[ method ];
}
if ( win ) {
win.scrollTo(
!top ? val : jQuery( win ).scrollLeft(),
top ? val : jQuery( win ).scrollTop()
);
} else {
elem[ method ] = val;
}
}, method, val, arguments.length, null );
};
});
function getWindow( elem ) {
return jQuery.isWindow( elem ) ?
elem :
elem.nodeType === 9 ?
elem.defaultView || elem.parentWindow :
false;
}
})( jQuery );
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