new offset method, faster and no more browser detection
This commit is contained in:
Brandon Aaron
parent
b64d60940d
commit
5c21e44fce
169
src/offset.js
169
src/offset.js
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@ -1,101 +1,86 @@
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// The Offset Method
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// Originally By Brandon Aaron, part of the Dimension Plugin
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// http://jquery.com/plugins/project/dimensions
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jQuery.fn.offset = function() {
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var left = 0, top = 0, elem = this[0], results;
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if ( document.documentElement["getBoundingClientRect"] )
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jQuery.fn.offset = function() {
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if ( !this[0] ) return { top: 0, left: 0 };
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if ( this[0] === this[0].ownerDocument.body ) return jQuery.offset.bodyOffset( this[0] );
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var box = this[0].getBoundingClientRect(), doc = this[0].ownerDocument, docElem = doc.documentElement,
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top = box.top + (self.pageYOffset || jQuery.boxModel && docElem.scrollTop || doc.body.scrollTop ) - docElem.clientTop,
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left = box.left + (self.pageXOffset || jQuery.boxModel && docElem.scrollLeft || doc.body.scrollLeft) - docElem.clientLeft;
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return { top: top, left: left };
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};
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else
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jQuery.fn.offset = function() {
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if ( !this[0] ) return { top: 0, left: 0 };
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if ( this[0] === this[0].ownerDocument.body ) return jQuery.offset.bodyOffset( this[0] );
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jQuery.offset.initialized || jQuery.offset.initialize();
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if ( elem ) with ( jQuery.browser ) {
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var parent = elem.parentNode,
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offsetChild = elem,
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offsetParent = elem.offsetParent,
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doc = elem.ownerDocument,
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safari2 = safari && parseInt(version) < 522 && !/adobeair/i.test(userAgent),
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css = jQuery.curCSS,
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fixed = css(elem, "position") == "fixed";
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var elem = this[0], offsetParent = elem.offsetParent, prevOffsetParent = elem,
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doc = elem.ownerDocument, computedStyle, docElem = doc.documentElement,
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body = doc.body, defaultView = doc.defaultView,
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prevComputedStyle = defaultView.getComputedStyle(elem, null),
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top = elem.offsetTop, left = elem.offsetLeft;
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// Use getBoundingClientRect if available
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if ( !(mozilla && elem == document.body) && elem.getBoundingClientRect ) {
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var box = elem.getBoundingClientRect();
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// Add the document scroll offsets
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add(box.left + Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
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box.top + Math.max(doc.documentElement.scrollTop, doc.body.scrollTop));
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// IE adds the HTML element's border, by default it is medium which is 2px
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// IE 6 and 7 quirks mode the border width is overwritable by the following css html { border: 0; }
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// IE 7 standards mode, the border is always 2px
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// This border/offset is typically represented by the clientLeft and clientTop properties
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// However, in IE6 and 7 quirks mode the clientLeft and clientTop properties are not updated when overwriting it via CSS
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// Therefore this method will be off by 2px in IE while in quirksmode
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add( -doc.documentElement.clientLeft, -doc.documentElement.clientTop );
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// Otherwise loop through the offsetParents and parentNodes
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} else {
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// Initial element offsets
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add( elem.offsetLeft, elem.offsetTop );
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// Get parent offsets
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while ( offsetParent ) {
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// Add offsetParent offsets
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add( offsetParent.offsetLeft, offsetParent.offsetTop );
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// Mozilla and Safari > 2 does not include the border on offset parents
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// However Mozilla adds the border for table or table cells
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if ( mozilla && !/^t(able|d|h)$/i.test(offsetParent.tagName) || safari && !safari2 )
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border( offsetParent );
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// Add the document scroll offsets if position is fixed on any offsetParent
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if ( !fixed && css(offsetParent, "position") == "fixed" )
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fixed = true;
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// Set offsetChild to previous offsetParent unless it is the body element
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offsetChild = /^body$/i.test(offsetParent.tagName) ? offsetChild : offsetParent;
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// Get next offsetParent
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offsetParent = offsetParent.offsetParent;
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while ( (elem = elem.parentNode) && elem !== body && elem !== docElem ) {
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computedStyle = defaultView.getComputedStyle(elem, null);
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top -= elem.scrollTop, left -= elem.scrollLeft;
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if ( elem === offsetParent ) {
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top += elem.offsetTop, left += elem.offsetLeft;
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if ( jQuery.offset.doesNotAddBorder && !(jQuery.offset.doesAddBorderForTableAndCells && /^t(able|d|h)$/i.test(elem.tagName)) )
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top += parseInt( computedStyle.borderTopWidth, 10) || 0,
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left += parseInt( computedStyle.borderLeftWidth, 10) || 0;
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prevOffsetParent = offsetParent, offsetParent = elem.offsetParent;
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}
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// Get parent scroll offsets
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while ( parent && parent.tagName && !/^body|html$/i.test(parent.tagName) ) {
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// Remove parent scroll UNLESS that parent is inline or a table to work around Opera inline/table scrollLeft/Top bug
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if ( !/^inline|table.*$/i.test(css(parent, "display")) )
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// Subtract parent scroll offsets
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add( -parent.scrollLeft, -parent.scrollTop );
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// Mozilla does not add the border for a parent that has overflow != visible
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if ( mozilla && css(parent, "overflow") != "visible" )
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border( parent );
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// Get next parent
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parent = parent.parentNode;
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}
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// Safari <= 2 doubles body offsets with a fixed position element/offsetParent or absolutely positioned offsetChild
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// Mozilla doubles body offsets with a non-absolutely positioned offsetChild
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if ( (safari2 && (fixed || css(offsetChild, "position") == "absolute")) ||
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(mozilla && css(offsetChild, "position") != "absolute") )
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add( -doc.body.offsetLeft, -doc.body.offsetTop );
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// Add the document scroll offsets if position is fixed
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if ( fixed )
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add(Math.max(doc.documentElement.scrollLeft, doc.body.scrollLeft),
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Math.max(doc.documentElement.scrollTop, doc.body.scrollTop));
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if ( jQuery.offset.subtractsBorderForOverflowNotVisible && computedStyle.overflow !== "visible" )
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top += parseInt( computedStyle.borderTopWidth, 10) || 0,
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left += parseInt( computedStyle.borderLeftWidth, 10) || 0;
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prevComputedStyle = computedStyle;
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}
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// Return an object with top and left properties
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results = { top: top, left: left };
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}
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if ( prevComputedStyle.position === "relative" || prevComputedStyle.position === "static" )
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top += body.offsetTop,
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left += body.offsetLeft;
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function border(elem) {
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add( jQuery.curCSS(elem, "borderLeftWidth", true), jQuery.curCSS(elem, "borderTopWidth", true) );
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}
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if ( prevComputedStyle.position === "fixed" )
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top += Math.max(docElem.scrollTop, body.scrollTop),
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left += Math.max(docElem.scrollLeft, body.scrollLeft);
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function add(l, t) {
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left += parseInt(l, 10) || 0;
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top += parseInt(t, 10) || 0;
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}
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return { top: top, left: left };
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};
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return results;
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jQuery.offset = {
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initialize: function() {
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if ( this.initialized ) return;
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var body = document.body, container = document.createElement('div'), innerDiv, checkDiv, table, rules, prop, bodyMarginTop = body.style.marginTop,
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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>';
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rules = { position: 'absolute', top: 0, left: 0, margin: 0, border: 0, width: '1px', height: '1px', visibility: 'hidden' }
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for ( prop in rules ) container.style[prop] = rules[prop];
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container.innerHTML = html;
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body.insertBefore(container, body.firstChild);
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innerDiv = container.firstChild, checkDiv = innerDiv.firstChild, td = innerDiv.nextSibling.firstChild.firstChild;
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this.doesNotAddBorder = (checkDiv.offsetTop !== 5);
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this.doesAddBorderForTableAndCells = (td.offsetTop === 5);
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innerDiv.style.overflow = 'hidden', innerDiv.style.position = 'relative';
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this.subtractsBorderForOverflowNotVisible = (checkDiv.offsetTop === -5);
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body.style.marginTop = '1px';
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this.doesNotIncludeMarginInBodyOffset = (body.offsetTop === 0);
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body.style.marginTop = bodyMarginTop;
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body.removeChild(container);
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this.initialized = true;
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},
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bodyOffset: function(body) {
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jQuery.offset.initialized || jQuery.offset.initialize();
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var top = body.offsetTop, left = body.offsetLeft;
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if ( jQuery.offset.doesNotIncludeMarginInBodyOffset )
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top += parseInt( jQuery.curCSS(body, 'marginTop', true), 10 ) || 0,
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left += parseInt( jQuery.curCSS(body, 'marginLeft', true), 10 ) || 0;
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return { top: top, left: left };
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}
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};
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@ -114,11 +99,11 @@ jQuery.fn.extend({
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// Subtract element margins
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// note: when an element has margin: auto the offsetLeft and marginLeft
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// are the same in Safari causing offset.left to incorrectly be 0
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offset.top -= num( this, 'marginTop' );
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offset.top -= num( this, 'marginTop' );
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offset.left -= num( this, 'marginLeft' );
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// Add offsetParent borders
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parentOffset.top += num( offsetParent, 'borderTopWidth' );
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parentOffset.top += num( offsetParent, 'borderTopWidth' );
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parentOffset.left += num( offsetParent, 'borderLeftWidth' );
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// Subtract the two offsets
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24
test/data/offset/body.html
Normal file
24
test/data/offset/body.html
Normal file
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@ -0,0 +1,24 @@
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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<meta http-equiv="Content-type" content="text/html; charset=utf-8">
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<title>body</title>
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<style type="text/css" media="screen">
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body { margin: 1px; padding: 5px; }
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#marker { position: absolute; border: 2px solid #000; width: 50px; height: 50px; background: #ccc; }
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</style>
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<script type="text/javascript" src="../../../dist/jquery.js"></script>
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<script type="text/javascript" charset="utf-8">
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$(function() {
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$('body').click(function() {
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$('#marker').css( $(this).offset() );
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return false;
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});
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});
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</script>
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</head>
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<body>
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<div id="marker"></div>
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</body>
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</html>
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@ -126,10 +126,10 @@ if ( !jQuery.browser.msie || (jQuery.browser.msie && parseInt(jQuery.browser.ver
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var $w = testwin["fixed"].$;
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equals( $w('#fixed-1').offset().top, 1001, "jQuery('#fixed-1').offset().top" );
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equals( $w('#fixed-1').offset().left, jQuery.browser.msie ? 994 : 1001, "jQuery('#fixed-1').offset().left" );
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equals( $w('#fixed-1').offset().left, 1001, "jQuery('#fixed-1').offset().left" );
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equals( $w('#fixed-2').offset().top, 1021, "jQuery('#fixed-2').offset().top" );
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equals( $w('#fixed-2').offset().left, jQuery.browser.msie ? 1014 : 1021, "jQuery('#fixed-2').offset().left" );
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equals( $w('#fixed-2').offset().left, 1021, "jQuery('#fixed-2').offset().left" );
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testwin["fixed"].close();
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});
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@ -161,4 +161,13 @@ testwin("scroll", function() {
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equals( $w('#scroll-1-1').offset().left, 11, "jQuery('#scroll-1-1').offset().left" );
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testwin["scroll"].close();
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});
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testwin("body", function() {
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var $w = testwin["body"].$;
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equals( $w('body').offset().top, 1, "jQuery('#body').offset().top" );
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equals( $w('body').offset().left, 1, "jQuery('#body').offset().left" );
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testwin["body"].close();
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});
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