/
core.js
1252 lines (1000 loc) · 34.3 KB
/
core.js
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var
// Will speed up references to window, and allows munging its name.
window = this,
// Will speed up references to undefined, and allows munging its name.
undefined,
// Map over jQuery in case of overwrite
_jQuery = window.jQuery,
// Map over the $ in case of overwrite
_$ = window.$,
jQuery = window.jQuery = window.$ = function( selector, context ) {
// The jQuery object is actually just the init constructor 'enhanced'
return new jQuery.fn.init( selector, context );
},
// A simple way to check for HTML strings or ID strings
// (both of which we optimize for)
quickExpr = /^[^<]*(<(.|\s)+>)[^>]*$|^#([\w-]+)$/,
// Is it a simple selector
isSimple = /^.[^:#\[\.,]*$/;
jQuery.fn = jQuery.prototype = {
init: function( selector, context ) {
// Make sure that a selection was provided
selector = selector || document;
// Handle $(DOMElement)
if ( selector.nodeType ) {
this[0] = selector;
this.length = 1;
this.context = selector;
return this;
}
// Handle HTML strings
if ( typeof selector === "string" ) {
// Are we dealing with HTML string or an ID?
var match = quickExpr.exec( selector );
// Verify a match, and that no context was specified for #id
if ( match && (match[1] || !context) ) {
// HANDLE: $(html) -> $(array)
if ( match[1] )
selector = jQuery.clean( [ match[1] ], context );
// HANDLE: $("#id")
else {
var elem = document.getElementById( match[3] );
// Handle the case where IE and Opera return items
// by name instead of ID
if ( elem && elem.id != match[3] )
return jQuery().find( selector );
// Otherwise, we inject the element directly into the jQuery object
var ret = jQuery( elem || [] );
ret.context = document;
ret.selector = selector;
return ret;
}
// HANDLE: $(expr, [context])
// (which is just equivalent to: $(content).find(expr)
} else
return jQuery( context ).find( selector );
// HANDLE: $(function)
// Shortcut for document ready
} else if ( jQuery.isFunction( selector ) )
return jQuery( document ).ready( selector );
// Make sure that old selector state is passed along
if ( selector.selector && selector.context ) {
this.selector = selector.selector;
this.context = selector.context;
}
return this.setArray(jQuery.isArray( selector ) ?
selector :
jQuery.makeArray(selector));
},
// Start with an empty selector
selector: "",
// The current version of jQuery being used
jquery: "@VERSION",
// The number of elements contained in the matched element set
size: function() {
return this.length;
},
// Get the Nth element in the matched element set OR
// Get the whole matched element set as a clean array
get: function( num ) {
return num === undefined ?
// Return a 'clean' array
Array.prototype.slice.call( this ) :
// Return just the object
this[ num ];
},
// Take an array of elements and push it onto the stack
// (returning the new matched element set)
pushStack: function( elems, name, selector ) {
// Build a new jQuery matched element set
var ret = jQuery( elems );
// Add the old object onto the stack (as a reference)
ret.prevObject = this;
ret.context = this.context;
if ( name === "find" )
ret.selector = this.selector + (this.selector ? " " : "") + selector;
else if ( name )
ret.selector = this.selector + "." + name + "(" + selector + ")";
// Return the newly-formed element set
return ret;
},
// Force the current matched set of elements to become
// the specified array of elements (destroying the stack in the process)
// You should use pushStack() in order to do this, but maintain the stack
setArray: function( elems ) {
// Resetting the length to 0, then using the native Array push
// is a super-fast way to populate an object with array-like properties
this.length = 0;
Array.prototype.push.apply( this, elems );
return this;
},
// Execute a callback for every element in the matched set.
// (You can seed the arguments with an array of args, but this is
// only used internally.)
each: function( callback, args ) {
return jQuery.each( this, callback, args );
},
// Determine the position of an element within
// the matched set of elements
index: function( elem ) {
// Locate the position of the desired element
return jQuery.inArray(
// If it receives a jQuery object, the first element is used
elem && elem.jquery ? elem[0] : elem
, this );
},
attr: function( name, value, type ) {
var options = name;
// Look for the case where we're accessing a style value
if ( typeof name === "string" )
if ( value === undefined )
return this[0] && jQuery[ type || "attr" ]( this[0], name );
else {
options = {};
options[ name ] = value;
}
// Check to see if we're setting style values
return this.each(function(i){
// Set all the styles
for ( name in options )
jQuery.attr(
type ?
this.style :
this,
name, jQuery.prop( this, options[ name ], type, i, name )
);
});
},
css: function( key, value ) {
// ignore negative width and height values
if ( (key == 'width' || key == 'height') && parseFloat(value) < 0 )
value = undefined;
return this.attr( key, value, "curCSS" );
},
text: function( text ) {
if ( typeof text !== "object" && text != null )
return this.empty().append( (this[0] && this[0].ownerDocument || document).createTextNode( text ) );
var ret = "";
jQuery.each( text || this, function(){
jQuery.each( this.childNodes, function(){
if ( this.nodeType != 8 )
ret += this.nodeType != 1 ?
this.nodeValue :
jQuery.fn.text( [ this ] );
});
});
return ret;
},
wrapAll: function( html ) {
if ( this[0] ) {
// The elements to wrap the target around
var wrap = jQuery( html, this[0].ownerDocument ).clone();
if ( this[0].parentNode )
wrap.insertBefore( this[0] );
wrap.map(function(){
var elem = this;
while ( elem.firstChild )
elem = elem.firstChild;
return elem;
}).append(this);
}
return this;
},
wrapInner: function( html ) {
return this.each(function(){
jQuery( this ).contents().wrapAll( html );
});
},
wrap: function( html ) {
return this.each(function(){
jQuery( this ).wrapAll( html );
});
},
append: function() {
return this.domManip(arguments, true, function(elem){
if (this.nodeType == 1)
this.appendChild( elem );
});
},
prepend: function() {
return this.domManip(arguments, true, function(elem){
if (this.nodeType == 1)
this.insertBefore( elem, this.firstChild );
});
},
before: function() {
return this.domManip(arguments, false, function(elem){
this.parentNode.insertBefore( elem, this );
});
},
after: function() {
return this.domManip(arguments, false, function(elem){
this.parentNode.insertBefore( elem, this.nextSibling );
});
},
end: function() {
return this.prevObject || jQuery( [] );
},
// For internal use only.
// Behaves like an Array's method, not like a jQuery method.
push: [].push,
sort: [].sort,
splice: [].splice,
find: function( selector ) {
if ( this.length === 1 ) {
var ret = this.pushStack( [], "find", selector );
ret.length = 0;
jQuery.find( selector, this[0], ret );
return ret;
} else {
return this.pushStack( jQuery.unique(jQuery.map(this, function(elem){
return jQuery.find( selector, elem );
})), "find", selector );
}
},
clone: function( events ) {
// Do the clone
var ret = this.map(function(){
if ( !jQuery.support.noCloneEvent && !jQuery.isXMLDoc(this) ) {
// IE copies events bound via attachEvent when
// using cloneNode. Calling detachEvent on the
// clone will also remove the events from the orignal
// In order to get around this, we use innerHTML.
// Unfortunately, this means some modifications to
// attributes in IE that are actually only stored
// as properties will not be copied (such as the
// the name attribute on an input).
var html = this.outerHTML;
if ( !html ) {
var div = this.ownerDocument.createElement("div");
div.appendChild( this.cloneNode(true) );
html = div.innerHTML;
}
return jQuery.clean([html.replace(/ jQuery\d+="(?:\d+|null)"/g, "").replace(/^\s*/, "")])[0];
} else
return this.cloneNode(true);
});
// Copy the events from the original to the clone
if ( events === true ) {
var orig = this.find("*").andSelf(), i = 0;
ret.find("*").andSelf().each(function(){
if ( this.nodeName !== orig[i].nodeName )
return;
var events = jQuery.data( orig[i], "events" );
for ( var type in events ) {
for ( var handler in events[ type ] ) {
jQuery.event.add( this, type, events[ type ][ handler ], events[ type ][ handler ].data );
}
}
i++;
});
}
// Return the cloned set
return ret;
},
filter: function( selector ) {
return this.pushStack(
jQuery.isFunction( selector ) &&
jQuery.grep(this, function(elem, i){
return selector.call( elem, i );
}) ||
jQuery.multiFilter( selector, jQuery.grep(this, function(elem){
return elem.nodeType === 1;
}) ), "filter", selector );
},
closest: function( selector ) {
var pos = jQuery.expr.match.POS.test( selector ) ? jQuery(selector) : null,
closer = 0;
return this.map(function(){
var cur = this;
while ( cur && cur.ownerDocument ) {
if ( pos ? pos.index(cur) > -1 : jQuery(cur).is(selector) ) {
jQuery.data(cur, "closest", closer);
return cur;
}
cur = cur.parentNode;
closer++;
}
});
},
not: function( selector ) {
if ( typeof selector === "string" )
// test special case where just one selector is passed in
if ( isSimple.test( selector ) )
return this.pushStack( jQuery.multiFilter( selector, this, true ), "not", selector );
else
selector = jQuery.multiFilter( selector, this );
var isArrayLike = selector.length && selector[selector.length - 1] !== undefined && !selector.nodeType;
return this.filter(function() {
return isArrayLike ? jQuery.inArray( this, selector ) < 0 : this != selector;
});
},
add: function( selector ) {
return this.pushStack( jQuery.unique( jQuery.merge(
this.get(),
typeof selector === "string" ?
jQuery( selector ) :
jQuery.makeArray( selector )
)));
},
is: function( selector ) {
return !!selector && jQuery.multiFilter( selector, this ).length > 0;
},
hasClass: function( selector ) {
return !!selector && this.is( "." + selector );
},
val: function( value ) {
if ( value === undefined ) {
var elem = this[0];
if ( elem ) {
if( jQuery.nodeName( elem, 'option' ) )
return (elem.attributes.value || {}).specified ? elem.value : elem.text;
// We need to handle select boxes special
if ( jQuery.nodeName( elem, "select" ) ) {
var index = elem.selectedIndex,
values = [],
options = elem.options,
one = elem.type == "select-one";
// Nothing was selected
if ( index < 0 )
return null;
// Loop through all the selected options
for ( var i = one ? index : 0, max = one ? index + 1 : options.length; i < max; i++ ) {
var option = options[ i ];
if ( option.selected ) {
// Get the specifc value for the option
value = jQuery(option).val();
// We don't need an array for one selects
if ( one )
return value;
// Multi-Selects return an array
values.push( value );
}
}
return values;
}
// Everything else, we just grab the value
return (elem.value || "").replace(/\r/g, "");
}
return undefined;
}
if ( typeof value === "number" )
value += '';
return this.each(function(){
if ( this.nodeType != 1 )
return;
if ( jQuery.isArray(value) && /radio|checkbox/.test( this.type ) )
this.checked = (jQuery.inArray(this.value, value) >= 0 ||
jQuery.inArray(this.name, value) >= 0);
else if ( jQuery.nodeName( this, "select" ) ) {
var values = jQuery.makeArray(value);
jQuery( "option", this ).each(function(){
this.selected = (jQuery.inArray( this.value, values ) >= 0 ||
jQuery.inArray( this.text, values ) >= 0);
});
if ( !values.length )
this.selectedIndex = -1;
} else
this.value = value;
});
},
html: function( value ) {
return value === undefined ?
(this[0] ?
this[0].innerHTML.replace(/ jQuery\d+="(?:\d+|null)"/g, "") :
null) :
this.empty().append( value );
},
replaceWith: function( value ) {
return this.after( value ).remove();
},
eq: function( i ) {
return this.slice( i, +i + 1 );
},
slice: function() {
return this.pushStack( Array.prototype.slice.apply( this, arguments ),
"slice", Array.prototype.slice.call(arguments).join(",") );
},
map: function( callback ) {
return this.pushStack( jQuery.map(this, function(elem, i){
return callback.call( elem, i, elem );
}));
},
andSelf: function() {
return this.add( this.prevObject );
},
domManip: function( args, table, callback ) {
if ( this[0] ) {
var fragment = (this[0].ownerDocument || this[0]).createDocumentFragment(),
scripts = jQuery.clean( args, (this[0].ownerDocument || this[0]), fragment ),
first = fragment.firstChild,
extra = this.length > 1 ? fragment.cloneNode(true) : fragment;
if ( first )
for ( var i = 0, l = this.length; i < l; i++ )
callback.call( root(this[i], first), i > 0 ? extra.cloneNode(true) : fragment );
if ( scripts )
jQuery.each( scripts, evalScript );
}
return this;
function root( elem, cur ) {
return table && jQuery.nodeName(elem, "table") && jQuery.nodeName(cur, "tr") ?
(elem.getElementsByTagName("tbody")[0] ||
elem.appendChild(elem.ownerDocument.createElement("tbody"))) :
elem;
}
}
};
// Give the init function the jQuery prototype for later instantiation
jQuery.fn.init.prototype = jQuery.fn;
function evalScript( i, elem ) {
if ( elem.src )
jQuery.ajax({
url: elem.src,
async: false,
dataType: "script"
});
else
jQuery.globalEval( elem.text || elem.textContent || elem.innerHTML || "" );
if ( elem.parentNode )
elem.parentNode.removeChild( elem );
}
function now(){
return +new Date;
}
jQuery.extend = jQuery.fn.extend = function() {
// copy reference to target object
var target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, options;
// Handle a deep copy situation
if ( typeof target === "boolean" ) {
deep = target;
target = arguments[1] || {};
// skip the boolean and the target
i = 2;
}
// Handle case when target is a string or something (possible in deep copy)
if ( typeof target !== "object" && !jQuery.isFunction(target) )
target = {};
// extend jQuery itself if only one argument is passed
if ( length == i ) {
target = this;
--i;
}
for ( ; i < length; i++ )
// Only deal with non-null/undefined values
if ( (options = arguments[ i ]) != null )
// Extend the base object
for ( var name in options ) {
var src = target[ name ], copy = options[ name ];
// Prevent never-ending loop
if ( target === copy )
continue;
// Recurse if we're merging object values
if ( deep && copy && typeof copy === "object" && !copy.nodeType )
target[ name ] = jQuery.extend( deep,
// Never move original objects, clone them
src || ( copy.length != null ? [ ] : { } )
, copy );
// Don't bring in undefined values
else if ( copy !== undefined )
target[ name ] = copy;
}
// Return the modified object
return target;
};
// exclude the following css properties to add px
var exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i,
// cache defaultView
defaultView = document.defaultView || {},
toString = Object.prototype.toString;
jQuery.extend({
noConflict: function( deep ) {
window.$ = _$;
if ( deep )
window.jQuery = _jQuery;
return jQuery;
},
// See test/unit/core.js for details concerning isFunction.
// Since version 1.3, DOM methods and functions like alert
// aren't supported. They return false on IE (#2968).
isFunction: function( obj ) {
return toString.call(obj) === "[object Function]";
},
isArray: function( obj ) {
return toString.call(obj) === "[object Array]";
},
// check if an element is in a (or is an) XML document
isXMLDoc: function( elem ) {
return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||
!!elem.ownerDocument && jQuery.isXMLDoc( elem.ownerDocument );
},
// Evalulates a script in a global context
globalEval: function( data ) {
if ( data && /\S/.test(data) ) {
// Inspired by code by Andrea Giammarchi
// http://webreflection.blogspot.com/2007/08/global-scope-evaluation-and-dom.html
var head = document.getElementsByTagName("head")[0] || document.documentElement,
script = document.createElement("script");
script.type = "text/javascript";
if ( jQuery.support.scriptEval )
script.appendChild( document.createTextNode( data ) );
else
script.text = data;
// Use insertBefore instead of appendChild to circumvent an IE6 bug.
// This arises when a base node is used (#2709).
head.insertBefore( script, head.firstChild );
head.removeChild( script );
}
},
nodeName: function( elem, name ) {
return elem.nodeName && elem.nodeName.toUpperCase() == name.toUpperCase();
},
// args is for internal usage only
each: function( object, callback, args ) {
var name, i = 0, length = object.length;
if ( args ) {
if ( length === undefined ) {
for ( name in object )
if ( callback.apply( object[ name ], args ) === false )
break;
} else
for ( ; i < length; )
if ( callback.apply( object[ i++ ], args ) === false )
break;
// A special, fast, case for the most common use of each
} else {
if ( length === undefined ) {
for ( name in object )
if ( callback.call( object[ name ], name, object[ name ] ) === false )
break;
} else
for ( var value = object[0];
i < length && callback.call( value, i, value ) !== false; value = object[++i] ){}
}
return object;
},
prop: function( elem, value, type, i, name ) {
// Handle executable functions
if ( jQuery.isFunction( value ) )
value = value.call( elem, i );
// Handle passing in a number to a CSS property
return typeof value === "number" && type == "curCSS" && !exclude.test( name ) ?
value + "px" :
value;
},
className: {
// internal only, use addClass("class")
add: function( elem, classNames ) {
jQuery.each((classNames || "").split(/\s+/), function(i, className){
if ( elem.nodeType == 1 && !jQuery.className.has( elem.className, className ) )
elem.className += (elem.className ? " " : "") + className;
});
},
// internal only, use removeClass("class")
remove: function( elem, classNames ) {
if (elem.nodeType == 1)
elem.className = classNames !== undefined ?
jQuery.grep(elem.className.split(/\s+/), function(className){
return !jQuery.className.has( classNames, className );
}).join(" ") :
"";
},
// internal only, use hasClass("class")
has: function( elem, className ) {
return elem && jQuery.inArray( className, (elem.className || elem).toString().split(/\s+/) ) > -1;
}
},
// A method for quickly swapping in/out CSS properties to get correct calculations
swap: function( elem, options, callback ) {
var old = {};
// Remember the old values, and insert the new ones
for ( var name in options ) {
old[ name ] = elem.style[ name ];
elem.style[ name ] = options[ name ];
}
callback.call( elem );
// Revert the old values
for ( var name in options )
elem.style[ name ] = old[ name ];
},
css: function( elem, name, force, extra ) {
if ( name == "width" || name == "height" ) {
var val, props = { position: "absolute", visibility: "hidden", display:"block" }, which = name == "width" ? [ "Left", "Right" ] : [ "Top", "Bottom" ];
function getWH() {
val = name == "width" ? elem.offsetWidth : elem.offsetHeight;
if ( extra === "border" )
return;
jQuery.each( which, function() {
if ( !extra )
val -= parseFloat(jQuery.curCSS( elem, "padding" + this, true)) || 0;
if ( extra === "margin" )
val += parseFloat(jQuery.curCSS( elem, "margin" + this, true)) || 0;
else
val -= parseFloat(jQuery.curCSS( elem, "border" + this + "Width", true)) || 0;
});
}
if ( elem.offsetWidth !== 0 )
getWH();
else
jQuery.swap( elem, props, getWH );
return Math.max(0, Math.round(val));
}
return jQuery.curCSS( elem, name, force );
},
curCSS: function( elem, name, force ) {
var ret, style = elem.style;
// We need to handle opacity special in IE
if ( name == "opacity" && !jQuery.support.opacity ) {
ret = jQuery.attr( style, "opacity" );
return ret == "" ?
"1" :
ret;
}
// Make sure we're using the right name for getting the float value
if ( name.match( /float/i ) )
name = styleFloat;
if ( !force && style && style[ name ] )
ret = style[ name ];
else if ( defaultView.getComputedStyle ) {
// Only "float" is needed here
if ( name.match( /float/i ) )
name = "float";
name = name.replace( /([A-Z])/g, "-$1" ).toLowerCase();
var computedStyle = defaultView.getComputedStyle( elem, null );
if ( computedStyle )
ret = computedStyle.getPropertyValue( name );
// We should always get a number back from opacity
if ( name == "opacity" && ret == "" )
ret = "1";
} else if ( elem.currentStyle ) {
var camelCase = name.replace(/\-(\w)/g, function(all, letter){
return letter.toUpperCase();
});
ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
// From the awesome hack by Dean Edwards
// http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
// If we're not dealing with a regular pixel number
// but a number that has a weird ending, we need to convert it to pixels
if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) {
// Remember the original values
var left = style.left, rsLeft = elem.runtimeStyle.left;
// Put in the new values to get a computed value out
elem.runtimeStyle.left = elem.currentStyle.left;
style.left = ret || 0;
ret = style.pixelLeft + "px";
// Revert the changed values
style.left = left;
elem.runtimeStyle.left = rsLeft;
}
}
return ret;
},
clean: function( elems, context, fragment ) {
context = context || document;
// !context.createElement fails in IE with an error but returns typeof 'object'
if ( typeof context.createElement === "undefined" )
context = context.ownerDocument || context[0] && context[0].ownerDocument || document;
// If a single string is passed in and it's a single tag
// just do a createElement and skip the rest
if ( !fragment && elems.length === 1 && typeof elems[0] === "string" ) {
var match = /^<(\w+)\s*\/?>$/.exec(elems[0]);
if ( match )
return [ context.createElement( match[1] ) ];
}
var ret = [], scripts = [], div = context.createElement("div");
jQuery.each(elems, function(i, elem){
if ( typeof elem === "number" )
elem += '';
if ( !elem )
return;
// Convert html string into DOM nodes
if ( typeof elem === "string" ) {
// Fix "XHTML"-style tags in all browsers
elem = elem.replace(/(<(\w+)[^>]*?)\/>/g, function(all, front, tag){
return tag.match(/^(abbr|br|col|img|input|link|meta|param|hr|area|embed)$/i) ?
all :
front + "></" + tag + ">";
});
// Trim whitespace, otherwise indexOf won't work as expected
var tags = elem.replace(/^\s+/, "").substring(0, 10).toLowerCase();
var wrap =
// option or optgroup
!tags.indexOf("<opt") &&
[ 1, "<select multiple='multiple'>", "</select>" ] ||
!tags.indexOf("<leg") &&
[ 1, "<fieldset>", "</fieldset>" ] ||
tags.match(/^<(thead|tbody|tfoot|colg|cap)/) &&
[ 1, "<table>", "</table>" ] ||
!tags.indexOf("<tr") &&
[ 2, "<table><tbody>", "</tbody></table>" ] ||
// <thead> matched above
(!tags.indexOf("<td") || !tags.indexOf("<th")) &&
[ 3, "<table><tbody><tr>", "</tr></tbody></table>" ] ||
!tags.indexOf("<col") &&
[ 2, "<table><tbody></tbody><colgroup>", "</colgroup></table>" ] ||
// IE can't serialize <link> and <script> tags normally
!jQuery.support.htmlSerialize &&
[ 1, "div<div>", "</div>" ] ||
[ 0, "", "" ];
// Go to html and back, then peel off extra wrappers
div.innerHTML = wrap[1] + elem + wrap[2];
// Move to the right depth
while ( wrap[0]-- )
div = div.lastChild;
// Remove IE's autoinserted <tbody> from table fragments
if ( !jQuery.support.tbody ) {
// String was a <table>, *may* have spurious <tbody>
var hasBody = /<tbody/i.test(elem),
tbody = !tags.indexOf("<table") && !hasBody ?
div.firstChild && div.firstChild.childNodes :
// String was a bare <thead> or <tfoot>
wrap[1] == "<table>" && !hasBody ?
div.childNodes :
[];
for ( var j = tbody.length - 1; j >= 0 ; --j )
if ( jQuery.nodeName( tbody[ j ], "tbody" ) && !tbody[ j ].childNodes.length )
tbody[ j ].parentNode.removeChild( tbody[ j ] );
}
// IE completely kills leading whitespace when innerHTML is used
if ( !jQuery.support.leadingWhitespace && /^\s/.test( elem ) )
div.insertBefore( context.createTextNode( elem.match(/^\s*/)[0] ), div.firstChild );
elem = jQuery.makeArray( div.childNodes );
}
if ( elem.nodeType )
ret.push( elem );
else
ret = jQuery.merge( ret, elem );
});
if ( fragment ) {
for ( var i = 0; ret[i]; i++ ) {
if ( jQuery.nodeName( ret[i], "script" ) && (!ret[i].type || ret[i].type.toLowerCase() === "text/javascript") ) {
scripts.push( ret[i].parentNode ? ret[i].parentNode.removeChild( ret[i] ) : ret[i] );
} else {
if ( ret[i].nodeType === 1 )
ret.splice.apply( ret, [i + 1, 0].concat(jQuery.makeArray(ret[i].getElementsByTagName("script"))) );
fragment.appendChild( ret[i] );
}
}
return scripts;
}
return ret;
},
attr: function( elem, name, value ) {
// don't set attributes on text and comment nodes
if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
return undefined;
var notxml = !jQuery.isXMLDoc( elem ),
// Whether we are setting (or getting)
set = value !== undefined;
// Try to normalize/fix the name
name = notxml && jQuery.props[ name ] || name;
// Only do all the following if this is a node (faster for style)
// IE elem.getAttribute passes even for style
if ( elem.tagName ) {
// These attributes require special treatment
var special = /href|src|style/.test( name );
// Safari mis-reports the default selected property of a hidden option
// Accessing the parent's selectedIndex property fixes it
if ( name == "selected" && elem.parentNode )
elem.parentNode.selectedIndex;
// If applicable, access the attribute via the DOM 0 way
if ( name in elem && notxml && !special ) {
if ( set ){
// We can't allow the type property to be changed (since it causes problems in IE)
if ( name == "type" && jQuery.nodeName( elem, "input" ) && elem.parentNode )
throw "type property can't be changed";
elem[ name ] = value;
}
// browsers index elements by id/name on forms, give priority to attributes.
if( jQuery.nodeName( elem, "form" ) && elem.getAttributeNode(name) )
return elem.getAttributeNode( name ).nodeValue;
// elem.tabIndex doesn't always return the correct value when it hasn't been explicitly set
// http://fluidproject.org/blog/2008/01/09/getting-setting-and-removing-tabindex-values-with-javascript/
if ( name == "tabIndex" ) {
var attributeNode = elem.getAttributeNode( "tabIndex" );
return attributeNode && attributeNode.specified
? attributeNode.value
: elem.nodeName.match(/(button|input|object|select|textarea)/i)
? 0
: elem.nodeName.match(/^(a|area)$/i) && elem.href