src/core.js

   1 /*
   2  * jQuery @VERSION - New Wave Javascript
   3  *
   4  * Copyright (c) 2007 John Resig (jquery.com)
   5  * Dual licensed under the MIT (MIT-LICENSE.txt)
   6  * and GPL (GPL-LICENSE.txt) licenses.
   7  *
   8  * $Date$
   9  * $Rev$
  10  */
  11
  12 // Map over jQuery in case of overwrite
  13 if ( window.jQuery )
  14         var _jQuery = window.jQuery;
  15
  16 var jQuery = window.jQuery = function( selector, context ) {
  17         // The jQuery object is actually just the init constructor 'enhanced'
  18         return new jQuery.prototype.init( selector, context );
  19 };
  20
  21 // Map over the $ in case of overwrite
  22 if ( window.$ )
  23         var _$ = window.$;
  24
  25 // Map the jQuery namespace to the '$' one
  26 window.$ = jQuery;
  27
  28 // A simple way to check for HTML strings or ID strings
  29 // (both of which we optimize for)
  30 var quickExpr = /^[^<]*(<(.|\s)+>)[^>]*$|^#(\w+)$/;
  31
  32 jQuery.fn = jQuery.prototype = {
  33         init: function( selector, context ) {
  34                 // Make sure that a selection was provided
  35                 selector = selector || document;
  36
  37                 // Handle $(DOMElement)
  38                 if ( selector.nodeType ) {
  39                         this[0] = selector;
  40                         this.length = 1;
  41                         return this;
  42
  43                 // Handle HTML strings
  44                 } else if ( typeof selector == "string" ) {
  45                         // Are we dealing with HTML string or an ID?
  46                         var match = quickExpr.exec( selector );
  47
  48                         // Verify a match, and that no context was specified for #id
  49                         if ( match && (match[1] || !context) ) {
  50
  51                                 // HANDLE: $(html) -> $(array)
  52                                 if ( match[1] )
  53                                         selector = jQuery.clean( [ match[1] ], context );
  54
  55                                 // HANDLE: $("#id")
  56                                 else {
  57                                         var elem = document.getElementById( match[3] );
  58
  59                                         // Make sure an element was located
  60                                         if ( elem )
  61                                                 // Handle the case where IE and Opera return items
  62                                                 // by name instead of ID
  63                                                 if ( elem.id != match[3] )
  64                                                         return jQuery().find( selector );
  65
  66                                                 // Otherwise, we inject the element directly into the jQuery object
  67                                                 else {
  68                                                         this[0] = elem;
  69                                                         this.length = 1;
  70                                                         return this;
  71                                                 }
  72
  73                                         else
  74                                                 selector = [];
  75                                 }
  76
  77                         // HANDLE: $(expr, [context])
  78                         // (which is just equivalent to: $(content).find(expr)
  79                         } else
  80                                 return new jQuery( context ).find( selector );
  81
  82                 // HANDLE: $(function)
  83                 // Shortcut for document ready
  84                 } else if ( jQuery.isFunction( selector ) )
  85                         return new jQuery( document )[ jQuery.fn.ready ? "ready" : "load" ]( selector );
  86
  87                 return this.setArray(
  88                         // HANDLE: $(array)
  89                         selector.constructor == Array && selector ||
  90
  91                         // HANDLE: $(arraylike)
  92                         // Watch for when an array-like object, contains DOM nodes, is passed in as the selector
  93                         (selector.jquery || selector.length && selector != window && !selector.nodeType && selector[0] != undefined && selector[0].nodeType) && jQuery.makeArray( selector ) ||
  94
  95                         // HANDLE: $(*)
  96                         [ selector ] );
  97         },
  98
  99         // The current version of jQuery being used
 100         jquery: "@VERSION",
 101
 102         // The number of elements contained in the matched element set
 103         size: function() {
 104                 return this.length;
 105         },
 106
 107         // The number of elements contained in the matched element set
 108         length: 0,
 109
 110         // Get the Nth element in the matched element set OR
 111         // Get the whole matched element set as a clean array
 112         get: function( num ) {
 113                 return num == undefined ?
 114
 115                         // Return a 'clean' array
 116                         jQuery.makeArray( this ) :
 117
 118                         // Return just the object
 119                         this[ num ];
 120         },
 121
 122         // Take an array of elements and push it onto the stack
 123         // (returning the new matched element set)
 124         pushStack: function( elems ) {
 125                 // Build a new jQuery matched element set
 126                 var ret = jQuery( elems );
 127
 128                 // Add the old object onto the stack (as a reference)
 129                 ret.prevObject = this;
 130
 131                 // Return the newly-formed element set
 132                 return ret;
 133         },
 134
 135         // Force the current matched set of elements to become
 136         // the specified array of elements (destroying the stack in the process)
 137         // You should use pushStack() in order to do this, but maintain the stack
 138         setArray: function( elems ) {
 139                 // Resetting the length to 0, then using the native Array push
 140                 // is a super-fast way to populate an object with array-like properties
 141                 this.length = 0;
 142                 Array.prototype.push.apply( this, elems );
 143
 144                 return this;
 145         },
 146
 147         // Execute a callback for every element in the matched set.
 148         // (You can seed the arguments with an array of args, but this is
 149         // only used internally.)
 150         each: function( callback, args ) {
 151                 return jQuery.each( this, callback, args );
 152         },
 153
 154         // Determine the position of an element within
 155         // the matched set of elements
 156         index: function( elem ) {
 157                 var ret = -1;
 158
 159                 // Locate the position of the desired element
 160                 this.each(function(i){
 161                         if ( this == elem )
 162                                 ret = i;
 163                 });
 164
 165                 return ret;
 166         },
 167
 168         attr: function( name, value, type ) {
 169                 var options = name;
 170
 171                 // Look for the case where we're accessing a style value
 172                 if ( name.constructor == String )
 173                         if ( value == undefined )
 174                                 return this.length && jQuery[ type || "attr" ]( this[0], name ) || undefined;
 175
 176                         else {
 177                                 options = {};
 178                                 options[ name ] = value;
 179                         }
 180
 181                 // Check to see if we're setting style values
 182                 return this.each(function(i){
 183                         // Set all the styles
 184                         for ( name in options )
 185                                 jQuery.attr(
 186                                         type ?
 187                                                 this.style :
 188                                                 this,
 189                                         name, jQuery.prop( this, options[ name ], type, i, name )
 190                                 );
 191                 });
 192         },
 193
 194         css: function( key, value ) {
 195                 // ignore negative width and height values
 196                 if ( (key == 'width' || key == 'height') && parseFloat(value) < 0 )
 197                         value = undefined;
 198                 return this.attr( key, value, "curCSS" );
 199         },
 200
 201         text: function( text ) {
 202                 if ( typeof text != "object" && text != null )
 203                         return this.empty().append( (this[0] && this[0].ownerDocument || document).createTextNode( text ) );
 204
 205                 var ret = "";
 206
 207                 jQuery.each( text || this, function(){
 208                         jQuery.each( this.childNodes, function(){
 209                                 if ( this.nodeType != 8 )
 210                                         ret += this.nodeType != 1 ?
 211                                                 this.nodeValue :
 212                                                 jQuery.fn.text( [ this ] );
 213                         });
 214                 });
 215
 216                 return ret;
 217         },
 218
 219         wrapAll: function( html ) {
 220                 if ( this[0] )
 221                         // The elements to wrap the target around
 222                         jQuery( html, this[0].ownerDocument )
 223                                 .clone()
 224                                 .insertBefore( this[0] )
 225                                 .map(function(){
 226                                         var elem = this;
 227
 228                                         while ( elem.firstChild )
 229                                                 elem = elem.firstChild;
 230
 231                                         return elem;
 232                                 })
 233                                 .append(this);
 234
 235                 return this;
 236         },
 237
 238         wrapInner: function( html ) {
 239                 return this.each(function(){
 240                         jQuery( this ).contents().wrapAll( html );
 241                 });
 242         },
 243
 244         wrap: function( html ) {
 245                 return this.each(function(){
 246                         jQuery( this ).wrapAll( html );
 247                 });
 248         },
 249
 250         append: function() {
 251                 return this.domManip(arguments, true, false, function(elem){
 252                         if (this.nodeType == 1)
 253                                 this.appendChild( elem );
 254                 });
 255         },
 256
 257         prepend: function() {
 258                 return this.domManip(arguments, true, true, function(elem){
 259                         if (this.nodeType == 1)
 260                                 this.insertBefore( elem, this.firstChild );
 261                 });
 262         },
 263
 264         before: function() {
 265                 return this.domManip(arguments, false, false, function(elem){
 266                         this.parentNode.insertBefore( elem, this );
 267                 });
 268         },
 269
 270         after: function() {
 271                 return this.domManip(arguments, false, true, function(elem){
 272                         this.parentNode.insertBefore( elem, this.nextSibling );
 273                 });
 274         },
 275
 276         end: function() {
 277                 return this.prevObject || jQuery( [] );
 278         },
 279
 280         find: function( selector ) {
 281                 var elems = jQuery.map(this, function(elem){
 282                         return jQuery.find( selector, elem );
 283                 });
 284
 285                 return this.pushStack( /[^+>] [^+>]/.test( selector ) || selector.indexOf("..") > -1 ?
 286                         jQuery.unique( elems ) :
 287                         elems );
 288         },
 289
 290         clone: function( events ) {
 291                 // Do the clone
 292                 var ret = this.map(function(){
 293                         if ( jQuery.browser.msie && !jQuery.isXMLDoc(this) ) {
 294                                 // IE copies events bound via attachEvent when
 295                                 // using cloneNode. Calling detachEvent on the
 296                                 // clone will also remove the events from the orignal
 297                                 // In order to get around this, we use innerHTML.
 298                                 // Unfortunately, this means some modifications to
 299                                 // attributes in IE that are actually only stored
 300                                 // as properties will not be copied (such as the
 301                                 // the name attribute on an input).
 302                                 var clone = this.cloneNode(true),
 303                                         container = document.createElement("div"),
 304                                         container2 = document.createElement("div");
 305                                 container.appendChild(clone);
 306                                 container2.innerHTML = container.innerHTML;
 307                                 return container2.firstChild;
 308                         } else
 309                                 return this.cloneNode(true);
 310                 });
 311
 312                 // Need to set the expando to null on the cloned set if it exists
 313                 // removeData doesn't work here, IE removes it from the original as well
 314                 // this is primarily for IE but the data expando shouldn't be copied over in any browser
 315                 var clone = ret.find("*").andSelf().each(function(){
 316                         if ( this[ expando ] != undefined )
 317                                 this[ expando ] = null;
 318                 });
 319
 320                 // Copy the events from the original to the clone
 321                 if ( events === true )
 322                         this.find("*").andSelf().each(function(i){
 323                                 var events = jQuery.data( this, "events" );
 324
 325                                 for ( var type in events )
 326                                         for ( var handler in events[ type ] )
 327                                                 jQuery.event.add( clone[ i ], type, events[ type ][ handler ], events[ type ][ handler ].data );
 328                         });
 329
 330                 // Return the cloned set
 331                 return ret;
 332         },
 333
 334         filter: function( selector ) {
 335                 return this.pushStack(
 336                         jQuery.isFunction( selector ) &&
 337                         jQuery.grep(this, function(elem, i){
 338                                 return selector.call( elem, i );
 339                         }) ||
 340
 341                         jQuery.multiFilter( selector, this ) );
 342         },
 343
 344         not: function( selector ) {
 345                 return this.pushStack(
 346                         selector.constructor == String &&
 347                         jQuery.multiFilter( selector, this, true ) ||
 348
 349                         jQuery.grep(this, function(elem) {
 350                                 return selector.constructor == Array || selector.jquery ?
 351                                         jQuery.inArray( elem, selector ) < 0 :
 352                                         elem != selector;
 353                         }) );
 354         },
 355
 356         add: function( selector ) {
 357                 return !selector ? this : this.pushStack( jQuery.merge(
 358                         this.get(),
 359                         selector.constructor == String ?
 360                                 jQuery( selector ).get() :
 361                                 selector.length != undefined && (!selector.nodeName || jQuery.nodeName(selector, "form")) ?
 362                                         selector : [selector] ) );
 363         },
 364
 365         is: function( selector ) {
 366                 return selector ?
 367                         jQuery.multiFilter( selector, this ).length > 0 :
 368                         false;
 369         },
 370
 371         hasClass: function( selector ) {
 372                 return this.is( "." + selector );
 373         },
 374
 375         val: function( value ) {
 376                 if ( value == undefined ) {
 377
 378                         if ( this.length ) {
 379                                 var elem = this[0];
 380
 381                                 // We need to handle select boxes special
 382                                 if ( jQuery.nodeName( elem, "select" ) ) {
 383                                         var index = elem.selectedIndex,
 384                                                 values = [],
 385                                                 options = elem.options,
 386                                                 one = elem.type == "select-one";
 387
 388                                         // Nothing was selected
 389                                         if ( index < 0 )
 390                                                 return null;
 391
 392                                         // Loop through all the selected options
 393                                         for ( var i = one ? index : 0, max = one ? index + 1 : options.length; i < max; i++ ) {
 394                                                 var option = options[ i ];
 395
 396                                                 if ( option.selected ) {
 397                                                         // Get the specifc value for the option
 398                                                         value = jQuery.browser.msie && !option.attributes.value.specified ? option.text : option.value;
 399
 400                                                         // We don't need an array for one selects
 401                                                         if ( one )
 402                                                                 return value;
 403
 404                                                         // Multi-Selects return an array
 405                                                         values.push( value );
 406                                                 }
 407                                         }
 408
 409                                         return values;
 410
 411                                 // Everything else, we just grab the value
 412                                 } else
 413                                         return (this[0].value || "").replace(/\r/g, "");
 414
 415                         }
 416
 417                 } else
 418                         return this.each(function(){
 419                                 if ( this.nodeType != 1 )
 420                                         return;
 421
 422                                 if ( value.constructor == Array && /radio|checkbox/.test( this.type ) )
 423                                         this.checked = (jQuery.inArray(this.value, value) >= 0 ||
 424                                                 jQuery.inArray(this.name, value) >= 0);
 425
 426                                 else if ( jQuery.nodeName( this, "select" ) ) {
 427                                         var values = value.constructor == Array ?
 428                                                 value :
 429                                                 [ value ];
 430
 431                                         jQuery( "option", this ).each(function(){
 432                                                 this.selected = (jQuery.inArray( this.value, values ) >= 0 ||
 433                                                         jQuery.inArray( this.text, values ) >= 0);
 434                                         });
 435
 436                                         if ( !values.length )
 437                                                 this.selectedIndex = -1;
 438
 439                                 } else
 440                                         this.value = value;
 441                         });
 442         },
 443
 444         html: function( value ) {
 445                 return value == undefined ?
 446                         (this.length ?
 447                                 this[0].innerHTML :
 448                                 null) :
 449                         this.empty().append( value );
 450         },
 451
 452         replaceWith: function( value ) {
 453                 return this.after( value ).remove();
 454         },
 455
 456         eq: function( i ) {
 457                 return this.slice( i, i + 1 );
 458         },
 459
 460         slice: function() {
 461                 return this.pushStack( Array.prototype.slice.apply( this, arguments ) );
 462         },
 463
 464         map: function( callback ) {
 465                 return this.pushStack( jQuery.map(this, function(elem, i){
 466                         return callback.call( elem, i, elem );
 467                 }));
 468         },
 469
 470         andSelf: function() {
 471                 return this.add( this.prevObject );
 472         },
 473
 474         domManip: function( args, table, reverse, callback ) {
 475                 var clone = this.length > 1, elems;
 476
 477                 return this.each(function(){
 478                         if ( !elems ) {
 479                                 elems = jQuery.clean( args, this.ownerDocument );
 480
 481                                 if ( reverse )
 482                                         elems.reverse();
 483                         }
 484
 485                         var obj = this;
 486
 487                         if ( table && jQuery.nodeName( this, "table" ) && jQuery.nodeName( elems[0], "tr" ) )
 488                                 obj = this.getElementsByTagName("tbody")[0] || this.appendChild( this.ownerDocument.createElement("tbody") );
 489
 490                         var scripts = jQuery( [] );
 491
 492                         jQuery.each(elems, function(){
 493                                 var elem = clone ?
 494                                         this.cloneNode( true ) :
 495                                         this;
 496
 497                                 // execute all scripts after the elements have been injected
 498                                 if ( jQuery.nodeName( elem, "script" ) ) {
 499                                         scripts = scripts.add( elem );
 500                                 } else {
 501                                         // Remove any inner scripts for later evaluation
 502                                         if ( elem.nodeType == 1 )
 503                                                 scripts = scripts.add( jQuery( "script", elem ).remove() );
 504
 505                                         // Inject the elements into the document
 506                                         callback.call( obj, elem );
 507                                 }
 508                         });
 509
 510                         scripts.each( evalScript );
 511                 });
 512         }
 513 };
 514
 515 // Give the init function the jQuery prototype for later instantiation
 516 jQuery.prototype.init.prototype = jQuery.prototype;
 517
 518 function evalScript( i, elem ) {
 519         if ( elem.src )
 520                 jQuery.ajax({
 521                         url: elem.src,
 522                         async: false,
 523                         dataType: "script"
 524                 });
 525
 526         else
 527                 jQuery.globalEval( elem.text || elem.textContent || elem.innerHTML || "" );
 528
 529         if ( elem.parentNode )
 530                 elem.parentNode.removeChild( elem );
 531 }
 532
 533 jQuery.extend = jQuery.fn.extend = function() {
 534         // copy reference to target object
 535         var target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, options;
 536
 537         // Handle a deep copy situation
 538         if ( target.constructor == Boolean ) {
 539                 deep = target;
 540                 target = arguments[1] || {};
 541                 // skip the boolean and the target
 542                 i = 2;
 543         }
 544
 545         // Handle case when target is a string or something (possible in deep copy)
 546         if ( typeof target != "object" && typeof target != "function" )
 547                 target = {};
 548
 549         // extend jQuery itself if only one argument is passed
 550         if ( length == 1 ) {
 551                 target = this;
 552                 i = 0;
 553         }
 554
 555         for ( ; i < length; i++ )
 556                 // Only deal with non-null/undefined values
 557                 if ( (options = arguments[ i ]) != null )
 558                         // Extend the base object
 559                         for ( var name in options ) {
 560                                 // Prevent never-ending loop
 561                                 if ( target === options[ name ] )
 562                                         continue;
 563
 564                                 // Recurse if we're merging object values
 565                                 if ( deep && options[ name ] && typeof options[ name ] == "object" && target[ name ] && !options[ name ].nodeType )
 566                                         target[ name ] = jQuery.extend( target[ name ], options[ name ] );
 567
 568                                 // Don't bring in undefined values
 569                                 else if ( options[ name ] != undefined )
 570                                         target[ name ] = options[ name ];
 571
 572                         }
 573
 574         // Return the modified object
 575         return target;
 576 };
 577
 578 var expando = "jQuery" + (new Date()).getTime(), uuid = 0, windowData = {};
 579
 580 // exclude the following css properties to add px
 581 var exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i;
 582
 583 jQuery.extend({
 584         noConflict: function( deep ) {
 585                 window.$ = _$;
 586
 587                 if ( deep )
 588                         window.jQuery = _jQuery;
 589
 590                 return jQuery;
 591         },
 592
 593         // This may seem like some crazy code, but trust me when I say that this
 594         // is the only cross-browser way to do this. --John
 595         isFunction: function( fn ) {
 596                 return !!fn && typeof fn != "string" && !fn.nodeName &&
 597                         fn.constructor != Array && /function/i.test( fn + "" );
 598         },
 599
 600         // check if an element is in a (or is an) XML document
 601         isXMLDoc: function( elem ) {
 602                 return elem.documentElement && !elem.body ||
 603                         elem.tagName && elem.ownerDocument && !elem.ownerDocument.body;
 604         },
 605
 606         // Evalulates a script in a global context
 607         globalEval: function( data ) {
 608                 data = jQuery.trim( data );
 609
 610                 if ( data ) {
 611                         // Inspired by code by Andrea Giammarchi
 612                         // http://webreflection.blogspot.com/2007/08/global-scope-evaluation-and-dom.html
 613                         var head = document.getElementsByTagName("head")[0] || document.documentElement,
 614                                 script = document.createElement("script");
 615
 616                         script.type = "text/javascript";
 617                         if ( jQuery.browser.msie )
 618                                 script.text = data;
 619                         else
 620                                 script.appendChild( document.createTextNode( data ) );
 621
 622                         head.appendChild( script );
 623                         head.removeChild( script );
 624                 }
 625         },
 626
 627         nodeName: function( elem, name ) {
 628                 return elem.nodeName && elem.nodeName.toUpperCase() == name.toUpperCase();
 629         },
 630
 631         cache: {},
 632
 633         data: function( elem, name, data ) {
 634                 elem = elem == window ?
 635                         windowData :
 636                         elem;
 637
 638                 var id = elem[ expando ];
 639
 640                 // Compute a unique ID for the element
 641                 if ( !id )
 642                         id = elem[ expando ] = ++uuid;
 643
 644                 // Only generate the data cache if we're
 645                 // trying to access or manipulate it
 646                 if ( name && !jQuery.cache[ id ] )
 647                         jQuery.cache[ id ] = {};
 648
 649                 // Prevent overriding the named cache with undefined values
 650                 if ( data != undefined )
 651                         jQuery.cache[ id ][ name ] = data;
 652
 653                 // Return the named cache data, or the ID for the element
 654                 return name ?
 655                         jQuery.cache[ id ][ name ] :
 656                         id;
 657         },
 658
 659         removeData: function( elem, name ) {
 660                 elem = elem == window ?
 661                         windowData :
 662                         elem;
 663
 664                 var id = elem[ expando ];
 665
 666                 // If we want to remove a specific section of the element's data
 667                 if ( name ) {
 668                         if ( jQuery.cache[ id ] ) {
 669                                 // Remove the section of cache data
 670                                 delete jQuery.cache[ id ][ name ];
 671
 672                                 // If we've removed all the data, remove the element's cache
 673                                 name = "";
 674
 675                                 for ( name in jQuery.cache[ id ] )
 676                                         break;
 677
 678                                 if ( !name )
 679                                         jQuery.removeData( elem );
 680                         }
 681
 682                 // Otherwise, we want to remove all of the element's data
 683                 } else {
 684                         // Clean up the element expando
 685                         try {
 686                                 delete elem[ expando ];
 687                         } catch(e){
 688                                 // IE has trouble directly removing the expando
 689                                 // but it's ok with using removeAttribute
 690                                 if ( elem.removeAttribute )
 691                                         elem.removeAttribute( expando );
 692                         }
 693
 694                         // Completely remove the data cache
 695                         delete jQuery.cache[ id ];
 696                 }
 697         },
 698
 699         // args is for internal usage only
 700         each: function( object, callback, args ) {
 701                 if ( args ) {
 702                         if ( object.length == undefined )
 703                                 for ( var name in object )
 704                                         callback.apply( object[ name ], args );
 705                         else
 706                                 for ( var i = 0, length = object.length; i < length; i++ )
 707                                         if ( callback.apply( object[ i ], args ) === false )
 708                                                 break;
 709
 710                 // A special, fast, case for the most common use of each
 711                 } else {
 712                         if ( object.length == undefined )
 713                                 for ( var name in object )
 714                                         callback.call( object[ name ], name, object[ name ] );
 715                         else
 716                                 for ( var i = 0, length = object.length, value = object[0];
 717                                         i < length && callback.call( value, i, value ) !== false; value = object[++i] ){}
 718                 }
 719
 720                 return object;
 721         },
 722
 723         prop: function( elem, value, type, i, name ) {
 724                         // Handle executable functions
 725                         if ( jQuery.isFunction( value ) )
 726                                 value = value.call( elem, i );
 727
 728                         // Handle passing in a number to a CSS property
 729                         return value && value.constructor == Number && type == "curCSS" && !exclude.test( name ) ?
 730                                 value + "px" :
 731                                 value;
 732         },
 733
 734         className: {
 735                 // internal only, use addClass("class")
 736                 add: function( elem, classNames ) {
 737                         jQuery.each((classNames || "").split(/\s+/), function(i, className){
 738                                 if ( elem.nodeType == 1 && !jQuery.className.has( elem.className, className ) )
 739                                         elem.className += (elem.className ? " " : "") + className;
 740                         });
 741                 },
 742
 743                 // internal only, use removeClass("class")
 744                 remove: function( elem, classNames ) {
 745                         if (elem.nodeType == 1)
 746                                 elem.className = classNames != undefined ?
 747                                         jQuery.grep(elem.className.split(/\s+/), function(className){
 748                                                 return !jQuery.className.has( classNames, className );
 749                                         }).join(" ") :
 750                                         "";
 751                 },
 752
 753                 // internal only, use is(".class")
 754                 has: function( elem, className ) {
 755                         return jQuery.inArray( className, (elem.className || elem).toString().split(/\s+/) ) > -1;
 756                 }
 757         },
 758
 759         // A method for quickly swapping in/out CSS properties to get correct calculations
 760         swap: function( elem, options, callback ) {
 761                 // Remember the old values, and insert the new ones
 762                 for ( var name in options ) {
 763                         elem.style[ "old" + name ] = elem.style[ name ];
 764                         elem.style[ name ] = options[ name ];
 765                 }
 766
 767                 callback.call( elem );
 768
 769                 // Revert the old values
 770                 for ( var name in options )
 771                         elem.style[ name ] = elem.style[ "old" + name ];
 772         },
 773
 774         css: function( elem, name, force ) {
 775                 if ( name == "width" || name == "height" ) {
 776                         var width, height, props = { position: "absolute", visibility: "hidden", display:"block" };
 777
 778                         function getWH() {
 779                                 width = elem.clientWidth;
 780                                 height = elem.clientHeight;
 781                         }
 782
 783                         if ( jQuery(elem).is(":visible") )
 784                                 getWH();
 785                         else
 786                                 jQuery.swap( elem, props, getWH );
 787
 788                         return name == "width" ? width : height;
 789                 }
 790
 791                 return jQuery.curCSS( elem, name, force );
 792         },
 793
 794         curCSS: function( elem, name, force ) {
 795                 var ret;
 796
 797                 // A helper method for determining if an element's values are broken
 798                 function color( elem ) {
 799                         if ( !jQuery.browser.safari )
 800                                 return false;
 801
 802                         var ret = document.defaultView.getComputedStyle( elem, null );
 803                         return !ret || ret.getPropertyValue("color") == "";
 804                 }
 805
 806                 // We need to handle opacity special in IE
 807                 if ( name == "opacity" && jQuery.browser.msie ) {
 808                         ret = jQuery.attr( elem.style, "opacity" );
 809
 810                         return ret == "" ?
 811                                 "1" :
 812                                 ret;
 813                 }
 814
 815                 // Make sure we're using the right name for getting the float value
 816                 if ( name.match( /float/i ) )
 817                         name = styleFloat;
 818
 819                 if ( !force && elem.style[ name ] )
 820                         ret = elem.style[ name ];
 821
 822                 else if ( document.defaultView && document.defaultView.getComputedStyle ) {
 823
 824                         // Only "float" is needed here
 825                         if ( name.match( /float/i ) )
 826                                 name = "float";
 827
 828                         name = name.replace( /([A-Z])/g, "-$1" ).toLowerCase();
 829
 830                         var getComputedStyle = document.defaultView.getComputedStyle( elem, null );
 831
 832                         if ( getComputedStyle && !color( elem ) )
 833                                 ret = getComputedStyle.getPropertyValue( name );
 834
 835                         // If the element isn't reporting its values properly in Safari
 836                         // then some display: none elements are involved
 837                         else {
 838                                 var swap = [], stack = [];
 839
 840                                 // Locate all of the parent display: none elements
 841                                 for ( var a = elem; a && color(a); a = a.parentNode )
 842                                         stack.unshift(a);
 843
 844                                 // Go through and make them visible, but in reverse
 845                                 // (It would be better if we knew the exact display type that they had)
 846                                 for ( var i = 0; i < stack.length; i++ )
 847                                         if ( color( stack[ i ] ) ) {
 848                                                 swap[ i ] = stack[ i ].style.display;
 849                                                 stack[ i ].style.display = "block";
 850                                         }
 851
 852                                 // Since we flip the display style, we have to handle that
 853                                 // one special, otherwise get the value
 854                                 ret = name == "display" && swap[ stack.length - 1 ] != null ?
 855                                         "none" :
 856                                         ( getComputedStyle && getComputedStyle.getPropertyValue( name ) ) || "";
 857
 858                                 // Finally, revert the display styles back
 859                                 for ( var i = 0; i < swap.length; i++ )
 860                                         if ( swap[ i ] != null )
 861                                                 stack[ i ].style.display = swap[ i ];
 862                         }
 863
 864                         // We should always get a number back from opacity
 865                         if ( name == "opacity" && ret == "" )
 866                                 ret = "1";
 867
 868                 } else if ( elem.currentStyle ) {
 869                         var camelCase = name.replace(/\-(\w)/g, function(all, letter){
 870                                 return letter.toUpperCase();
 871                         });
 872
 873                         ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
 874
 875                         // From the awesome hack by Dean Edwards
 876                         // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 877
 878                         // If we're not dealing with a regular pixel number
 879                         // but a number that has a weird ending, we need to convert it to pixels
 880                         if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) {
 881                                 // Remember the original values
 882                                 var style = elem.style.left, runtimeStyle = elem.runtimeStyle.left;
 883
 884                                 // Put in the new values to get a computed value out
 885                                 elem.runtimeStyle.left = elem.currentStyle.left;
 886                                 elem.style.left = ret || 0;
 887                                 ret = elem.style.pixelLeft + "px";
 888
 889                                 // Revert the changed values
 890                                 elem.style.left = style;
 891                                 elem.runtimeStyle.left = runtimeStyle;
 892                         }
 893                 }
 894
 895                 return ret;
 896         },
 897
 898         clean: function( elems, context ) {
 899                 var ret = [];
 900                 context = context || document;
 901                 // !context.createElement fails in IE with an error but returns typeof 'object'
 902                 if (typeof context.createElement == 'undefined')
 903                         context = context.ownerDocument || context[0] && context[0].ownerDocument || document;
 904
 905                 jQuery.each(elems, function(i, elem){
 906                         if ( !elem )
 907                                 return;
 908
 909                         if ( elem.constructor == Number )
 910                                 elem = elem.toString();
 911
 912                         // Convert html string into DOM nodes
 913                         if ( typeof elem == "string" ) {
 914                                 // Fix "XHTML"-style tags in all browsers
 915                                 elem = elem.replace(/(<(\w+)[^>]*?)\/>/g, function(all, front, tag){
 916                                         return tag.match(/^(abbr|br|col|img|input|link|meta|param|hr|area)$/i) ?
 917                                                 all :
 918                                                 front + "></" + tag + ">";
 919                                 });
 920
 921                                 // Trim whitespace, otherwise indexOf won't work as expected
 922                                 var tags = jQuery.trim( elem ).toLowerCase(), div = context.createElement("div");
 923
 924                                 var wrap =
 925                                         // option or optgroup
 926                                         !tags.indexOf("<opt") &&
 927                                         [ 1, "<select multiple='multiple'>", "</select>" ] ||
 928
 929                                         !tags.indexOf("<leg") &&
 930                                         [ 1, "<fieldset>", "</fieldset>" ] ||
 931
 932                                         tags.match(/^<(thead|tbody|tfoot|colg|cap)/) &&
 933                                         [ 1, "<table>", "</table>" ] ||
 934
 935                                         !tags.indexOf("<tr") &&
 936                                         [ 2, "<table><tbody>", "</tbody></table>" ] ||
 937
 938                                         // <thead> matched above
 939                                         (!tags.indexOf("<td") || !tags.indexOf("<th")) &&
 940                                         [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ] ||
 941
 942                                         !tags.indexOf("<col") &&
 943                                         [ 2, "<table><tbody></tbody><colgroup>", "</colgroup></table>" ] ||
 944
 945                                         // IE can't serialize <link> and <script> tags normally
 946                                         jQuery.browser.msie &&
 947                                         [ 1, "div<div>", "</div>" ] ||
 948
 949                                         [ 0, "", "" ];
 950
 951                                 // Go to html and back, then peel off extra wrappers
 952                                 div.innerHTML = wrap[1] + elem + wrap[2];
 953
 954                                 // Move to the right depth
 955                                 while ( wrap[0]-- )
 956                                         div = div.lastChild;
 957
 958                                 // Remove IE's autoinserted <tbody> from table fragments
 959                                 if ( jQuery.browser.msie ) {
 960
 961                                         // String was a <table>, *may* have spurious <tbody>
 962                                         var tbody = !tags.indexOf("<table") && tags.indexOf("<tbody") < 0 ?
 963                                                 div.firstChild && div.firstChild.childNodes :
 964
 965                                                 // String was a bare <thead> or <tfoot>
 966                                                 wrap[1] == "<table>" && tags.indexOf("<tbody") < 0 ?
 967                                                         div.childNodes :
 968                                                         [];
 969
 970                                         for ( var i = tbody.length - 1; i >= 0 ; --i )
 971                                                 if ( jQuery.nodeName( tbody[ i ], "tbody" ) && !tbody[ i ].childNodes.length )
 972                                                         tbody[ i ].parentNode.removeChild( tbody[ i ] );
 973
 974                                         // IE completely kills leading whitespace when innerHTML is used
 975                                         if ( /^\s/.test( elem ) )
 976                                                 div.insertBefore( context.createTextNode( elem.match(/^\s*/)[0] ), div.firstChild );
 977
 978                                 }
 979
 980                                 elem = jQuery.makeArray( div.childNodes );
 981                         }
 982
 983                         if ( elem.length === 0 && (!jQuery.nodeName( elem, "form" ) && !jQuery.nodeName( elem, "select" )) )
 984                                 return;
 985
 986                         if ( elem[0] == undefined || jQuery.nodeName( elem, "form" ) || elem.options )
 987                                 ret.push( elem );
 988
 989                         else
 990                                 ret = jQuery.merge( ret, elem );
 991
 992                 });
 993
 994                 return ret;
 995         },
 996
 997         attr: function( elem, name, value ) {
 998                 // don't set attributes on text and comment nodes
 999                 if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
1000                         return undefined;
1001
1002                 var fix = jQuery.isXMLDoc( elem ) ?
1003                         {} :
1004                         jQuery.props;
1005
1006                 // Safari mis-reports the default selected property of a hidden option
1007                 // Accessing the parent's selectedIndex property fixes it
1008                 if ( name == "selected" && jQuery.browser.safari )
1009                         elem.parentNode.selectedIndex;
1010
1011                 // Certain attributes only work when accessed via the old DOM 0 way
1012                 if ( fix[ name ] ) {
1013                         if ( value != undefined )
1014                                 elem[ fix[ name ] ] = value;
1015
1016                         return elem[ fix[ name ] ];
1017
1018                 } else if ( jQuery.browser.msie && name == "style" )
1019                         return jQuery.attr( elem.style, "cssText", value );
1020
1021                 else if ( value == undefined && jQuery.browser.msie && jQuery.nodeName( elem, "form" ) && (name == "action" || name == "method") )
1022                         return elem.getAttributeNode( name ).nodeValue;
1023
1024                 // IE elem.getAttribute passes even for style
1025                 else if ( elem.tagName ) {
1026
1027                         if ( value != undefined ) {
1028                                 // We can't allow the type property to be changed (since it causes problems in IE)
1029                                 if ( name == "type" && jQuery.nodeName( elem, "input" ) && elem.parentNode )
1030                                         throw "type property can't be changed";
1031
1032                                 // convert the value to a string (all browsers do this but IE) see #1070
1033                                 elem.setAttribute( name, "" + value );
1034                         }
1035
1036                         if ( jQuery.browser.msie && /href|src/.test( name ) && !jQuery.isXMLDoc( elem ) )
1037                                 return elem.getAttribute( name, 2 );
1038
1039                         return elem.getAttribute( name );
1040
1041                 // elem is actually elem.style ... set the style
1042                 } else {
1043                         // IE actually uses filters for opacity
1044                         if ( name == "opacity" && jQuery.browser.msie ) {
1045                                 if ( value != undefined ) {
1046                                         // IE has trouble with opacity if it does not have layout
1047                                         // Force it by setting the zoom level
1048                                         elem.zoom = 1;
1049
1050                                         // Set the alpha filter to set the opacity
1051                                         elem.filter = (elem.filter || "").replace( /alpha\([^)]*\)/, "" ) +
1052                                                 (parseFloat( value ).toString() == "NaN" ? "" : "alpha(opacity=" + value * 100 + ")");
1053                                 }
1054
1055                                 return elem.filter && elem.filter.indexOf("opacity=") >= 0 ?
1056                                         (parseFloat( elem.filter.match(/opacity=([^)]*)/)[1] ) / 100).toString() :
1057                                         "";
1058                         }
1059
1060                         name = name.replace(/-([a-z])/ig, function(all, letter){
1061                                 return letter.toUpperCase();
1062                         });
1063
1064                         if ( value != undefined )
1065                                 elem[ name ] = value;
1066
1067                         return elem[ name ];
1068                 }
1069         },
1070
1071         trim: function( text ) {
1072                 return (text || "").replace( /^\s+|\s+$/g, "" );
1073         },
1074
1075         makeArray: function( array ) {
1076                 var ret = [];
1077
1078                 // Need to use typeof to fight Safari childNodes crashes
1079                 if ( typeof array != "array" )
1080                         for ( var i = 0, length = array.length; i < length; i++ )
1081                                 ret.push( array[ i ] );
1082                 else
1083                         ret = array.slice( 0 );
1084
1085                 return ret;
1086         },
1087
1088         inArray: function( elem, array ) {
1089                 for ( var i = 0, length = array.length; i < length; i++ )
1090                         if ( array[ i ] == elem )
1091                                 return i;
1092
1093                 return -1;
1094         },
1095
1096         merge: function( first, second ) {
1097                 // We have to loop this way because IE & Opera overwrite the length
1098                 // expando of getElementsByTagName
1099
1100                 // Also, we need to make sure that the correct elements are being returned
1101                 // (IE returns comment nodes in a '*' query)
1102                 if ( jQuery.browser.msie ) {
1103                         for ( var i = 0; second[ i ]; i++ )
1104                                 if ( second[ i ].nodeType != 8 )
1105                                         first.push( second[ i ] );
1106
1107                 } else
1108                         for ( var i = 0; second[ i ]; i++ )
1109                                 first.push( second[ i ] );
1110
1111                 return first;
1112         },
1113
1114         unique: function( array ) {
1115                 var ret = [], done = {};
1116
1117                 try {
1118
1119                         for ( var i = 0, length = array.length; i < length; i++ ) {
1120                                 var id = jQuery.data( array[ i ] );
1121
1122                                 if ( !done[ id ] ) {
1123                                         done[ id ] = true;
1124                                         ret.push( array[ i ] );
1125                                 }
1126                         }
1127
1128                 } catch( e ) {
1129                         ret = array;
1130                 }
1131
1132                 return ret;
1133         },
1134
1135         grep: function( elems, callback, inv ) {
1136                 // If a string is passed in for the function, make a function
1137                 // for it (a handy shortcut)
1138                 if ( typeof callback == "string" )
1139                         callback = eval("false||function(a,i){return " + callback + "}");
1140
1141                 var ret = [];
1142
1143                 // Go through the array, only saving the items
1144                 // that pass the validator function
1145                 for ( var i = 0, length = elems.length; i < length; i++ )
1146                         if ( !inv && callback( elems[ i ], i ) || inv && !callback( elems[ i ], i ) )
1147                                 ret.push( elems[ i ] );
1148
1149                 return ret;
1150         },
1151
1152         map: function( elems, callback ) {
1153                 var ret = [];
1154
1155                 // Go through the array, translating each of the items to their
1156                 // new value (or values).
1157                 for ( var i = 0, length = elems.length; i < length; i++ ) {
1158                         var value = callback( elems[ i ], i );
1159
1160                         if ( value !== null && value != undefined ) {
1161                                 if ( value.constructor != Array )
1162                                         value = [ value ];
1163
1164                                 ret = ret.concat( value );
1165                         }
1166                 }
1167
1168                 return ret;
1169         }
1170 });
1171
1172 var userAgent = navigator.userAgent.toLowerCase();
1173
1174 // Figure out what browser is being used
1175 jQuery.browser = {
1176         version: (userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [])[1],
1177         safari: /webkit/.test( userAgent ),
1178         opera: /opera/.test( userAgent ),
1179         msie: /msie/.test( userAgent ) && !/opera/.test( userAgent ),
1180         mozilla: /mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent )
1181 };
1182
1183 var styleFloat = jQuery.browser.msie ?
1184         "styleFloat" :
1185         "cssFloat";
1186
1187 jQuery.extend({
1188         // Check to see if the W3C box model is being used
1189         boxModel: !jQuery.browser.msie || document.compatMode == "CSS1Compat",
1190
1191         props: {
1192                 "for": "htmlFor",
1193                 "class": "className",
1194                 "float": styleFloat,
1195                 cssFloat: styleFloat,
1196                 styleFloat: styleFloat,
1197                 innerHTML: "innerHTML",
1198                 className: "className",
1199                 value: "value",
1200                 disabled: "disabled",
1201                 checked: "checked",
1202                 readonly: "readOnly",
1203                 selected: "selected",
1204                 maxlength: "maxLength",
1205                 selectedIndex: "selectedIndex",
1206                 defaultValue: "defaultValue",
1207                 tagName: "tagName",
1208                 nodeName: "nodeName"
1209         }
1210 });
1211
1212 jQuery.each({
1213         parent: "elem.parentNode",
1214         parents: "jQuery.dir(elem,'parentNode')",
1215         next: "jQuery.nth(elem,2,'nextSibling')",
1216         prev: "jQuery.nth(elem,2,'previousSibling')",
1217         nextAll: "jQuery.dir(elem,'nextSibling')",
1218         prevAll: "jQuery.dir(elem,'previousSibling')",
1219         siblings: "jQuery.sibling(elem.parentNode.firstChild,elem)",
1220         children: "jQuery.sibling(elem.firstChild)",
1221         contents: "jQuery.nodeName(elem,'iframe')?elem.contentDocument||elem.contentWindow.document:jQuery.makeArray(elem.childNodes)"
1222 }, function(name, fn){
1223         fn = eval("false||function(elem){return " + fn + "}");
1224
1225         jQuery.fn[ name ] = function( selector ) {
1226                 var ret = jQuery.map( this, fn );
1227
1228                 if ( selector && typeof selector == "string" )
1229                         ret = jQuery.multiFilter( selector, ret );
1230
1231                 return this.pushStack( jQuery.unique( ret ) );
1232         };
1233 });
1234
1235 jQuery.each({
1236         appendTo: "append",
1237         prependTo: "prepend",
1238         insertBefore: "before",
1239         insertAfter: "after",
1240         replaceAll: "replaceWith"
1241 }, function(name, original){
1242         jQuery.fn[ name ] = function() {
1243                 var args = arguments;
1244
1245                 return this.each(function(){
1246                         for ( var i = 0, length = args.length; i < length; i++ )
1247                                 jQuery( args[ i ] )[ original ]( this );
1248                 });
1249         };
1250 });
1251
1252 jQuery.each({
1253         removeAttr: function( name ) {
1254                 jQuery.attr( this, name, "" );
1255                 if (this.nodeType == 1)
1256                         this.removeAttribute( name );
1257         },
1258
1259         addClass: function( classNames ) {
1260                 jQuery.className.add( this, classNames );
1261         },
1262
1263         removeClass: function( classNames ) {
1264                 jQuery.className.remove( this, classNames );
1265         },
1266
1267         toggleClass: function( classNames ) {
1268                 jQuery.className[ jQuery.className.has( this, classNames ) ? "remove" : "add" ]( this, classNames );
1269         },
1270
1271         remove: function( selector ) {
1272                 if ( !selector || jQuery.filter( selector, [ this ] ).r.length ) {
1273                         // Prevent memory leaks
1274                         jQuery( "*", this ).add(this).each(function(){
1275                                 jQuery.event.remove(this);
1276                                 jQuery.removeData(this);
1277                         });
1278                         if (this.parentNode)
1279                                 this.parentNode.removeChild( this );
1280                 }
1281         },
1282
1283         empty: function() {
1284                 // Remove element nodes and prevent memory leaks
1285                 jQuery( ">*", this ).remove();
1286
1287                 // Remove any remaining nodes
1288                 while ( this.firstChild )
1289                         this.removeChild( this.firstChild );
1290         }
1291 }, function(name, fn){
1292         jQuery.fn[ name ] = function(){
1293                 return this.each( fn, arguments );
1294         };
1295 });
1296
1297 jQuery.each([ "Height", "Width" ], function(i, name){
1298         var type = name.toLowerCase();
1299
1300         jQuery.fn[ type ] = function( size ) {
1301                 // Get window width or height
1302                 return this[0] == window ?
1303                         // Opera reports document.body.client[Width/Height] properly in both quirks and standards
1304                         jQuery.browser.opera && document.body[ "client" + name ] ||
1305
1306                         // Safari reports inner[Width/Height] just fine (Mozilla and Opera include scroll bar widths)
1307                         jQuery.browser.safari && window[ "inner" + name ] ||
1308
1309                         // Everyone else use document.documentElement or document.body depending on Quirks vs Standards mode
1310                         document.compatMode == "CSS1Compat" && document.documentElement[ "client" + name ] || document.body[ "client" + name ] :
1311
1312                         // Get document width or height
1313                         this[0] == document ?
1314                                 // Either scroll[Width/Height] or offset[Width/Height], whichever is greater (Mozilla reports scrollWidth the same as offsetWidth)
1315                                 Math.max( document.body[ "scroll" + name ], document.body[ "offset" + name ] ) :
1316
1317                                 // Get or set width or height on the element
1318                                 size == undefined ?
1319                                         // Get width or height on the element
1320                                         (this.length ? jQuery.css( this[0], type ) : null) :
1321
1322                                         // Set the width or height on the element (default to pixels if value is unitless)
1323                                         this.css( type, size.constructor == String ? size : size + "px" );
1324         };
1325 });