src/core.js

   1 var
   2         // Will speed up references to window, and allows munging its name.
   3         window = this,
   4         // Will speed up references to undefined, and allows munging its name.
   5         undefined,
   6         // Map over jQuery in case of overwrite
   7         _jQuery = window.jQuery,
   8         // Map over the $ in case of overwrite
   9         _$ = window.$,
  10
  11         jQuery = window.jQuery = window.$ = function( selector, context ) {
  12                 // The jQuery object is actually just the init constructor 'enhanced'
  13                 return new jQuery.fn.init( selector, context );
  14         },
  15
  16         // A simple way to check for HTML strings or ID strings
  17         // (both of which we optimize for)
  18         quickExpr = /^[^<]*(<(.|\s)+>)[^>]*$|^#([\w-]+)$/,
  19         // Is it a simple selector
  20         isSimple = /^.[^:#\[\.,]*$/;
  21
  22 jQuery.fn = jQuery.prototype = {
  23         init: function( selector, context ) {
  24                 // Make sure that a selection was provided
  25                 selector = selector || document;
  26
  27                 // Handle $(DOMElement)
  28                 if ( selector.nodeType ) {
  29                         this[0] = selector;
  30                         this.length = 1;
  31                         this.context = selector;
  32                         return this;
  33                 }
  34                 // Handle HTML strings
  35                 if ( typeof selector === "string" ) {
  36                         // Are we dealing with HTML string or an ID?
  37                         var match = quickExpr.exec( selector );
  38
  39                         // Verify a match, and that no context was specified for #id
  40                         if ( match && (match[1] || !context) ) {
  41
  42                                 // HANDLE: $(html) -> $(array)
  43                                 if ( match[1] )
  44                                         selector = jQuery.clean( [ match[1] ], context );
  45
  46                                 // HANDLE: $("#id")
  47                                 else {
  48                                         var elem = document.getElementById( match[3] );
  49
  50                                         // Make sure an element was located
  51                                         if ( elem ){
  52                                                 // Handle the case where IE and Opera return items
  53                                                 // by name instead of ID
  54                                                 if ( elem.id != match[3] )
  55                                                         return jQuery().find( selector );
  56
  57                                                 // Otherwise, we inject the element directly into the jQuery object
  58                                                 var ret = jQuery( elem );
  59                                                 ret.context = document;
  60                                                 ret.selector = selector;
  61                                                 return ret;
  62                                         }
  63                                         selector = [];
  64                                 }
  65
  66                         // HANDLE: $(expr, [context])
  67                         // (which is just equivalent to: $(content).find(expr)
  68                         } else
  69                                 return jQuery( context ).find( selector );
  70
  71                 // HANDLE: $(function)
  72                 // Shortcut for document ready
  73                 } else if ( jQuery.isFunction( selector ) )
  74                         return jQuery( document ).ready( selector );
  75
  76                 return this.setArray(jQuery.makeArray(selector));
  77         },
  78
  79         // Start with an empty selector
  80         selector: "",
  81
  82         // The current version of jQuery being used
  83         jquery: "@VERSION",
  84
  85         // The number of elements contained in the matched element set
  86         size: function() {
  87                 return this.length;
  88         },
  89
  90         // Get the Nth element in the matched element set OR
  91         // Get the whole matched element set as a clean array
  92         get: function( num ) {
  93                 return num === undefined ?
  94
  95                         // Return a 'clean' array
  96                         jQuery.makeArray( this ) :
  97
  98                         // Return just the object
  99                         this[ num ];
 100         },
 101
 102         // Take an array of elements and push it onto the stack
 103         // (returning the new matched element set)
 104         pushStack: function( elems, name, selector ) {
 105                 // Build a new jQuery matched element set
 106                 var ret = jQuery( elems );
 107
 108                 // Add the old object onto the stack (as a reference)
 109                 ret.prevObject = this;
 110
 111                 ret.context = this.context;
 112
 113                 if ( name === "find" )
 114                         ret.selector = this.selector + (this.selector ? " " : "") + selector;
 115                 else if ( name )
 116                         ret.selector = this.selector + "." + name + "(" + selector + ")";
 117
 118                 // Return the newly-formed element set
 119                 return ret;
 120         },
 121
 122         // Force the current matched set of elements to become
 123         // the specified array of elements (destroying the stack in the process)
 124         // You should use pushStack() in order to do this, but maintain the stack
 125         setArray: function( elems ) {
 126                 // Resetting the length to 0, then using the native Array push
 127                 // is a super-fast way to populate an object with array-like properties
 128                 this.length = 0;
 129                 Array.prototype.push.apply( this, elems );
 130
 131                 return this;
 132         },
 133
 134         // Execute a callback for every element in the matched set.
 135         // (You can seed the arguments with an array of args, but this is
 136         // only used internally.)
 137         each: function( callback, args ) {
 138                 return jQuery.each( this, callback, args );
 139         },
 140
 141         // Determine the position of an element within
 142         // the matched set of elements
 143         index: function( elem ) {
 144                 // Locate the position of the desired element
 145                 return jQuery.inArray(
 146                         // If it receives a jQuery object, the first element is used
 147                         elem && elem.jquery ? elem[0] : elem
 148                 , this );
 149         },
 150
 151         attr: function( name, value, type ) {
 152                 var options = name;
 153
 154                 // Look for the case where we're accessing a style value
 155                 if ( typeof name === "string" )
 156                         if ( value === undefined )
 157                                 return this[0] && jQuery[ type || "attr" ]( this[0], name );
 158
 159                         else {
 160                                 options = {};
 161                                 options[ name ] = value;
 162                         }
 163
 164                 // Check to see if we're setting style values
 165                 return this.each(function(i){
 166                         // Set all the styles
 167                         for ( name in options )
 168                                 jQuery.attr(
 169                                         type ?
 170                                                 this.style :
 171                                                 this,
 172                                         name, jQuery.prop( this, options[ name ], type, i, name )
 173                                 );
 174                 });
 175         },
 176
 177         css: function( key, value ) {
 178                 // ignore negative width and height values
 179                 if ( (key == 'width' || key == 'height') && parseFloat(value) < 0 )
 180                         value = undefined;
 181                 return this.attr( key, value, "curCSS" );
 182         },
 183
 184         text: function( text ) {
 185                 if ( typeof text !== "object" && text != null )
 186                         return this.empty().append( (this[0] && this[0].ownerDocument || document).createTextNode( text ) );
 187
 188                 var ret = "";
 189
 190                 jQuery.each( text || this, function(){
 191                         jQuery.each( this.childNodes, function(){
 192                                 if ( this.nodeType != 8 )
 193                                         ret += this.nodeType != 1 ?
 194                                                 this.nodeValue :
 195                                                 jQuery.fn.text( [ this ] );
 196                         });
 197                 });
 198
 199                 return ret;
 200         },
 201
 202         wrapAll: function( html ) {
 203                 if ( this[0] )
 204                         // The elements to wrap the target around
 205                         jQuery( html, this[0].ownerDocument )
 206                                 .clone()
 207                                 .insertBefore( this[0] )
 208                                 .map(function(){
 209                                         var elem = this;
 210
 211                                         while ( elem.firstChild )
 212                                                 elem = elem.firstChild;
 213
 214                                         return elem;
 215                                 })
 216                                 .append(this);
 217
 218                 return this;
 219         },
 220
 221         wrapInner: function( html ) {
 222                 return this.each(function(){
 223                         jQuery( this ).contents().wrapAll( html );
 224                 });
 225         },
 226
 227         wrap: function( html ) {
 228                 return this.each(function(){
 229                         jQuery( this ).wrapAll( html );
 230                 });
 231         },
 232
 233         append: function() {
 234                 return this.domManip(arguments, true, function(elem){
 235                         if (this.nodeType == 1)
 236                                 this.appendChild( elem );
 237                 });
 238         },
 239
 240         prepend: function() {
 241                 return this.domManip(arguments, true, function(elem){
 242                         if (this.nodeType == 1)
 243                                 this.insertBefore( elem, this.firstChild );
 244                 });
 245         },
 246
 247         before: function() {
 248                 return this.domManip(arguments, false, function(elem){
 249                         this.parentNode.insertBefore( elem, this );
 250                 });
 251         },
 252
 253         after: function() {
 254                 return this.domManip(arguments, false, function(elem){
 255                         this.parentNode.insertBefore( elem, this.nextSibling );
 256                 });
 257         },
 258
 259         end: function() {
 260                 return this.prevObject || jQuery( [] );
 261         },
 262
 263         find: function( selector ) {
 264                 var elems = jQuery.map(this, function(elem){
 265                         return jQuery.find( selector, elem );
 266                 });
 267
 268                 return this.pushStack( /[^+>] [^+>]/.test( selector ) ?
 269                         jQuery.unique( elems ) :
 270                         elems, "find", selector );
 271         },
 272
 273         clone: function( events ) {
 274                 // Do the clone
 275                 var ret = this.map(function(){
 276                         if ( !jQuery.support.noCloneEvent && !jQuery.isXMLDoc(this) ) {
 277                                 // IE copies events bound via attachEvent when
 278                                 // using cloneNode. Calling detachEvent on the
 279                                 // clone will also remove the events from the orignal
 280                                 // In order to get around this, we use innerHTML.
 281                                 // Unfortunately, this means some modifications to
 282                                 // attributes in IE that are actually only stored
 283                                 // as properties will not be copied (such as the
 284                                 // the name attribute on an input).
 285                                 var clone = this.cloneNode(true),
 286                                         container = document.createElement("div");
 287                                 container.appendChild(clone);
 288                                 return jQuery.clean([container.innerHTML])[0];
 289                         } else
 290                                 return this.cloneNode(true);
 291                 });
 292
 293                 // Need to set the expando to null on the cloned set if it exists
 294                 // removeData doesn't work here, IE removes it from the original as well
 295                 // this is primarily for IE but the data expando shouldn't be copied over in any browser
 296                 var clone = ret.find("*").andSelf().each(function(){
 297                         if ( this[ expando ] !== undefined )
 298                                 this[ expando ] = null;
 299                 });
 300
 301                 // Copy the events from the original to the clone
 302                 if ( events === true )
 303                         this.find("*").andSelf().each(function(i){
 304                                 if (this.nodeType == 3)
 305                                         return;
 306                                 var events = jQuery.data( this, "events" );
 307
 308                                 for ( var type in events )
 309                                         for ( var handler in events[ type ] )
 310                                                 jQuery.event.add( clone[ i ], type, events[ type ][ handler ], events[ type ][ handler ].data );
 311                         });
 312
 313                 // Return the cloned set
 314                 return ret;
 315         },
 316
 317         filter: function( selector ) {
 318                 return this.pushStack(
 319                         jQuery.isFunction( selector ) &&
 320                         jQuery.grep(this, function(elem, i){
 321                                 return selector.call( elem, i );
 322                         }) ||
 323
 324                         jQuery.multiFilter( selector, jQuery.grep(this, function(elem){
 325                                 return elem.nodeType === 1;
 326                         }) ), "filter", selector );
 327         },
 328
 329         closest: function( selector ) {
 330                 return this.map(function(){
 331                         var cur = this;
 332                         while ( cur && cur.ownerDocument ) {
 333                                 if ( jQuery(cur).is(selector) )
 334                                         return cur;
 335                                 cur = cur.parentNode;
 336                         }
 337                 });
 338         },
 339
 340         not: function( selector ) {
 341                 if ( typeof selector === "string" )
 342                         // test special case where just one selector is passed in
 343                         if ( isSimple.test( selector ) )
 344                                 return this.pushStack( jQuery.multiFilter( selector, this, true ), "not", selector );
 345                         else
 346                                 selector = jQuery.multiFilter( selector, this );
 347
 348                 var isArrayLike = selector.length && selector[selector.length - 1] !== undefined && !selector.nodeType;
 349                 return this.filter(function() {
 350                         return isArrayLike ? jQuery.inArray( this, selector ) < 0 : this != selector;
 351                 });
 352         },
 353
 354         add: function( selector ) {
 355                 return this.pushStack( jQuery.unique( jQuery.merge(
 356                         this.get(),
 357                         typeof selector === "string" ?
 358                                 jQuery( selector ) :
 359                                 jQuery.makeArray( selector )
 360                 )));
 361         },
 362
 363         is: function( selector ) {
 364                 return !!selector && jQuery.multiFilter( selector, this ).length > 0;
 365         },
 366
 367         hasClass: function( selector ) {
 368                 return !!selector && this.is( "." + selector );
 369         },
 370
 371         val: function( value ) {
 372                 if ( value === undefined ) {
 373                         var elem = this[0];
 374
 375                         if ( elem ) {
 376                                 if( jQuery.nodeName( elem, 'option' ) )
 377                                         return (elem.attributes.value || {}).specified ? elem.value : elem.text;
 378
 379                                 // We need to handle select boxes special
 380                                 if ( jQuery.nodeName( elem, "select" ) ) {
 381                                         var index = elem.selectedIndex,
 382                                                 values = [],
 383                                                 options = elem.options,
 384                                                 one = elem.type == "select-one";
 385
 386                                         // Nothing was selected
 387                                         if ( index < 0 )
 388                                                 return null;
 389
 390                                         // Loop through all the selected options
 391                                         for ( var i = one ? index : 0, max = one ? index + 1 : options.length; i < max; i++ ) {
 392                                                 var option = options[ i ];
 393
 394                                                 if ( option.selected ) {
 395                                                         // Get the specifc value for the option
 396                                                         value = jQuery(option).val();
 397
 398                                                         // We don't need an array for one selects
 399                                                         if ( one )
 400                                                                 return value;
 401
 402                                                         // Multi-Selects return an array
 403                                                         values.push( value );
 404                                                 }
 405                                         }
 406
 407                                         return values;
 408                                 }
 409
 410                                 // Everything else, we just grab the value
 411                                 return (elem.value || "").replace(/\r/g, "");
 412
 413                         }
 414
 415                         return undefined;
 416                 }
 417
 418                 if ( typeof value === "number" )
 419                         value += '';
 420
 421                 return this.each(function(){
 422                         if ( this.nodeType != 1 )
 423                                 return;
 424
 425                         if ( jQuery.isArray(value) && /radio|checkbox/.test( this.type ) )
 426                                 this.checked = (jQuery.inArray(this.value, value) >= 0 ||
 427                                         jQuery.inArray(this.name, value) >= 0);
 428
 429                         else if ( jQuery.nodeName( this, "select" ) ) {
 430                                 var values = jQuery.makeArray(value);
 431
 432                                 jQuery( "option", this ).each(function(){
 433                                         this.selected = (jQuery.inArray( this.value, values ) >= 0 ||
 434                                                 jQuery.inArray( this.text, values ) >= 0);
 435                                 });
 436
 437                                 if ( !values.length )
 438                                         this.selectedIndex = -1;
 439
 440                         } else
 441                                 this.value = value;
 442                 });
 443         },
 444
 445         html: function( value ) {
 446                 return value === undefined ?
 447                         (this[0] ?
 448                                 this[0].innerHTML :
 449                                 null) :
 450                         this.empty().append( value );
 451         },
 452
 453         replaceWith: function( value ) {
 454                 return this.after( value ).remove();
 455         },
 456
 457         eq: function( i ) {
 458                 return this.slice( i, +i + 1 );
 459         },
 460
 461         slice: function() {
 462                 return this.pushStack( Array.prototype.slice.apply( this, arguments ),
 463                         "slice", Array.prototype.slice.call(arguments).join(",") );
 464         },
 465
 466         map: function( callback ) {
 467                 return this.pushStack( jQuery.map(this, function(elem, i){
 468                         return callback.call( elem, i, elem );
 469                 }));
 470         },
 471
 472         andSelf: function() {
 473                 return this.add( this.prevObject );
 474         },
 475
 476         domManip: function( args, table, callback ) {
 477                 if ( this[0] ) {
 478                         var fragment = this[0].ownerDocument.createDocumentFragment(),
 479                                 scripts = jQuery.clean( args, this[0].ownerDocument, fragment ),
 480                                 first = fragment.firstChild,
 481                                 extra = this.length > 1 ? fragment.cloneNode(true) : fragment;
 482
 483                         if ( first )
 484                                 for ( var i = 0, l = this.length; i < l; i++ )
 485                                         callback.call( root(this[i], first), i > 0 ? extra.cloneNode(true) : fragment );
 486
 487                         if ( scripts )
 488                                 jQuery.each( scripts, evalScript );
 489                 }
 490
 491                 return this;
 492
 493                 function root( elem, cur ) {
 494                         return table && jQuery.nodeName(elem, "table") && jQuery.nodeName(cur, "tr") ?
 495                                 (elem.getElementsByTagName("tbody")[0] ||
 496                                 elem.appendChild(elem.ownerDocument.createElement("tbody"))) :
 497                                 elem;
 498                 }
 499         }
 500 };
 501
 502 // Give the init function the jQuery prototype for later instantiation
 503 jQuery.fn.init.prototype = jQuery.fn;
 504
 505 function evalScript( i, elem ) {
 506         if ( elem.src )
 507                 jQuery.ajax({
 508                         url: elem.src,
 509                         async: false,
 510                         dataType: "script"
 511                 });
 512
 513         else
 514                 jQuery.globalEval( elem.text || elem.textContent || elem.innerHTML || "" );
 515
 516         if ( elem.parentNode )
 517                 elem.parentNode.removeChild( elem );
 518 }
 519
 520 function now(){
 521         return +new Date;
 522 }
 523
 524 jQuery.extend = jQuery.fn.extend = function() {
 525         // copy reference to target object
 526         var target = arguments[0] || {}, i = 1, length = arguments.length, deep = false, options;
 527
 528         // Handle a deep copy situation
 529         if ( typeof target === "boolean" ) {
 530                 deep = target;
 531                 target = arguments[1] || {};
 532                 // skip the boolean and the target
 533                 i = 2;
 534         }
 535
 536         // Handle case when target is a string or something (possible in deep copy)
 537         if ( typeof target !== "object" && !jQuery.isFunction(target) )
 538                 target = {};
 539
 540         // extend jQuery itself if only one argument is passed
 541         if ( length == i ) {
 542                 target = this;
 543                 --i;
 544         }
 545
 546         for ( ; i < length; i++ )
 547                 // Only deal with non-null/undefined values
 548                 if ( (options = arguments[ i ]) != null )
 549                         // Extend the base object
 550                         for ( var name in options ) {
 551                                 var src = target[ name ], copy = options[ name ];
 552
 553                                 // Prevent never-ending loop
 554                                 if ( target === copy )
 555                                         continue;
 556
 557                                 // Recurse if we're merging object values
 558                                 if ( deep && copy && typeof copy === "object" && !copy.nodeType )
 559                                         target[ name ] = jQuery.extend( deep,
 560                                                 // Never move original objects, clone them
 561                                                 src || ( copy.length != null ? [ ] : { } )
 562                                         , copy );
 563
 564                                 // Don't bring in undefined values
 565                                 else if ( copy !== undefined )
 566                                         target[ name ] = copy;
 567
 568                         }
 569
 570         // Return the modified object
 571         return target;
 572 };
 573
 574 // exclude the following css properties to add px
 575 var     exclude = /z-?index|font-?weight|opacity|zoom|line-?height/i,
 576         // cache defaultView
 577         defaultView = document.defaultView || {},
 578         toString = Object.prototype.toString;
 579
 580 jQuery.extend({
 581         noConflict: function( deep ) {
 582                 window.$ = _$;
 583
 584                 if ( deep )
 585                         window.jQuery = _jQuery;
 586
 587                 return jQuery;
 588         },
 589
 590         // See test/unit/core.js for details concerning isFunction.
 591         // Since version 1.3, DOM methods and functions like alert
 592         // aren't supported. They return false on IE (#2968).
 593         isFunction: function( obj ) {
 594                 return toString.call(obj) === "[object Function]";
 595         },
 596
 597         isArray: function( obj ) {
 598                 return toString.call(obj) === "[object Array]";
 599         },
 600
 601         // check if an element is in a (or is an) XML document
 602         isXMLDoc: function( elem ) {
 603                 return elem.documentElement && !elem.body ||
 604                         elem.tagName && elem.ownerDocument && !elem.ownerDocument.body;
 605         },
 606
 607         // Evalulates a script in a global context
 608         globalEval: function( data ) {
 609                 data = jQuery.trim( data );
 610
 611                 if ( data ) {
 612                         // Inspired by code by Andrea Giammarchi
 613                         // http://webreflection.blogspot.com/2007/08/global-scope-evaluation-and-dom.html
 614                         var head = document.getElementsByTagName("head")[0] || document.documentElement,
 615                                 script = document.createElement("script");
 616
 617                         script.type = "text/javascript";
 618                         if ( jQuery.support.scriptEval )
 619                                 script.appendChild( document.createTextNode( data ) );
 620                         else
 621                                 script.text = data;
 622
 623                         // Use insertBefore instead of appendChild  to circumvent an IE6 bug.
 624                         // This arises when a base node is used (#2709).
 625                         head.insertBefore( script, head.firstChild );
 626                         head.removeChild( script );
 627                 }
 628         },
 629
 630         nodeName: function( elem, name ) {
 631                 return elem.nodeName && elem.nodeName.toUpperCase() == name.toUpperCase();
 632         },
 633
 634         // args is for internal usage only
 635         each: function( object, callback, args ) {
 636                 var name, i = 0, length = object.length;
 637
 638                 if ( args ) {
 639                         if ( length === undefined ) {
 640                                 for ( name in object )
 641                                         if ( callback.apply( object[ name ], args ) === false )
 642                                                 break;
 643                         } else
 644                                 for ( ; i < length; )
 645                                         if ( callback.apply( object[ i++ ], args ) === false )
 646                                                 break;
 647
 648                 // A special, fast, case for the most common use of each
 649                 } else {
 650                         if ( length === undefined ) {
 651                                 for ( name in object )
 652                                         if ( callback.call( object[ name ], name, object[ name ] ) === false )
 653                                                 break;
 654                         } else
 655                                 for ( var value = object[0];
 656                                         i < length && callback.call( value, i, value ) !== false; value = object[++i] ){}
 657                 }
 658
 659                 return object;
 660         },
 661
 662         prop: function( elem, value, type, i, name ) {
 663                 // Handle executable functions
 664                 if ( jQuery.isFunction( value ) )
 665                         value = value.call( elem, i );
 666
 667                 // Handle passing in a number to a CSS property
 668                 return typeof value === "number" && type == "curCSS" && !exclude.test( name ) ?
 669                         value + "px" :
 670                         value;
 671         },
 672
 673         className: {
 674                 // internal only, use addClass("class")
 675                 add: function( elem, classNames ) {
 676                         jQuery.each((classNames || "").split(/\s+/), function(i, className){
 677                                 if ( elem.nodeType == 1 && !jQuery.className.has( elem.className, className ) )
 678                                         elem.className += (elem.className ? " " : "") + className;
 679                         });
 680                 },
 681
 682                 // internal only, use removeClass("class")
 683                 remove: function( elem, classNames ) {
 684                         if (elem.nodeType == 1)
 685                                 elem.className = classNames !== undefined ?
 686                                         jQuery.grep(elem.className.split(/\s+/), function(className){
 687                                                 return !jQuery.className.has( classNames, className );
 688                                         }).join(" ") :
 689                                         "";
 690                 },
 691
 692                 // internal only, use hasClass("class")
 693                 has: function( elem, className ) {
 694                         return jQuery.inArray( className, (elem.className || elem).toString().split(/\s+/) ) > -1;
 695                 }
 696         },
 697
 698         // A method for quickly swapping in/out CSS properties to get correct calculations
 699         swap: function( elem, options, callback ) {
 700                 var old = {};
 701                 // Remember the old values, and insert the new ones
 702                 for ( var name in options ) {
 703                         old[ name ] = elem.style[ name ];
 704                         elem.style[ name ] = options[ name ];
 705                 }
 706
 707                 callback.call( elem );
 708
 709                 // Revert the old values
 710                 for ( var name in options )
 711                         elem.style[ name ] = old[ name ];
 712         },
 713
 714         css: function( elem, name, force ) {
 715                 if ( name == "width" || name == "height" ) {
 716                         var val, props = { position: "absolute", visibility: "hidden", display:"block" }, which = name == "width" ? [ "Left", "Right" ] : [ "Top", "Bottom" ];
 717
 718                         function getWH() {
 719                                 val = name == "width" ? elem.offsetWidth : elem.offsetHeight;
 720                                 var padding = 0, border = 0;
 721                                 jQuery.each( which, function() {
 722                                         padding += parseFloat(jQuery.curCSS( elem, "padding" + this, true)) || 0;
 723                                         border += parseFloat(jQuery.curCSS( elem, "border" + this + "Width", true)) || 0;
 724                                 });
 725                                 val -= Math.round(padding + border);
 726                         }
 727
 728                         if ( jQuery(elem).is(":visible") )
 729                                 getWH();
 730                         else
 731                                 jQuery.swap( elem, props, getWH );
 732
 733                         return Math.max(0, val);
 734                 }
 735
 736                 return jQuery.curCSS( elem, name, force );
 737         },
 738
 739         curCSS: function( elem, name, force ) {
 740                 var ret, style = elem.style;
 741
 742                 // We need to handle opacity special in IE
 743                 if ( name == "opacity" && !jQuery.support.opacity ) {
 744                         ret = jQuery.attr( style, "opacity" );
 745
 746                         return ret == "" ?
 747                                 "1" :
 748                                 ret;
 749                 }
 750
 751                 // Make sure we're using the right name for getting the float value
 752                 if ( name.match( /float/i ) )
 753                         name = styleFloat;
 754
 755                 if ( !force && style && style[ name ] )
 756                         ret = style[ name ];
 757
 758                 else if ( defaultView.getComputedStyle ) {
 759
 760                         // Only "float" is needed here
 761                         if ( name.match( /float/i ) )
 762                                 name = "float";
 763
 764                         name = name.replace( /([A-Z])/g, "-$1" ).toLowerCase();
 765
 766                         var computedStyle = defaultView.getComputedStyle( elem, null );
 767
 768                         if ( computedStyle )
 769                                 ret = computedStyle.getPropertyValue( name );
 770
 771                         // We should always get a number back from opacity
 772                         if ( name == "opacity" && ret == "" )
 773                                 ret = "1";
 774
 775                 } else if ( elem.currentStyle ) {
 776                         var camelCase = name.replace(/\-(\w)/g, function(all, letter){
 777                                 return letter.toUpperCase();
 778                         });
 779
 780                         ret = elem.currentStyle[ name ] || elem.currentStyle[ camelCase ];
 781
 782                         // From the awesome hack by Dean Edwards
 783                         // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
 784
 785                         // If we're not dealing with a regular pixel number
 786                         // but a number that has a weird ending, we need to convert it to pixels
 787                         if ( !/^\d+(px)?$/i.test( ret ) && /^\d/.test( ret ) ) {
 788                                 // Remember the original values
 789                                 var left = style.left, rsLeft = elem.runtimeStyle.left;
 790
 791                                 // Put in the new values to get a computed value out
 792                                 elem.runtimeStyle.left = elem.currentStyle.left;
 793                                 style.left = ret || 0;
 794                                 ret = style.pixelLeft + "px";
 795
 796                                 // Revert the changed values
 797                                 style.left = left;
 798                                 elem.runtimeStyle.left = rsLeft;
 799                         }
 800                 }
 801
 802                 return ret;
 803         },
 804
 805         clean: function( elems, context, fragment ) {
 806                 context = context || document;
 807
 808                 // !context.createElement fails in IE with an error but returns typeof 'object'
 809                 if ( typeof context.createElement === "undefined" )
 810                         context = context.ownerDocument || context[0] && context[0].ownerDocument || document;
 811
 812                 // If a single string is passed in and it's a single tag
 813                 // just do a createElement and skip the rest
 814                 if ( !fragment && elems.length === 1 && typeof elems[0] === "string" ) {
 815                         var match = /^<(\w+)\s*\/?>$/.exec(elems[0]);
 816                         if ( match )
 817                                 return [ context.createElement( match[1] ) ];
 818                 }
 819
 820                 var ret = [], scripts = [], div = context.createElement("div");
 821
 822                 jQuery.each(elems, function(i, elem){
 823                         if ( typeof elem === "number" )
 824                                 elem += '';
 825
 826                         if ( !elem )
 827                                 return;
 828
 829                         // Convert html string into DOM nodes
 830                         if ( typeof elem === "string" ) {
 831                                 // Fix "XHTML"-style tags in all browsers
 832                                 elem = elem.replace(/(<(\w+)[^>]*?)\/>/g, function(all, front, tag){
 833                                         return tag.match(/^(abbr|br|col|img|input|link|meta|param|hr|area|embed)$/i) ?
 834                                                 all :
 835                                                 front + "></" + tag + ">";
 836                                 });
 837
 838                                 // Trim whitespace, otherwise indexOf won't work as expected
 839                                 var tags = jQuery.trim( elem ).toLowerCase();
 840
 841                                 var wrap =
 842                                         // option or optgroup
 843                                         !tags.indexOf("<opt") &&
 844                                         [ 1, "<select multiple='multiple'>", "</select>" ] ||
 845
 846                                         !tags.indexOf("<leg") &&
 847                                         [ 1, "<fieldset>", "</fieldset>" ] ||
 848
 849                                         tags.match(/^<(thead|tbody|tfoot|colg|cap)/) &&
 850                                         [ 1, "<table>", "</table>" ] ||
 851
 852                                         !tags.indexOf("<tr") &&
 853                                         [ 2, "<table><tbody>", "</tbody></table>" ] ||
 854
 855                                         // <thead> matched above
 856                                         (!tags.indexOf("<td") || !tags.indexOf("<th")) &&
 857                                         [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ] ||
 858
 859                                         !tags.indexOf("<col") &&
 860                                         [ 2, "<table><tbody></tbody><colgroup>", "</colgroup></table>" ] ||
 861
 862                                         // IE can't serialize <link> and <script> tags normally
 863                                         !jQuery.support.htmlSerialize &&
 864                                         [ 1, "div<div>", "</div>" ] ||
 865
 866                                         [ 0, "", "" ];
 867
 868                                 // Go to html and back, then peel off extra wrappers
 869                                 div.innerHTML = wrap[1] + elem + wrap[2];
 870
 871                                 // Move to the right depth
 872                                 while ( wrap[0]-- )
 873                                         div = div.lastChild;
 874
 875                                 // Remove IE's autoinserted <tbody> from table fragments
 876                                 if ( !jQuery.support.tbody ) {
 877
 878                                         // String was a <table>, *may* have spurious <tbody>
 879                                         var tbody = !tags.indexOf("<table") && tags.indexOf("<tbody") < 0 ?
 880                                                 div.firstChild && div.firstChild.childNodes :
 881
 882                                                 // String was a bare <thead> or <tfoot>
 883                                                 wrap[1] == "<table>" && tags.indexOf("<tbody") < 0 ?
 884                                                         div.childNodes :
 885                                                         [];
 886
 887                                         for ( var j = tbody.length - 1; j >= 0 ; --j )
 888                                                 if ( jQuery.nodeName( tbody[ j ], "tbody" ) && !tbody[ j ].childNodes.length )
 889                                                         tbody[ j ].parentNode.removeChild( tbody[ j ] );
 890
 891                                         }
 892
 893                                 // IE completely kills leading whitespace when innerHTML is used
 894                                 if ( !jQuery.support.leadingWhitespace && /^\s/.test( elem ) )
 895                                         div.insertBefore( context.createTextNode( elem.match(/^\s*/)[0] ), div.firstChild );
 896
 897                                 if ( fragment ) {
 898                                         var found = div.getElementsByTagName("script");
 899
 900                                         while ( found.length ) {
 901                                                 scripts.push( found[0] );
 902                                                 found[0].parentNode.removeChild( found[0] );
 903                                         }
 904                                 }
 905
 906                                 elem = jQuery.makeArray( div.childNodes );
 907                         }
 908
 909                         if ( elem.nodeType )
 910                                 ret.push( elem );
 911                         else
 912                                 ret = jQuery.merge( ret, elem );
 913
 914                 });
 915
 916                 if ( fragment ) {
 917                         for ( var i = 0; ret[i]; i++ ) {
 918                                 var node = ret[i];
 919                                 if ( jQuery.nodeName( node, "script" ) ) {
 920                                         if( node.parentNode )
 921                                                 node.parentNode.removeChild( node );
 922                                 } else {
 923                                         if ( node.nodeType === 1 )
 924                                                 ret = jQuery.merge( ret, node.getElementsByTagName("script"));
 925                                         fragment.appendChild( node );
 926                                 }
 927                         }
 928
 929                         return scripts;
 930                 }
 931
 932                 return ret;
 933         },
 934
 935         attr: function( elem, name, value ) {
 936                 // don't set attributes on text and comment nodes
 937                 if (!elem || elem.nodeType == 3 || elem.nodeType == 8)
 938                         return undefined;
 939
 940                 var notxml = !jQuery.isXMLDoc( elem ),
 941                         // Whether we are setting (or getting)
 942                         set = value !== undefined;
 943
 944                 // Try to normalize/fix the name
 945                 name = notxml && jQuery.props[ name ] || name;
 946
 947                 // Only do all the following if this is a node (faster for style)
 948                 // IE elem.getAttribute passes even for style
 949                 if ( elem.tagName ) {
 950
 951                         // These attributes require special treatment
 952                         var special = /href|src|style/.test( name );
 953
 954                         // Safari mis-reports the default selected property of a hidden option
 955                         // Accessing the parent's selectedIndex property fixes it
 956                         if ( name == "selected" )
 957                                 elem.parentNode.selectedIndex;
 958
 959                         // If applicable, access the attribute via the DOM 0 way
 960                         if ( name in elem && notxml && !special ) {
 961                                 if ( set ){
 962                                         // We can't allow the type property to be changed (since it causes problems in IE)
 963                                         if ( name == "type" && jQuery.nodeName( elem, "input" ) && elem.parentNode )
 964                                                 throw "type property can't be changed";
 965
 966                                         elem[ name ] = value;
 967                                 }
 968
 969                                 // browsers index elements by id/name on forms, give priority to attributes.
 970                                 if( jQuery.nodeName( elem, "form" ) && elem.getAttributeNode(name) )
 971                                         return elem.getAttributeNode( name ).nodeValue;
 972
 973                                 return elem[ name ];
 974                         }
 975
 976                         if ( !jQuery.support.style && notxml &&  name == "style" )
 977                                 return jQuery.attr( elem.style, "cssText", value );
 978
 979                         if ( set )
 980                                 // convert the value to a string (all browsers do this but IE) see #1070
 981                                 elem.setAttribute( name, "" + value );
 982
 983                         var attr = !jQuery.support.hrefNormalized && notxml && special
 984                                         // Some attributes require a special call on IE
 985                                         ? elem.getAttribute( name, 2 )
 986                                         : elem.getAttribute( name );
 987
 988                         // Non-existent attributes return null, we normalize to undefined
 989                         return attr === null ? undefined : attr;
 990                 }
 991
 992                 // elem is actually elem.style ... set the style
 993
 994                 // IE uses filters for opacity
 995                 if ( !jQuery.support.opacity && name == "opacity" ) {
 996                         if ( set ) {
 997                                 // IE has trouble with opacity if it does not have layout
 998                                 // Force it by setting the zoom level
 999                                 elem.zoom = 1;
1000
1001                                 // Set the alpha filter to set the opacity
1002                                 elem.filter = (elem.filter || "").replace( /alpha\([^)]*\)/, "" ) +
1003                                         (parseInt( value ) + '' == "NaN" ? "" : "alpha(opacity=" + value * 100 + ")");
1004                         }
1005
1006                         return elem.filter && elem.filter.indexOf("opacity=") >= 0 ?
1007                                 (parseFloat( elem.filter.match(/opacity=([^)]*)/)[1] ) / 100) + '':
1008                                 "";
1009                 }
1010
1011                 name = name.replace(/-([a-z])/ig, function(all, letter){
1012                         return letter.toUpperCase();
1013                 });
1014
1015                 if ( set )
1016                         elem[ name ] = value;
1017
1018                 return elem[ name ];
1019         },
1020
1021         trim: function( text ) {
1022                 return (text || "").replace( /^\s+|\s+$/g, "" );
1023         },
1024
1025         makeArray: function( array ) {
1026                 var ret = [];
1027
1028                 if( array != null ){
1029                         var i = array.length;
1030                         // The window, strings (and functions) also have 'length'
1031                         if( i == null || typeof array === "string" || jQuery.isFunction(array) || array.setInterval )
1032                                 ret[0] = array;
1033                         else
1034                                 while( i )
1035                                         ret[--i] = array[i];
1036                 }
1037
1038                 return ret;
1039         },
1040
1041         inArray: function( elem, array ) {
1042                 for ( var i = 0, length = array.length; i < length; i++ )
1043                 // Use === because on IE, window == document
1044                         if ( array[ i ] === elem )
1045                                 return i;
1046
1047                 return -1;
1048         },
1049
1050         merge: function( first, second ) {
1051                 // We have to loop this way because IE & Opera overwrite the length
1052                 // expando of getElementsByTagName
1053                 var i = 0, elem, pos = first.length;
1054                 // Also, we need to make sure that the correct elements are being returned
1055                 // (IE returns comment nodes in a '*' query)
1056                 if ( !jQuery.support.getAll ) {
1057                         while ( (elem = second[ i++ ]) != null )
1058                                 if ( elem.nodeType != 8 )
1059                                         first[ pos++ ] = elem;
1060
1061                 } else
1062                         while ( (elem = second[ i++ ]) != null )
1063                                 first[ pos++ ] = elem;
1064
1065                 return first;
1066         },
1067
1068         unique: function( array ) {
1069                 var ret = [], done = {};
1070
1071                 try {
1072
1073                         for ( var i = 0, length = array.length; i < length; i++ ) {
1074                                 var id = jQuery.data( array[ i ] );
1075
1076                                 if ( !done[ id ] ) {
1077                                         done[ id ] = true;
1078                                         ret.push( array[ i ] );
1079                                 }
1080                         }
1081
1082                 } catch( e ) {
1083                         ret = array;
1084                 }
1085
1086                 return ret;
1087         },
1088
1089         grep: function( elems, callback, inv ) {
1090                 var ret = [];
1091
1092                 // Go through the array, only saving the items
1093                 // that pass the validator function
1094                 for ( var i = 0, length = elems.length; i < length; i++ )
1095                         if ( !inv != !callback( elems[ i ], i ) )
1096                                 ret.push( elems[ i ] );
1097
1098                 return ret;
1099         },
1100
1101         map: function( elems, callback ) {
1102                 var ret = [];
1103
1104                 // Go through the array, translating each of the items to their
1105                 // new value (or values).
1106                 for ( var i = 0, length = elems.length; i < length; i++ ) {
1107                         var value = callback( elems[ i ], i );
1108
1109                         if ( value != null )
1110                                 ret[ ret.length ] = value;
1111                 }
1112
1113                 return ret.concat.apply( [], ret );
1114         }
1115 });
1116
1117 // Use of jQuery.browser is deprecated.
1118 // It's included for backwards compatibility and plugins,
1119 // although they should work to migrate away.
1120
1121 var userAgent = navigator.userAgent.toLowerCase();
1122
1123 // Figure out what browser is being used
1124 jQuery.browser = {
1125         version: (userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [0,'0'])[1],
1126         safari: /webkit/.test( userAgent ),
1127         opera: /opera/.test( userAgent ),
1128         msie: /msie/.test( userAgent ) && !/opera/.test( userAgent ),
1129         mozilla: /mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent )
1130 };
1131
1132 // Check to see if the W3C box model is being used
1133 jQuery.boxModel = !jQuery.browser.msie || document.compatMode == "CSS1Compat";
1134
1135 jQuery.each({
1136         parent: function(elem){return elem.parentNode;},
1137         parents: function(elem){return jQuery.dir(elem,"parentNode");},
1138         next: function(elem){return jQuery.nth(elem,2,"nextSibling");},
1139         prev: function(elem){return jQuery.nth(elem,2,"previousSibling");},
1140         nextAll: function(elem){return jQuery.dir(elem,"nextSibling");},
1141         prevAll: function(elem){return jQuery.dir(elem,"previousSibling");},
1142         siblings: function(elem){return jQuery.sibling(elem.parentNode.firstChild,elem);},
1143         children: function(elem){return jQuery.sibling(elem.firstChild);},
1144         contents: function(elem){return jQuery.nodeName(elem,"iframe")?elem.contentDocument||elem.contentWindow.document:jQuery.makeArray(elem.childNodes);}
1145 }, function(name, fn){
1146         jQuery.fn[ name ] = function( selector ) {
1147                 var ret = jQuery.map( this, fn );
1148
1149                 if ( selector && typeof selector == "string" )
1150                         ret = jQuery.multiFilter( selector, ret );
1151
1152                 return this.pushStack( jQuery.unique( ret ), name, selector );
1153         };
1154 });
1155
1156 jQuery.each({
1157         appendTo: "append",
1158         prependTo: "prepend",
1159         insertBefore: "before",
1160         insertAfter: "after",
1161         replaceAll: "replaceWith"
1162 }, function(name, original){
1163         jQuery.fn[ name ] = function() {
1164                 var args = arguments;
1165
1166                 return this.each(function(){
1167                         for ( var i = 0, length = args.length; i < length; i++ )
1168                                 jQuery( args[ i ] )[ original ]( this );
1169                 });
1170         };
1171 });
1172
1173 jQuery.each({
1174         removeAttr: function( name ) {
1175                 jQuery.attr( this, name, "" );
1176                 if (this.nodeType == 1)
1177                         this.removeAttribute( name );
1178         },
1179
1180         addClass: function( classNames ) {
1181                 jQuery.className.add( this, classNames );
1182         },
1183
1184         removeClass: function( classNames ) {
1185                 jQuery.className.remove( this, classNames );
1186         },
1187
1188         toggleClass: function( classNames, state ) {
1189                 if( typeof state !== "boolean" )
1190                         state = !jQuery.className.has( this, classNames );
1191                 jQuery.className[ state ? "add" : "remove" ]( this, classNames );
1192         },
1193
1194         remove: function( selector ) {
1195                 if ( !selector || jQuery.filter( selector, [ this ] ).length ) {
1196                         // Prevent memory leaks
1197                         jQuery( "*", this ).add([this]).each(function(){
1198                                 jQuery.event.remove(this);
1199                                 jQuery.removeData(this);
1200                         });
1201                         if (this.parentNode)
1202                                 this.parentNode.removeChild( this );
1203                 }
1204         },
1205
1206         empty: function() {
1207                 // Remove element nodes and prevent memory leaks
1208                 jQuery( ">*", this ).remove();
1209
1210                 // Remove any remaining nodes
1211                 while ( this.firstChild )
1212                         this.removeChild( this.firstChild );
1213         }
1214 }, function(name, fn){
1215         jQuery.fn[ name ] = function(){
1216                 return this.each( fn, arguments );
1217         };
1218 });
1219
1220 // Helper function used by the dimensions and offset modules
1221 function num(elem, prop) {
1222         return elem[0] && parseInt( jQuery.curCSS(elem[0], prop, true), 10 ) || 0;
1223 }