src/ajax.js

   1 (function( jQuery ) {
   2
   3 var r20 = /%20/g,
   4         rbracket = /\[\]$/,
   5         rCRLF = /\r?\n/g,
   6         rhash = /#.*$/,
   7         rheaders = /^(.*?):\s*(.*?)\r?$/mg, // IE leaves an \r character at EOL
   8         rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
   9         rnoContent = /^(?:GET|HEAD)$/,
  10         rquery = /\?/,
  11         rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
  12         rselectTextarea = /^(?:select|textarea)/i,
  13         rspacesAjax = /\s+/,
  14         rts = /([?&])_=[^&]*/,
  15         rurl = /^(\w+:)?\/\/([^\/?#:]+)(?::(\d+))?/,
  16
  17         // Slice function
  18         sliceFunc = Array.prototype.slice,
  19
  20         // Keep a copy of the old load method
  21         _load = jQuery.fn.load,
  22
  23         /* Prefilters
  24          * 1) They are useful to introduce custom dataTypes (see ajax/jsonp.js for an example)
  25          * 2) These are called:
  26          *    - BEFORE asking for a transport
  27          *    - AFTER param serialization (s.data is a string if s.processData is true)
  28          * 3) key is the dataType
  29          * 4) the catchall symbol "*" can be used
  30          * 5) execution will start with transport dataType and THEN continue down to "*" if needed
  31          */
  32         prefilters = {},
  33
  34         /* Transports bindings
  35          * 1) key is the dataType
  36          * 2) the catchall symbol "*" can be used
  37          * 3) selection will start with transport dataType and THEN go to "*" if needed
  38          */
  39         transports = {};
  40
  41 // Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
  42 function addToPrefiltersOrTransports( structure ) {
  43
  44         // dataTypeExpression is optional and defaults to "*"
  45         return function( dataTypeExpression, func ) {
  46
  47                 if ( typeof dataTypeExpression !== "string" ) {
  48                         func = dataTypeExpression;
  49                         dataTypeExpression = "*";
  50                 }
  51
  52                 if ( jQuery.isFunction( func ) ) {
  53                         var dataTypes = dataTypeExpression.split( rspacesAjax ),
  54                                 i = 0,
  55                                 length = dataTypes.length,
  56                                 dataType,
  57                                 list,
  58                                 placeBefore;
  59
  60                         // For each dataType in the dataTypeExpression
  61                         for(; i < length; i++ ) {
  62                                 dataType = dataTypes[ i ];
  63                                 // We control if we're asked to add before
  64                                 // any existing element
  65                                 placeBefore = /^\+/.test( dataType );
  66                                 if ( placeBefore ) {
  67                                         dataType = dataType.substr( 1 );
  68                                 }
  69                                 list = structure[ dataType ] = structure[ dataType ] || [];
  70                                 // then we add to the structure accordingly
  71                                 list[ placeBefore ? "unshift" : "push" ]( func );
  72                         }
  73                 }
  74         };
  75 }
  76
  77 //Base inspection function for prefilters and transports
  78 function inspectPrefiltersOrTransports( structure, options, originalOptions,
  79                 dataType /* internal */, inspected /* internal */ ) {
  80
  81         dataType = dataType || options.dataTypes[ 0 ];
  82         inspected = inspected || {};
  83
  84         inspected[ dataType ] = true;
  85
  86         var list = structure[ dataType ],
  87                 i = 0,
  88                 length = list ? list.length : 0,
  89                 executeOnly = ( structure === prefilters ),
  90                 selection;
  91
  92         for(; i < length && ( executeOnly || !selection ); i++ ) {
  93                 selection = list[ i ]( options, originalOptions );
  94                 // If we got redirected to another dataType
  95                 // we try there if not done already
  96                 if ( typeof selection === "string" ) {
  97                         if ( inspected[ selection ] ) {
  98                                 selection = undefined;
  99                         } else {
 100                                 options.dataTypes.unshift( selection );
 101                                 selection = inspectPrefiltersOrTransports(
 102                                                 structure, options, originalOptions, selection, inspected );
 103                         }
 104                 }
 105         }
 106         // If we're only executing or nothing was selected
 107         // we try the catchall dataType if not done already
 108         if ( ( executeOnly || !selection ) && !inspected[ "*" ] ) {
 109                 selection = inspectPrefiltersOrTransports(
 110                                 structure, options, originalOptions, "*", inspected );
 111         }
 112         // unnecessary when only executing (prefilters)
 113         // but it'll be ignored by the caller in that case
 114         return selection;
 115 }
 116
 117 jQuery.fn.extend({
 118         load: function( url, params, callback ) {
 119                 if ( typeof url !== "string" && _load ) {
 120                         return _load.apply( this, arguments );
 121
 122                 // Don't do a request if no elements are being requested
 123                 } else if ( !this.length ) {
 124                         return this;
 125                 }
 126
 127                 var off = url.indexOf( " " );
 128                 if ( off >= 0 ) {
 129                         var selector = url.slice( off, url.length );
 130                         url = url.slice( 0, off );
 131                 }
 132
 133                 // Default to a GET request
 134                 var type = "GET";
 135
 136                 // If the second parameter was provided
 137                 if ( params ) {
 138                         // If it's a function
 139                         if ( jQuery.isFunction( params ) ) {
 140                                 // We assume that it's the callback
 141                                 callback = params;
 142                                 params = null;
 143
 144                         // Otherwise, build a param string
 145                         } else if ( typeof params === "object" ) {
 146                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
 147                                 type = "POST";
 148                         }
 149                 }
 150
 151                 var self = this;
 152
 153                 // Request the remote document
 154                 jQuery.ajax({
 155                         url: url,
 156                         type: type,
 157                         dataType: "html",
 158                         data: params,
 159                         // Complete callback (responseText is used internally)
 160                         complete: function( jXHR, status, responseText ) {
 161                                 // Store the response as specified by the jXHR object
 162                                 responseText = jXHR.responseText;
 163                                 // If successful, inject the HTML into all the matched elements
 164                                 if ( jXHR.isResolved() ) {
 165                                         // #4825: Get the actual response in case
 166                                         // a dataFilter is present in ajaxSettings
 167                                         jXHR.done(function( r ) {
 168                                                 responseText = r;
 169                                         });
 170                                         // See if a selector was specified
 171                                         self.html( selector ?
 172                                                 // Create a dummy div to hold the results
 173                                                 jQuery("<div>")
 174                                                         // inject the contents of the document in, removing the scripts
 175                                                         // to avoid any 'Permission Denied' errors in IE
 176                                                         .append(responseText.replace(rscript, ""))
 177
 178                                                         // Locate the specified elements
 179                                                         .find(selector) :
 180
 181                                                 // If not, just inject the full result
 182                                                 responseText );
 183                                 }
 184
 185                                 if ( callback ) {
 186                                         self.each( callback, [ responseText, status, jXHR ] );
 187                                 }
 188                         }
 189                 });
 190
 191                 return this;
 192         },
 193
 194         serialize: function() {
 195                 return jQuery.param( this.serializeArray() );
 196         },
 197
 198         serializeArray: function() {
 199                 return this.map(function(){
 200                         return this.elements ? jQuery.makeArray( this.elements ) : this;
 201                 })
 202                 .filter(function(){
 203                         return this.name && !this.disabled &&
 204                                 ( this.checked || rselectTextarea.test( this.nodeName ) ||
 205                                         rinput.test( this.type ) );
 206                 })
 207                 .map(function( i, elem ){
 208                         var val = jQuery( this ).val();
 209
 210                         return val == null ?
 211                                 null :
 212                                 jQuery.isArray( val ) ?
 213                                         jQuery.map( val, function( val, i ){
 214                                                 return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 215                                         }) :
 216                                         { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 217                 }).get();
 218         }
 219 });
 220
 221 // Attach a bunch of functions for handling common AJAX events
 222 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split( " " ), function( i, o ){
 223         jQuery.fn[ o ] = function( f ){
 224                 return this.bind( o, f );
 225         };
 226 } );
 227
 228 jQuery.each( [ "get", "post" ], function( i, method ) {
 229         jQuery[ method ] = function( url, data, callback, type ) {
 230                 // shift arguments if data argument was omitted
 231                 if ( jQuery.isFunction( data ) ) {
 232                         type = type || callback;
 233                         callback = data;
 234                         data = null;
 235                 }
 236
 237                 return jQuery.ajax({
 238                         type: method,
 239                         url: url,
 240                         data: data,
 241                         success: callback,
 242                         dataType: type
 243                 });
 244         };
 245 } );
 246
 247 jQuery.extend({
 248
 249         getScript: function( url, callback ) {
 250                 return jQuery.get( url, null, callback, "script" );
 251         },
 252
 253         getJSON: function( url, data, callback ) {
 254                 return jQuery.get( url, data, callback, "json" );
 255         },
 256
 257         ajaxSetup: function( settings ) {
 258                 jQuery.extend( true, jQuery.ajaxSettings, settings );
 259                 if ( settings.context ) {
 260                         jQuery.ajaxSettings.context = settings.context;
 261                 }
 262         },
 263
 264         ajaxSettings: {
 265                 url: location.href,
 266                 global: true,
 267                 type: "GET",
 268                 contentType: "application/x-www-form-urlencoded",
 269                 processData: true,
 270                 async: true,
 271                 /*
 272                 timeout: 0,
 273                 data: null,
 274                 dataType: null,
 275                 username: null,
 276                 password: null,
 277                 cache: null,
 278                 traditional: false,
 279                 headers: {},
 280                 crossDomain: null,
 281                 */
 282
 283                 accepts: {
 284                         xml: "application/xml, text/xml",
 285                         html: "text/html",
 286                         text: "text/plain",
 287                         json: "application/json, text/javascript",
 288                         "*": "*/*"
 289                 },
 290
 291                 contents: {
 292                         xml: /xml/,
 293                         html: /html/,
 294                         json: /json/
 295                 },
 296
 297                 responseFields: {
 298                         xml: "responseXML",
 299                         text: "responseText"
 300                 },
 301
 302                 // List of data converters
 303                 // 1) key format is "source_type destination_type" (a single space in-between)
 304                 // 2) the catchall symbol "*" can be used for source_type
 305                 converters: {
 306
 307                         // Convert anything to text
 308                         "* text": window.String,
 309
 310                         // Text to html (true = no transformation)
 311                         "text html": true,
 312
 313                         // Evaluate text as a json expression
 314                         "text json": jQuery.parseJSON,
 315
 316                         // Parse text as xml
 317                         "text xml": jQuery.parseXML
 318                 }
 319         },
 320
 321         ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
 322         ajaxTransport: addToPrefiltersOrTransports( transports ),
 323
 324         // Main method
 325         ajax: function( url, options ) {
 326
 327                 // If options is not an object,
 328                 // we simulate pre-1.5 signature
 329                 if ( typeof options !== "object" ) {
 330                         options = url;
 331                         url = undefined;
 332                 }
 333
 334                 // Force options to be an object
 335                 options = options || {};
 336
 337                 var // Create the final options object
 338                         s = jQuery.extend( true, {}, jQuery.ajaxSettings, options ),
 339                         // Callbacks contexts
 340                         // We force the original context if it exists
 341                         // or take it from jQuery.ajaxSettings otherwise
 342                         // (plain objects used as context get extended)
 343                         callbackContext =
 344                                 ( s.context = ( "context" in options ? options : jQuery.ajaxSettings ).context ) || s,
 345                         globalEventContext = callbackContext === s ? jQuery.event : jQuery( callbackContext ),
 346                         // Deferreds
 347                         deferred = jQuery.Deferred(),
 348                         completeDeferred = jQuery._Deferred(),
 349                         // Status-dependent callbacks
 350                         statusCode = s.statusCode || {},
 351                         // Headers (they are sent all at once)
 352                         requestHeaders = {},
 353                         // Response headers
 354                         responseHeadersString,
 355                         responseHeaders,
 356                         // transport
 357                         transport,
 358                         // timeout handle
 359                         timeoutTimer,
 360                         // Cross-domain detection vars
 361                         loc = document.location,
 362                         protocol = loc.protocol || "http:",
 363                         parts,
 364                         // The jXHR state
 365                         state = 0,
 366                         // Loop variable
 367                         i,
 368                         // Fake xhr
 369                         jXHR = {
 370
 371                                 readyState: 0,
 372
 373                                 // Caches the header
 374                                 setRequestHeader: function( name, value ) {
 375                                         if ( state === 0 ) {
 376                                                 requestHeaders[ name.toLowerCase() ] = value;
 377                                         }
 378                                         return this;
 379                                 },
 380
 381                                 // Raw string
 382                                 getAllResponseHeaders: function() {
 383                                         return state === 2 ? responseHeadersString : null;
 384                                 },
 385
 386                                 // Builds headers hashtable if needed
 387                                 getResponseHeader: function( key ) {
 388                                         var match;
 389                                         if ( state === 2 ) {
 390                                                 if ( !responseHeaders ) {
 391                                                         responseHeaders = {};
 392                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 393                                                                 responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
 394                                                         }
 395                                                 }
 396                                                 match = responseHeaders[ key.toLowerCase() ];
 397                                         }
 398                                         return match || null;
 399                                 },
 400
 401                                 // Cancel the request
 402                                 abort: function( statusText ) {
 403                                         statusText = statusText || "abort";
 404                                         if ( transport ) {
 405                                                 transport.abort( statusText );
 406                                         }
 407                                         done( 0, statusText );
 408                                         return this;
 409                                 }
 410                         };
 411
 412                 // Callback for when everything is done
 413                 // It is defined here because jslint complains if it is declared
 414                 // at the end of the function (which would be more logical and readable)
 415                 function done( status, statusText, responses, headers) {
 416
 417                         // Called once
 418                         if ( state === 2 ) {
 419                                 return;
 420                         }
 421
 422                         // State is "done" now
 423                         state = 2;
 424
 425                         // Clear timeout if it exists
 426                         if ( timeoutTimer ) {
 427                                 clearTimeout( timeoutTimer );
 428                         }
 429
 430                         // Dereference transport for early garbage collection
 431                         // (no matter how long the jXHR object will be used)
 432                         transport = undefined;
 433
 434                         // Cache response headers
 435                         responseHeadersString = headers || "";
 436
 437                         // Set readyState
 438                         jXHR.readyState = status ? 4 : 0;
 439
 440                         var isSuccess,
 441                                 success,
 442                                 error,
 443                                 response = responses ? ajaxHandleResponses( s, jXHR, responses ) : undefined,
 444                                 lastModified,
 445                                 etag;
 446
 447                         // If successful, handle type chaining
 448                         if ( status >= 200 && status < 300 || status === 304 ) {
 449
 450                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 451                                 if ( s.ifModified ) {
 452
 453                                         if ( ( lastModified = jXHR.getResponseHeader( "Last-Modified" ) ) ) {
 454                                                 jQuery.lastModified[ s.url ] = lastModified;
 455                                         }
 456                                         if ( ( etag = jXHR.getResponseHeader( "Etag" ) ) ) {
 457                                                 jQuery.etag[ s.url ] = etag;
 458                                         }
 459                                 }
 460
 461                                 // If not modified
 462                                 if ( status === 304 ) {
 463
 464                                         statusText = "notmodified";
 465                                         isSuccess = true;
 466
 467                                 // If we have data
 468                                 } else {
 469
 470                                         try {
 471                                                 success = ajaxConvert( s, response );
 472                                                 statusText = "success";
 473                                                 isSuccess = true;
 474                                         } catch(e) {
 475                                                 // We have a parsererror
 476                                                 statusText = "parsererror";
 477                                                 error = "" + e;
 478                                         }
 479                                 }
 480                         } else {
 481                                 // We extract error from statusText
 482                                 // then normalize statusText and status for non-aborts
 483                                 error = statusText;
 484                                 if( status ) {
 485                                         statusText = "error";
 486                                         if ( status < 0 ) {
 487                                                 status = 0;
 488                                         }
 489                                 }
 490                         }
 491
 492                         // Set data for the fake xhr object
 493                         jXHR.status = status;
 494                         jXHR.statusText = statusText;
 495
 496                         // Success/Error
 497                         if ( isSuccess ) {
 498                                 deferred.resolveWith( callbackContext, [ success, statusText, jXHR ] );
 499                         } else {
 500                                 deferred.rejectWith( callbackContext, [ jXHR, statusText, error ] );
 501                         }
 502
 503                         // Status-dependent callbacks
 504                         jXHR.statusCode( statusCode );
 505                         statusCode = undefined;
 506
 507                         if ( s.global ) {
 508                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ),
 509                                                 [ jXHR, s, isSuccess ? success : error ] );
 510                         }
 511
 512                         // Complete
 513                         completeDeferred.resolveWith( callbackContext, [ jXHR, statusText ] );
 514
 515                         if ( s.global ) {
 516                                 globalEventContext.trigger( "ajaxComplete", [ jXHR, s] );
 517                                 // Handle the global AJAX counter
 518                                 if ( !( --jQuery.active ) ) {
 519                                         jQuery.event.trigger( "ajaxStop" );
 520                                 }
 521                         }
 522                 }
 523
 524                 // Attach deferreds
 525                 deferred.promise( jXHR );
 526                 jXHR.success = jXHR.done;
 527                 jXHR.error = jXHR.fail;
 528                 jXHR.complete = completeDeferred.done;
 529
 530                 // Status-dependent callbacks
 531                 jXHR.statusCode = function( map ) {
 532                         if ( map ) {
 533                                 var tmp;
 534                                 if ( state < 2 ) {
 535                                         for( tmp in map ) {
 536                                                 statusCode[ tmp ] = [ statusCode[tmp], map[tmp] ];
 537                                         }
 538                                 } else {
 539                                         tmp = map[ jXHR.status ];
 540                                         jXHR.then( tmp, tmp );
 541                                 }
 542                         }
 543                         return this;
 544                 };
 545
 546                 // Remove hash character (#7531: and string promotion)
 547                 // We also use the url parameter if available
 548                 s.url = ( "" + ( url || s.url ) ).replace( rhash, "" );
 549
 550                 // Extract dataTypes list
 551                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
 552
 553                 // Determine if a cross-domain request is in order
 554                 if ( !s.crossDomain ) {
 555                         parts = rurl.exec( s.url.toLowerCase() );
 556                         s.crossDomain = !!(
 557                                         parts &&
 558                                         ( parts[ 1 ] && parts[ 1 ] != protocol ||
 559                                                 parts[ 2 ] != loc.hostname ||
 560                                                 ( parts[ 3 ] || ( ( parts[ 1 ] || protocol ) === "http:" ? 80 : 443 ) ) !=
 561                                                         ( loc.port || ( protocol === "http:" ? 80 : 443 ) ) )
 562                         );
 563                 }
 564
 565                 // Convert data if not already a string
 566                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 567                         s.data = jQuery.param( s.data, s.traditional );
 568                 }
 569
 570                 // Apply prefilters
 571                 inspectPrefiltersOrTransports( prefilters, s, options );
 572
 573                 // Uppercase the type
 574                 s.type = s.type.toUpperCase();
 575
 576                 // Determine if request has content
 577                 s.hasContent = !rnoContent.test( s.type );
 578
 579                 // Watch for a new set of requests
 580                 if ( s.global && jQuery.active++ === 0 ) {
 581                         jQuery.event.trigger( "ajaxStart" );
 582                 }
 583
 584                 // More options handling for requests with no content
 585                 if ( !s.hasContent ) {
 586
 587                         // If data is available, append data to url
 588                         if ( s.data ) {
 589                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 590                         }
 591
 592                         // Add anti-cache in url if needed
 593                         if ( s.cache === false ) {
 594
 595                                 var ts = jQuery.now(),
 596                                         // try replacing _= if it is there
 597                                         ret = s.url.replace( rts, "$1_=" + ts );
 598
 599                                 // if nothing was replaced, add timestamp to the end
 600                                 s.url = ret + ( (ret === s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "" );
 601                         }
 602                 }
 603
 604                 // Set the correct header, if data is being sent
 605                 if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 606                         requestHeaders[ "content-type" ] = s.contentType;
 607                 }
 608
 609                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 610                 if ( s.ifModified ) {
 611                         if ( jQuery.lastModified[ s.url ] ) {
 612                                 requestHeaders[ "if-modified-since" ] = jQuery.lastModified[ s.url ];
 613                         }
 614                         if ( jQuery.etag[ s.url ] ) {
 615                                 requestHeaders[ "if-none-match" ] = jQuery.etag[ s.url ];
 616                         }
 617                 }
 618
 619                 // Set the Accepts header for the server, depending on the dataType
 620                 requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
 621                         s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 622                         s.accepts[ "*" ];
 623
 624                 // Check for headers option
 625                 for ( i in s.headers ) {
 626                         requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
 627                 }
 628
 629                 // Allow custom headers/mimetypes and early abort
 630                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jXHR, s ) === false || state === 2 ) ) {
 631                                 // Abort if not done already
 632                                 done( 0, "abort" );
 633                                 // Return false
 634                                 jXHR = false;
 635
 636                 } else {
 637
 638                         // Install callbacks on deferreds
 639                         for ( i in { success: 1, error: 1, complete: 1 } ) {
 640                                 jXHR[ i ]( s[ i ] );
 641                         }
 642
 643                         // Get transport
 644                         transport = inspectPrefiltersOrTransports( transports, s, options );
 645
 646                         // If no transport, we auto-abort
 647                         if ( !transport ) {
 648                                 done( -1, "No Transport" );
 649                         } else {
 650                                 // Set state as sending
 651                                 state = jXHR.readyState = 1;
 652                                 // Send global event
 653                                 if ( s.global ) {
 654                                         globalEventContext.trigger( "ajaxSend", [ jXHR, s ] );
 655                                 }
 656                                 // Timeout
 657                                 if ( s.async && s.timeout > 0 ) {
 658                                         timeoutTimer = setTimeout( function(){
 659                                                 jXHR.abort( "timeout" );
 660                                         }, s.timeout );
 661                                 }
 662
 663                                 try {
 664                                         transport.send( requestHeaders, done );
 665                                 } catch (e) {
 666                                         // Propagate exception as error if not done
 667                                         if ( status < 2 ) {
 668                                                 done( -1, "" + e );
 669                                         // Simply rethrow otherwise
 670                                         } else {
 671                                                 jQuery.error( e );
 672                                         }
 673                                 }
 674                         }
 675                 }
 676                 return jXHR;
 677         },
 678
 679         // Serialize an array of form elements or a set of
 680         // key/values into a query string
 681         param: function( a, traditional ) {
 682                 var s = [],
 683                         add = function( key, value ) {
 684                                 // If value is a function, invoke it and return its value
 685                                 value = jQuery.isFunction( value ) ? value() : value;
 686                                 s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
 687                         };
 688
 689                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 690                 if ( traditional === undefined ) {
 691                         traditional = jQuery.ajaxSettings.traditional;
 692                 }
 693
 694                 // If an array was passed in, assume that it is an array of form elements.
 695                 if ( jQuery.isArray( a ) || a.jquery ) {
 696                         // Serialize the form elements
 697                         jQuery.each( a, function() {
 698                                 add( this.name, this.value );
 699                         } );
 700
 701                 } else {
 702                         // If traditional, encode the "old" way (the way 1.3.2 or older
 703                         // did it), otherwise encode params recursively.
 704                         for ( var prefix in a ) {
 705                                 buildParams( prefix, a[ prefix ], traditional, add );
 706                         }
 707                 }
 708
 709                 // Return the resulting serialization
 710                 return s.join( "&" ).replace( r20, "+" );
 711         }
 712 });
 713
 714 function buildParams( prefix, obj, traditional, add ) {
 715         if ( jQuery.isArray( obj ) && obj.length ) {
 716                 // Serialize array item.
 717                 jQuery.each( obj, function( i, v ) {
 718                         if ( traditional || rbracket.test( prefix ) ) {
 719                                 // Treat each array item as a scalar.
 720                                 add( prefix, v );
 721
 722                         } else {
 723                                 // If array item is non-scalar (array or object), encode its
 724                                 // numeric index to resolve deserialization ambiguity issues.
 725                                 // Note that rack (as of 1.0.0) can't currently deserialize
 726                                 // nested arrays properly, and attempting to do so may cause
 727                                 // a server error. Possible fixes are to modify rack's
 728                                 // deserialization algorithm or to provide an option or flag
 729                                 // to force array serialization to be shallow.
 730                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 731                         }
 732                 });
 733
 734         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 735                 // If we see an array here, it is empty and should be treated as an empty
 736                 // object
 737                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 738                         add( prefix, "" );
 739
 740                 // Serialize object item.
 741                 } else {
 742                         jQuery.each( obj, function( k, v ) {
 743                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 744                         });
 745                 }
 746
 747         } else {
 748                 // Serialize scalar item.
 749                 add( prefix, obj );
 750         }
 751 }
 752
 753 // This is still on the jQuery object... for now
 754 // Want to move this to jQuery.ajax some day
 755 jQuery.extend({
 756
 757         // Counter for holding the number of active queries
 758         active: 0,
 759
 760         // Last-Modified header cache for next request
 761         lastModified: {},
 762         etag: {}
 763
 764 });
 765
 766 /* Handles responses to an ajax request:
 767  * - sets all responseXXX fields accordingly
 768  * - finds the right dataType (mediates between content-type and expected dataType)
 769  * - returns the corresponding response
 770  */
 771 function ajaxHandleResponses( s, jXHR, responses ) {
 772
 773         var contents = s.contents,
 774                 dataTypes = s.dataTypes,
 775                 responseFields = s.responseFields,
 776                 ct,
 777                 type,
 778                 finalDataType,
 779                 firstDataType;
 780
 781         // Fill responseXXX fields
 782         for( type in responseFields ) {
 783                 if ( type in responses ) {
 784                         jXHR[ responseFields[type] ] = responses[ type ];
 785                 }
 786         }
 787
 788         // Remove auto dataType and get content-type in the process
 789         while( dataTypes[ 0 ] === "*" ) {
 790                 dataTypes.shift();
 791                 if ( ct === undefined ) {
 792                         ct = jXHR.getResponseHeader( "content-type" );
 793                 }
 794         }
 795
 796         // Check if we're dealing with a known content-type
 797         if ( ct ) {
 798                 for ( type in contents ) {
 799                         if ( contents[ type ] && contents[ type ].test( ct ) ) {
 800                                 dataTypes.unshift( type );
 801                                 break;
 802                         }
 803                 }
 804         }
 805
 806         // Check to see if we have a response for the expected dataType
 807         if ( dataTypes[ 0 ] in responses ) {
 808                 finalDataType = dataTypes[ 0 ];
 809         } else {
 810                 // Try convertible dataTypes
 811                 for ( type in responses ) {
 812                         if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
 813                                 finalDataType = type;
 814                                 break;
 815                         }
 816                         if ( !firstDataType ) {
 817                                 firstDataType = type;
 818                         }
 819                 }
 820                 // Or just use first one
 821                 finalDataType = finalDataType || firstDataType;
 822         }
 823
 824         // If we found a dataType
 825         // We add the dataType to the list if needed
 826         // and return the corresponding response
 827         if ( finalDataType ) {
 828                 if ( finalDataType !== dataTypes[ 0 ] ) {
 829                         dataTypes.unshift( finalDataType );
 830                 }
 831                 return responses[ finalDataType ];
 832         }
 833 }
 834
 835 // Chain conversions given the request and the original response
 836 function ajaxConvert( s, response ) {
 837
 838         // Apply the dataFilter if provided
 839         if ( s.dataFilter ) {
 840                 response = s.dataFilter( response, s.dataType );
 841         }
 842
 843         var dataTypes = s.dataTypes,
 844                 converters = s.converters,
 845                 i,
 846                 length = dataTypes.length,
 847                 tmp,
 848                 // Current and previous dataTypes
 849                 current = dataTypes[ 0 ],
 850                 prev,
 851                 // Conversion expression
 852                 conversion,
 853                 // Conversion function
 854                 conv,
 855                 // Conversion functions (when text is used in-between)
 856                 conv1,
 857                 conv2;
 858
 859         // For each dataType in the chain
 860         for( i = 1; i < length; i++ ) {
 861
 862                 // Get the dataTypes
 863                 prev = current;
 864                 current = dataTypes[ i ];
 865
 866                 // If current is auto dataType, update it to prev
 867                 if( current === "*" ) {
 868                         current = prev;
 869                 // If no auto and dataTypes are actually different
 870                 } else if ( prev !== "*" && prev !== current ) {
 871
 872                         // Get the converter
 873                         conversion = prev + " " + current;
 874                         conv = converters[ conversion ] || converters[ "* " + current ];
 875
 876                         // If there is no direct converter, search transitively
 877                         if ( !conv ) {
 878                                 conv2 = undefined;
 879                                 for( conv1 in converters ) {
 880                                         tmp = conv1.split( " " );
 881                                         if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
 882                                                 conv2 = converters[ tmp[1] + " " + current ];
 883                                                 if ( conv2 ) {
 884                                                         conv1 = converters[ conv1 ];
 885                                                         if ( conv1 === true ) {
 886                                                                 conv = conv2;
 887                                                         } else if ( conv2 === true ) {
 888                                                                 conv = conv1;
 889                                                         }
 890                                                         break;
 891                                                 }
 892                                         }
 893                                 }
 894                         }
 895                         // If we found no converter, dispatch an error
 896                         if ( !( conv || conv2 ) ) {
 897                                 jQuery.error( "No conversion from " + conversion.replace(" "," to ") );
 898                         }
 899                         // If found converter is not an equivalence
 900                         if ( conv !== true ) {
 901                                 // Convert with 1 or 2 converters accordingly
 902                                 response = conv ? conv( response ) : conv2( conv1(response) );
 903                         }
 904                 }
 905         }
 906         return response;
 907 }
 908
 909 })( jQuery );