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