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                                         if ( transport ) {
 404                                                 transport.abort( statusText || "abort" );
 405                                         }
 406                                         done( 0, statusText );
 407                                         return this;
 408                                 }
 409                         };
 410
 411                 // Callback for when everything is done
 412                 // It is defined here because jslint complains if it is declared
 413                 // at the end of the function (which would be more logical and readable)
 414                 function done( status, statusText, responses, headers) {
 415
 416                         // Called once
 417                         if ( state === 2 ) {
 418                                 return;
 419                         }
 420
 421                         // State is "done" now
 422                         state = 2;
 423
 424                         // Clear timeout if it exists
 425                         if ( timeoutTimer ) {
 426                                 clearTimeout( timeoutTimer );
 427                         }
 428
 429                         // Dereference transport for early garbage collection
 430                         // (no matter how long the jXHR object will be used)
 431                         transport = undefined;
 432
 433                         // Cache response headers
 434                         responseHeadersString = headers || "";
 435
 436                         // Set readyState
 437                         jXHR.readyState = status ? 4 : 0;
 438
 439                         var isSuccess,
 440                                 success,
 441                                 error = ( statusText = statusText || "error" ),
 442                                 response = responses ? ajaxHandleResponses( s, jXHR, responses ) : undefined,
 443                                 lastModified,
 444                                 etag;
 445
 446                         // If successful, handle type chaining
 447                         if ( status >= 200 && status < 300 || status === 304 ) {
 448
 449                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 450                                 if ( s.ifModified ) {
 451
 452                                         if ( ( lastModified = jXHR.getResponseHeader( "Last-Modified" ) ) ) {
 453                                                 jQuery.lastModified[ s.url ] = lastModified;
 454                                         }
 455                                         if ( ( etag = jXHR.getResponseHeader( "Etag" ) ) ) {
 456                                                 jQuery.etag[ s.url ] = etag;
 457                                         }
 458                                 }
 459
 460                                 // If not modified
 461                                 if ( status === 304 ) {
 462
 463                                         statusText = "notmodified";
 464                                         isSuccess = true;
 465
 466                                 // If we have data
 467                                 } else {
 468
 469                                         try {
 470                                                 success = ajaxConvert( s, response );
 471                                                 statusText = "success";
 472                                                 isSuccess = true;
 473                                         } catch(e) {
 474                                                 // We have a parsererror
 475                                                 statusText = "parsererror";
 476                                                 error = "" + e;
 477                                         }
 478                                 }
 479                         }
 480
 481                         // Set data for the fake xhr object
 482                         jXHR.status = status;
 483                         jXHR.statusText = statusText;
 484
 485                         // Success/Error
 486                         if ( isSuccess ) {
 487                                 deferred.resolveWith( callbackContext, [ success, statusText, jXHR ] );
 488                         } else {
 489                                 deferred.rejectWith( callbackContext, [ jXHR, statusText, error ] );
 490                         }
 491
 492                         // Status-dependent callbacks
 493                         jXHR.statusCode( statusCode );
 494                         statusCode = undefined;
 495
 496                         if ( s.global ) {
 497                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ),
 498                                                 [ jXHR, s, isSuccess ? success : error ] );
 499                         }
 500
 501                         // Complete
 502                         completeDeferred.resolveWith( callbackContext, [ jXHR, statusText ] );
 503
 504                         if ( s.global ) {
 505                                 globalEventContext.trigger( "ajaxComplete", [ jXHR, s] );
 506                                 // Handle the global AJAX counter
 507                                 if ( !( --jQuery.active ) ) {
 508                                         jQuery.event.trigger( "ajaxStop" );
 509                                 }
 510                         }
 511                 }
 512
 513                 // Attach deferreds
 514                 deferred.promise( jXHR );
 515                 jXHR.success = jXHR.done;
 516                 jXHR.error = jXHR.fail;
 517                 jXHR.complete = completeDeferred.done;
 518
 519                 // Status-dependent callbacks
 520                 jXHR.statusCode = function( map ) {
 521                         if ( map ) {
 522                                 var tmp;
 523                                 if ( state < 2 ) {
 524                                         for( tmp in map ) {
 525                                                 statusCode[ tmp ] = [ statusCode[tmp], map[tmp] ];
 526                                         }
 527                                 } else {
 528                                         tmp = map[ jXHR.status ];
 529                                         jXHR.then( tmp, tmp );
 530                                 }
 531                         }
 532                         return this;
 533                 };
 534
 535                 // Remove hash character (#7531: and string promotion)
 536                 // We also use the url parameter if available
 537                 s.url = ( "" + ( url || s.url ) ).replace( rhash, "" );
 538
 539                 // Extract dataTypes list
 540                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
 541
 542                 // Determine if a cross-domain request is in order
 543                 if ( !s.crossDomain ) {
 544                         parts = rurl.exec( s.url.toLowerCase() );
 545                         s.crossDomain = !!(
 546                                         parts &&
 547                                         ( parts[ 1 ] && parts[ 1 ] != protocol ||
 548                                                 parts[ 2 ] != loc.hostname ||
 549                                                 ( parts[ 3 ] || ( ( parts[ 1 ] || protocol ) === "http:" ? 80 : 443 ) ) !=
 550                                                         ( loc.port || ( protocol === "http:" ? 80 : 443 ) ) )
 551                         );
 552                 }
 553
 554                 // Convert data if not already a string
 555                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 556                         s.data = jQuery.param( s.data, s.traditional );
 557                 }
 558
 559                 // Apply prefilters
 560                 inspectPrefiltersOrTransports( prefilters, s, options );
 561
 562                 // Uppercase the type
 563                 s.type = s.type.toUpperCase();
 564
 565                 // Determine if request has content
 566                 s.hasContent = !rnoContent.test( s.type );
 567
 568                 // Watch for a new set of requests
 569                 if ( s.global && jQuery.active++ === 0 ) {
 570                         jQuery.event.trigger( "ajaxStart" );
 571                 }
 572
 573                 // More options handling for requests with no content
 574                 if ( !s.hasContent ) {
 575
 576                         // If data is available, append data to url
 577                         if ( s.data ) {
 578                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 579                         }
 580
 581                         // Add anti-cache in url if needed
 582                         if ( s.cache === false ) {
 583
 584                                 var ts = jQuery.now(),
 585                                         // try replacing _= if it is there
 586                                         ret = s.url.replace( rts, "$1_=" + ts );
 587
 588                                 // if nothing was replaced, add timestamp to the end
 589                                 s.url = ret + ( (ret === s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "" );
 590                         }
 591                 }
 592
 593                 // Set the correct header, if data is being sent
 594                 if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 595                         requestHeaders[ "content-type" ] = s.contentType;
 596                 }
 597
 598                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 599                 if ( s.ifModified ) {
 600                         if ( jQuery.lastModified[ s.url ] ) {
 601                                 requestHeaders[ "if-modified-since" ] = jQuery.lastModified[ s.url ];
 602                         }
 603                         if ( jQuery.etag[ s.url ] ) {
 604                                 requestHeaders[ "if-none-match" ] = jQuery.etag[ s.url ];
 605                         }
 606                 }
 607
 608                 // Set the Accepts header for the server, depending on the dataType
 609                 requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
 610                         s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 611                         s.accepts[ "*" ];
 612
 613                 // Check for headers option
 614                 for ( i in s.headers ) {
 615                         requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
 616                 }
 617
 618                 // Allow custom headers/mimetypes and early abort
 619                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jXHR, s ) === false || state === 2 ) ) {
 620                                 // Abort if not done already
 621                                 done( 0, "abort" );
 622                                 // Return false
 623                                 jXHR = false;
 624
 625                 } else {
 626
 627                         // Install callbacks on deferreds
 628                         for ( i in { success: 1, error: 1, complete: 1 } ) {
 629                                 jXHR[ i ]( s[ i ] );
 630                         }
 631
 632                         // Get transport
 633                         transport = inspectPrefiltersOrTransports( transports, s, options );
 634
 635                         // If no transport, we auto-abort
 636                         if ( !transport ) {
 637                                 done( 0, "notransport" );
 638                         } else {
 639                                 // Set state as sending
 640                                 state = jXHR.readyState = 1;
 641                                 // Send global event
 642                                 if ( s.global ) {
 643                                         globalEventContext.trigger( "ajaxSend", [ jXHR, s ] );
 644                                 }
 645                                 // Timeout
 646                                 if ( s.async && s.timeout > 0 ) {
 647                                         timeoutTimer = setTimeout( function(){
 648                                                 jXHR.abort( "timeout" );
 649                                         }, s.timeout );
 650                                 }
 651
 652                                 try {
 653                                         transport.send( requestHeaders, done );
 654                                 } catch (e) {
 655                                         // Propagate exception as error if not done
 656                                         if ( status === 1 ) {
 657                                                 done( 0, "error", "" + e );
 658                                                 jXHR = false;
 659                                         // Simply rethrow otherwise
 660                                         } else {
 661                                                 jQuery.error( e );
 662                                         }
 663                                 }
 664                         }
 665                 }
 666                 return jXHR;
 667         },
 668
 669         // Serialize an array of form elements or a set of
 670         // key/values into a query string
 671         param: function( a, traditional ) {
 672                 var s = [],
 673                         add = function( key, value ) {
 674                                 // If value is a function, invoke it and return its value
 675                                 value = jQuery.isFunction( value ) ? value() : value;
 676                                 s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
 677                         };
 678
 679                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 680                 if ( traditional === undefined ) {
 681                         traditional = jQuery.ajaxSettings.traditional;
 682                 }
 683
 684                 // If an array was passed in, assume that it is an array of form elements.
 685                 if ( jQuery.isArray( a ) || a.jquery ) {
 686                         // Serialize the form elements
 687                         jQuery.each( a, function() {
 688                                 add( this.name, this.value );
 689                         } );
 690
 691                 } else {
 692                         // If traditional, encode the "old" way (the way 1.3.2 or older
 693                         // did it), otherwise encode params recursively.
 694                         for ( var prefix in a ) {
 695                                 buildParams( prefix, a[ prefix ], traditional, add );
 696                         }
 697                 }
 698
 699                 // Return the resulting serialization
 700                 return s.join( "&" ).replace( r20, "+" );
 701         }
 702 });
 703
 704 function buildParams( prefix, obj, traditional, add ) {
 705         if ( jQuery.isArray( obj ) && obj.length ) {
 706                 // Serialize array item.
 707                 jQuery.each( obj, function( i, v ) {
 708                         if ( traditional || rbracket.test( prefix ) ) {
 709                                 // Treat each array item as a scalar.
 710                                 add( prefix, v );
 711
 712                         } else {
 713                                 // If array item is non-scalar (array or object), encode its
 714                                 // numeric index to resolve deserialization ambiguity issues.
 715                                 // Note that rack (as of 1.0.0) can't currently deserialize
 716                                 // nested arrays properly, and attempting to do so may cause
 717                                 // a server error. Possible fixes are to modify rack's
 718                                 // deserialization algorithm or to provide an option or flag
 719                                 // to force array serialization to be shallow.
 720                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 721                         }
 722                 });
 723
 724         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 725                 // If we see an array here, it is empty and should be treated as an empty
 726                 // object
 727                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 728                         add( prefix, "" );
 729
 730                 // Serialize object item.
 731                 } else {
 732                         jQuery.each( obj, function( k, v ) {
 733                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 734                         });
 735                 }
 736
 737         } else {
 738                 // Serialize scalar item.
 739                 add( prefix, obj );
 740         }
 741 }
 742
 743 // This is still on the jQuery object... for now
 744 // Want to move this to jQuery.ajax some day
 745 jQuery.extend({
 746
 747         // Counter for holding the number of active queries
 748         active: 0,
 749
 750         // Last-Modified header cache for next request
 751         lastModified: {},
 752         etag: {}
 753
 754 });
 755
 756 /* Handles responses to an ajax request:
 757  * - sets all responseXXX fields accordingly
 758  * - finds the right dataType (mediates between content-type and expected dataType)
 759  * - returns the corresponding response
 760  */
 761 function ajaxHandleResponses( s, jXHR, responses ) {
 762
 763         var contents = s.contents,
 764                 dataTypes = s.dataTypes,
 765                 responseFields = s.responseFields,
 766                 ct,
 767                 type,
 768                 finalDataType,
 769                 firstDataType;
 770
 771         // Fill responseXXX fields
 772         for( type in responseFields ) {
 773                 if ( type in responses ) {
 774                         jXHR[ responseFields[type] ] = responses[ type ];
 775                 }
 776         }
 777
 778         // Remove auto dataType and get content-type in the process
 779         while( dataTypes[ 0 ] === "*" ) {
 780                 dataTypes.shift();
 781                 if ( ct === undefined ) {
 782                         ct = jXHR.getResponseHeader( "content-type" );
 783                 }
 784         }
 785
 786         // Check if we're dealing with a known content-type
 787         if ( ct ) {
 788                 for ( type in contents ) {
 789                         if ( contents[ type ] && contents[ type ].test( ct ) ) {
 790                                 dataTypes.unshift( type );
 791                                 break;
 792                         }
 793                 }
 794         }
 795
 796         // Check to see if we have a response for the expected dataType
 797         if ( dataTypes[ 0 ] in responses ) {
 798                 finalDataType = dataTypes[ 0 ];
 799         } else {
 800                 // Try convertible dataTypes
 801                 for ( type in responses ) {
 802                         if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
 803                                 finalDataType = type;
 804                                 break;
 805                         }
 806                         if ( !firstDataType ) {
 807                                 firstDataType = type;
 808                         }
 809                 }
 810                 // Or just use first one
 811                 finalDataType = finalDataType || firstDataType;
 812         }
 813
 814         // If we found a dataType
 815         // We add the dataType to the list if needed
 816         // and return the corresponding response
 817         if ( finalDataType ) {
 818                 if ( finalDataType !== dataTypes[ 0 ] ) {
 819                         dataTypes.unshift( finalDataType );
 820                 }
 821                 return responses[ finalDataType ];
 822         }
 823 }
 824
 825 // Chain conversions given the request and the original response
 826 function ajaxConvert( s, response ) {
 827
 828         // Apply the dataFilter if provided
 829         if ( s.dataFilter ) {
 830                 response = s.dataFilter( response, s.dataType );
 831         }
 832
 833         var dataTypes = s.dataTypes,
 834                 converters = s.converters,
 835                 i,
 836                 length = dataTypes.length,
 837                 tmp,
 838                 // Current and previous dataTypes
 839                 current = dataTypes[ 0 ],
 840                 prev,
 841                 // Conversion expression
 842                 conversion,
 843                 // Conversion function
 844                 conv,
 845                 // Conversion functions (when text is used in-between)
 846                 conv1,
 847                 conv2;
 848
 849         // For each dataType in the chain
 850         for( i = 1; i < length; i++ ) {
 851
 852                 // Get the dataTypes
 853                 prev = current;
 854                 current = dataTypes[ i ];
 855
 856                 // If current is auto dataType, update it to prev
 857                 if( current === "*" ) {
 858                         current = prev;
 859                 // If no auto and dataTypes are actually different
 860                 } else if ( prev !== "*" && prev !== current ) {
 861
 862                         // Get the converter
 863                         conversion = prev + " " + current;
 864                         conv = converters[ conversion ] || converters[ "* " + current ];
 865
 866                         // If there is no direct converter, search transitively
 867                         if ( !conv ) {
 868                                 conv2 = undefined;
 869                                 for( conv1 in converters ) {
 870                                         tmp = conv1.split( " " );
 871                                         if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
 872                                                 conv2 = converters[ tmp[1] + " " + current ];
 873                                                 if ( conv2 ) {
 874                                                         conv1 = converters[ conv1 ];
 875                                                         if ( conv1 === true ) {
 876                                                                 conv = conv2;
 877                                                         } else if ( conv2 === true ) {
 878                                                                 conv = conv1;
 879                                                         }
 880                                                         break;
 881                                                 }
 882                                         }
 883                                 }
 884                         }
 885                         // If we found no converter, dispatch an error
 886                         if ( !( conv || conv2 ) ) {
 887                                 jQuery.error( "No conversion from " + conversion.replace(" "," to ") );
 888                         }
 889                         // If found converter is not an equivalence
 890                         if ( conv !== true ) {
 891                                 // Convert with 1 or 2 converters accordingly
 892                                 response = conv ? conv( response ) : conv2( conv1(response) );
 893                         }
 894                 }
 895         }
 896         return response;
 897 }
 898
 899 })( jQuery );