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         // #7653, #8125, #8152: local protocol detection
  10         rlocalProtocol = /(?:^file|^widget|\-extension):$/,
  11         rnoContent = /^(?:GET|HEAD)$/,
  12         rprotocol = /^\/\//,
  13         rquery = /\?/,
  14         rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
  15         rselectTextarea = /^(?:select|textarea)/i,
  16         rspacesAjax = /\s+/,
  17         rts = /([?&])_=[^&]*/,
  18         rucHeaders = /(^|\-)([a-z])/g,
  19         rucHeadersFunc = function( _, $1, $2 ) {
  20                 return $1 + $2.toUpperCase();
  21         },
  22         rurl = /^([\w\+\.\-]+:)\/\/([^\/?#:]*)(?::(\d+))?/,
  23
  24         // Keep a copy of the old load method
  25         _load = jQuery.fn.load,
  26
  27         /* Prefilters
  28          * 1) They are useful to introduce custom dataTypes (see ajax/jsonp.js for an example)
  29          * 2) These are called:
  30          *    - BEFORE asking for a transport
  31          *    - AFTER param serialization (s.data is a string if s.processData is true)
  32          * 3) key is the dataType
  33          * 4) the catchall symbol "*" can be used
  34          * 5) execution will start with transport dataType and THEN continue down to "*" if needed
  35          */
  36         prefilters = {},
  37
  38         /* Transports bindings
  39          * 1) key is the dataType
  40          * 2) the catchall symbol "*" can be used
  41          * 3) selection will start with transport dataType and THEN go to "*" if needed
  42          */
  43         transports = {},
  44
  45         // Document location
  46         ajaxLocation,
  47
  48         // Document location segments
  49         ajaxLocParts;
  50
  51 // #8138, IE may throw an exception when accessing
  52 // a field from document.location if document.domain has been set
  53 try {
  54         ajaxLocation = document.location.href;
  55 } catch( e ) {
  56         // Use the href attribute of an A element
  57         // since IE will modify it given document.location
  58         ajaxLocation = document.createElement( "a" );
  59         ajaxLocation.href = "";
  60         ajaxLocation = ajaxLocation.href;
  61 }
  62
  63 // Segment location into parts
  64 ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() );
  65
  66 // Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
  67 function addToPrefiltersOrTransports( structure ) {
  68
  69         // dataTypeExpression is optional and defaults to "*"
  70         return function( dataTypeExpression, func ) {
  71
  72                 if ( typeof dataTypeExpression !== "string" ) {
  73                         func = dataTypeExpression;
  74                         dataTypeExpression = "*";
  75                 }
  76
  77                 if ( jQuery.isFunction( func ) ) {
  78                         var dataTypes = dataTypeExpression.toLowerCase().split( rspacesAjax ),
  79                                 i = 0,
  80                                 length = dataTypes.length,
  81                                 dataType,
  82                                 list,
  83                                 placeBefore;
  84
  85                         // For each dataType in the dataTypeExpression
  86                         for(; i < length; i++ ) {
  87                                 dataType = dataTypes[ i ];
  88                                 // We control if we're asked to add before
  89                                 // any existing element
  90                                 placeBefore = /^\+/.test( dataType );
  91                                 if ( placeBefore ) {
  92                                         dataType = dataType.substr( 1 ) || "*";
  93                                 }
  94                                 list = structure[ dataType ] = structure[ dataType ] || [];
  95                                 // then we add to the structure accordingly
  96                                 list[ placeBefore ? "unshift" : "push" ]( func );
  97                         }
  98                 }
  99         };
 100 }
 101
 102 //Base inspection function for prefilters and transports
 103 function inspectPrefiltersOrTransports( structure, options, originalOptions, jqXHR,
 104                 dataType /* internal */, inspected /* internal */ ) {
 105
 106         dataType = dataType || options.dataTypes[ 0 ];
 107         inspected = inspected || {};
 108
 109         inspected[ dataType ] = true;
 110
 111         var list = structure[ dataType ],
 112                 i = 0,
 113                 length = list ? list.length : 0,
 114                 executeOnly = ( structure === prefilters ),
 115                 selection;
 116
 117         for(; i < length && ( executeOnly || !selection ); i++ ) {
 118                 selection = list[ i ]( options, originalOptions, jqXHR );
 119                 // If we got redirected to another dataType
 120                 // we try there if executing only and not done already
 121                 if ( typeof selection === "string" ) {
 122                         if ( !executeOnly || inspected[ selection ] ) {
 123                                 selection = undefined;
 124                         } else {
 125                                 options.dataTypes.unshift( selection );
 126                                 selection = inspectPrefiltersOrTransports(
 127                                                 structure, options, originalOptions, jqXHR, selection, inspected );
 128                         }
 129                 }
 130         }
 131         // If we're only executing or nothing was selected
 132         // we try the catchall dataType if not done already
 133         if ( ( executeOnly || !selection ) && !inspected[ "*" ] ) {
 134                 selection = inspectPrefiltersOrTransports(
 135                                 structure, options, originalOptions, jqXHR, "*", inspected );
 136         }
 137         // unnecessary when only executing (prefilters)
 138         // but it'll be ignored by the caller in that case
 139         return selection;
 140 }
 141
 142 jQuery.fn.extend({
 143         load: function( url, params, callback ) {
 144                 if ( typeof url !== "string" && _load ) {
 145                         return _load.apply( this, arguments );
 146
 147                 // Don't do a request if no elements are being requested
 148                 } else if ( !this.length ) {
 149                         return this;
 150                 }
 151
 152                 var off = url.indexOf( " " );
 153                 if ( off >= 0 ) {
 154                         var selector = url.slice( off, url.length );
 155                         url = url.slice( 0, off );
 156                 }
 157
 158                 // Default to a GET request
 159                 var type = "GET";
 160
 161                 // If the second parameter was provided
 162                 if ( params ) {
 163                         // If it's a function
 164                         if ( jQuery.isFunction( params ) ) {
 165                                 // We assume that it's the callback
 166                                 callback = params;
 167                                 params = null;
 168
 169                         // Otherwise, build a param string
 170                         } else if ( typeof params === "object" ) {
 171                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
 172                                 type = "POST";
 173                         }
 174                 }
 175
 176                 var self = this;
 177
 178                 // Request the remote document
 179                 jQuery.ajax({
 180                         url: url,
 181                         type: type,
 182                         dataType: "html",
 183                         data: params,
 184                         // Complete callback (responseText is used internally)
 185                         complete: function( jqXHR, status, responseText ) {
 186                                 // Store the response as specified by the jqXHR object
 187                                 responseText = jqXHR.responseText;
 188                                 // If successful, inject the HTML into all the matched elements
 189                                 if ( jqXHR.isResolved() ) {
 190                                         // #4825: Get the actual response in case
 191                                         // a dataFilter is present in ajaxSettings
 192                                         jqXHR.done(function( r ) {
 193                                                 responseText = r;
 194                                         });
 195                                         // See if a selector was specified
 196                                         self.html( selector ?
 197                                                 // Create a dummy div to hold the results
 198                                                 jQuery("<div>")
 199                                                         // inject the contents of the document in, removing the scripts
 200                                                         // to avoid any 'Permission Denied' errors in IE
 201                                                         .append(responseText.replace(rscript, ""))
 202
 203                                                         // Locate the specified elements
 204                                                         .find(selector) :
 205
 206                                                 // If not, just inject the full result
 207                                                 responseText );
 208                                 }
 209
 210                                 if ( callback ) {
 211                                         self.each( callback, [ responseText, status, jqXHR ] );
 212                                 }
 213                         }
 214                 });
 215
 216                 return this;
 217         },
 218
 219         serialize: function() {
 220                 return jQuery.param( this.serializeArray() );
 221         },
 222
 223         serializeArray: function() {
 224                 return this.map(function(){
 225                         return this.elements ? jQuery.makeArray( this.elements ) : this;
 226                 })
 227                 .filter(function(){
 228                         return this.name && !this.disabled &&
 229                                 ( this.checked || rselectTextarea.test( this.nodeName ) ||
 230                                         rinput.test( this.type ) );
 231                 })
 232                 .map(function( i, elem ){
 233                         var val = jQuery( this ).val();
 234
 235                         return val == null ?
 236                                 null :
 237                                 jQuery.isArray( val ) ?
 238                                         jQuery.map( val, function( val, i ){
 239                                                 return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 240                                         }) :
 241                                         { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 242                 }).get();
 243         }
 244 });
 245
 246 // Attach a bunch of functions for handling common AJAX events
 247 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split( " " ), function( i, o ){
 248         jQuery.fn[ o ] = function( f ){
 249                 return this.bind( o, f );
 250         };
 251 } );
 252
 253 jQuery.each( [ "get", "post" ], function( i, method ) {
 254         jQuery[ method ] = function( url, data, callback, type ) {
 255                 // shift arguments if data argument was omitted
 256                 if ( jQuery.isFunction( data ) ) {
 257                         type = type || callback;
 258                         callback = data;
 259                         data = null;
 260                 }
 261
 262                 return jQuery.ajax({
 263                         type: method,
 264                         url: url,
 265                         data: data,
 266                         success: callback,
 267                         dataType: type
 268                 });
 269         };
 270 } );
 271
 272 jQuery.extend({
 273
 274         getScript: function( url, callback ) {
 275                 return jQuery.get( url, null, callback, "script" );
 276         },
 277
 278         getJSON: function( url, data, callback ) {
 279                 return jQuery.get( url, data, callback, "json" );
 280         },
 281
 282         ajaxSetup: function( settings ) {
 283                 jQuery.extend( true, jQuery.ajaxSettings, settings );
 284                 if ( settings.context ) {
 285                         jQuery.ajaxSettings.context = settings.context;
 286                 }
 287         },
 288
 289         ajaxSettings: {
 290                 url: ajaxLocation,
 291                 isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ),
 292                 global: true,
 293                 type: "GET",
 294                 contentType: "application/x-www-form-urlencoded",
 295                 processData: true,
 296                 async: true,
 297                 /*
 298                 timeout: 0,
 299                 data: null,
 300                 dataType: null,
 301                 username: null,
 302                 password: null,
 303                 cache: null,
 304                 traditional: false,
 305                 headers: {},
 306                 crossDomain: null,
 307                 */
 308
 309                 accepts: {
 310                         xml: "application/xml, text/xml",
 311                         html: "text/html",
 312                         text: "text/plain",
 313                         json: "application/json, text/javascript",
 314                         "*": "*/*"
 315                 },
 316
 317                 contents: {
 318                         xml: /xml/,
 319                         html: /html/,
 320                         json: /json/
 321                 },
 322
 323                 responseFields: {
 324                         xml: "responseXML",
 325                         text: "responseText"
 326                 },
 327
 328                 // List of data converters
 329                 // 1) key format is "source_type destination_type" (a single space in-between)
 330                 // 2) the catchall symbol "*" can be used for source_type
 331                 converters: {
 332
 333                         // Convert anything to text
 334                         "* text": window.String,
 335
 336                         // Text to html (true = no transformation)
 337                         "text html": true,
 338
 339                         // Evaluate text as a json expression
 340                         "text json": jQuery.parseJSON,
 341
 342                         // Parse text as xml
 343                         "text xml": jQuery.parseXML
 344                 }
 345         },
 346
 347         ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
 348         ajaxTransport: addToPrefiltersOrTransports( transports ),
 349
 350         // Main method
 351         ajax: function( url, options ) {
 352
 353                 // If url is an object, simulate pre-1.5 signature
 354                 if ( typeof url === "object" ) {
 355                         options = url;
 356                         url = undefined;
 357                 }
 358
 359                 // Force options to be an object
 360                 options = options || {};
 361
 362                 var // Create the final options object
 363                         s = jQuery.extend( true, {}, jQuery.ajaxSettings, options ),
 364                         // Callbacks context
 365                         // We force the original context if it exists
 366                         // or take it from jQuery.ajaxSettings otherwise
 367                         // (plain objects used as context get extended)
 368                         callbackContext =
 369                                 ( s.context = ( "context" in options ? options : jQuery.ajaxSettings ).context ) || s,
 370                         // Context for global events
 371                         // It's the callbackContext if one was provided in the options
 372                         // and if it's a DOM node or a jQuery collection
 373                         globalEventContext = callbackContext !== s &&
 374                                 ( callbackContext.nodeType || callbackContext instanceof jQuery ) ?
 375                                                 jQuery( callbackContext ) : jQuery.event,
 376                         // Deferreds
 377                         deferred = jQuery.Deferred(),
 378                         completeDeferred = jQuery._Deferred(),
 379                         // Status-dependent callbacks
 380                         statusCode = s.statusCode || {},
 381                         // ifModified key
 382                         ifModifiedKey,
 383                         // Headers (they are sent all at once)
 384                         requestHeaders = {},
 385                         // Response headers
 386                         responseHeadersString,
 387                         responseHeaders,
 388                         // transport
 389                         transport,
 390                         // timeout handle
 391                         timeoutTimer,
 392                         // Cross-domain detection vars
 393                         parts,
 394                         // The jqXHR state
 395                         state = 0,
 396                         // To know if global events are to be dispatched
 397                         fireGlobals,
 398                         // Loop variable
 399                         i,
 400                         // Fake xhr
 401                         jqXHR = {
 402
 403                                 readyState: 0,
 404
 405                                 // Caches the header
 406                                 setRequestHeader: function( name, value ) {
 407                                         if ( !state ) {
 408                                                 requestHeaders[ name.toLowerCase().replace( rucHeaders, rucHeadersFunc ) ] = value;
 409                                         }
 410                                         return this;
 411                                 },
 412
 413                                 // Raw string
 414                                 getAllResponseHeaders: function() {
 415                                         return state === 2 ? responseHeadersString : null;
 416                                 },
 417
 418                                 // Builds headers hashtable if needed
 419                                 getResponseHeader: function( key ) {
 420                                         var match;
 421                                         if ( state === 2 ) {
 422                                                 if ( !responseHeaders ) {
 423                                                         responseHeaders = {};
 424                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 425                                                                 responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
 426                                                         }
 427                                                 }
 428                                                 match = responseHeaders[ key.toLowerCase() ];
 429                                         }
 430                                         return match || null;
 431                                 },
 432
 433                                 // Overrides response content-type header
 434                                 overrideMimeType: function( type ) {
 435                                         if ( !state ) {
 436                                                 s.mimeType = type;
 437                                         }
 438                                         return this;
 439                                 },
 440
 441                                 // Cancel the request
 442                                 abort: function( statusText ) {
 443                                         statusText = statusText || "abort";
 444                                         if ( transport ) {
 445                                                 transport.abort( statusText );
 446                                         }
 447                                         done( 0, statusText );
 448                                         return this;
 449                                 }
 450                         };
 451
 452                 // Callback for when everything is done
 453                 // It is defined here because jslint complains if it is declared
 454                 // at the end of the function (which would be more logical and readable)
 455                 function done( status, statusText, responses, headers ) {
 456
 457                         // Called once
 458                         if ( state === 2 ) {
 459                                 return;
 460                         }
 461
 462                         // State is "done" now
 463                         state = 2;
 464
 465                         // Clear timeout if it exists
 466                         if ( timeoutTimer ) {
 467                                 clearTimeout( timeoutTimer );
 468                         }
 469
 470                         // Dereference transport for early garbage collection
 471                         // (no matter how long the jqXHR object will be used)
 472                         transport = undefined;
 473
 474                         // Cache response headers
 475                         responseHeadersString = headers || "";
 476
 477                         // Set readyState
 478                         jqXHR.readyState = status ? 4 : 0;
 479
 480                         var isSuccess,
 481                                 success,
 482                                 error,
 483                                 response = responses ? ajaxHandleResponses( s, jqXHR, responses ) : undefined,
 484                                 lastModified,
 485                                 etag;
 486
 487                         // If successful, handle type chaining
 488                         if ( status >= 200 && status < 300 || status === 304 ) {
 489
 490                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 491                                 if ( s.ifModified ) {
 492
 493                                         if ( ( lastModified = jqXHR.getResponseHeader( "Last-Modified" ) ) ) {
 494                                                 jQuery.lastModified[ ifModifiedKey ] = lastModified;
 495                                         }
 496                                         if ( ( etag = jqXHR.getResponseHeader( "Etag" ) ) ) {
 497                                                 jQuery.etag[ ifModifiedKey ] = etag;
 498                                         }
 499                                 }
 500
 501                                 // If not modified
 502                                 if ( status === 304 ) {
 503
 504                                         statusText = "notmodified";
 505                                         isSuccess = true;
 506
 507                                 // If we have data
 508                                 } else {
 509
 510                                         try {
 511                                                 success = ajaxConvert( s, response );
 512                                                 statusText = "success";
 513                                                 isSuccess = true;
 514                                         } catch(e) {
 515                                                 // We have a parsererror
 516                                                 statusText = "parsererror";
 517                                                 error = e;
 518                                         }
 519                                 }
 520                         } else {
 521                                 // We extract error from statusText
 522                                 // then normalize statusText and status for non-aborts
 523                                 error = statusText;
 524                                 if( !statusText || status ) {
 525                                         statusText = "error";
 526                                         if ( status < 0 ) {
 527                                                 status = 0;
 528                                         }
 529                                 }
 530                         }
 531
 532                         // Set data for the fake xhr object
 533                         jqXHR.status = status;
 534                         jqXHR.statusText = statusText;
 535
 536                         // Success/Error
 537                         if ( isSuccess ) {
 538                                 deferred.resolveWith( callbackContext, [ success, statusText, jqXHR ] );
 539                         } else {
 540                                 deferred.rejectWith( callbackContext, [ jqXHR, statusText, error ] );
 541                         }
 542
 543                         // Status-dependent callbacks
 544                         jqXHR.statusCode( statusCode );
 545                         statusCode = undefined;
 546
 547                         if ( fireGlobals ) {
 548                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ),
 549                                                 [ jqXHR, s, isSuccess ? success : error ] );
 550                         }
 551
 552                         // Complete
 553                         completeDeferred.resolveWith( callbackContext, [ jqXHR, statusText ] );
 554
 555                         if ( fireGlobals ) {
 556                                 globalEventContext.trigger( "ajaxComplete", [ jqXHR, s] );
 557                                 // Handle the global AJAX counter
 558                                 if ( !( --jQuery.active ) ) {
 559                                         jQuery.event.trigger( "ajaxStop" );
 560                                 }
 561                         }
 562                 }
 563
 564                 // Attach deferreds
 565                 deferred.promise( jqXHR );
 566                 jqXHR.success = jqXHR.done;
 567                 jqXHR.error = jqXHR.fail;
 568                 jqXHR.complete = completeDeferred.done;
 569
 570                 // Status-dependent callbacks
 571                 jqXHR.statusCode = function( map ) {
 572                         if ( map ) {
 573                                 var tmp;
 574                                 if ( state < 2 ) {
 575                                         for( tmp in map ) {
 576                                                 statusCode[ tmp ] = [ statusCode[tmp], map[tmp] ];
 577                                         }
 578                                 } else {
 579                                         tmp = map[ jqXHR.status ];
 580                                         jqXHR.then( tmp, tmp );
 581                                 }
 582                         }
 583                         return this;
 584                 };
 585
 586                 // Remove hash character (#7531: and string promotion)
 587                 // Add protocol if not provided (#5866: IE7 issue with protocol-less urls)
 588                 // We also use the url parameter if available
 589                 s.url = ( "" + ( url || s.url ) ).replace( rhash, "" ).replace( rprotocol, ajaxLocParts[ 1 ] + "//" );
 590
 591                 // Extract dataTypes list
 592                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
 593
 594                 // Determine if a cross-domain request is in order
 595                 if ( !s.crossDomain ) {
 596                         parts = rurl.exec( s.url.toLowerCase() );
 597                         s.crossDomain = !!( parts &&
 598                                 ( parts[ 1 ] != ajaxLocParts[ 1 ] || parts[ 2 ] != ajaxLocParts[ 2 ] ||
 599                                         ( parts[ 3 ] || ( parts[ 1 ] === "http:" ? 80 : 443 ) ) !=
 600                                                 ( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? 80 : 443 ) ) )
 601                         );
 602                 }
 603
 604                 // Convert data if not already a string
 605                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 606                         s.data = jQuery.param( s.data, s.traditional );
 607                 }
 608
 609                 // Apply prefilters
 610                 inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );
 611
 612                 // If request was aborted inside a prefiler, stop there
 613                 if ( state === 2 ) {
 614                         return false;
 615                 }
 616
 617                 // We can fire global events as of now if asked to
 618                 fireGlobals = s.global;
 619
 620                 // Uppercase the type
 621                 s.type = s.type.toUpperCase();
 622
 623                 // Determine if request has content
 624                 s.hasContent = !rnoContent.test( s.type );
 625
 626                 // Watch for a new set of requests
 627                 if ( fireGlobals && jQuery.active++ === 0 ) {
 628                         jQuery.event.trigger( "ajaxStart" );
 629                 }
 630
 631                 // More options handling for requests with no content
 632                 if ( !s.hasContent ) {
 633
 634                         // If data is available, append data to url
 635                         if ( s.data ) {
 636                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 637                         }
 638
 639                         // Get ifModifiedKey before adding the anti-cache parameter
 640                         ifModifiedKey = s.url;
 641
 642                         // Add anti-cache in url if needed
 643                         if ( s.cache === false ) {
 644
 645                                 var ts = jQuery.now(),
 646                                         // try replacing _= if it is there
 647                                         ret = s.url.replace( rts, "$1_=" + ts );
 648
 649                                 // if nothing was replaced, add timestamp to the end
 650                                 s.url = ret + ( (ret === s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "" );
 651                         }
 652                 }
 653
 654                 // Set the correct header, if data is being sent
 655                 if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 656                         requestHeaders[ "Content-Type" ] = s.contentType;
 657                 }
 658
 659                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 660                 if ( s.ifModified ) {
 661                         ifModifiedKey = ifModifiedKey || s.url;
 662                         if ( jQuery.lastModified[ ifModifiedKey ] ) {
 663                                 requestHeaders[ "If-Modified-Since" ] = jQuery.lastModified[ ifModifiedKey ];
 664                         }
 665                         if ( jQuery.etag[ ifModifiedKey ] ) {
 666                                 requestHeaders[ "If-None-Match" ] = jQuery.etag[ ifModifiedKey ];
 667                         }
 668                 }
 669
 670                 // Set the Accepts header for the server, depending on the dataType
 671                 requestHeaders.Accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
 672                         s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 673                         s.accepts[ "*" ];
 674
 675                 // Check for headers option
 676                 for ( i in s.headers ) {
 677                         jqXHR.setRequestHeader( i, s.headers[ i ] );
 678                 }
 679
 680                 // Allow custom headers/mimetypes and early abort
 681                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jqXHR, s ) === false || state === 2 ) ) {
 682                                 // Abort if not done already
 683                                 jqXHR.abort();
 684                                 return false;
 685
 686                 }
 687
 688                 // Install callbacks on deferreds
 689                 for ( i in { success: 1, error: 1, complete: 1 } ) {
 690                         jqXHR[ i ]( s[ i ] );
 691                 }
 692
 693                 // Get transport
 694                 transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );
 695
 696                 // If no transport, we auto-abort
 697                 if ( !transport ) {
 698                         done( -1, "No Transport" );
 699                 } else {
 700                         jqXHR.readyState = 1;
 701                         // Send global event
 702                         if ( fireGlobals ) {
 703                                 globalEventContext.trigger( "ajaxSend", [ jqXHR, s ] );
 704                         }
 705                         // Timeout
 706                         if ( s.async && s.timeout > 0 ) {
 707                                 timeoutTimer = setTimeout( function(){
 708                                         jqXHR.abort( "timeout" );
 709                                 }, s.timeout );
 710                         }
 711
 712                         try {
 713                                 state = 1;
 714                                 transport.send( requestHeaders, done );
 715                         } catch (e) {
 716                                 // Propagate exception as error if not done
 717                                 if ( status < 2 ) {
 718                                         done( -1, e );
 719                                 // Simply rethrow otherwise
 720                                 } else {
 721                                         jQuery.error( e );
 722                                 }
 723                         }
 724                 }
 725
 726                 return jqXHR;
 727         },
 728
 729         // Serialize an array of form elements or a set of
 730         // key/values into a query string
 731         param: function( a, traditional ) {
 732                 var s = [],
 733                         add = function( key, value ) {
 734                                 // If value is a function, invoke it and return its value
 735                                 value = jQuery.isFunction( value ) ? value() : value;
 736                                 s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
 737                         };
 738
 739                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 740                 if ( traditional === undefined ) {
 741                         traditional = jQuery.ajaxSettings.traditional;
 742                 }
 743
 744                 // If an array was passed in, assume that it is an array of form elements.
 745                 if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
 746                         // Serialize the form elements
 747                         jQuery.each( a, function() {
 748                                 add( this.name, this.value );
 749                         } );
 750
 751                 } else {
 752                         // If traditional, encode the "old" way (the way 1.3.2 or older
 753                         // did it), otherwise encode params recursively.
 754                         for ( var prefix in a ) {
 755                                 buildParams( prefix, a[ prefix ], traditional, add );
 756                         }
 757                 }
 758
 759                 // Return the resulting serialization
 760                 return s.join( "&" ).replace( r20, "+" );
 761         }
 762 });
 763
 764 function buildParams( prefix, obj, traditional, add ) {
 765         if ( jQuery.isArray( obj ) && obj.length ) {
 766                 // Serialize array item.
 767                 jQuery.each( obj, function( i, v ) {
 768                         if ( traditional || rbracket.test( prefix ) ) {
 769                                 // Treat each array item as a scalar.
 770                                 add( prefix, v );
 771
 772                         } else {
 773                                 // If array item is non-scalar (array or object), encode its
 774                                 // numeric index to resolve deserialization ambiguity issues.
 775                                 // Note that rack (as of 1.0.0) can't currently deserialize
 776                                 // nested arrays properly, and attempting to do so may cause
 777                                 // a server error. Possible fixes are to modify rack's
 778                                 // deserialization algorithm or to provide an option or flag
 779                                 // to force array serialization to be shallow.
 780                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 781                         }
 782                 });
 783
 784         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 785                 // If we see an array here, it is empty and should be treated as an empty
 786                 // object
 787                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 788                         add( prefix, "" );
 789
 790                 // Serialize object item.
 791                 } else {
 792                         for ( var name in obj ) {
 793                                 buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
 794                         }
 795                 }
 796
 797         } else {
 798                 // Serialize scalar item.
 799                 add( prefix, obj );
 800         }
 801 }
 802
 803 // This is still on the jQuery object... for now
 804 // Want to move this to jQuery.ajax some day
 805 jQuery.extend({
 806
 807         // Counter for holding the number of active queries
 808         active: 0,
 809
 810         // Last-Modified header cache for next request
 811         lastModified: {},
 812         etag: {}
 813
 814 });
 815
 816 /* Handles responses to an ajax request:
 817  * - sets all responseXXX fields accordingly
 818  * - finds the right dataType (mediates between content-type and expected dataType)
 819  * - returns the corresponding response
 820  */
 821 function ajaxHandleResponses( s, jqXHR, responses ) {
 822
 823         var contents = s.contents,
 824                 dataTypes = s.dataTypes,
 825                 responseFields = s.responseFields,
 826                 ct,
 827                 type,
 828                 finalDataType,
 829                 firstDataType;
 830
 831         // Fill responseXXX fields
 832         for( type in responseFields ) {
 833                 if ( type in responses ) {
 834                         jqXHR[ responseFields[type] ] = responses[ type ];
 835                 }
 836         }
 837
 838         // Remove auto dataType and get content-type in the process
 839         while( dataTypes[ 0 ] === "*" ) {
 840                 dataTypes.shift();
 841                 if ( ct === undefined ) {
 842                         ct = s.mimeType || jqXHR.getResponseHeader( "content-type" );
 843                 }
 844         }
 845
 846         // Check if we're dealing with a known content-type
 847         if ( ct ) {
 848                 for ( type in contents ) {
 849                         if ( contents[ type ] && contents[ type ].test( ct ) ) {
 850                                 dataTypes.unshift( type );
 851                                 break;
 852                         }
 853                 }
 854         }
 855
 856         // Check to see if we have a response for the expected dataType
 857         if ( dataTypes[ 0 ] in responses ) {
 858                 finalDataType = dataTypes[ 0 ];
 859         } else {
 860                 // Try convertible dataTypes
 861                 for ( type in responses ) {
 862                         if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
 863                                 finalDataType = type;
 864                                 break;
 865                         }
 866                         if ( !firstDataType ) {
 867                                 firstDataType = type;
 868                         }
 869                 }
 870                 // Or just use first one
 871                 finalDataType = finalDataType || firstDataType;
 872         }
 873
 874         // If we found a dataType
 875         // We add the dataType to the list if needed
 876         // and return the corresponding response
 877         if ( finalDataType ) {
 878                 if ( finalDataType !== dataTypes[ 0 ] ) {
 879                         dataTypes.unshift( finalDataType );
 880                 }
 881                 return responses[ finalDataType ];
 882         }
 883 }
 884
 885 // Chain conversions given the request and the original response
 886 function ajaxConvert( s, response ) {
 887
 888         // Apply the dataFilter if provided
 889         if ( s.dataFilter ) {
 890                 response = s.dataFilter( response, s.dataType );
 891         }
 892
 893         var dataTypes = s.dataTypes,
 894                 converters = {},
 895                 i,
 896                 key,
 897                 length = dataTypes.length,
 898                 tmp,
 899                 // Current and previous dataTypes
 900                 current = dataTypes[ 0 ],
 901                 prev,
 902                 // Conversion expression
 903                 conversion,
 904                 // Conversion function
 905                 conv,
 906                 // Conversion functions (transitive conversion)
 907                 conv1,
 908                 conv2;
 909
 910         // For each dataType in the chain
 911         for( i = 1; i < length; i++ ) {
 912
 913                 // Create converters map
 914                 // with lowercased keys
 915                 if ( i === 1 ) {
 916                         for( key in s.converters ) {
 917                                 if( typeof key === "string" ) {
 918                                         converters[ key.toLowerCase() ] = s.converters[ key ];
 919                                 }
 920                         }
 921                 }
 922
 923                 // Get the dataTypes
 924                 prev = current;
 925                 current = dataTypes[ i ];
 926
 927                 // If current is auto dataType, update it to prev
 928                 if( current === "*" ) {
 929                         current = prev;
 930                 // If no auto and dataTypes are actually different
 931                 } else if ( prev !== "*" && prev !== current ) {
 932
 933                         // Get the converter
 934                         conversion = prev + " " + current;
 935                         conv = converters[ conversion ] || converters[ "* " + current ];
 936
 937                         // If there is no direct converter, search transitively
 938                         if ( !conv ) {
 939                                 conv2 = undefined;
 940                                 for( conv1 in converters ) {
 941                                         tmp = conv1.split( " " );
 942                                         if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
 943                                                 conv2 = converters[ tmp[1] + " " + current ];
 944                                                 if ( conv2 ) {
 945                                                         conv1 = converters[ conv1 ];
 946                                                         if ( conv1 === true ) {
 947                                                                 conv = conv2;
 948                                                         } else if ( conv2 === true ) {
 949                                                                 conv = conv1;
 950                                                         }
 951                                                         break;
 952                                                 }
 953                                         }
 954                                 }
 955                         }
 956                         // If we found no converter, dispatch an error
 957                         if ( !( conv || conv2 ) ) {
 958                                 jQuery.error( "No conversion from " + conversion.replace(" "," to ") );
 959                         }
 960                         // If found converter is not an equivalence
 961                         if ( conv !== true ) {
 962                                 // Convert with 1 or 2 converters accordingly
 963                                 response = conv ? conv( response ) : conv2( conv1(response) );
 964                         }
 965                 }
 966         }
 967         return response;
 968 }
 969
 970 })( jQuery );