src/ajax.js

   1 (function( jQuery ) {
   2
   3 var r20 = /%20/g,
   4         rbracket = /\[\]$/,
   5         rhash = /#.*$/,
   6         rheaders = /^(.*?):\s*(.*?)\r?$/mg, // IE leaves an \r character at EOL
   7         rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
   8         rnoContent = /^(?:GET|HEAD)$/,
   9         rquery = /\?/,
  10         rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
  11         rselectTextarea = /^(?:select|textarea)/i,
  12         rts = /([?&])_=[^&]*/,
  13         rurl = /^(\w+:)?\/\/([^\/?#:]+)(?::(\d+))?/,
  14         rCRLF = /\r?\n/g,
  15
  16         // Slice function
  17         sliceFunc = Array.prototype.slice,
  18
  19         // Keep a copy of the old load method
  20         _load = jQuery.fn.load;
  21
  22 jQuery.fn.extend({
  23         load: function( url, params, callback ) {
  24                 if ( typeof url !== "string" && _load ) {
  25                         return _load.apply( this, arguments );
  26
  27                 // Don't do a request if no elements are being requested
  28                 } else if ( !this.length ) {
  29                         return this;
  30                 }
  31
  32                 var off = url.indexOf(" ");
  33                 if ( off >= 0 ) {
  34                         var selector = url.slice(off, url.length);
  35                         url = url.slice(0, off);
  36                 }
  37
  38                 // Default to a GET request
  39                 var type = "GET";
  40
  41                 // If the second parameter was provided
  42                 if ( params ) {
  43                         // If it's a function
  44                         if ( jQuery.isFunction( params ) ) {
  45                                 // We assume that it's the callback
  46                                 callback = params;
  47                                 params = null;
  48
  49                         // Otherwise, build a param string
  50                         } else if ( typeof params === "object" ) {
  51                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
  52                                 type = "POST";
  53                         }
  54                 }
  55
  56                 var self = this;
  57
  58                 // Request the remote document
  59                 jQuery.ajax({
  60                         url: url,
  61                         type: type,
  62                         dataType: "html",
  63                         data: params,
  64                         // Complete callback (responseText is used internally)
  65                         complete: function( jXHR, status, responseText ) {
  66                                 // Store the response as specified by the jXHR object
  67                                 responseText = jXHR.responseText;
  68                                 // If successful, inject the HTML into all the matched elements
  69                                 if ( jXHR.isResolved() ) {
  70                                         // #4825: Get the actual response in case
  71                                         // a dataFilter is present in ajaxSettings
  72                                         jXHR.done(function( r ) {
  73                                                 responseText = r;
  74                                         });
  75                                         // See if a selector was specified
  76                                         self.html( selector ?
  77                                                 // Create a dummy div to hold the results
  78                                                 jQuery("<div>")
  79                                                         // inject the contents of the document in, removing the scripts
  80                                                         // to avoid any 'Permission Denied' errors in IE
  81                                                         .append(responseText.replace(rscript, ""))
  82
  83                                                         // Locate the specified elements
  84                                                         .find(selector) :
  85
  86                                                 // If not, just inject the full result
  87                                                 responseText );
  88                                 }
  89
  90                                 if ( callback ) {
  91                                         self.each( callback, [responseText, status, jXHR] );
  92                                 }
  93                         }
  94                 });
  95
  96                 return this;
  97         },
  98
  99         serialize: function() {
 100                 return jQuery.param(this.serializeArray());
 101         },
 102
 103         serializeArray: function() {
 104                 return this.map(function(){
 105                         return this.elements ? jQuery.makeArray(this.elements) : this;
 106                 })
 107                 .filter(function(){
 108                         return this.name && !this.disabled &&
 109                                 (this.checked || rselectTextarea.test(this.nodeName) ||
 110                                         rinput.test(this.type));
 111                 })
 112                 .map(function(i, elem){
 113                         var val = jQuery(this).val();
 114
 115                         return val == null ?
 116                                 null :
 117                                 jQuery.isArray(val) ?
 118                                         jQuery.map( val, function(val, i){
 119                                                 return { name: elem.name, value: val.replace(rCRLF, "\r\n") };
 120                                         }) :
 121                                         { name: elem.name, value: val.replace(rCRLF, "\r\n") };
 122                 }).get();
 123         }
 124 });
 125
 126 // Attach a bunch of functions for handling common AJAX events
 127 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function(i,o){
 128         jQuery.fn[o] = function(f){
 129                 return this.bind(o, f);
 130         };
 131 });
 132
 133 jQuery.each( [ "get", "post" ], function( i, method ) {
 134         jQuery[ method ] = function( url, data, callback, type ) {
 135                 // shift arguments if data argument was omited
 136                 if ( jQuery.isFunction( data ) ) {
 137                         type = type || callback;
 138                         callback = data;
 139                         data = null;
 140                 }
 141
 142                 return jQuery.ajax({
 143                         type: method,
 144                         url: url,
 145                         data: data,
 146                         success: callback,
 147                         dataType: type
 148                 });
 149         };
 150 });
 151
 152 jQuery.extend({
 153
 154         getScript: function( url, callback ) {
 155                 return jQuery.get(url, null, callback, "script");
 156         },
 157
 158         getJSON: function( url, data, callback ) {
 159                 return jQuery.get(url, data, callback, "json");
 160         },
 161
 162         ajaxSetup: function( settings ) {
 163                 jQuery.extend( true, jQuery.ajaxSettings, settings );
 164                 if ( settings.context ) {
 165                         jQuery.ajaxSettings.context = settings.context;
 166                 }
 167         },
 168
 169         ajaxSettings: {
 170                 url: location.href,
 171                 global: true,
 172                 type: "GET",
 173                 contentType: "application/x-www-form-urlencoded",
 174                 processData: true,
 175                 async: true,
 176                 /*
 177                 timeout: 0,
 178                 data: null,
 179                 dataType: null,
 180                 username: null,
 181                 password: null,
 182                 cache: null,
 183                 traditional: false,
 184                 headers: {},
 185                 crossDomain: null,
 186                 */
 187
 188                 accepts: {
 189                         xml: "application/xml, text/xml",
 190                         html: "text/html",
 191                         text: "text/plain",
 192                         json: "application/json, text/javascript",
 193                         "*": "*/*"
 194                 },
 195
 196                 contents: {
 197                         xml: /xml/,
 198                         html: /html/,
 199                         json: /json/
 200                 },
 201
 202                 // Prefilters
 203                 // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
 204                 // 2) These are called:
 205                 //    * BEFORE asking for a transport
 206                 //    * AFTER param serialization (s.data is a string if s.processData is true)
 207                 // 3) key is the dataType
 208                 // 4) the catchall symbol "*" can be used
 209                 // 5) execution will start with transport dataType and THEN continue down to "*" if needed
 210                 prefilters: {},
 211
 212                 // Transports bindings
 213                 // 1) key is the dataType
 214                 // 2) the catchall symbol "*" can be used
 215                 // 3) selection will start with transport dataType and THEN go to "*" if needed
 216                 transports: {},
 217
 218                 // List of data converters
 219                 // 1) key format is "source_type destination_type" (a single space in-between)
 220                 // 2) the catchall symbol "*" can be used for source_type
 221                 converters: {
 222
 223                         // Convert anything to text
 224                         "* text": window.String,
 225
 226                         // Text to html (true = no transformation)
 227                         "text html": true,
 228
 229                         // Evaluate text as a json expression
 230                         "text json": jQuery.parseJSON,
 231
 232                         // Parse text as xml
 233                         "text xml": jQuery.parseXML
 234                 },
 235
 236                 // Utility function that handles dataType when response is received
 237                 // (for those transports that can give text or xml responses)
 238                 determineDataType: function( ct , text , xml ) {
 239
 240                         var s = this,
 241                                 contents = s.contents,
 242                                 type,
 243                                 regexp,
 244                                 dataTypes = s.dataTypes,
 245                                 transportDataType = dataTypes[0],
 246                                 response;
 247
 248                         // Auto (xml, json, script or text determined given headers)
 249                         if ( transportDataType === "*" ) {
 250
 251                                 for ( type in contents ) {
 252                                         if ( ( regexp = contents[ type ] ) && regexp.test( ct ) ) {
 253                                                 transportDataType = dataTypes[0] = type;
 254                                                 break;
 255                                         }
 256                                 }
 257                         }
 258
 259                         // xml and parsed as such
 260                         if ( transportDataType === "xml" &&
 261                                 xml &&
 262                                 xml.documentElement /* #4958 */ ) {
 263
 264                                 response = xml;
 265
 266                         // Text response was provided
 267                         } else {
 268
 269                                 response = text;
 270
 271                                 // If it's not really text, defer to converters
 272                                 if ( transportDataType !== "text" ) {
 273                                         dataTypes.unshift( "text" );
 274                                 }
 275
 276                         }
 277
 278                         return response;
 279                 }
 280
 281         },
 282
 283         ajaxPrefilter: function( a , b ) {
 284                 ajaxPrefilterOrTransport( "prefilters" , a , b );
 285         },
 286
 287         ajaxTransport: function( a , b ) {
 288                 return ajaxPrefilterOrTransport( "transports" , a , b );
 289         },
 290
 291         // Main method
 292         ajax: function( url , options ) {
 293
 294                 // Handle varargs
 295                 if ( arguments.length === 1 ) {
 296                         options = url;
 297                         url = options ? options.url : undefined;
 298                 }
 299
 300                 // Force options to be an object
 301                 options = options || {};
 302
 303                 // Get the url if provided separately
 304                 options.url = url || options.url;
 305
 306                 var // Create the final options object
 307                         s = jQuery.extend( true , {} , jQuery.ajaxSettings , options ),
 308                         // jQuery lists
 309                         jQuery_lastModified = jQuery.lastModified,
 310                         jQuery_etag = jQuery.etag,
 311                         // Callbacks contexts
 312                         // We force the original context if it exists
 313                         // or take it from jQuery.ajaxSettings otherwise
 314                         // (plain objects used as context get extended)
 315                         callbackContext =
 316                                 ( s.context = ( "context" in options ? options : jQuery.ajaxSettings ).context ) || s,
 317                         globalEventContext = callbackContext === s ? jQuery.event : jQuery( callbackContext ),
 318                         // Deferreds
 319                         deferred = jQuery.Deferred(),
 320                         completeDeferred = jQuery._Deferred(),
 321                         // Status-dependent callbacks
 322                         statusCode = s.statusCode || {},
 323                         // Headers (they are sent all at once)
 324                         requestHeaders = {},
 325                         // Response headers
 326                         responseHeadersString,
 327                         responseHeaders,
 328                         // transport
 329                         transport,
 330                         // timeout handle
 331                         timeoutTimer,
 332                         // Cross-domain detection vars
 333                         loc = document.location,
 334                         protocol = loc.protocol || "http:",
 335                         parts,
 336                         // The jXHR state
 337                         state = 0,
 338                         // Loop variable
 339                         i,
 340                         // Fake xhr
 341                         jXHR = {
 342
 343                                 readyState: 0,
 344
 345                                 // Caches the header
 346                                 setRequestHeader: function(name,value) {
 347                                         if ( state === 0 ) {
 348                                                 requestHeaders[ name.toLowerCase() ] = value;
 349                                         }
 350                                         return this;
 351                                 },
 352
 353                                 // Raw string
 354                                 getAllResponseHeaders: function() {
 355                                         return state === 2 ? responseHeadersString : null;
 356                                 },
 357
 358                                 // Builds headers hashtable if needed
 359                                 getResponseHeader: function( key ) {
 360
 361                                         var match;
 362
 363                                         if ( state === 2 ) {
 364
 365                                                 if ( !responseHeaders ) {
 366
 367                                                         responseHeaders = {};
 368
 369                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 370                                                                 responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
 371                                                         }
 372                                                 }
 373                                                 match = responseHeaders[ key.toLowerCase() ];
 374
 375                                         }
 376
 377                                         return match || null;
 378                                 },
 379
 380                                 // Cancel the request
 381                                 abort: function( statusText ) {
 382                                         if ( transport ) {
 383                                                 transport.abort( statusText || "abort" );
 384                                         }
 385                                         done( 0 , statusText );
 386                                         return this;
 387                                 }
 388                         };
 389
 390                 // Callback for when everything is done
 391                 // It is defined here because jslint complains if it is declared
 392                 // at the end of the function (which would be more logical and readable)
 393                 function done( status , statusText , response , headers) {
 394
 395                         // Called once
 396                         if ( state === 2 ) {
 397                                 return;
 398                         }
 399
 400                         // State is "done" now
 401                         state = 2;
 402
 403                         // Dereference transport for early garbage collection
 404                         // (no matter how long the jXHR transport will be used
 405                         transport = undefined;
 406
 407                         // Set readyState
 408                         jXHR.readyState = status ? 4 : 0;
 409
 410                         // Cache response headers
 411                         responseHeadersString = headers || "";
 412
 413                         // Clear timeout if it exists
 414                         if ( timeoutTimer ) {
 415                                 clearTimeout(timeoutTimer);
 416                         }
 417
 418                         var // Reference url
 419                                 url = s.url,
 420                                 // and ifModified status
 421                                 ifModified = s.ifModified,
 422
 423                                 // Is it a success?
 424                                 isSuccess = 0,
 425                                 // Stored success
 426                                 success,
 427                                 // Stored error
 428                                 error,
 429
 430                                 // Keep track of statusCode callbacks
 431                                 oldStatusCode = statusCode;
 432
 433                         statusCode = undefined;
 434
 435                         // If successful, handle type chaining
 436                         if ( status >= 200 && status < 300 || status === 304 ) {
 437
 438                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 439                                 if ( s.ifModified ) {
 440
 441                                         var lastModified = jXHR.getResponseHeader("Last-Modified"),
 442                                                 etag = jXHR.getResponseHeader("Etag");
 443
 444                                         if (lastModified) {
 445                                                 jQuery_lastModified[ s.url ] = lastModified;
 446                                         }
 447                                         if (etag) {
 448                                                 jQuery_etag[ s.url ] = etag;
 449                                         }
 450                                 }
 451
 452                                 // If not modified
 453                                 if ( status === 304 ) {
 454
 455                                         // Set the statusText accordingly
 456                                         statusText = "notmodified";
 457                                         // Mark as a success
 458                                         isSuccess = 1;
 459
 460                                 // If we have data
 461                                 } else {
 462
 463                                         // Set the statusText accordingly
 464                                         statusText = "success";
 465
 466                                         // Chain data conversions and determine the final value
 467                                         // (if an exception is thrown in the process, it'll be notified as an error)
 468                                         try {
 469
 470                                                 var i,
 471                                                         // Current dataType
 472                                                         current,
 473                                                         // Previous dataType
 474                                                         prev,
 475                                                         // Conversion expression
 476                                                         conversion,
 477                                                         // Conversion function
 478                                                         conv,
 479                                                         // Conversion functions (when text is used in-between)
 480                                                         conv1,
 481                                                         conv2,
 482                                                         // Local references to dataTypes & converters
 483                                                         dataTypes = s.dataTypes,
 484                                                         converters = s.converters,
 485                                                         // DataType to responseXXX field mapping
 486                                                         responses = {
 487                                                                 "xml": "XML",
 488                                                                 "text": "Text"
 489                                                         };
 490
 491                                                 // For each dataType in the chain
 492                                                 for( i = 0 ; i < dataTypes.length ; i++ ) {
 493
 494                                                         current = dataTypes[ i ];
 495
 496                                                         // If a responseXXX field for this dataType exists
 497                                                         // and if it hasn't been set yet
 498                                                         if ( responses[ current ] ) {
 499                                                                 // Set it
 500                                                                 jXHR[ "response" + responses[ current ] ] = response;
 501                                                                 // Mark it as set
 502                                                                 responses[ current ] = 0;
 503                                                         }
 504
 505                                                         // If this is not the first element
 506                                                         if ( i ) {
 507
 508                                                                 // Get the dataType to convert from
 509                                                                 prev = dataTypes[ i - 1 ];
 510
 511                                                                 // If no catch-all and dataTypes are actually different
 512                                                                 if ( prev !== "*" && current !== "*" && prev !== current ) {
 513
 514                                                                         // Get the converter
 515                                                                         conversion = prev + " " + current;
 516                                                                         conv = converters[ conversion ] || converters[ "* " + current ];
 517
 518                                                                         conv1 = conv2 = 0;
 519
 520                                                                         // If there is no direct converter and none of the dataTypes is text
 521                                                                         if ( ! conv && prev !== "text" && current !== "text" ) {
 522                                                                                 // Try with text in-between
 523                                                                                 conv1 = converters[ prev + " text" ] || converters[ "* text" ];
 524                                                                                 conv2 = converters[ "text " + current ];
 525                                                                                 // Revert back to a single converter
 526                                                                                 // if one of the converter is an equivalence
 527                                                                                 if ( conv1 === true ) {
 528                                                                                         conv = conv2;
 529                                                                                 } else if ( conv2 === true ) {
 530                                                                                         conv = conv1;
 531                                                                                 }
 532                                                                         }
 533                                                                         // If we found no converter, dispatch an error
 534                                                                         if ( ! ( conv || conv1 && conv2 ) ) {
 535                                                                                 throw conversion;
 536                                                                         }
 537                                                                         // If found converter is not an equivalence
 538                                                                         if ( conv !== true ) {
 539                                                                                 // Convert with 1 or 2 converters accordingly
 540                                                                                 response = conv ? conv( response ) : conv2( conv1( response ) );
 541                                                                         }
 542                                                                 }
 543                                                         // If it is the first element of the chain
 544                                                         // and we have a dataFilter
 545                                                         } else if ( s.dataFilter ) {
 546                                                                 // Apply the dataFilter
 547                                                                 response = s.dataFilter( response , current );
 548                                                                 // Get dataTypes again in case the filter changed them
 549                                                                 dataTypes = s.dataTypes;
 550                                                         }
 551                                                 }
 552                                                 // End of loop
 553
 554                                                 // We have a real success
 555                                                 success = response;
 556                                                 isSuccess = 1;
 557
 558                                         // If an exception was thrown
 559                                         } catch(e) {
 560
 561                                                 // We have a parsererror
 562                                                 statusText = "parsererror";
 563                                                 error = "" + e;
 564
 565                                         }
 566                                 }
 567
 568                         // if not success, mark it as an error
 569                         } else {
 570
 571                                         error = statusText = statusText || "error";
 572
 573                                         // Set responseText if needed
 574                                         if ( response ) {
 575                                                 jXHR.responseText = response;
 576                                         }
 577                         }
 578
 579                         // Set data for the fake xhr object
 580                         jXHR.status = status;
 581                         jXHR.statusText = statusText;
 582
 583                         // Success/Error
 584                         if ( isSuccess ) {
 585                                 deferred.fire( callbackContext , [ success , statusText , jXHR ] );
 586                         } else {
 587                                 deferred.fireReject( callbackContext , [ jXHR , statusText , error ] );
 588                         }
 589
 590                         // Status-dependent callbacks
 591                         jXHR.statusCode( oldStatusCode );
 592
 593                         if ( s.global ) {
 594                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
 595                                                 [ jXHR , s , isSuccess ? success : error ] );
 596                         }
 597
 598                         // Complete
 599                         completeDeferred.fire( callbackContext, [ jXHR , statusText ] );
 600
 601                         if ( s.global ) {
 602                                 globalEventContext.trigger( "ajaxComplete" , [ jXHR , s] );
 603                                 // Handle the global AJAX counter
 604                                 if ( ! --jQuery.active ) {
 605                                         jQuery.event.trigger( "ajaxStop" );
 606                                 }
 607                         }
 608                 }
 609
 610                 // Attach deferreds
 611                 deferred.promise( jXHR );
 612                 jXHR.success = jXHR.done;
 613                 jXHR.error = jXHR.fail;
 614                 jXHR.complete = completeDeferred.done;
 615
 616                 // Status-dependent callbacks
 617                 jXHR.statusCode = function( map ) {
 618                         if ( map ) {
 619                                 var tmp;
 620                                 if ( statusCode ) {
 621                                         for( tmp in map ) {
 622                                                 statusCode[ tmp ] = [ statusCode[ tmp ] , map[ tmp ] ];
 623                                         }
 624                                 } else {
 625                                         tmp = map[ jXHR.status ];
 626                                         jXHR.done( tmp ).fail( tmp );
 627                                 }
 628                         }
 629                         return this;
 630                 };
 631
 632                 // Remove hash character (#7531: and string promotion)
 633                 s.url = ( "" + s.url ).replace( rhash , "" );
 634
 635                 // Extract dataTypes list
 636                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
 637
 638                 // Determine if a cross-domain request is in order
 639                 if ( ! s.crossDomain ) {
 640                         parts = rurl.exec( s.url.toLowerCase() );
 641                         s.crossDomain = !!(
 642                                         parts &&
 643                                         ( parts[ 1 ] && parts[ 1 ] != protocol ||
 644                                                 parts[ 2 ] != loc.hostname ||
 645                                                 ( parts[ 3 ] || ( ( parts[ 1 ] || protocol ) === "http:" ? 80 : 443 ) ) !=
 646                                                         ( loc.port || ( protocol === "http:" ? 80 : 443 ) ) )
 647                         );
 648                 }
 649
 650                 // Convert data if not already a string
 651                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 652                         s.data = jQuery.param( s.data , s.traditional );
 653                 }
 654
 655                 // Apply prefilters
 656                 jQuery.ajaxPrefilter( s , options );
 657
 658                 // Uppercase the type
 659                 s.type = s.type.toUpperCase();
 660
 661                 // Determine if request has content
 662                 s.hasContent = ! rnoContent.test( s.type );
 663
 664                 // Watch for a new set of requests
 665                 if ( s.global && jQuery.active++ === 0 ) {
 666                         jQuery.event.trigger( "ajaxStart" );
 667                 }
 668
 669                 // More options handling for requests with no content
 670                 if ( ! s.hasContent ) {
 671
 672                         // If data is available, append data to url
 673                         if ( s.data ) {
 674                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 675                         }
 676
 677                         // Add anti-cache in url if needed
 678                         if ( s.cache === false ) {
 679
 680                                 var ts = jQuery.now(),
 681                                         // try replacing _= if it is there
 682                                         ret = s.url.replace( rts , "$1_=" + ts );
 683
 684                                 // if nothing was replaced, add timestamp to the end
 685                                 s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
 686                         }
 687                 }
 688
 689                 // Set the correct header, if data is being sent
 690                 if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 691                         requestHeaders[ "content-type" ] = s.contentType;
 692                 }
 693
 694                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 695                 if ( s.ifModified ) {
 696                         if ( jQuery_lastModified[ s.url ] ) {
 697                                 requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
 698                         }
 699                         if ( jQuery_etag[ s.url ] ) {
 700                                 requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
 701                         }
 702                 }
 703
 704                 // Set the Accepts header for the server, depending on the dataType
 705                 requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
 706                         s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 707                         s.accepts[ "*" ];
 708
 709                 // Check for headers option
 710                 for ( i in s.headers ) {
 711                         requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
 712                 }
 713
 714                 // Allow custom headers/mimetypes and early abort
 715                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
 716
 717                                 // Abort if not done already
 718                                 done( 0 , "abort" );
 719
 720                                 // Return false
 721                                 jXHR = false;
 722
 723                 } else {
 724
 725                         // Install callbacks on deferreds
 726                         for ( i in { success:1, error:1, complete:1 } ) {
 727                                 jXHR[ i ]( s[ i ] );
 728                         }
 729
 730                         // Get transport
 731                         transport = jQuery.ajaxTransport( s , options );
 732
 733                         // If no transport, we auto-abort
 734                         if ( ! transport ) {
 735
 736                                 done( 0 , "notransport" );
 737
 738                         } else {
 739
 740                                 // Set state as sending
 741                                 state = jXHR.readyState = 1;
 742
 743                                 // Send global event
 744                                 if ( s.global ) {
 745                                         globalEventContext.trigger( "ajaxSend" , [ jXHR , s ] );
 746                                 }
 747
 748                                 // Timeout
 749                                 if ( s.async && s.timeout > 0 ) {
 750                                         timeoutTimer = setTimeout(function(){
 751                                                 jXHR.abort( "timeout" );
 752                                         }, s.timeout);
 753                                 }
 754
 755                                 // Try to send
 756                                 try {
 757                                         transport.send(requestHeaders, done);
 758                                 } catch (e) {
 759                                         // Propagate exception as error if not done
 760                                         if ( status === 1 ) {
 761
 762                                                 done(0, "error", "" + e);
 763                                                 jXHR = false;
 764
 765                                         // Simply rethrow otherwise
 766                                         } else {
 767                                                 jQuery.error(e);
 768                                         }
 769                                 }
 770                         }
 771                 }
 772
 773                 return jXHR;
 774         },
 775
 776         // Serialize an array of form elements or a set of
 777         // key/values into a query string
 778         param: function( a, traditional ) {
 779                 var s = [],
 780                         add = function( key, value ) {
 781                                 // If value is a function, invoke it and return its value
 782                                 value = jQuery.isFunction(value) ? value() : value;
 783                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 784                         };
 785
 786                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 787                 if ( traditional === undefined ) {
 788                         traditional = jQuery.ajaxSettings.traditional;
 789                 }
 790
 791                 // If an array was passed in, assume that it is an array of form elements.
 792                 if ( jQuery.isArray(a) || a.jquery ) {
 793                         // Serialize the form elements
 794                         jQuery.each( a, function() {
 795                                 add( this.name, this.value );
 796                         });
 797
 798                 } else {
 799                         // If traditional, encode the "old" way (the way 1.3.2 or older
 800                         // did it), otherwise encode params recursively.
 801                         for ( var prefix in a ) {
 802                                 buildParams( prefix, a[prefix], traditional, add );
 803                         }
 804                 }
 805
 806                 // Return the resulting serialization
 807                 return s.join("&").replace(r20, "+");
 808         }
 809 });
 810
 811 function buildParams( prefix, obj, traditional, add ) {
 812         if ( jQuery.isArray(obj) && obj.length ) {
 813                 // Serialize array item.
 814                 jQuery.each( obj, function( i, v ) {
 815                         if ( traditional || rbracket.test( prefix ) ) {
 816                                 // Treat each array item as a scalar.
 817                                 add( prefix, v );
 818
 819                         } else {
 820                                 // If array item is non-scalar (array or object), encode its
 821                                 // numeric index to resolve deserialization ambiguity issues.
 822                                 // Note that rack (as of 1.0.0) can't currently deserialize
 823                                 // nested arrays properly, and attempting to do so may cause
 824                                 // a server error. Possible fixes are to modify rack's
 825                                 // deserialization algorithm or to provide an option or flag
 826                                 // to force array serialization to be shallow.
 827                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 828                         }
 829                 });
 830
 831         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 832                 // If we see an array here, it is empty and should be treated as an empty
 833                 // object
 834                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 835                         add( prefix, "" );
 836
 837                 // Serialize object item.
 838                 } else {
 839                         jQuery.each( obj, function( k, v ) {
 840                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 841                         });
 842                 }
 843
 844         } else {
 845                 // Serialize scalar item.
 846                 add( prefix, obj );
 847         }
 848 }
 849
 850 // This is still on the jQuery object... for now
 851 // Want to move this to jQuery.ajax some day
 852 jQuery.extend({
 853
 854         // Counter for holding the number of active queries
 855         active: 0,
 856
 857         // Last-Modified header cache for next request
 858         lastModified: {},
 859         etag: {}
 860
 861 });
 862
 863 // Base function for both ajaxPrefilter and ajaxTransport
 864 function ajaxPrefilterOrTransport( arg0 , arg1 , arg2 ) {
 865
 866         var type = jQuery.type( arg1 ),
 867                 structure = jQuery.ajaxSettings[ arg0 ],
 868                 i,
 869                 length;
 870
 871         // We have an options map so we have to inspect the structure
 872         if ( type === "object" ) {
 873
 874                 var options = arg1,
 875                         originalOptions = arg2,
 876                         // When dealing with prefilters, we execute only
 877                         // (no selection so we never stop when a function
 878                         // returns a non-falsy, non-string value)
 879                         executeOnly = ( arg0 === "prefilters" ),
 880                         inspect = function( dataType, tested ) {
 881
 882                                 if ( ! tested[ dataType ] ) {
 883
 884                                         tested[ dataType ] = true;
 885
 886                                         var list = structure[ dataType ],
 887                                                 selected;
 888
 889                                         for( i = 0, length = list ? list.length : 0 ; ( executeOnly || ! selected ) && i < length ; i++ ) {
 890                                                 selected = list[ i ]( options , originalOptions );
 891                                                 // If we got redirected to a different dataType,
 892                                                 // we add it and switch to the corresponding list
 893                                                 if ( typeof( selected ) === "string" && selected !== dataType ) {
 894                                                         options.dataTypes.unshift( selected );
 895                                                         selected = inspect( selected , tested );
 896                                                         // We always break in order not to continue
 897                                                         // to iterate in previous list
 898                                                         break;
 899                                                 }
 900                                         }
 901                                         // If we're only executing or nothing was selected
 902                                         // we try the catchall dataType
 903                                         if ( executeOnly || ! selected ) {
 904                                                 selected = inspect( "*" , tested );
 905                                         }
 906                                         // This will be ignored by ajaxPrefilter
 907                                         // so it's safe to return no matter what
 908                                         return selected;
 909                                 }
 910
 911                         };
 912
 913                 // Start inspection with current transport dataType
 914                 return inspect( options.dataTypes[ 0 ] , {} );
 915
 916         } else {
 917
 918                 // We're requested to add to the structure
 919                 // Signature is ( dataTypeExpression , function )
 920                 // with dataTypeExpression being optional and
 921                 // defaulting to catchAll (*)
 922                 type = type === "function";
 923
 924                 if ( type ) {
 925                         arg2 = arg1;
 926                         arg1 = undefined;
 927                 }
 928                 arg1 = arg1 || "*";
 929
 930                 // We control that the second argument is really a function
 931                 if ( type || jQuery.isFunction( arg2 ) ) {
 932
 933                         var dataTypes = arg1.split( /\s+/ ),
 934                                 functor = arg2,
 935                                 dataType,
 936                                 list,
 937                                 placeBefore;
 938
 939                         // For each dataType in the dataTypeExpression
 940                         for( i = 0 , length = dataTypes.length ; i < length ; i++ ) {
 941                                 dataType = dataTypes[ i ];
 942                                 // We control if we're asked to add before
 943                                 // any existing element
 944                                 placeBefore = /^\+/.test( dataType );
 945                                 if ( placeBefore ) {
 946                                         dataType = dataType.substr( 1 );
 947                                 }
 948                                 list = structure[ dataType ] = structure[ dataType ] || [];
 949                                 // then we add to the structure accordingly
 950                                 list[ placeBefore ? "unshift" : "push" ]( functor );
 951                         }
 952                 }
 953         }
 954 }
 955
 956 })( jQuery );