src/ajax.js

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