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