src/ajax.js

   1 (function( jQuery ) {
   2
   3 var r20 = /%20/g,
   4         rbracket = /\[\]$/,
   5         rCRLF = /\r?\n/g,
   6         rhash = /#.*$/,
   7         rheaders = /^(.*?):\s*(.*?)\r?$/mg, // IE leaves an \r character at EOL
   8         rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
   9         // #7653, #8125, #8152: local protocol detection
  10         rlocalProtocol = /(?:^file|^widget|\-extension):$/,
  11         rnoContent = /^(?:GET|HEAD)$/,
  12         rprotocol = /^\/\//,
  13         rquery = /\?/,
  14         rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
  15         rselectTextarea = /^(?:select|textarea)/i,
  16         rspacesAjax = /\s+/,
  17         rts = /([?&])_=[^&]*/,
  18         rucWord = /(^|\-)([a-z])/g,
  19         rurl = /^([\w\+\.\-]+:)\/\/([^\/?#:]*)(?::(\d+))?/,
  20
  21         // Keep a copy of the old load method
  22         _load = jQuery.fn.load,
  23
  24         /* Prefilters
  25          * 1) They are useful to introduce custom dataTypes (see ajax/jsonp.js for an example)
  26          * 2) These are called:
  27          *    - BEFORE asking for a transport
  28          *    - AFTER param serialization (s.data is a string if s.processData is true)
  29          * 3) key is the dataType
  30          * 4) the catchall symbol "*" can be used
  31          * 5) execution will start with transport dataType and THEN continue down to "*" if needed
  32          */
  33         prefilters = {},
  34
  35         /* Transports bindings
  36          * 1) key is the dataType
  37          * 2) the catchall symbol "*" can be used
  38          * 3) selection will start with transport dataType and THEN go to "*" if needed
  39          */
  40         transports = {},
  41
  42         // Document location
  43         ajaxLocation,
  44
  45         // Document location segments
  46         ajaxLocParts;
  47
  48 // #8138, IE may throw an exception when accessing
  49 // a field from document.location if document.domain has been set
  50 try {
  51         ajaxLocation = document.location.href;
  52 } catch( e ) {
  53         // Use the href attribute of an A element
  54         // since IE will modify it given document.location
  55         ajaxLocation = document.createElement( "a" );
  56         ajaxLocation.href = "";
  57         ajaxLocation = ajaxLocation.href;
  58 }
  59
  60 // Segment location into parts
  61 ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() );
  62
  63 // Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
  64 function addToPrefiltersOrTransports( structure ) {
  65
  66         // dataTypeExpression is optional and defaults to "*"
  67         return function( dataTypeExpression, func ) {
  68
  69                 if ( typeof dataTypeExpression !== "string" ) {
  70                         func = dataTypeExpression;
  71                         dataTypeExpression = "*";
  72                 }
  73
  74                 if ( jQuery.isFunction( func ) ) {
  75                         var dataTypes = dataTypeExpression.toLowerCase().split( rspacesAjax ),
  76                                 i = 0,
  77                                 length = dataTypes.length,
  78                                 dataType,
  79                                 list,
  80                                 placeBefore;
  81
  82                         // For each dataType in the dataTypeExpression
  83                         for(; i < length; i++ ) {
  84                                 dataType = dataTypes[ i ];
  85                                 // We control if we're asked to add before
  86                                 // any existing element
  87                                 placeBefore = /^\+/.test( dataType );
  88                                 if ( placeBefore ) {
  89                                         dataType = dataType.substr( 1 ) || "*";
  90                                 }
  91                                 list = structure[ dataType ] = structure[ dataType ] || [];
  92                                 // then we add to the structure accordingly
  93                                 list[ placeBefore ? "unshift" : "push" ]( func );
  94                         }
  95                 }
  96         };
  97 }
  98
  99 //Base inspection function for prefilters and transports
 100 function inspectPrefiltersOrTransports( structure, options, originalOptions, jqXHR,
 101                 dataType /* internal */, inspected /* internal */ ) {
 102
 103         dataType = dataType || options.dataTypes[ 0 ];
 104         inspected = inspected || {};
 105
 106         inspected[ dataType ] = true;
 107
 108         var list = structure[ dataType ],
 109                 i = 0,
 110                 length = list ? list.length : 0,
 111                 executeOnly = ( structure === prefilters ),
 112                 selection;
 113
 114         for(; i < length && ( executeOnly || !selection ); i++ ) {
 115                 selection = list[ i ]( options, originalOptions, jqXHR );
 116                 // If we got redirected to another dataType
 117                 // we try there if executing only and not done already
 118                 if ( typeof selection === "string" ) {
 119                         if ( !executeOnly || inspected[ selection ] ) {
 120                                 selection = undefined;
 121                         } else {
 122                                 options.dataTypes.unshift( selection );
 123                                 selection = inspectPrefiltersOrTransports(
 124                                                 structure, options, originalOptions, jqXHR, selection, inspected );
 125                         }
 126                 }
 127         }
 128         // If we're only executing or nothing was selected
 129         // we try the catchall dataType if not done already
 130         if ( ( executeOnly || !selection ) && !inspected[ "*" ] ) {
 131                 selection = inspectPrefiltersOrTransports(
 132                                 structure, options, originalOptions, jqXHR, "*", inspected );
 133         }
 134         // unnecessary when only executing (prefilters)
 135         // but it'll be ignored by the caller in that case
 136         return selection;
 137 }
 138
 139 jQuery.fn.extend({
 140         load: function( url, params, callback ) {
 141                 if ( typeof url !== "string" && _load ) {
 142                         return _load.apply( this, arguments );
 143
 144                 // Don't do a request if no elements are being requested
 145                 } else if ( !this.length ) {
 146                         return this;
 147                 }
 148
 149                 var off = url.indexOf( " " );
 150                 if ( off >= 0 ) {
 151                         var selector = url.slice( off, url.length );
 152                         url = url.slice( 0, off );
 153                 }
 154
 155                 // Default to a GET request
 156                 var type = "GET";
 157
 158                 // If the second parameter was provided
 159                 if ( params ) {
 160                         // If it's a function
 161                         if ( jQuery.isFunction( params ) ) {
 162                                 // We assume that it's the callback
 163                                 callback = params;
 164                                 params = null;
 165
 166                         // Otherwise, build a param string
 167                         } else if ( typeof params === "object" ) {
 168                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
 169                                 type = "POST";
 170                         }
 171                 }
 172
 173                 var self = this;
 174
 175                 // Request the remote document
 176                 jQuery.ajax({
 177                         url: url,
 178                         type: type,
 179                         dataType: "html",
 180                         data: params,
 181                         // Complete callback (responseText is used internally)
 182                         complete: function( jqXHR, status, responseText ) {
 183                                 // Store the response as specified by the jqXHR object
 184                                 responseText = jqXHR.responseText;
 185                                 // If successful, inject the HTML into all the matched elements
 186                                 if ( jqXHR.isResolved() ) {
 187                                         // #4825: Get the actual response in case
 188                                         // a dataFilter is present in ajaxSettings
 189                                         jqXHR.done(function( r ) {
 190                                                 responseText = r;
 191                                         });
 192                                         // See if a selector was specified
 193                                         self.html( selector ?
 194                                                 // Create a dummy div to hold the results
 195                                                 jQuery("<div>")
 196                                                         // inject the contents of the document in, removing the scripts
 197                                                         // to avoid any 'Permission Denied' errors in IE
 198                                                         .append(responseText.replace(rscript, ""))
 199
 200                                                         // Locate the specified elements
 201                                                         .find(selector) :
 202
 203                                                 // If not, just inject the full result
 204                                                 responseText );
 205                                 }
 206
 207                                 if ( callback ) {
 208                                         self.each( callback, [ responseText, status, jqXHR ] );
 209                                 }
 210                         }
 211                 });
 212
 213                 return this;
 214         },
 215
 216         serialize: function() {
 217                 return jQuery.param( this.serializeArray() );
 218         },
 219
 220         serializeArray: function() {
 221                 return this.map(function(){
 222                         return this.elements ? jQuery.makeArray( this.elements ) : this;
 223                 })
 224                 .filter(function(){
 225                         return this.name && !this.disabled &&
 226                                 ( this.checked || rselectTextarea.test( this.nodeName ) ||
 227                                         rinput.test( this.type ) );
 228                 })
 229                 .map(function( i, elem ){
 230                         var val = jQuery( this ).val();
 231
 232                         return val == null ?
 233                                 null :
 234                                 jQuery.isArray( val ) ?
 235                                         jQuery.map( val, function( val, i ){
 236                                                 return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 237                                         }) :
 238                                         { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 239                 }).get();
 240         }
 241 });
 242
 243 // Attach a bunch of functions for handling common AJAX events
 244 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split( " " ), function( i, o ){
 245         jQuery.fn[ o ] = function( f ){
 246                 return this.bind( o, f );
 247         };
 248 } );
 249
 250 jQuery.each( [ "get", "post" ], function( i, method ) {
 251         jQuery[ method ] = function( url, data, callback, type ) {
 252                 // shift arguments if data argument was omitted
 253                 if ( jQuery.isFunction( data ) ) {
 254                         type = type || callback;
 255                         callback = data;
 256                         data = null;
 257                 }
 258
 259                 return jQuery.ajax({
 260                         type: method,
 261                         url: url,
 262                         data: data,
 263                         success: callback,
 264                         dataType: type
 265                 });
 266         };
 267 } );
 268
 269 jQuery.extend({
 270
 271         getScript: function( url, callback ) {
 272                 return jQuery.get( url, null, callback, "script" );
 273         },
 274
 275         getJSON: function( url, data, callback ) {
 276                 return jQuery.get( url, data, callback, "json" );
 277         },
 278
 279         ajaxSetup: function( settings ) {
 280                 jQuery.extend( true, jQuery.ajaxSettings, settings );
 281                 if ( settings.context ) {
 282                         jQuery.ajaxSettings.context = settings.context;
 283                 }
 284         },
 285
 286         ajaxSettings: {
 287                 url: ajaxLocation,
 288                 isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ),
 289                 global: true,
 290                 type: "GET",
 291                 contentType: "application/x-www-form-urlencoded",
 292                 processData: true,
 293                 async: true,
 294                 /*
 295                 timeout: 0,
 296                 data: null,
 297                 dataType: null,
 298                 username: null,
 299                 password: null,
 300                 cache: null,
 301                 traditional: false,
 302                 headers: {},
 303                 crossDomain: null,
 304                 */
 305
 306                 accepts: {
 307                         xml: "application/xml, text/xml",
 308                         html: "text/html",
 309                         text: "text/plain",
 310                         json: "application/json, text/javascript",
 311                         "*": "*/*"
 312                 },
 313
 314                 contents: {
 315                         xml: /xml/,
 316                         html: /html/,
 317                         json: /json/
 318                 },
 319
 320                 responseFields: {
 321                         xml: "responseXML",
 322                         text: "responseText"
 323                 },
 324
 325                 // List of data converters
 326                 // 1) key format is "source_type destination_type" (a single space in-between)
 327                 // 2) the catchall symbol "*" can be used for source_type
 328                 converters: {
 329
 330                         // Convert anything to text
 331                         "* text": window.String,
 332
 333                         // Text to html (true = no transformation)
 334                         "text html": true,
 335
 336                         // Evaluate text as a json expression
 337                         "text json": jQuery.parseJSON,
 338
 339                         // Parse text as xml
 340                         "text xml": jQuery.parseXML
 341                 }
 342         },
 343
 344         ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
 345         ajaxTransport: addToPrefiltersOrTransports( transports ),
 346
 347         // Main method
 348         ajax: function( url, options ) {
 349
 350                 // If url is an object, simulate pre-1.5 signature
 351                 if ( typeof url === "object" ) {
 352                         options = url;
 353                         url = undefined;
 354                 }
 355
 356                 // Force options to be an object
 357                 options = options || {};
 358
 359                 var // Create the final options object
 360                         s = jQuery.extend( true, {}, jQuery.ajaxSettings, options ),
 361                         // Callbacks context
 362                         // We force the original context if it exists
 363                         // or take it from jQuery.ajaxSettings otherwise
 364                         // (plain objects used as context get extended)
 365                         callbackContext =
 366                                 ( s.context = ( "context" in options ? options : jQuery.ajaxSettings ).context ) || s,
 367                         // Context for global events
 368                         // It's the callbackContext if one was provided in the options
 369                         // and if it's a DOM node or a jQuery collection
 370                         globalEventContext = callbackContext !== s &&
 371                                 ( callbackContext.nodeType || callbackContext instanceof jQuery ) ?
 372                                                 jQuery( callbackContext ) : jQuery.event,
 373                         // Deferreds
 374                         deferred = jQuery.Deferred(),
 375                         completeDeferred = jQuery._Deferred(),
 376                         // Status-dependent callbacks
 377                         statusCode = s.statusCode || {},
 378                         // ifModified key
 379                         ifModifiedKey,
 380                         // Headers (they are sent all at once)
 381                         requestHeaders = {},
 382                         // Response headers
 383                         responseHeadersString,
 384                         responseHeaders,
 385                         // transport
 386                         transport,
 387                         // timeout handle
 388                         timeoutTimer,
 389                         // Cross-domain detection vars
 390                         parts,
 391                         // The jqXHR state
 392                         state = 0,
 393                         // To know if global events are to be dispatched
 394                         fireGlobals,
 395                         // Loop variable
 396                         i,
 397                         // Fake xhr
 398                         jqXHR = {
 399
 400                                 readyState: 0,
 401
 402                                 // Caches the header
 403                                 setRequestHeader: function( name, value ) {
 404                                         if ( !state ) {
 405                                                 requestHeaders[ name.toLowerCase().replace( rucWord, function( _, $1, $2 ) {
 406                                                         return $1 + $2.toUpperCase();
 407                                                 } ) ] = value;
 408                                         }
 409                                         return this;
 410                                 },
 411
 412                                 // Raw string
 413                                 getAllResponseHeaders: function() {
 414                                         return state === 2 ? responseHeadersString : null;
 415                                 },
 416
 417                                 // Builds headers hashtable if needed
 418                                 getResponseHeader: function( key ) {
 419                                         var match;
 420                                         if ( state === 2 ) {
 421                                                 if ( !responseHeaders ) {
 422                                                         responseHeaders = {};
 423                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 424                                                                 responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
 425                                                         }
 426                                                 }
 427                                                 match = responseHeaders[ key.toLowerCase() ];
 428                                         }
 429                                         return match || null;
 430                                 },
 431
 432                                 // Overrides response content-type header
 433                                 overrideMimeType: function( type ) {
 434                                         if ( !state ) {
 435                                                 s.mimeType = type;
 436                                         }
 437                                         return this;
 438                                 },
 439
 440                                 // Cancel the request
 441                                 abort: function( statusText ) {
 442                                         statusText = statusText || "abort";
 443                                         if ( transport ) {
 444                                                 transport.abort( statusText );
 445                                         }
 446                                         done( 0, statusText );
 447                                         return this;
 448                                 }
 449                         };
 450
 451                 // Callback for when everything is done
 452                 // It is defined here because jslint complains if it is declared
 453                 // at the end of the function (which would be more logical and readable)
 454                 function done( status, statusText, responses, headers ) {
 455
 456                         // Called once
 457                         if ( state === 2 ) {
 458                                 return;
 459                         }
 460
 461                         // State is "done" now
 462                         state = 2;
 463
 464                         // Clear timeout if it exists
 465                         if ( timeoutTimer ) {
 466                                 clearTimeout( timeoutTimer );
 467                         }
 468
 469                         // Dereference transport for early garbage collection
 470                         // (no matter how long the jqXHR object will be used)
 471                         transport = undefined;
 472
 473                         // Cache response headers
 474                         responseHeadersString = headers || "";
 475
 476                         // Set readyState
 477                         jqXHR.readyState = status ? 4 : 0;
 478
 479                         var isSuccess,
 480                                 success,
 481                                 error,
 482                                 response = responses ? ajaxHandleResponses( s, jqXHR, responses ) : undefined,
 483                                 lastModified,
 484                                 etag;
 485
 486                         // If successful, handle type chaining
 487                         if ( status >= 200 && status < 300 || status === 304 ) {
 488
 489                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 490                                 if ( s.ifModified ) {
 491
 492                                         if ( ( lastModified = jqXHR.getResponseHeader( "Last-Modified" ) ) ) {
 493                                                 jQuery.lastModified[ ifModifiedKey ] = lastModified;
 494                                         }
 495                                         if ( ( etag = jqXHR.getResponseHeader( "Etag" ) ) ) {
 496                                                 jQuery.etag[ ifModifiedKey ] = etag;
 497                                         }
 498                                 }
 499
 500                                 // If not modified
 501                                 if ( status === 304 ) {
 502
 503                                         statusText = "notmodified";
 504                                         isSuccess = true;
 505
 506                                 // If we have data
 507                                 } else {
 508
 509                                         try {
 510                                                 success = ajaxConvert( s, response );
 511                                                 statusText = "success";
 512                                                 isSuccess = true;
 513                                         } catch(e) {
 514                                                 // We have a parsererror
 515                                                 statusText = "parsererror";
 516                                                 error = e;
 517                                         }
 518                                 }
 519                         } else {
 520                                 // We extract error from statusText
 521                                 // then normalize statusText and status for non-aborts
 522                                 error = statusText;
 523                                 if( !statusText || status ) {
 524                                         statusText = "error";
 525                                         if ( status < 0 ) {
 526                                                 status = 0;
 527                                         }
 528                                 }
 529                         }
 530
 531                         // Set data for the fake xhr object
 532                         jqXHR.status = status;
 533                         jqXHR.statusText = statusText;
 534
 535                         // Success/Error
 536                         if ( isSuccess ) {
 537                                 deferred.resolveWith( callbackContext, [ success, statusText, jqXHR ] );
 538                         } else {
 539                                 deferred.rejectWith( callbackContext, [ jqXHR, statusText, error ] );
 540                         }
 541
 542                         // Status-dependent callbacks
 543                         jqXHR.statusCode( statusCode );
 544                         statusCode = undefined;
 545
 546                         if ( fireGlobals ) {
 547                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ),
 548                                                 [ jqXHR, s, isSuccess ? success : error ] );
 549                         }
 550
 551                         // Complete
 552                         completeDeferred.resolveWith( callbackContext, [ jqXHR, statusText ] );
 553
 554                         if ( fireGlobals ) {
 555                                 globalEventContext.trigger( "ajaxComplete", [ jqXHR, s] );
 556                                 // Handle the global AJAX counter
 557                                 if ( !( --jQuery.active ) ) {
 558                                         jQuery.event.trigger( "ajaxStop" );
 559                                 }
 560                         }
 561                 }
 562
 563                 // Attach deferreds
 564                 deferred.promise( jqXHR );
 565                 jqXHR.success = jqXHR.done;
 566                 jqXHR.error = jqXHR.fail;
 567                 jqXHR.complete = completeDeferred.done;
 568
 569                 // Status-dependent callbacks
 570                 jqXHR.statusCode = function( map ) {
 571                         if ( map ) {
 572                                 var tmp;
 573                                 if ( state < 2 ) {
 574                                         for( tmp in map ) {
 575                                                 statusCode[ tmp ] = [ statusCode[tmp], map[tmp] ];
 576                                         }
 577                                 } else {
 578                                         tmp = map[ jqXHR.status ];
 579                                         jqXHR.then( tmp, tmp );
 580                                 }
 581                         }
 582                         return this;
 583                 };
 584
 585                 // Remove hash character (#7531: and string promotion)
 586                 // Add protocol if not provided (#5866: IE7 issue with protocol-less urls)
 587                 // We also use the url parameter if available
 588                 s.url = ( "" + ( url || s.url ) ).replace( rhash, "" ).replace( rprotocol, ajaxLocParts[ 1 ] + "//" );
 589
 590                 // Extract dataTypes list
 591                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
 592
 593                 // Determine if a cross-domain request is in order
 594                 if ( !s.crossDomain ) {
 595                         parts = rurl.exec( s.url.toLowerCase() );
 596                         s.crossDomain = !!( parts &&
 597                                 ( parts[ 1 ] != ajaxLocParts[ 1 ] || parts[ 2 ] != ajaxLocParts[ 2 ] ||
 598                                         ( parts[ 3 ] || ( parts[ 1 ] === "http:" ? 80 : 443 ) ) !=
 599                                                 ( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? 80 : 443 ) ) )
 600                         );
 601                 }
 602
 603                 // Convert data if not already a string
 604                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 605                         s.data = jQuery.param( s.data, s.traditional );
 606                 }
 607
 608                 // Apply prefilters
 609                 inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );
 610
 611                 // If request was aborted inside a prefiler, stop there
 612                 if ( state === 2 ) {
 613                         return false;
 614                 }
 615
 616                 // We can fire global events as of now if asked to
 617                 fireGlobals = s.global;
 618
 619                 // Uppercase the type
 620                 s.type = s.type.toUpperCase();
 621
 622                 // Determine if request has content
 623                 s.hasContent = !rnoContent.test( s.type );
 624
 625                 // Watch for a new set of requests
 626                 if ( fireGlobals && jQuery.active++ === 0 ) {
 627                         jQuery.event.trigger( "ajaxStart" );
 628                 }
 629
 630                 // More options handling for requests with no content
 631                 if ( !s.hasContent ) {
 632
 633                         // If data is available, append data to url
 634                         if ( s.data ) {
 635                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 636                         }
 637
 638                         // Get ifModifiedKey before adding the anti-cache parameter
 639                         ifModifiedKey = s.url;
 640
 641                         // Add anti-cache in url if needed
 642                         if ( s.cache === false ) {
 643
 644                                 var ts = jQuery.now(),
 645                                         // try replacing _= if it is there
 646                                         ret = s.url.replace( rts, "$1_=" + ts );
 647
 648                                 // if nothing was replaced, add timestamp to the end
 649                                 s.url = ret + ( (ret === s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "" );
 650                         }
 651                 }
 652
 653                 // Set the correct header, if data is being sent
 654                 if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 655                         requestHeaders[ "Content-Type" ] = s.contentType;
 656                 }
 657
 658                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 659                 if ( s.ifModified ) {
 660                         ifModifiedKey = ifModifiedKey || s.url;
 661                         if ( jQuery.lastModified[ ifModifiedKey ] ) {
 662                                 requestHeaders[ "If-Modified-Since" ] = jQuery.lastModified[ ifModifiedKey ];
 663                         }
 664                         if ( jQuery.etag[ ifModifiedKey ] ) {
 665                                 requestHeaders[ "If-None-Match" ] = jQuery.etag[ ifModifiedKey ];
 666                         }
 667                 }
 668
 669                 // Set the Accepts header for the server, depending on the dataType
 670                 requestHeaders.Accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
 671                         s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 672                         s.accepts[ "*" ];
 673
 674                 // Check for headers option
 675                 for ( i in s.headers ) {
 676                         jqXHR.setRequestHeader( i, s.headers[ i ] );
 677                 }
 678
 679                 // Allow custom headers/mimetypes and early abort
 680                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jqXHR, s ) === false || state === 2 ) ) {
 681                                 // Abort if not done already
 682                                 jqXHR.abort();
 683                                 return false;
 684
 685                 }
 686
 687                 // Install callbacks on deferreds
 688                 for ( i in { success: 1, error: 1, complete: 1 } ) {
 689                         jqXHR[ i ]( s[ i ] );
 690                 }
 691
 692                 // Get transport
 693                 transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );
 694
 695                 // If no transport, we auto-abort
 696                 if ( !transport ) {
 697                         done( -1, "No Transport" );
 698                 } else {
 699                         jqXHR.readyState = 1;
 700                         // Send global event
 701                         if ( fireGlobals ) {
 702                                 globalEventContext.trigger( "ajaxSend", [ jqXHR, s ] );
 703                         }
 704                         // Timeout
 705                         if ( s.async && s.timeout > 0 ) {
 706                                 timeoutTimer = setTimeout( function(){
 707                                         jqXHR.abort( "timeout" );
 708                                 }, s.timeout );
 709                         }
 710
 711                         try {
 712                                 state = 1;
 713                                 transport.send( requestHeaders, done );
 714                         } catch (e) {
 715                                 // Propagate exception as error if not done
 716                                 if ( status < 2 ) {
 717                                         done( -1, e );
 718                                 // Simply rethrow otherwise
 719                                 } else {
 720                                         jQuery.error( e );
 721                                 }
 722                         }
 723                 }
 724
 725                 return jqXHR;
 726         },
 727
 728         // Serialize an array of form elements or a set of
 729         // key/values into a query string
 730         param: function( a, traditional ) {
 731                 var s = [],
 732                         add = function( key, value ) {
 733                                 // If value is a function, invoke it and return its value
 734                                 value = jQuery.isFunction( value ) ? value() : value;
 735                                 s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
 736                         };
 737
 738                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 739                 if ( traditional === undefined ) {
 740                         traditional = jQuery.ajaxSettings.traditional;
 741                 }
 742
 743                 // If an array was passed in, assume that it is an array of form elements.
 744                 if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
 745                         // Serialize the form elements
 746                         jQuery.each( a, function() {
 747                                 add( this.name, this.value );
 748                         } );
 749
 750                 } else {
 751                         // If traditional, encode the "old" way (the way 1.3.2 or older
 752                         // did it), otherwise encode params recursively.
 753                         for ( var prefix in a ) {
 754                                 buildParams( prefix, a[ prefix ], traditional, add );
 755                         }
 756                 }
 757
 758                 // Return the resulting serialization
 759                 return s.join( "&" ).replace( r20, "+" );
 760         }
 761 });
 762
 763 function buildParams( prefix, obj, traditional, add ) {
 764         if ( jQuery.isArray( obj ) && obj.length ) {
 765                 // Serialize array item.
 766                 jQuery.each( obj, function( i, v ) {
 767                         if ( traditional || rbracket.test( prefix ) ) {
 768                                 // Treat each array item as a scalar.
 769                                 add( prefix, v );
 770
 771                         } else {
 772                                 // If array item is non-scalar (array or object), encode its
 773                                 // numeric index to resolve deserialization ambiguity issues.
 774                                 // Note that rack (as of 1.0.0) can't currently deserialize
 775                                 // nested arrays properly, and attempting to do so may cause
 776                                 // a server error. Possible fixes are to modify rack's
 777                                 // deserialization algorithm or to provide an option or flag
 778                                 // to force array serialization to be shallow.
 779                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 780                         }
 781                 });
 782
 783         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 784                 // If we see an array here, it is empty and should be treated as an empty
 785                 // object
 786                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 787                         add( prefix, "" );
 788
 789                 // Serialize object item.
 790                 } else {
 791                         for ( var name in obj ) {
 792                                 buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
 793                         }
 794                 }
 795
 796         } else {
 797                 // Serialize scalar item.
 798                 add( prefix, obj );
 799         }
 800 }
 801
 802 // This is still on the jQuery object... for now
 803 // Want to move this to jQuery.ajax some day
 804 jQuery.extend({
 805
 806         // Counter for holding the number of active queries
 807         active: 0,
 808
 809         // Last-Modified header cache for next request
 810         lastModified: {},
 811         etag: {}
 812
 813 });
 814
 815 /* Handles responses to an ajax request:
 816  * - sets all responseXXX fields accordingly
 817  * - finds the right dataType (mediates between content-type and expected dataType)
 818  * - returns the corresponding response
 819  */
 820 function ajaxHandleResponses( s, jqXHR, responses ) {
 821
 822         var contents = s.contents,
 823                 dataTypes = s.dataTypes,
 824                 responseFields = s.responseFields,
 825                 ct,
 826                 type,
 827                 finalDataType,
 828                 firstDataType;
 829
 830         // Fill responseXXX fields
 831         for( type in responseFields ) {
 832                 if ( type in responses ) {
 833                         jqXHR[ responseFields[type] ] = responses[ type ];
 834                 }
 835         }
 836
 837         // Remove auto dataType and get content-type in the process
 838         while( dataTypes[ 0 ] === "*" ) {
 839                 dataTypes.shift();
 840                 if ( ct === undefined ) {
 841                         ct = s.mimeType || jqXHR.getResponseHeader( "content-type" );
 842                 }
 843         }
 844
 845         // Check if we're dealing with a known content-type
 846         if ( ct ) {
 847                 for ( type in contents ) {
 848                         if ( contents[ type ] && contents[ type ].test( ct ) ) {
 849                                 dataTypes.unshift( type );
 850                                 break;
 851                         }
 852                 }
 853         }
 854
 855         // Check to see if we have a response for the expected dataType
 856         if ( dataTypes[ 0 ] in responses ) {
 857                 finalDataType = dataTypes[ 0 ];
 858         } else {
 859                 // Try convertible dataTypes
 860                 for ( type in responses ) {
 861                         if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
 862                                 finalDataType = type;
 863                                 break;
 864                         }
 865                         if ( !firstDataType ) {
 866                                 firstDataType = type;
 867                         }
 868                 }
 869                 // Or just use first one
 870                 finalDataType = finalDataType || firstDataType;
 871         }
 872
 873         // If we found a dataType
 874         // We add the dataType to the list if needed
 875         // and return the corresponding response
 876         if ( finalDataType ) {
 877                 if ( finalDataType !== dataTypes[ 0 ] ) {
 878                         dataTypes.unshift( finalDataType );
 879                 }
 880                 return responses[ finalDataType ];
 881         }
 882 }
 883
 884 // Chain conversions given the request and the original response
 885 function ajaxConvert( s, response ) {
 886
 887         // Apply the dataFilter if provided
 888         if ( s.dataFilter ) {
 889                 response = s.dataFilter( response, s.dataType );
 890         }
 891
 892         var dataTypes = s.dataTypes,
 893                 converters = {},
 894                 i,
 895                 key,
 896                 length = dataTypes.length,
 897                 tmp,
 898                 // Current and previous dataTypes
 899                 current = dataTypes[ 0 ],
 900                 prev,
 901                 // Conversion expression
 902                 conversion,
 903                 // Conversion function
 904                 conv,
 905                 // Conversion functions (transitive conversion)
 906                 conv1,
 907                 conv2;
 908
 909         // For each dataType in the chain
 910         for( i = 1; i < length; i++ ) {
 911
 912                 // Create converters map
 913                 // with lowercased keys
 914                 if ( i === 1 ) {
 915                         for( key in s.converters ) {
 916                                 if( typeof key === "string" ) {
 917                                         converters[ key.toLowerCase() ] = s.converters[ key ];
 918                                 }
 919                         }
 920                 }
 921
 922                 // Get the dataTypes
 923                 prev = current;
 924                 current = dataTypes[ i ];
 925
 926                 // If current is auto dataType, update it to prev
 927                 if( current === "*" ) {
 928                         current = prev;
 929                 // If no auto and dataTypes are actually different
 930                 } else if ( prev !== "*" && prev !== current ) {
 931
 932                         // Get the converter
 933                         conversion = prev + " " + current;
 934                         conv = converters[ conversion ] || converters[ "* " + current ];
 935
 936                         // If there is no direct converter, search transitively
 937                         if ( !conv ) {
 938                                 conv2 = undefined;
 939                                 for( conv1 in converters ) {
 940                                         tmp = conv1.split( " " );
 941                                         if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
 942                                                 conv2 = converters[ tmp[1] + " " + current ];
 943                                                 if ( conv2 ) {
 944                                                         conv1 = converters[ conv1 ];
 945                                                         if ( conv1 === true ) {
 946                                                                 conv = conv2;
 947                                                         } else if ( conv2 === true ) {
 948                                                                 conv = conv1;
 949                                                         }
 950                                                         break;
 951                                                 }
 952                                         }
 953                                 }
 954                         }
 955                         // If we found no converter, dispatch an error
 956                         if ( !( conv || conv2 ) ) {
 957                                 jQuery.error( "No conversion from " + conversion.replace(" "," to ") );
 958                         }
 959                         // If found converter is not an equivalence
 960                         if ( conv !== true ) {
 961                                 // Convert with 1 or 2 converters accordingly
 962                                 response = conv ? conv( response ) : conv2( conv1(response) );
 963                         }
 964                 }
 965         }
 966         return response;
 967 }
 968
 969 })( jQuery );