src/ajax.js

   1 (function( jQuery ) {
   2
   3 var r20 = /%20/g,
   4         rbracket = /\[\]$/,
   5         rCRLF = /\r?\n/g,
   6         rhash = /#.*$/,
   7         rheaders = /^(.*?):[ \t]*([^\r\n]*)\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 = /^(?:about|app|app\-storage|.+\-extension|file|widget):$/,
  11         rnoContent = /^(?:GET|HEAD)$/,
  12         rprotocol = /^\/\//,
  13         rquery = /\?/,
  14         rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
  15         rselectTextarea = /^(?:select|textarea)/i,
  16         rspacesAjax = /\s+/,
  17         rts = /([?&])_=[^&]*/,
  18         rucHeaders = /(^|\-)([a-z])/g,
  19         rucHeadersFunc = function( _, $1, $2 ) {
  20                 return $1 + $2.toUpperCase();
  21         },
  22         rurl = /^([\w\+\.\-]+:)(?:\/\/([^\/?#:]*)(?::(\d+))?)?/,
  23
  24         // Keep a copy of the old load method
  25         _load = jQuery.fn.load,
  26
  27         /* Prefilters
  28          * 1) They are useful to introduce custom dataTypes (see ajax/jsonp.js for an example)
  29          * 2) These are called:
  30          *    - BEFORE asking for a transport
  31          *    - AFTER param serialization (s.data is a string if s.processData is true)
  32          * 3) key is the dataType
  33          * 4) the catchall symbol "*" can be used
  34          * 5) execution will start with transport dataType and THEN continue down to "*" if needed
  35          */
  36         prefilters = {},
  37
  38         /* Transports bindings
  39          * 1) key is the dataType
  40          * 2) the catchall symbol "*" can be used
  41          * 3) selection will start with transport dataType and THEN go to "*" if needed
  42          */
  43         transports = {},
  44
  45         // Document location
  46         ajaxLocation,
  47
  48         // Document location segments
  49         ajaxLocParts;
  50
  51 // #8138, IE may throw an exception when accessing
  52 // a field from document.location if document.domain has been set
  53 try {
  54         ajaxLocation = document.location.href;
  55 } catch( e ) {
  56         // Use the href attribute of an A element
  57         // since IE will modify it given document.location
  58         ajaxLocation = document.createElement( "a" );
  59         ajaxLocation.href = "";
  60         ajaxLocation = ajaxLocation.href;
  61 }
  62
  63 // Segment location into parts
  64 ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() ) || [];
  65
  66 // Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
  67 function addToPrefiltersOrTransports( structure ) {
  68
  69         // dataTypeExpression is optional and defaults to "*"
  70         return function( dataTypeExpression, func ) {
  71
  72                 if ( typeof dataTypeExpression !== "string" ) {
  73                         func = dataTypeExpression;
  74                         dataTypeExpression = "*";
  75                 }
  76
  77                 if ( jQuery.isFunction( func ) ) {
  78                         var dataTypes = dataTypeExpression.toLowerCase().split( rspacesAjax ),
  79                                 i = 0,
  80                                 length = dataTypes.length,
  81                                 dataType,
  82                                 list,
  83                                 placeBefore;
  84
  85                         // For each dataType in the dataTypeExpression
  86                         for(; i < length; i++ ) {
  87                                 dataType = dataTypes[ i ];
  88                                 // We control if we're asked to add before
  89                                 // any existing element
  90                                 placeBefore = /^\+/.test( dataType );
  91                                 if ( placeBefore ) {
  92                                         dataType = dataType.substr( 1 ) || "*";
  93                                 }
  94                                 list = structure[ dataType ] = structure[ dataType ] || [];
  95                                 // then we add to the structure accordingly
  96                                 list[ placeBefore ? "unshift" : "push" ]( func );
  97                         }
  98                 }
  99         };
 100 }
 101
 102 //Base inspection function for prefilters and transports
 103 function inspectPrefiltersOrTransports( structure, options, originalOptions, jqXHR,
 104                 dataType /* internal */, inspected /* internal */ ) {
 105
 106         dataType = dataType || options.dataTypes[ 0 ];
 107         inspected = inspected || {};
 108
 109         inspected[ dataType ] = true;
 110
 111         var list = structure[ dataType ],
 112                 i = 0,
 113                 length = list ? list.length : 0,
 114                 executeOnly = ( structure === prefilters ),
 115                 selection;
 116
 117         for(; i < length && ( executeOnly || !selection ); i++ ) {
 118                 selection = list[ i ]( options, originalOptions, jqXHR );
 119                 // If we got redirected to another dataType
 120                 // we try there if executing only and not done already
 121                 if ( typeof selection === "string" ) {
 122                         if ( !executeOnly || inspected[ selection ] ) {
 123                                 selection = undefined;
 124                         } else {
 125                                 options.dataTypes.unshift( selection );
 126                                 selection = inspectPrefiltersOrTransports(
 127                                                 structure, options, originalOptions, jqXHR, selection, inspected );
 128                         }
 129                 }
 130         }
 131         // If we're only executing or nothing was selected
 132         // we try the catchall dataType if not done already
 133         if ( ( executeOnly || !selection ) && !inspected[ "*" ] ) {
 134                 selection = inspectPrefiltersOrTransports(
 135                                 structure, options, originalOptions, jqXHR, "*", inspected );
 136         }
 137         // unnecessary when only executing (prefilters)
 138         // but it'll be ignored by the caller in that case
 139         return selection;
 140 }
 141
 142 jQuery.fn.extend({
 143         load: function( url, params, callback ) {
 144                 if ( typeof url !== "string" && _load ) {
 145                         return _load.apply( this, arguments );
 146
 147                 // Don't do a request if no elements are being requested
 148                 } else if ( !this.length ) {
 149                         return this;
 150                 }
 151
 152                 var off = url.indexOf( " " );
 153                 if ( off >= 0 ) {
 154                         var selector = url.slice( off, url.length );
 155                         url = url.slice( 0, off );
 156                 }
 157
 158                 // Default to a GET request
 159                 var type = "GET";
 160
 161                 // If the second parameter was provided
 162                 if ( params ) {
 163                         // If it's a function
 164                         if ( jQuery.isFunction( params ) ) {
 165                                 // We assume that it's the callback
 166                                 callback = params;
 167                                 params = undefined;
 168
 169                         // Otherwise, build a param string
 170                         } else if ( typeof params === "object" ) {
 171                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
 172                                 type = "POST";
 173                         }
 174                 }
 175
 176                 var self = this;
 177
 178                 // Request the remote document
 179                 jQuery.ajax({
 180                         url: url,
 181                         type: type,
 182                         dataType: "html",
 183                         data: params,
 184                         // Complete callback (responseText is used internally)
 185                         complete: function( jqXHR, status, responseText ) {
 186                                 // Store the response as specified by the jqXHR object
 187                                 responseText = jqXHR.responseText;
 188                                 // If successful, inject the HTML into all the matched elements
 189                                 if ( jqXHR.isResolved() ) {
 190                                         // #4825: Get the actual response in case
 191                                         // a dataFilter is present in ajaxSettings
 192                                         jqXHR.done(function( r ) {
 193                                                 responseText = r;
 194                                         });
 195                                         // See if a selector was specified
 196                                         self.html( selector ?
 197                                                 // Create a dummy div to hold the results
 198                                                 jQuery("<div>")
 199                                                         // inject the contents of the document in, removing the scripts
 200                                                         // to avoid any 'Permission Denied' errors in IE
 201                                                         .append(responseText.replace(rscript, ""))
 202
 203                                                         // Locate the specified elements
 204                                                         .find(selector) :
 205
 206                                                 // If not, just inject the full result
 207                                                 responseText );
 208                                 }
 209
 210                                 if ( callback ) {
 211                                         self.each( callback, [ responseText, status, jqXHR ] );
 212                                 }
 213                         }
 214                 });
 215
 216                 return this;
 217         },
 218
 219         serialize: function() {
 220                 return jQuery.param( this.serializeArray() );
 221         },
 222
 223         serializeArray: function() {
 224                 return this.map(function(){
 225                         return this.elements ? jQuery.makeArray( this.elements ) : this;
 226                 })
 227                 .filter(function(){
 228                         return this.name && !this.disabled &&
 229                                 ( this.checked || rselectTextarea.test( this.nodeName ) ||
 230                                         rinput.test( this.type ) );
 231                 })
 232                 .map(function( i, elem ){
 233                         var val = jQuery( this ).val();
 234
 235                         return val == null ?
 236                                 null :
 237                                 jQuery.isArray( val ) ?
 238                                         jQuery.map( val, function( val, i ){
 239                                                 return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 240                                         }) :
 241                                         { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 242                 }).get();
 243         }
 244 });
 245
 246 // Attach a bunch of functions for handling common AJAX events
 247 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split( " " ), function( i, o ){
 248         jQuery.fn[ o ] = function( f ){
 249                 return this.bind( o, f );
 250         };
 251 } );
 252
 253 jQuery.each( [ "get", "post" ], function( i, method ) {
 254         jQuery[ method ] = function( url, data, callback, type ) {
 255                 // shift arguments if data argument was omitted
 256                 if ( jQuery.isFunction( data ) ) {
 257                         type = type || callback;
 258                         callback = data;
 259                         data = undefined;
 260                 }
 261
 262                 return jQuery.ajax({
 263                         type: method,
 264                         url: url,
 265                         data: data,
 266                         success: callback,
 267                         dataType: type
 268                 });
 269         };
 270 } );
 271
 272 jQuery.extend({
 273
 274         getScript: function( url, callback ) {
 275                 return jQuery.get( url, undefined, callback, "script" );
 276         },
 277
 278         getJSON: function( url, data, callback ) {
 279                 return jQuery.get( url, data, callback, "json" );
 280         },
 281
 282         // Creates a full fledged settings object into target
 283         // with both ajaxSettings and settings fields.
 284         // If target is omitted, writes into ajaxSettings.
 285         ajaxSetup: function ( target, settings ) {
 286                 if ( !settings ) {
 287                         // Only one parameter, we extend ajaxSettings
 288                         settings = target;
 289                         target = jQuery.extend( true, jQuery.ajaxSettings, settings );
 290                 } else {
 291                         // target was provided, we extend into it
 292                         jQuery.extend( true, target, jQuery.ajaxSettings, settings );
 293                 }
 294                 // Flatten fields we don't want deep extended
 295                 for( var field in { context: 1, url: 1 } ) {
 296                         if ( field in settings ) {
 297                                 target[ field ] = settings[ field ];
 298                         } else if( field in jQuery.ajaxSettings ) {
 299                                 target[ field ] = jQuery.ajaxSettings[ field ];
 300                         }
 301                 }
 302                 return target;
 303         },
 304
 305         ajaxSettings: {
 306                 url: ajaxLocation,
 307                 isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ),
 308                 global: true,
 309                 type: "GET",
 310                 contentType: "application/x-www-form-urlencoded",
 311                 processData: true,
 312                 async: true,
 313                 /*
 314                 timeout: 0,
 315                 data: null,
 316                 dataType: null,
 317                 username: null,
 318                 password: null,
 319                 cache: null,
 320                 traditional: false,
 321                 headers: {},
 322                 crossDomain: null,
 323                 */
 324
 325                 accepts: {
 326                         xml: "application/xml, text/xml",
 327                         html: "text/html",
 328                         text: "text/plain",
 329                         json: "application/json, text/javascript",
 330                         "*": "*/*"
 331                 },
 332
 333                 contents: {
 334                         xml: /xml/,
 335                         html: /html/,
 336                         json: /json/
 337                 },
 338
 339                 responseFields: {
 340                         xml: "responseXML",
 341                         text: "responseText"
 342                 },
 343
 344                 // List of data converters
 345                 // 1) key format is "source_type destination_type" (a single space in-between)
 346                 // 2) the catchall symbol "*" can be used for source_type
 347                 converters: {
 348
 349                         // Convert anything to text
 350                         "* text": window.String,
 351
 352                         // Text to html (true = no transformation)
 353                         "text html": true,
 354
 355                         // Evaluate text as a json expression
 356                         "text json": jQuery.parseJSON,
 357
 358                         // Parse text as xml
 359                         "text xml": jQuery.parseXML
 360                 }
 361         },
 362
 363         ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
 364         ajaxTransport: addToPrefiltersOrTransports( transports ),
 365
 366         // Main method
 367         ajax: function( url, options ) {
 368
 369                 // If url is an object, simulate pre-1.5 signature
 370                 if ( typeof url === "object" ) {
 371                         options = url;
 372                         url = undefined;
 373                 }
 374
 375                 // Force options to be an object
 376                 options = options || {};
 377
 378                 var // Create the final options object
 379                         s = jQuery.ajaxSetup( {}, options ),
 380                         // Callbacks context
 381                         callbackContext = s.context || s,
 382                         // Context for global events
 383                         // It's the callbackContext if one was provided in the options
 384                         // and if it's a DOM node or a jQuery collection
 385                         globalEventContext = callbackContext !== s &&
 386                                 ( callbackContext.nodeType || callbackContext instanceof jQuery ) ?
 387                                                 jQuery( callbackContext ) : jQuery.event,
 388                         // Deferreds
 389                         deferred = jQuery.Deferred(),
 390                         completeDeferred = jQuery._Deferred(),
 391                         // Status-dependent callbacks
 392                         statusCode = s.statusCode || {},
 393                         // ifModified key
 394                         ifModifiedKey,
 395                         // Headers (they are sent all at once)
 396                         requestHeaders = {},
 397                         // Response headers
 398                         responseHeadersString,
 399                         responseHeaders,
 400                         // transport
 401                         transport,
 402                         // timeout handle
 403                         timeoutTimer,
 404                         // Cross-domain detection vars
 405                         parts,
 406                         // The jqXHR state
 407                         state = 0,
 408                         // To know if global events are to be dispatched
 409                         fireGlobals,
 410                         // Loop variable
 411                         i,
 412                         // Fake xhr
 413                         jqXHR = {
 414
 415                                 readyState: 0,
 416
 417                                 // Caches the header
 418                                 setRequestHeader: function( name, value ) {
 419                                         if ( !state ) {
 420                                                 requestHeaders[ name.toLowerCase().replace( rucHeaders, rucHeadersFunc ) ] = value;
 421                                         }
 422                                         return this;
 423                                 },
 424
 425                                 // Raw string
 426                                 getAllResponseHeaders: function() {
 427                                         return state === 2 ? responseHeadersString : null;
 428                                 },
 429
 430                                 // Builds headers hashtable if needed
 431                                 getResponseHeader: function( key ) {
 432                                         var match;
 433                                         if ( state === 2 ) {
 434                                                 if ( !responseHeaders ) {
 435                                                         responseHeaders = {};
 436                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 437                                                                 responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
 438                                                         }
 439                                                 }
 440                                                 match = responseHeaders[ key.toLowerCase() ];
 441                                         }
 442                                         return match === undefined ? null : match;
 443                                 },
 444
 445                                 // Overrides response content-type header
 446                                 overrideMimeType: function( type ) {
 447                                         if ( !state ) {
 448                                                 s.mimeType = type;
 449                                         }
 450                                         return this;
 451                                 },
 452
 453                                 // Cancel the request
 454                                 abort: function( statusText ) {
 455                                         statusText = statusText || "abort";
 456                                         if ( transport ) {
 457                                                 transport.abort( statusText );
 458                                         }
 459                                         done( 0, statusText );
 460                                         return this;
 461                                 }
 462                         };
 463
 464                 // Callback for when everything is done
 465                 // It is defined here because jslint complains if it is declared
 466                 // at the end of the function (which would be more logical and readable)
 467                 function done( status, statusText, responses, headers ) {
 468
 469                         // Called once
 470                         if ( state === 2 ) {
 471                                 return;
 472                         }
 473
 474                         // State is "done" now
 475                         state = 2;
 476
 477                         // Clear timeout if it exists
 478                         if ( timeoutTimer ) {
 479                                 clearTimeout( timeoutTimer );
 480                         }
 481
 482                         // Dereference transport for early garbage collection
 483                         // (no matter how long the jqXHR object will be used)
 484                         transport = undefined;
 485
 486                         // Cache response headers
 487                         responseHeadersString = headers || "";
 488
 489                         // Set readyState
 490                         jqXHR.readyState = status ? 4 : 0;
 491
 492                         var isSuccess,
 493                                 success,
 494                                 error,
 495                                 response = responses ? ajaxHandleResponses( s, jqXHR, responses ) : undefined,
 496                                 lastModified,
 497                                 etag;
 498
 499                         // If successful, handle type chaining
 500                         if ( status >= 200 && status < 300 || status === 304 ) {
 501
 502                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 503                                 if ( s.ifModified ) {
 504
 505                                         if ( ( lastModified = jqXHR.getResponseHeader( "Last-Modified" ) ) ) {
 506                                                 jQuery.lastModified[ ifModifiedKey ] = lastModified;
 507                                         }
 508                                         if ( ( etag = jqXHR.getResponseHeader( "Etag" ) ) ) {
 509                                                 jQuery.etag[ ifModifiedKey ] = etag;
 510                                         }
 511                                 }
 512
 513                                 // If not modified
 514                                 if ( status === 304 ) {
 515
 516                                         statusText = "notmodified";
 517                                         isSuccess = true;
 518
 519                                 // If we have data
 520                                 } else {
 521
 522                                         try {
 523                                                 success = ajaxConvert( s, response );
 524                                                 statusText = "success";
 525                                                 isSuccess = true;
 526                                         } catch(e) {
 527                                                 // We have a parsererror
 528                                                 statusText = "parsererror";
 529                                                 error = e;
 530                                         }
 531                                 }
 532                         } else {
 533                                 // We extract error from statusText
 534                                 // then normalize statusText and status for non-aborts
 535                                 error = statusText;
 536                                 if( !statusText || status ) {
 537                                         statusText = "error";
 538                                         if ( status < 0 ) {
 539                                                 status = 0;
 540                                         }
 541                                 }
 542                         }
 543
 544                         // Set data for the fake xhr object
 545                         jqXHR.status = status;
 546                         jqXHR.statusText = statusText;
 547
 548                         // Success/Error
 549                         if ( isSuccess ) {
 550                                 deferred.resolveWith( callbackContext, [ success, statusText, jqXHR ] );
 551                         } else {
 552                                 deferred.rejectWith( callbackContext, [ jqXHR, statusText, error ] );
 553                         }
 554
 555                         // Status-dependent callbacks
 556                         jqXHR.statusCode( statusCode );
 557                         statusCode = undefined;
 558
 559                         if ( fireGlobals ) {
 560                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ),
 561                                                 [ jqXHR, s, isSuccess ? success : error ] );
 562                         }
 563
 564                         // Complete
 565                         completeDeferred.resolveWith( callbackContext, [ jqXHR, statusText ] );
 566
 567                         if ( fireGlobals ) {
 568                                 globalEventContext.trigger( "ajaxComplete", [ jqXHR, s] );
 569                                 // Handle the global AJAX counter
 570                                 if ( !( --jQuery.active ) ) {
 571                                         jQuery.event.trigger( "ajaxStop" );
 572                                 }
 573                         }
 574                 }
 575
 576                 // Attach deferreds
 577                 deferred.promise( jqXHR );
 578                 jqXHR.success = jqXHR.done;
 579                 jqXHR.error = jqXHR.fail;
 580                 jqXHR.complete = completeDeferred.done;
 581
 582                 // Status-dependent callbacks
 583                 jqXHR.statusCode = function( map ) {
 584                         if ( map ) {
 585                                 var tmp;
 586                                 if ( state < 2 ) {
 587                                         for( tmp in map ) {
 588                                                 statusCode[ tmp ] = [ statusCode[tmp], map[tmp] ];
 589                                         }
 590                                 } else {
 591                                         tmp = map[ jqXHR.status ];
 592                                         jqXHR.then( tmp, tmp );
 593                                 }
 594                         }
 595                         return this;
 596                 };
 597
 598                 // Remove hash character (#7531: and string promotion)
 599                 // Add protocol if not provided (#5866: IE7 issue with protocol-less urls)
 600                 // We also use the url parameter if available
 601                 s.url = ( ( url || s.url ) + "" ).replace( rhash, "" ).replace( rprotocol, ajaxLocParts[ 1 ] + "//" );
 602
 603                 // Extract dataTypes list
 604                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
 605
 606                 // Determine if a cross-domain request is in order
 607                 if ( !s.crossDomain ) {
 608                         parts = rurl.exec( s.url.toLowerCase() );
 609                         s.crossDomain = !!( parts &&
 610                                 ( parts[ 1 ] != ajaxLocParts[ 1 ] || parts[ 2 ] != ajaxLocParts[ 2 ] ||
 611                                         ( parts[ 3 ] || ( parts[ 1 ] === "http:" ? 80 : 443 ) ) !=
 612                                                 ( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? 80 : 443 ) ) )
 613                         );
 614                 }
 615
 616                 // Convert data if not already a string
 617                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 618                         s.data = jQuery.param( s.data, s.traditional );
 619                 }
 620
 621                 // Apply prefilters
 622                 inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );
 623
 624                 // If request was aborted inside a prefiler, stop there
 625                 if ( state === 2 ) {
 626                         return false;
 627                 }
 628
 629                 // We can fire global events as of now if asked to
 630                 fireGlobals = s.global;
 631
 632                 // Uppercase the type
 633                 s.type = s.type.toUpperCase();
 634
 635                 // Determine if request has content
 636                 s.hasContent = !rnoContent.test( s.type );
 637
 638                 // Watch for a new set of requests
 639                 if ( fireGlobals && jQuery.active++ === 0 ) {
 640                         jQuery.event.trigger( "ajaxStart" );
 641                 }
 642
 643                 // More options handling for requests with no content
 644                 if ( !s.hasContent ) {
 645
 646                         // If data is available, append data to url
 647                         if ( s.data ) {
 648                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 649                         }
 650
 651                         // Get ifModifiedKey before adding the anti-cache parameter
 652                         ifModifiedKey = s.url;
 653
 654                         // Add anti-cache in url if needed
 655                         if ( s.cache === false ) {
 656
 657                                 var ts = jQuery.now(),
 658                                         // try replacing _= if it is there
 659                                         ret = s.url.replace( rts, "$1_=" + ts );
 660
 661                                 // if nothing was replaced, add timestamp to the end
 662                                 s.url = ret + ( (ret === s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "" );
 663                         }
 664                 }
 665
 666                 // Set the correct header, if data is being sent
 667                 if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 668                         requestHeaders[ "Content-Type" ] = s.contentType;
 669                 }
 670
 671                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 672                 if ( s.ifModified ) {
 673                         ifModifiedKey = ifModifiedKey || s.url;
 674                         if ( jQuery.lastModified[ ifModifiedKey ] ) {
 675                                 requestHeaders[ "If-Modified-Since" ] = jQuery.lastModified[ ifModifiedKey ];
 676                         }
 677                         if ( jQuery.etag[ ifModifiedKey ] ) {
 678                                 requestHeaders[ "If-None-Match" ] = jQuery.etag[ ifModifiedKey ];
 679                         }
 680                 }
 681
 682                 // Set the Accepts header for the server, depending on the dataType
 683                 requestHeaders.Accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
 684                         s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 685                         s.accepts[ "*" ];
 686
 687                 // Check for headers option
 688                 for ( i in s.headers ) {
 689                         jqXHR.setRequestHeader( i, s.headers[ i ] );
 690                 }
 691
 692                 // Allow custom headers/mimetypes and early abort
 693                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jqXHR, s ) === false || state === 2 ) ) {
 694                                 // Abort if not done already
 695                                 jqXHR.abort();
 696                                 return false;
 697
 698                 }
 699
 700                 // Install callbacks on deferreds
 701                 for ( i in { success: 1, error: 1, complete: 1 } ) {
 702                         jqXHR[ i ]( s[ i ] );
 703                 }
 704
 705                 // Get transport
 706                 transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );
 707
 708                 // If no transport, we auto-abort
 709                 if ( !transport ) {
 710                         done( -1, "No Transport" );
 711                 } else {
 712                         jqXHR.readyState = 1;
 713                         // Send global event
 714                         if ( fireGlobals ) {
 715                                 globalEventContext.trigger( "ajaxSend", [ jqXHR, s ] );
 716                         }
 717                         // Timeout
 718                         if ( s.async && s.timeout > 0 ) {
 719                                 timeoutTimer = setTimeout( function(){
 720                                         jqXHR.abort( "timeout" );
 721                                 }, s.timeout );
 722                         }
 723
 724                         try {
 725                                 state = 1;
 726                                 transport.send( requestHeaders, done );
 727                         } catch (e) {
 728                                 // Propagate exception as error if not done
 729                                 if ( status < 2 ) {
 730                                         done( -1, e );
 731                                 // Simply rethrow otherwise
 732                                 } else {
 733                                         jQuery.error( e );
 734                                 }
 735                         }
 736                 }
 737
 738                 return jqXHR;
 739         },
 740
 741         // Serialize an array of form elements or a set of
 742         // key/values into a query string
 743         param: function( a, traditional ) {
 744                 var s = [],
 745                         add = function( key, value ) {
 746                                 // If value is a function, invoke it and return its value
 747                                 value = jQuery.isFunction( value ) ? value() : value;
 748                                 s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
 749                         };
 750
 751                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 752                 if ( traditional === undefined ) {
 753                         traditional = jQuery.ajaxSettings.traditional;
 754                 }
 755
 756                 // If an array was passed in, assume that it is an array of form elements.
 757                 if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
 758                         // Serialize the form elements
 759                         jQuery.each( a, function() {
 760                                 add( this.name, this.value );
 761                         } );
 762
 763                 } else {
 764                         // If traditional, encode the "old" way (the way 1.3.2 or older
 765                         // did it), otherwise encode params recursively.
 766                         for ( var prefix in a ) {
 767                                 buildParams( prefix, a[ prefix ], traditional, add );
 768                         }
 769                 }
 770
 771                 // Return the resulting serialization
 772                 return s.join( "&" ).replace( r20, "+" );
 773         }
 774 });
 775
 776 function buildParams( prefix, obj, traditional, add ) {
 777         if ( jQuery.isArray( obj ) && obj.length ) {
 778                 // Serialize array item.
 779                 jQuery.each( obj, function( i, v ) {
 780                         if ( traditional || rbracket.test( prefix ) ) {
 781                                 // Treat each array item as a scalar.
 782                                 add( prefix, v );
 783
 784                         } else {
 785                                 // If array item is non-scalar (array or object), encode its
 786                                 // numeric index to resolve deserialization ambiguity issues.
 787                                 // Note that rack (as of 1.0.0) can't currently deserialize
 788                                 // nested arrays properly, and attempting to do so may cause
 789                                 // a server error. Possible fixes are to modify rack's
 790                                 // deserialization algorithm or to provide an option or flag
 791                                 // to force array serialization to be shallow.
 792                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 793                         }
 794                 });
 795
 796         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 797                 // If we see an array here, it is empty and should be treated as an empty
 798                 // object
 799                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 800                         add( prefix, "" );
 801
 802                 // Serialize object item.
 803                 } else {
 804                         for ( var name in obj ) {
 805                                 buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
 806                         }
 807                 }
 808
 809         } else {
 810                 // Serialize scalar item.
 811                 add( prefix, obj );
 812         }
 813 }
 814
 815 // This is still on the jQuery object... for now
 816 // Want to move this to jQuery.ajax some day
 817 jQuery.extend({
 818
 819         // Counter for holding the number of active queries
 820         active: 0,
 821
 822         // Last-Modified header cache for next request
 823         lastModified: {},
 824         etag: {}
 825
 826 });
 827
 828 /* Handles responses to an ajax request:
 829  * - sets all responseXXX fields accordingly
 830  * - finds the right dataType (mediates between content-type and expected dataType)
 831  * - returns the corresponding response
 832  */
 833 function ajaxHandleResponses( s, jqXHR, responses ) {
 834
 835         var contents = s.contents,
 836                 dataTypes = s.dataTypes,
 837                 responseFields = s.responseFields,
 838                 ct,
 839                 type,
 840                 finalDataType,
 841                 firstDataType;
 842
 843         // Fill responseXXX fields
 844         for( type in responseFields ) {
 845                 if ( type in responses ) {
 846                         jqXHR[ responseFields[type] ] = responses[ type ];
 847                 }
 848         }
 849
 850         // Remove auto dataType and get content-type in the process
 851         while( dataTypes[ 0 ] === "*" ) {
 852                 dataTypes.shift();
 853                 if ( ct === undefined ) {
 854                         ct = s.mimeType || jqXHR.getResponseHeader( "content-type" );
 855                 }
 856         }
 857
 858         // Check if we're dealing with a known content-type
 859         if ( ct ) {
 860                 for ( type in contents ) {
 861                         if ( contents[ type ] && contents[ type ].test( ct ) ) {
 862                                 dataTypes.unshift( type );
 863                                 break;
 864                         }
 865                 }
 866         }
 867
 868         // Check to see if we have a response for the expected dataType
 869         if ( dataTypes[ 0 ] in responses ) {
 870                 finalDataType = dataTypes[ 0 ];
 871         } else {
 872                 // Try convertible dataTypes
 873                 for ( type in responses ) {
 874                         if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
 875                                 finalDataType = type;
 876                                 break;
 877                         }
 878                         if ( !firstDataType ) {
 879                                 firstDataType = type;
 880                         }
 881                 }
 882                 // Or just use first one
 883                 finalDataType = finalDataType || firstDataType;
 884         }
 885
 886         // If we found a dataType
 887         // We add the dataType to the list if needed
 888         // and return the corresponding response
 889         if ( finalDataType ) {
 890                 if ( finalDataType !== dataTypes[ 0 ] ) {
 891                         dataTypes.unshift( finalDataType );
 892                 }
 893                 return responses[ finalDataType ];
 894         }
 895 }
 896
 897 // Chain conversions given the request and the original response
 898 function ajaxConvert( s, response ) {
 899
 900         // Apply the dataFilter if provided
 901         if ( s.dataFilter ) {
 902                 response = s.dataFilter( response, s.dataType );
 903         }
 904
 905         var dataTypes = s.dataTypes,
 906                 converters = {},
 907                 i,
 908                 key,
 909                 length = dataTypes.length,
 910                 tmp,
 911                 // Current and previous dataTypes
 912                 current = dataTypes[ 0 ],
 913                 prev,
 914                 // Conversion expression
 915                 conversion,
 916                 // Conversion function
 917                 conv,
 918                 // Conversion functions (transitive conversion)
 919                 conv1,
 920                 conv2;
 921
 922         // For each dataType in the chain
 923         for( i = 1; i < length; i++ ) {
 924
 925                 // Create converters map
 926                 // with lowercased keys
 927                 if ( i === 1 ) {
 928                         for( key in s.converters ) {
 929                                 if( typeof key === "string" ) {
 930                                         converters[ key.toLowerCase() ] = s.converters[ key ];
 931                                 }
 932                         }
 933                 }
 934
 935                 // Get the dataTypes
 936                 prev = current;
 937                 current = dataTypes[ i ];
 938
 939                 // If current is auto dataType, update it to prev
 940                 if( current === "*" ) {
 941                         current = prev;
 942                 // If no auto and dataTypes are actually different
 943                 } else if ( prev !== "*" && prev !== current ) {
 944
 945                         // Get the converter
 946                         conversion = prev + " " + current;
 947                         conv = converters[ conversion ] || converters[ "* " + current ];
 948
 949                         // If there is no direct converter, search transitively
 950                         if ( !conv ) {
 951                                 conv2 = undefined;
 952                                 for( conv1 in converters ) {
 953                                         tmp = conv1.split( " " );
 954                                         if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
 955                                                 conv2 = converters[ tmp[1] + " " + current ];
 956                                                 if ( conv2 ) {
 957                                                         conv1 = converters[ conv1 ];
 958                                                         if ( conv1 === true ) {
 959                                                                 conv = conv2;
 960                                                         } else if ( conv2 === true ) {
 961                                                                 conv = conv1;
 962                                                         }
 963                                                         break;
 964                                                 }
 965                                         }
 966                                 }
 967                         }
 968                         // If we found no converter, dispatch an error
 969                         if ( !( conv || conv2 ) ) {
 970                                 jQuery.error( "No conversion from " + conversion.replace(" "," to ") );
 971                         }
 972                         // If found converter is not an equivalence
 973                         if ( conv !== true ) {
 974                                 // Convert with 1 or 2 converters accordingly
 975                                 response = conv ? conv( response ) : conv2( conv1(response) );
 976                         }
 977                 }
 978         }
 979         return response;
 980 }
 981
 982 })( jQuery );