src/ajax.js

   1 (function( jQuery ) {
   2
   3 var r20 = /%20/g,
   4         rbracket = /\[\]$/,
   5         rhash = /#.*$/,
   6         rheaders = /^(.*?):\s*(.*?)\r?$/mg, // IE leaves an \r character at EOL
   7         rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
   8         rnoContent = /^(?:GET|HEAD)$/,
   9         rquery = /\?/,
  10         rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
  11         rselectTextarea = /^(?:select|textarea)/i,
  12         rts = /([?&])_=[^&]*/,
  13         rurl = /^(\w+:)?\/\/([^\/?#:]+)(?::(\d+))?/,
  14         rCRLF = /\r?\n/g,
  15
  16         // Slice function
  17         sliceFunc = Array.prototype.slice,
  18
  19         // Keep a copy of the old load method
  20         _load = jQuery.fn.load;
  21
  22 jQuery.fn.extend({
  23         load: function( url, params, callback ) {
  24                 if ( typeof url !== "string" && _load ) {
  25                         return _load.apply( this, arguments );
  26
  27                 // Don't do a request if no elements are being requested
  28                 } else if ( !this.length ) {
  29                         return this;
  30                 }
  31
  32                 var off = url.indexOf(" ");
  33                 if ( off >= 0 ) {
  34                         var selector = url.slice(off, url.length);
  35                         url = url.slice(0, off);
  36                 }
  37
  38                 // Default to a GET request
  39                 var type = "GET";
  40
  41                 // If the second parameter was provided
  42                 if ( params ) {
  43                         // If it's a function
  44                         if ( jQuery.isFunction( params ) ) {
  45                                 // We assume that it's the callback
  46                                 callback = params;
  47                                 params = null;
  48
  49                         // Otherwise, build a param string
  50                         } else if ( typeof params === "object" ) {
  51                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
  52                                 type = "POST";
  53                         }
  54                 }
  55
  56                 var self = this;
  57
  58                 // Request the remote document
  59                 jQuery.ajax({
  60                         url: url,
  61                         type: type,
  62                         dataType: "html",
  63                         data: params,
  64                         // Complete callback (responseText is used internally)
  65                         complete: function( jXHR, status, responseText ) {
  66                                 // Store the response as specified by the jXHR object
  67                                 responseText = jXHR.responseText;
  68                                 // If successful, inject the HTML into all the matched elements
  69                                 if ( jXHR.isResolved() ) {
  70                                         // #4825: Get the actual response in case
  71                                         // a dataFilter is present in ajaxSettings
  72                                         jXHR.done(function( r ) {
  73                                                 responseText = r;
  74                                         });
  75                                         // See if a selector was specified
  76                                         self.html( selector ?
  77                                                 // Create a dummy div to hold the results
  78                                                 jQuery("<div>")
  79                                                         // inject the contents of the document in, removing the scripts
  80                                                         // to avoid any 'Permission Denied' errors in IE
  81                                                         .append(responseText.replace(rscript, ""))
  82
  83                                                         // Locate the specified elements
  84                                                         .find(selector) :
  85
  86                                                 // If not, just inject the full result
  87                                                 responseText );
  88                                 }
  89
  90                                 if ( callback ) {
  91                                         self.each( callback, [responseText, status, jXHR] );
  92                                 }
  93                         }
  94                 });
  95
  96                 return this;
  97         },
  98
  99         serialize: function() {
 100                 return jQuery.param(this.serializeArray());
 101         },
 102
 103         serializeArray: function() {
 104                 return this.map(function(){
 105                         return this.elements ? jQuery.makeArray(this.elements) : this;
 106                 })
 107                 .filter(function(){
 108                         return this.name && !this.disabled &&
 109                                 (this.checked || rselectTextarea.test(this.nodeName) ||
 110                                         rinput.test(this.type));
 111                 })
 112                 .map(function(i, elem){
 113                         var val = jQuery(this).val();
 114
 115                         return val == null ?
 116                                 null :
 117                                 jQuery.isArray(val) ?
 118                                         jQuery.map( val, function(val, i){
 119                                                 return { name: elem.name, value: val.replace(rCRLF, "\r\n") };
 120                                         }) :
 121                                         { name: elem.name, value: val.replace(rCRLF, "\r\n") };
 122                 }).get();
 123         }
 124 });
 125
 126 // Attach a bunch of functions for handling common AJAX events
 127 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function(i,o){
 128         jQuery.fn[o] = function(f){
 129                 return this.bind(o, f);
 130         };
 131 });
 132
 133 jQuery.each( [ "get", "post" ], function( i, method ) {
 134         jQuery[ method ] = function( url, data, callback, type ) {
 135                 // shift arguments if data argument was omited
 136                 if ( jQuery.isFunction( data ) ) {
 137                         type = type || callback;
 138                         callback = data;
 139                         data = null;
 140                 }
 141
 142                 return jQuery.ajax({
 143                         type: method,
 144                         url: url,
 145                         data: data,
 146                         success: callback,
 147                         dataType: type
 148                 });
 149         };
 150 });
 151
 152 jQuery.extend({
 153
 154         getScript: function( url, callback ) {
 155                 return jQuery.get(url, null, callback, "script");
 156         },
 157
 158         getJSON: function( url, data, callback ) {
 159                 return jQuery.get(url, data, callback, "json");
 160         },
 161
 162         ajaxSetup: function( settings ) {
 163                 jQuery.extend( true, jQuery.ajaxSettings, settings );
 164                 if ( settings.context ) {
 165                         jQuery.ajaxSettings.context = settings.context;
 166                 }
 167         },
 168
 169         ajaxSettings: {
 170                 url: location.href,
 171                 global: true,
 172                 type: "GET",
 173                 contentType: "application/x-www-form-urlencoded",
 174                 processData: true,
 175                 async: true,
 176                 /*
 177                 timeout: 0,
 178                 data: null,
 179                 dataType: null,
 180                 username: null,
 181                 password: null,
 182                 cache: null,
 183                 traditional: false,
 184                 headers: {},
 185                 crossDomain: null,
 186                 */
 187
 188                 accepts: {
 189                         xml: "application/xml, text/xml",
 190                         html: "text/html",
 191                         text: "text/plain",
 192                         json: "application/json, text/javascript",
 193                         "*": "*/*"
 194                 },
 195
 196                 contents: {
 197                         xml: /xml/,
 198                         html: /html/,
 199                         json: /json/
 200                 },
 201
 202                 responseFields: {
 203                         xml: "responseXML",
 204                         text: "responseText"
 205                 },
 206
 207                 // Prefilters
 208                 // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
 209                 // 2) These are called:
 210                 //    * BEFORE asking for a transport
 211                 //    * AFTER param serialization (s.data is a string if s.processData is true)
 212                 // 3) key is the dataType
 213                 // 4) the catchall symbol "*" can be used
 214                 // 5) execution will start with transport dataType and THEN continue down to "*" if needed
 215                 prefilters: {},
 216
 217                 // Transports bindings
 218                 // 1) key is the dataType
 219                 // 2) the catchall symbol "*" can be used
 220                 // 3) selection will start with transport dataType and THEN go to "*" if needed
 221                 transports: {},
 222
 223                 // List of data converters
 224                 // 1) key format is "source_type destination_type" (a single space in-between)
 225                 // 2) the catchall symbol "*" can be used for source_type
 226                 converters: {
 227
 228                         // Convert anything to text
 229                         "* text": window.String,
 230
 231                         // Text to html (true = no transformation)
 232                         "text html": true,
 233
 234                         // Evaluate text as a json expression
 235                         "text json": jQuery.parseJSON,
 236
 237                         // Parse text as xml
 238                         "text xml": jQuery.parseXML
 239                 }
 240         },
 241
 242         ajaxPrefilter: function( a , b ) {
 243                 ajaxPrefilterOrTransport( "prefilters" , a , b );
 244         },
 245
 246         ajaxTransport: function( a , b ) {
 247                 return ajaxPrefilterOrTransport( "transports" , a , b );
 248         },
 249
 250         // Main method
 251         ajax: function( url , options ) {
 252
 253                 // If options is not an object,
 254                 // we simulate pre-1.5 signature
 255                 if ( typeof( options ) !== "object" ) {
 256                         options = url;
 257                         url = undefined;
 258                 }
 259
 260                 // Force options to be an object
 261                 options = options || {};
 262
 263                 var // Create the final options object
 264                         s = jQuery.extend( true , {} , jQuery.ajaxSettings , options ),
 265                         // jQuery lists
 266                         jQuery_lastModified = jQuery.lastModified,
 267                         jQuery_etag = jQuery.etag,
 268                         // Callbacks contexts
 269                         // We force the original context if it exists
 270                         // or take it from jQuery.ajaxSettings otherwise
 271                         // (plain objects used as context get extended)
 272                         callbackContext =
 273                                 ( s.context = ( "context" in options ? options : jQuery.ajaxSettings ).context ) || s,
 274                         globalEventContext = callbackContext === s ? jQuery.event : jQuery( callbackContext ),
 275                         // Deferreds
 276                         deferred = jQuery.Deferred(),
 277                         completeDeferred = jQuery._Deferred(),
 278                         // Status-dependent callbacks
 279                         statusCode = s.statusCode || {},
 280                         // Headers (they are sent all at once)
 281                         requestHeaders = {},
 282                         // Response headers
 283                         responseHeadersString,
 284                         responseHeaders,
 285                         // transport
 286                         transport,
 287                         // timeout handle
 288                         timeoutTimer,
 289                         // Cross-domain detection vars
 290                         loc = document.location,
 291                         protocol = loc.protocol || "http:",
 292                         parts,
 293                         // The jXHR state
 294                         state = 0,
 295                         // Loop variable
 296                         i,
 297                         // Fake xhr
 298                         jXHR = {
 299
 300                                 readyState: 0,
 301
 302                                 // Caches the header
 303                                 setRequestHeader: function(name,value) {
 304                                         if ( state === 0 ) {
 305                                                 requestHeaders[ name.toLowerCase() ] = value;
 306                                         }
 307                                         return this;
 308                                 },
 309
 310                                 // Raw string
 311                                 getAllResponseHeaders: function() {
 312                                         return state === 2 ? responseHeadersString : null;
 313                                 },
 314
 315                                 // Builds headers hashtable if needed
 316                                 getResponseHeader: function( key ) {
 317
 318                                         var match;
 319
 320                                         if ( state === 2 ) {
 321
 322                                                 if ( !responseHeaders ) {
 323
 324                                                         responseHeaders = {};
 325
 326                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 327                                                                 responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
 328                                                         }
 329                                                 }
 330                                                 match = responseHeaders[ key.toLowerCase() ];
 331
 332                                         }
 333
 334                                         return match || null;
 335                                 },
 336
 337                                 // Cancel the request
 338                                 abort: function( statusText ) {
 339                                         if ( transport ) {
 340                                                 transport.abort( statusText || "abort" );
 341                                         }
 342                                         done( 0 , statusText );
 343                                         return this;
 344                                 }
 345                         };
 346
 347                 // Callback for when everything is done
 348                 // It is defined here because jslint complains if it is declared
 349                 // at the end of the function (which would be more logical and readable)
 350                 function done( status , statusText , responses , headers) {
 351
 352                         // Called once
 353                         if ( state === 2 ) {
 354                                 return;
 355                         }
 356
 357                         // State is "done" now
 358                         state = 2;
 359
 360                         // Dereference transport for early garbage collection
 361                         // (no matter how long the jXHR object will be used)
 362                         transport = undefined;
 363
 364                         // Set readyState
 365                         jXHR.readyState = status ? 4 : 0;
 366
 367                         // Cache response headers
 368                         responseHeadersString = headers || "";
 369
 370                         // Clear timeout if it exists
 371                         if ( timeoutTimer ) {
 372                                 clearTimeout(timeoutTimer);
 373                         }
 374
 375                         var // Reference dataTypes, converters and responseFields
 376                                 dataTypes = s.dataTypes,
 377                                 converters = s.converters,
 378                                 responseFields = s.responseFields,
 379                                 responseField,
 380
 381                                 // Flag to mark as success
 382                                 isSuccess,
 383                                 // Stored success
 384                                 success,
 385                                 // Stored error
 386                                 error,
 387
 388                                 // To keep track of statusCode based callbacks
 389                                 oldStatusCode,
 390
 391                                 // Actual response
 392                                 response;
 393
 394                         // If we got responses:
 395                         // - find the right one
 396                         // - update dataTypes accordingly
 397                         // - set responseXXX accordingly too
 398                         if ( responses ) {
 399
 400                                 var contents = s.contents,
 401                                         transportDataType = dataTypes[0],
 402                                         ct,
 403                                         type,
 404                                         finalDataType,
 405                                         firstDataType;
 406
 407                                 // Auto (xml, json, script or text determined given headers)
 408                                 if ( transportDataType === "*" ) {
 409
 410                                         // Remove all auto types
 411                                         while( dataTypes[0] === "*" ) {
 412                                                 dataTypes.shift();
 413                                         }
 414                                         transportDataTypes = dataTypes[0];
 415
 416                                         // Get content type
 417                                         ct = jXHR.getResponseHeader( "content-type" );
 418
 419                                         // Check if it's a known type
 420                                         for ( type in contents ) {
 421                                                 if ( contents[ type ] && contents[ type ].test( ct ) ) {
 422                                                         dataTypes.unshift( ( transportDataType = type ) );
 423                                                         break;
 424                                                 }
 425                                         }
 426                                 }
 427
 428                                 // Check to see if we have a response for the expected dataType
 429                                 if ( transportDataType in responses ) {
 430                                         finalDataType = transportDataType;
 431                                 } else {
 432                                         // Try convertible dataTypes
 433                                         for ( type in responses ) {
 434                                                 if ( ! firstDataType ) {
 435                                                         firstDataType = type;
 436                                                 }
 437                                                 if ( ! transportDataType || converters[ type + " " + transportDataType ] ) {
 438                                                         finalDataType = type;
 439                                                         break;
 440                                                 }
 441                                         }
 442                                         // Or just use first one
 443                                         finalDataType = finalDataType || firstDataType;
 444                                 }
 445
 446                                 // If we found a dataType
 447                                 // We get the corresponding response
 448                                 // and add the dataType to the list if needed
 449                                 if ( finalDataType ) {
 450                                         response = responses[ finalDataType ];
 451                                         if ( finalDataType !== transportDataType ) {
 452                                                 dataTypes.unshift( finalDataType );
 453                                         }
 454                                 }
 455
 456                                 // Fill responseXXX fields
 457                                 for( type in responseFields ) {
 458                                         if ( type in responses ) {
 459                                                 jXHR[ responseFields[ type ] ] = responses[ type ];
 460                                         }
 461                                 }
 462                         }
 463
 464                         // If successful, handle type chaining
 465                         if ( status >= 200 && status < 300 || status === 304 ) {
 466
 467                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 468                                 if ( s.ifModified ) {
 469
 470                                         var lastModified = jXHR.getResponseHeader("Last-Modified"),
 471                                                 etag = jXHR.getResponseHeader("Etag");
 472
 473                                         if (lastModified) {
 474                                                 jQuery_lastModified[ s.url ] = lastModified;
 475                                         }
 476                                         if (etag) {
 477                                                 jQuery_etag[ s.url ] = etag;
 478                                         }
 479                                 }
 480
 481                                 // If not modified
 482                                 if ( status === 304 ) {
 483
 484                                         statusText = "notmodified";
 485                                         isSuccess = 1;
 486
 487                                 // If we have data
 488                                 } else {
 489
 490                                         statusText = "success";
 491
 492                                         // Chain data conversions and determine the final value
 493                                         // (if an exception is thrown in the process, it'll be notified as an error)
 494                                         try {
 495
 496                                                 var i,
 497                                                         tmp,
 498                                                         // Current dataType
 499                                                         current,
 500                                                         // Previous dataType
 501                                                         prev,
 502                                                         // Conversion expression
 503                                                         conversion,
 504                                                         // Conversion function
 505                                                         conv,
 506                                                         // Conversion functions (when text is used in-between)
 507                                                         conv1,
 508                                                         conv2;
 509
 510                                                 // For each dataType in the chain
 511                                                 for( i = 0 ; i < dataTypes.length ; i++ ) {
 512
 513                                                         current = dataTypes[ i ];
 514
 515                                                         // If a responseXXX field for this dataType exists
 516                                                         // and if it hasn't been set yet
 517                                                         responseField = responseFields[ current ];
 518                                                         if ( responseField && ! ( responseField in jXHR ) ) {
 519                                                                 jXHR[ responseField ] = response;
 520                                                         }
 521
 522                                                         // If this is not the first element
 523                                                         if ( i ) {
 524
 525                                                                 // Get the dataType to convert from
 526                                                                 prev = dataTypes[ i - 1 ];
 527
 528                                                                 // If no auto and dataTypes are actually different
 529                                                                 if ( prev !== "*" && current !== "*" && prev !== current ) {
 530
 531                                                                         // Get the converter
 532                                                                         conversion = prev + " " + current;
 533                                                                         conv = converters[ conversion ] || converters[ "* " + current ];
 534
 535                                                                         // If there is no direct converter, search transitively
 536                                                                         if ( ! conv ) {
 537                                                                                 conv1 = conv2 = undefined;
 538
 539                                                                                 for( conv1 in converters ) {
 540                                                                                         tmp = conv1.split( " " );
 541                                                                                         if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
 542                                                                                                 conv2 = converters[ tmp[ 1 ] + " " + current ];
 543                                                                                                 if ( conv2 ) {
 544                                                                                                         conv1 = converters[ conv1 ];
 545                                                                                                         if ( conv1 === true ) {
 546                                                                                                                 conv = conv2;
 547                                                                                                         } else if ( conv2 === true ) {
 548                                                                                                                 conv = conv1;
 549                                                                                                         }
 550                                                                                                         break;
 551                                                                                                 }
 552                                                                                         }
 553                                                                                 }
 554                                                                         }
 555                                                                         // If we found no converter, dispatch an error
 556                                                                         if ( ! ( conv || conv1 && conv2 ) ) {
 557                                                                                 throw conversion;
 558                                                                         }
 559                                                                         // If found converter is not an equivalence
 560                                                                         if ( conv !== true ) {
 561                                                                                 // Convert with 1 or 2 converters accordingly
 562                                                                                 response = conv ? conv( response ) : conv2( conv1( response ) );
 563                                                                         }
 564                                                                 }
 565                                                         // If it is the first element of the chain
 566                                                         // and we have a dataFilter
 567                                                         } else if ( s.dataFilter ) {
 568                                                                 // Apply the dataFilter
 569                                                                 response = s.dataFilter( response , current );
 570                                                                 // Get dataTypes again in case the filter changed them
 571                                                                 dataTypes = s.dataTypes;
 572                                                         }
 573                                                 }
 574                                                 // End of loop
 575
 576                                                 // We have a real success
 577                                                 success = response;
 578                                                 isSuccess = 1;
 579
 580                                         // If an exception was thrown
 581                                         } catch(e) {
 582
 583                                                 // We have a parsererror
 584                                                 statusText = "parsererror";
 585                                                 error = "" + e;
 586
 587                                         }
 588                                 }
 589
 590                         // if not success, mark it as an error
 591                         } else {
 592                                         error = statusText = statusText || "error";
 593                         }
 594
 595                         // Set data for the fake xhr object
 596                         jXHR.status = status;
 597                         jXHR.statusText = statusText;
 598
 599                         // Success/Error
 600                         if ( isSuccess ) {
 601                                 deferred.resolveWith( callbackContext , [ success , statusText , jXHR ] );
 602                         } else {
 603                                 deferred.rejectWith( callbackContext , [ jXHR , statusText , error ] );
 604                         }
 605
 606                         // Status-dependent callbacks
 607                         oldStatusCode = statusCode;
 608                         statusCode = undefined;
 609                         jXHR.statusCode( oldStatusCode );
 610
 611                         if ( s.global ) {
 612                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
 613                                                 [ jXHR , s , isSuccess ? success : error ] );
 614                         }
 615
 616                         // Complete
 617                         completeDeferred.resolveWith( callbackContext, [ jXHR , statusText ] );
 618
 619                         if ( s.global ) {
 620                                 globalEventContext.trigger( "ajaxComplete" , [ jXHR , s] );
 621                                 // Handle the global AJAX counter
 622                                 if ( ! --jQuery.active ) {
 623                                         jQuery.event.trigger( "ajaxStop" );
 624                                 }
 625                         }
 626                 }
 627
 628                 // Attach deferreds
 629                 deferred.promise( jXHR );
 630                 jXHR.success = jXHR.done;
 631                 jXHR.error = jXHR.fail;
 632                 jXHR.complete = completeDeferred.done;
 633
 634                 // Status-dependent callbacks
 635                 jXHR.statusCode = function( map ) {
 636                         if ( map ) {
 637                                 var tmp;
 638                                 if ( statusCode ) {
 639                                         for( tmp in map ) {
 640                                                 statusCode[ tmp ] = [ statusCode[ tmp ] , map[ tmp ] ];
 641                                         }
 642                                 } else {
 643                                         tmp = map[ jXHR.status ];
 644                                         jXHR.done( tmp ).fail( tmp );
 645                                 }
 646                         }
 647                         return this;
 648                 };
 649
 650                 // Remove hash character (#7531: and string promotion)
 651                 // We also use the url parameter if available
 652                 s.url = ( "" + ( url || s.url ) ).replace( rhash , "" );
 653
 654                 // Extract dataTypes list
 655                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
 656
 657                 // Determine if a cross-domain request is in order
 658                 if ( ! s.crossDomain ) {
 659                         parts = rurl.exec( s.url.toLowerCase() );
 660                         s.crossDomain = !!(
 661                                         parts &&
 662                                         ( parts[ 1 ] && parts[ 1 ] != protocol ||
 663                                                 parts[ 2 ] != loc.hostname ||
 664                                                 ( parts[ 3 ] || ( ( parts[ 1 ] || protocol ) === "http:" ? 80 : 443 ) ) !=
 665                                                         ( loc.port || ( protocol === "http:" ? 80 : 443 ) ) )
 666                         );
 667                 }
 668
 669                 // Convert data if not already a string
 670                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 671                         s.data = jQuery.param( s.data , s.traditional );
 672                 }
 673
 674                 // Apply prefilters
 675                 jQuery.ajaxPrefilter( s , options );
 676
 677                 // Uppercase the type
 678                 s.type = s.type.toUpperCase();
 679
 680                 // Determine if request has content
 681                 s.hasContent = ! rnoContent.test( s.type );
 682
 683                 // Watch for a new set of requests
 684                 if ( s.global && jQuery.active++ === 0 ) {
 685                         jQuery.event.trigger( "ajaxStart" );
 686                 }
 687
 688                 // More options handling for requests with no content
 689                 if ( ! s.hasContent ) {
 690
 691                         // If data is available, append data to url
 692                         if ( s.data ) {
 693                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 694                         }
 695
 696                         // Add anti-cache in url if needed
 697                         if ( s.cache === false ) {
 698
 699                                 var ts = jQuery.now(),
 700                                         // try replacing _= if it is there
 701                                         ret = s.url.replace( rts , "$1_=" + ts );
 702
 703                                 // if nothing was replaced, add timestamp to the end
 704                                 s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
 705                         }
 706                 }
 707
 708                 // Set the correct header, if data is being sent
 709                 if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 710                         requestHeaders[ "content-type" ] = s.contentType;
 711                 }
 712
 713                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 714                 if ( s.ifModified ) {
 715                         if ( jQuery_lastModified[ s.url ] ) {
 716                                 requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
 717                         }
 718                         if ( jQuery_etag[ s.url ] ) {
 719                                 requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
 720                         }
 721                 }
 722
 723                 // Set the Accepts header for the server, depending on the dataType
 724                 requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
 725                         s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 726                         s.accepts[ "*" ];
 727
 728                 // Check for headers option
 729                 for ( i in s.headers ) {
 730                         requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
 731                 }
 732
 733                 // Allow custom headers/mimetypes and early abort
 734                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
 735
 736                                 // Abort if not done already
 737                                 done( 0 , "abort" );
 738
 739                                 // Return false
 740                                 jXHR = false;
 741
 742                 } else {
 743
 744                         // Install callbacks on deferreds
 745                         for ( i in { success:1, error:1, complete:1 } ) {
 746                                 jXHR[ i ]( s[ i ] );
 747                         }
 748
 749                         // Get transport
 750                         transport = jQuery.ajaxTransport( s , options );
 751
 752                         // If no transport, we auto-abort
 753                         if ( ! transport ) {
 754
 755                                 done( 0 , "notransport" );
 756
 757                         } else {
 758
 759                                 // Set state as sending
 760                                 state = jXHR.readyState = 1;
 761
 762                                 // Send global event
 763                                 if ( s.global ) {
 764                                         globalEventContext.trigger( "ajaxSend" , [ jXHR , s ] );
 765                                 }
 766
 767                                 // Timeout
 768                                 if ( s.async && s.timeout > 0 ) {
 769                                         timeoutTimer = setTimeout(function(){
 770                                                 jXHR.abort( "timeout" );
 771                                         }, s.timeout);
 772                                 }
 773
 774                                 // Try to send
 775                                 try {
 776                                         transport.send(requestHeaders, done);
 777                                 } catch (e) {
 778                                         // Propagate exception as error if not done
 779                                         if ( status === 1 ) {
 780
 781                                                 done(0, "error", "" + e);
 782                                                 jXHR = false;
 783
 784                                         // Simply rethrow otherwise
 785                                         } else {
 786                                                 jQuery.error(e);
 787                                         }
 788                                 }
 789                         }
 790                 }
 791
 792                 return jXHR;
 793         },
 794
 795         // Serialize an array of form elements or a set of
 796         // key/values into a query string
 797         param: function( a, traditional ) {
 798                 var s = [],
 799                         add = function( key, value ) {
 800                                 // If value is a function, invoke it and return its value
 801                                 value = jQuery.isFunction(value) ? value() : value;
 802                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 803                         };
 804
 805                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 806                 if ( traditional === undefined ) {
 807                         traditional = jQuery.ajaxSettings.traditional;
 808                 }
 809
 810                 // If an array was passed in, assume that it is an array of form elements.
 811                 if ( jQuery.isArray(a) || a.jquery ) {
 812                         // Serialize the form elements
 813                         jQuery.each( a, function() {
 814                                 add( this.name, this.value );
 815                         });
 816
 817                 } else {
 818                         // If traditional, encode the "old" way (the way 1.3.2 or older
 819                         // did it), otherwise encode params recursively.
 820                         for ( var prefix in a ) {
 821                                 buildParams( prefix, a[prefix], traditional, add );
 822                         }
 823                 }
 824
 825                 // Return the resulting serialization
 826                 return s.join("&").replace(r20, "+");
 827         }
 828 });
 829
 830 function buildParams( prefix, obj, traditional, add ) {
 831         if ( jQuery.isArray(obj) && obj.length ) {
 832                 // Serialize array item.
 833                 jQuery.each( obj, function( i, v ) {
 834                         if ( traditional || rbracket.test( prefix ) ) {
 835                                 // Treat each array item as a scalar.
 836                                 add( prefix, v );
 837
 838                         } else {
 839                                 // If array item is non-scalar (array or object), encode its
 840                                 // numeric index to resolve deserialization ambiguity issues.
 841                                 // Note that rack (as of 1.0.0) can't currently deserialize
 842                                 // nested arrays properly, and attempting to do so may cause
 843                                 // a server error. Possible fixes are to modify rack's
 844                                 // deserialization algorithm or to provide an option or flag
 845                                 // to force array serialization to be shallow.
 846                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 847                         }
 848                 });
 849
 850         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 851                 // If we see an array here, it is empty and should be treated as an empty
 852                 // object
 853                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 854                         add( prefix, "" );
 855
 856                 // Serialize object item.
 857                 } else {
 858                         jQuery.each( obj, function( k, v ) {
 859                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 860                         });
 861                 }
 862
 863         } else {
 864                 // Serialize scalar item.
 865                 add( prefix, obj );
 866         }
 867 }
 868
 869 // This is still on the jQuery object... for now
 870 // Want to move this to jQuery.ajax some day
 871 jQuery.extend({
 872
 873         // Counter for holding the number of active queries
 874         active: 0,
 875
 876         // Last-Modified header cache for next request
 877         lastModified: {},
 878         etag: {}
 879
 880 });
 881
 882 // Base function for both ajaxPrefilter and ajaxTransport
 883 function ajaxPrefilterOrTransport( arg0 , arg1 , arg2 ) {
 884
 885         var type = jQuery.type( arg1 ),
 886                 structure = jQuery.ajaxSettings[ arg0 ],
 887                 i,
 888                 length;
 889
 890         // We have an options map so we have to inspect the structure
 891         if ( type === "object" ) {
 892
 893                 var options = arg1,
 894                         originalOptions = arg2,
 895                         // When dealing with prefilters, we execute only
 896                         // (no selection so we never stop when a function
 897                         // returns a non-falsy, non-string value)
 898                         executeOnly = ( arg0 === "prefilters" ),
 899                         inspect = function( dataType, tested ) {
 900
 901                                 if ( ! tested[ dataType ] ) {
 902
 903                                         tested[ dataType ] = true;
 904
 905                                         var list = structure[ dataType ],
 906                                                 selected;
 907
 908                                         for( i = 0, length = list ? list.length : 0 ; ( executeOnly || ! selected ) && i < length ; i++ ) {
 909                                                 selected = list[ i ]( options , originalOptions );
 910                                                 // If we got redirected to a different dataType,
 911                                                 // we add it and switch to the corresponding list
 912                                                 if ( typeof( selected ) === "string" && selected !== dataType ) {
 913                                                         options.dataTypes.unshift( selected );
 914                                                         selected = inspect( selected , tested );
 915                                                         // We always break in order not to continue
 916                                                         // to iterate in previous list
 917                                                         break;
 918                                                 }
 919                                         }
 920                                         // If we're only executing or nothing was selected
 921                                         // we try the catchall dataType
 922                                         if ( executeOnly || ! selected ) {
 923                                                 selected = inspect( "*" , tested );
 924                                         }
 925                                         // This will be ignored by ajaxPrefilter
 926                                         // so it's safe to return no matter what
 927                                         return selected;
 928                                 }
 929
 930                         };
 931
 932                 // Start inspection with current transport dataType
 933                 return inspect( options.dataTypes[ 0 ] , {} );
 934
 935         } else {
 936
 937                 // We're requested to add to the structure
 938                 // Signature is ( dataTypeExpression , function )
 939                 // with dataTypeExpression being optional and
 940                 // defaulting to catchAll (*)
 941                 type = type === "function";
 942
 943                 if ( type ) {
 944                         arg2 = arg1;
 945                         arg1 = undefined;
 946                 }
 947                 arg1 = arg1 || "*";
 948
 949                 // We control that the second argument is really a function
 950                 if ( type || jQuery.isFunction( arg2 ) ) {
 951
 952                         var dataTypes = arg1.split( /\s+/ ),
 953                                 functor = arg2,
 954                                 dataType,
 955                                 list,
 956                                 placeBefore;
 957
 958                         // For each dataType in the dataTypeExpression
 959                         for( i = 0 , length = dataTypes.length ; i < length ; i++ ) {
 960                                 dataType = dataTypes[ i ];
 961                                 // We control if we're asked to add before
 962                                 // any existing element
 963                                 placeBefore = /^\+/.test( dataType );
 964                                 if ( placeBefore ) {
 965                                         dataType = dataType.substr( 1 );
 966                                 }
 967                                 list = structure[ dataType ] = structure[ dataType ] || [];
 968                                 // then we add to the structure accordingly
 969                                 list[ placeBefore ? "unshift" : "push" ]( functor );
 970                         }
 971                 }
 972         }
 973 }
 974
 975 })( jQuery );