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         },
 165
 166         ajaxSettings: {
 167                 url: location.href,
 168                 global: true,
 169                 type: "GET",
 170                 contentType: "application/x-www-form-urlencoded",
 171                 processData: true,
 172                 async: true,
 173                 /*
 174                 timeout: 0,
 175                 data: null,
 176                 dataType: null,
 177                 dataTypes: null,
 178                 username: null,
 179                 password: null,
 180                 cache: null,
 181                 traditional: false,
 182                 */
 183                 xhr: function() {
 184                         return new window.XMLHttpRequest();
 185                 },
 186
 187                 accepts: {
 188                         xml: "application/xml, text/xml",
 189                         html: "text/html",
 190                         text: "text/plain",
 191                         json: "application/json, text/javascript",
 192                         "*": "*/*"
 193                 },
 194
 195                 contents: {
 196                         xml: /xml/,
 197                         html: /html/,
 198                         json: /json/
 199                 },
 200
 201                 // Prefilters
 202                 // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
 203                 // 2) These are called:
 204                 //    * BEFORE asking for a transport
 205                 //    * AFTER param serialization (s.data is a string if s.processData is true)
 206                 // 3) key is the dataType
 207                 // 4) the catchall symbol "*" can be used
 208                 // 5) execution will start with transport dataType and THEN continue down to "*" if needed
 209                 prefilters: {},
 210
 211                 // Transports bindings
 212                 // 1) key is the dataType
 213                 // 2) the catchall symbol "*" can be used
 214                 // 3) selection will start with transport dataType and THEN go to "*" if needed
 215                 transports: {},
 216
 217                 // List of data converters
 218                 // 1) key format is "source_type destination_type" (a single space in-between)
 219                 // 2) the catchall symbol "*" can be used for source_type
 220                 converters: {
 221
 222                         // Convert anything to text
 223                         "* text": window.String,
 224
 225                         // Text to html (true = no transformation)
 226                         "text html": true,
 227
 228                         // Evaluate text as a json expression
 229                         "text json": jQuery.parseJSON,
 230
 231                         // Parse text as xml
 232                         "text xml": jQuery.parseXML
 233                 }
 234         },
 235
 236         // Main method
 237         // (s is used internally)
 238         ajax: function( url , options , s ) {
 239
 240                 // Handle varargs
 241                 if ( arguments.length === 1 ) {
 242                         options = url;
 243                         url = options ? options.url : undefined;
 244                 }
 245
 246                 // Force options to be an object
 247                 options = options || {};
 248
 249                 // Get the url if provided separately
 250                 options.url = url || options.url;
 251
 252                 // Create the final options object
 253                 s = jQuery.extend( true , {} , jQuery.ajaxSettings , options );
 254
 255                 // We force the original context
 256                 // (plain objects used as context get extended)
 257                 s.context = options.context;
 258
 259                 var // jQuery lists
 260                         jQuery_lastModified = jQuery.lastModified,
 261                         jQuery_etag = jQuery.etag,
 262                         // Callbacks contexts
 263                         callbackContext = s.context || s,
 264                         globalEventContext = s.context ? jQuery( s.context ) : jQuery.event,
 265                         // Deferreds
 266                         deferred = jQuery.Deferred(),
 267                         completeDeferred = jQuery._Deferred(),
 268                         // Status-dependent callbacks
 269                         statusCode = s.statusCode || {},
 270                         // Headers (they are sent all at once)
 271                         requestHeaders = {},
 272                         // Response headers
 273                         responseHeadersString,
 274                         responseHeaders,
 275                         // transport
 276                         transport,
 277                         // timeout handle
 278                         timeoutTimer,
 279                         // Cross-domain detection vars
 280                         loc = document.location,
 281                         parts,
 282                         // The jXHR state
 283                         state = 0,
 284                         // Loop variable
 285                         i,
 286                         // Fake xhr
 287                         jXHR = {
 288
 289                                 readyState: 0,
 290
 291                                 // Caches the header
 292                                 setRequestHeader: function(name,value) {
 293                                         if ( state === 0 ) {
 294                                                 requestHeaders[ name.toLowerCase() ] = value;
 295                                         }
 296                                         return this;
 297                                 },
 298
 299                                 // Raw string
 300                                 getAllResponseHeaders: function() {
 301                                         return state === 2 ? responseHeadersString : null;
 302                                 },
 303
 304                                 // Builds headers hashtable if needed
 305                                 // (match is used internally)
 306                                 getResponseHeader: function( key , match ) {
 307
 308                                         if ( state !== 2 ) {
 309                                                 return null;
 310                                         }
 311
 312                                         if ( responseHeaders === undefined ) {
 313
 314                                                 responseHeaders = {};
 315
 316                                                 if ( typeof responseHeadersString === "string" ) {
 317
 318                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 319                                                                 responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
 320                                                         }
 321                                                 }
 322                                         }
 323                                         return responseHeaders[ key.toLowerCase() ];
 324                                 },
 325
 326                                 // Cancel the request
 327                                 abort: function( statusText ) {
 328                                         if ( transport && state !== 2 ) {
 329                                                 transport.abort( statusText || "abort" );
 330                                                 done( 0 , statusText );
 331                                         }
 332                                         return this;
 333                                 }
 334                         };
 335
 336                 // Callback for when everything is done
 337                 // It is defined here because jslint complains if it is declared
 338                 // at the end of the function (which would be more logical and readable)
 339                 function done( status , statusText , response , headers) {
 340
 341                         // Called once
 342                         if ( state === 2 ) {
 343                                 return;
 344                         }
 345
 346                         // State is "done" now
 347                         state = 2;
 348
 349                         // Set readyState
 350                         jXHR.readyState = status ? 4 : 0;
 351
 352                         // Cache response headers
 353                         responseHeadersString = headers || "";
 354
 355                         // Clear timeout if it exists
 356                         if ( timeoutTimer ) {
 357                                 clearTimeout(timeoutTimer);
 358                         }
 359
 360                         var // Reference url
 361                                 url = s.url,
 362                                 // and ifModified status
 363                                 ifModified = s.ifModified,
 364
 365                                 // Is it a success?
 366                                 isSuccess = 0,
 367                                 // Stored success
 368                                 success,
 369                                 // Stored error
 370                                 error;
 371
 372                         // If successful, handle type chaining
 373                         if ( status >= 200 && status < 300 || status === 304 ) {
 374
 375                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 376                                 if ( s.ifModified ) {
 377
 378                                         var lastModified = jXHR.getResponseHeader("Last-Modified"),
 379                                                 etag = jXHR.getResponseHeader("Etag");
 380
 381                                         if (lastModified) {
 382                                                 jQuery_lastModified[ s.url ] = lastModified;
 383                                         }
 384                                         if (etag) {
 385                                                 jQuery_etag[ s.url ] = etag;
 386                                         }
 387                                 }
 388
 389                                 // If not modified
 390                                 if ( status === 304 ) {
 391
 392                                         // Set the statusText accordingly
 393                                         statusText = "notmodified";
 394                                         // Mark as a success
 395                                         isSuccess = 1;
 396
 397                                 // If we have data
 398                                 } else {
 399
 400                                         // Set the statusText accordingly
 401                                         statusText = "success";
 402
 403                                         // Chain data conversions and determine the final value
 404                                         // (if an exception is thrown in the process, it'll be notified as an error)
 405                                         try {
 406
 407                                                 var i,
 408                                                         // Current dataType
 409                                                         current,
 410                                                         // Previous dataType
 411                                                         prev,
 412                                                         // Conversion function
 413                                                         conv,
 414                                                         // Conversion functions (when text is used in-between)
 415                                                         conv1,
 416                                                         conv2,
 417                                                         // Local references to dataTypes & converters
 418                                                         dataTypes = s.dataTypes,
 419                                                         converters = s.converters,
 420                                                         // DataType to responseXXX field mapping
 421                                                         responses = {
 422                                                                 "xml": "XML",
 423                                                                 "text": "Text"
 424                                                         };
 425
 426                                                 // For each dataType in the chain
 427                                                 for( i = 0 ; i < dataTypes.length ; i++ ) {
 428
 429                                                         current = dataTypes[ i ];
 430
 431                                                         // If a responseXXX field for this dataType exists
 432                                                         // and if it hasn't been set yet
 433                                                         if ( responses[ current ] ) {
 434                                                                 // Set it
 435                                                                 jXHR[ "response" + responses[ current ] ] = response;
 436                                                                 // Mark it as set
 437                                                                 responses[ current ] = 0;
 438                                                         }
 439
 440                                                         // If this is not the first element
 441                                                         if ( i ) {
 442
 443                                                                 // Get the dataType to convert from
 444                                                                 prev = dataTypes[ i - 1 ];
 445
 446                                                                 // If no catch-all and dataTypes are actually different
 447                                                                 if ( prev !== "*" && current !== "*" && prev !== current ) {
 448
 449                                                                         // Get the converter
 450                                                                         conv = converters[ prev + " " + current ] ||
 451                                                                                 converters[ "* " + current ];
 452
 453                                                                         conv1 = conv2 = 0;
 454
 455                                                                         // If there is no direct converter and none of the dataTypes is text
 456                                                                         if ( ! conv && prev !== "text" && current !== "text" ) {
 457                                                                                 // Try with text in-between
 458                                                                                 conv1 = converters[ prev + " text" ] || converters[ "* text" ];
 459                                                                                 conv2 = converters[ "text " + current ];
 460                                                                                 // Revert back to a single converter
 461                                                                                 // if one of the converter is an equivalence
 462                                                                                 if ( conv1 === true ) {
 463                                                                                         conv = conv2;
 464                                                                                 } else if ( conv2 === true ) {
 465                                                                                         conv = conv1;
 466                                                                                 }
 467                                                                         }
 468                                                                         // If we found no converter, dispatch an error
 469                                                                         if ( ! ( conv || conv1 && conv2 ) ) {
 470                                                                                 throw conversion;
 471                                                                         }
 472                                                                         // If found converter is not an equivalence
 473                                                                         if ( conv !== true ) {
 474                                                                                 // Convert with 1 or 2 converters accordingly
 475                                                                                 response = conv ? conv( response ) : conv2( conv1( response ) );
 476                                                                         }
 477                                                                 }
 478                                                         // If it is the first element of the chain
 479                                                         // and we have a dataFilter
 480                                                         } else if ( s.dataFilter ) {
 481                                                                 // Apply the dataFilter
 482                                                                 response = s.dataFilter( response , current );
 483                                                                 // Get dataTypes again in case the filter changed them
 484                                                                 dataTypes = s.dataTypes;
 485                                                         }
 486                                                 }
 487                                                 // End of loop
 488
 489                                                 // We have a real success
 490                                                 success = response;
 491                                                 isSuccess = 1;
 492
 493                                         // If an exception was thrown
 494                                         } catch(e) {
 495
 496                                                 // We have a parsererror
 497                                                 statusText = "parsererror";
 498                                                 error = "" + e;
 499
 500                                         }
 501                                 }
 502
 503                         // if not success, mark it as an error
 504                         } else {
 505
 506                                         error = statusText = statusText || "error";
 507
 508                                         // Set responseText if needed
 509                                         if ( response ) {
 510                                                 jXHR.responseText = response;
 511                                         }
 512                         }
 513
 514                         // Set data for the fake xhr object
 515                         jXHR.status = status;
 516                         jXHR.statusText = statusText;
 517
 518                         // Success/Error
 519                         if ( isSuccess ) {
 520                                 deferred.fire( callbackContext , [ success , statusText , jXHR ] );
 521                         } else {
 522                                 deferred.fireReject( callbackContext , [ jXHR , statusText , error ] );
 523                         }
 524
 525                         // Status-dependent callbacks
 526                         jXHR.statusCode( statusCode );
 527
 528                         if ( s.global ) {
 529                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
 530                                                 [ jXHR , s , isSuccess ? success : error ] );
 531                         }
 532
 533                         // Complete
 534                         completeDeferred.fire( callbackContext, [ jXHR , statusText ] );
 535
 536                         if ( s.global ) {
 537                                 globalEventContext.trigger( "ajaxComplete" , [ jXHR , s] );
 538                                 // Handle the global AJAX counter
 539                                 if ( ! --jQuery.active ) {
 540                                         jQuery.event.trigger( "ajaxStop" );
 541                                 }
 542                         }
 543                 }
 544
 545                 // Attach deferreds
 546                 deferred.promise( jXHR );
 547                 jXHR.success = jXHR.done;
 548                 jXHR.error = jXHR.fail;
 549                 jXHR.complete = completeDeferred.done;
 550
 551                 // Status-dependent callbacks
 552                 jXHR.statusCode = function( map ) {
 553                         if ( map ) {
 554                                 var resolved = jXHR.isResolved(),
 555                                         tmp;
 556                                 if ( resolved || jXHR.isRejected() ) {
 557                                         tmp = map[ jXHR.status ];
 558                                         if ( tmp ) {
 559                                                 if ( map === statusCode ) {
 560                                                         delete statusCode[ jXHR.status ];
 561                                                 }
 562                                                 jXHR[ resolved ? "done" : "fail" ]( tmp );
 563                                         }
 564                                 } else {
 565                                         for( tmp in map ) {
 566                                                 statusCode[ tmp ] = [ statusCode[ tmp ] , map[ tmp ] ];
 567                                         }
 568                                 }
 569                         }
 570                         return this;
 571                 };
 572
 573                 // Remove hash character (#7531: and string promotion)
 574                 s.url = ( "" + s.url ).replace( rhash , "" );
 575
 576                 // Uppercase the type
 577                 s.type = s.type.toUpperCase();
 578
 579                 // Determine if request has content
 580                 s.hasContent = ! rnoContent.test( s.type );
 581
 582                 // Extract dataTypes list
 583                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
 584
 585                 // Determine if a cross-domain request is in order
 586                 if ( ! s.crossDomain ) {
 587                         parts = rurl.exec( s.url.toLowerCase() );
 588                         s.crossDomain = !!(
 589                                         parts &&
 590                                         ( parts[ 1 ] && parts[ 1 ] != loc.protocol ||
 591                                                 parts[ 2 ] != loc.hostname ||
 592                                                 ( parts[ 3 ] || 80 ) != ( loc.port || 80 ) )
 593                         );
 594                 }
 595
 596                 // Convert data if not already a string
 597                 if ( s.data && s.processData && typeof s.data != "string" ) {
 598                         s.data = jQuery.param( s.data , s.traditional );
 599                 }
 600
 601                 // Get transport
 602                 transport = jQuery.ajax.prefilter( s , options ).transport( s );
 603
 604                 // Watch for a new set of requests
 605                 if ( s.global && jQuery.active++ === 0 ) {
 606                         jQuery.event.trigger( "ajaxStart" );
 607                 }
 608
 609                 // If no transport, we auto-abort
 610                 if ( ! transport ) {
 611
 612                         done( 0 , "transport not found" );
 613                         jXHR = false;
 614
 615                 } else {
 616
 617                         // More options handling for requests with no content
 618                         if ( ! s.hasContent ) {
 619
 620                                 // If data is available, append data to url
 621                                 if ( s.data ) {
 622                                         s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 623                                 }
 624
 625                                 // Add anti-cache in url if needed
 626                                 if ( s.cache === false ) {
 627
 628                                         var ts = jQuery.now(),
 629                                                 // try replacing _= if it is there
 630                                                 ret = s.url.replace( rts , "$1_=" + ts );
 631
 632                                         // if nothing was replaced, add timestamp to the end
 633                                         s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
 634                                 }
 635                         }
 636
 637                         // Set the correct header, if data is being sent
 638                         if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 639                                 requestHeaders[ "content-type" ] = s.contentType;
 640                         }
 641
 642                         // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 643                         if ( s.ifModified ) {
 644                                 if ( jQuery_lastModified[ s.url ] ) {
 645                                         requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
 646                                 }
 647                                 if ( jQuery_etag[ s.url ] ) {
 648                                         requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
 649                                 }
 650                         }
 651
 652                         // Set the Accepts header for the server, depending on the dataType
 653                         requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
 654                                 s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 655                                 s.accepts[ "*" ];
 656
 657                         // Check for headers option
 658                         for ( i in s.headers ) {
 659                                 requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
 660                         }
 661
 662                         // Allow custom headers/mimetypes and early abort
 663                         if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
 664
 665                                         // Abort if not done already
 666                                         done( 0 , "abort" );
 667                                         jXHR = false;
 668
 669                         } else {
 670
 671                                 // Set state as sending
 672                                 state = 1;
 673                                 jXHR.readyState = 1;
 674
 675                                 // Install callbacks on deferreds
 676                                 for ( i in { success:1, error:1, complete:1 } ) {
 677                                         jXHR[ i ]( s[ i ] );
 678                                 }
 679
 680                                 // Send global event
 681                                 if ( s.global ) {
 682                                         globalEventContext.trigger( "ajaxSend" , [ jXHR , s ] );
 683                                 }
 684
 685                                 // Timeout
 686                                 if ( s.async && s.timeout > 0 ) {
 687                                         timeoutTimer = setTimeout(function(){
 688                                                 jXHR.abort( "timeout" );
 689                                         }, s.timeout);
 690                                 }
 691
 692                                 // Try to send
 693                                 try {
 694                                         transport.send(requestHeaders, done);
 695                                 } catch (e) {
 696                                         // Propagate exception as error if not done
 697                                         if ( status === 1 ) {
 698
 699                                                 done(0, "error", "" + e);
 700                                                 jXHR = false;
 701
 702                                         // Simply rethrow otherwise
 703                                         } else {
 704                                                 jQuery.error(e);
 705                                         }
 706                                 }
 707                         }
 708                 }
 709
 710                 return jXHR;
 711         },
 712
 713         // Serialize an array of form elements or a set of
 714         // key/values into a query string
 715         param: function( a, traditional ) {
 716                 var s = [],
 717                         add = function( key, value ) {
 718                                 // If value is a function, invoke it and return its value
 719                                 value = jQuery.isFunction(value) ? value() : value;
 720                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 721                         };
 722
 723                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 724                 if ( traditional === undefined ) {
 725                         traditional = jQuery.ajaxSettings.traditional;
 726                 }
 727
 728                 // If an array was passed in, assume that it is an array of form elements.
 729                 if ( jQuery.isArray(a) || a.jquery ) {
 730                         // Serialize the form elements
 731                         jQuery.each( a, function() {
 732                                 add( this.name, this.value );
 733                         });
 734
 735                 } else {
 736                         // If traditional, encode the "old" way (the way 1.3.2 or older
 737                         // did it), otherwise encode params recursively.
 738                         for ( var prefix in a ) {
 739                                 buildParams( prefix, a[prefix], traditional, add );
 740                         }
 741                 }
 742
 743                 // Return the resulting serialization
 744                 return s.join("&").replace(r20, "+");
 745         }
 746 });
 747
 748 function buildParams( prefix, obj, traditional, add ) {
 749         if ( jQuery.isArray(obj) && obj.length ) {
 750                 // Serialize array item.
 751                 jQuery.each( obj, function( i, v ) {
 752                         if ( traditional || rbracket.test( prefix ) ) {
 753                                 // Treat each array item as a scalar.
 754                                 add( prefix, v );
 755
 756                         } else {
 757                                 // If array item is non-scalar (array or object), encode its
 758                                 // numeric index to resolve deserialization ambiguity issues.
 759                                 // Note that rack (as of 1.0.0) can't currently deserialize
 760                                 // nested arrays properly, and attempting to do so may cause
 761                                 // a server error. Possible fixes are to modify rack's
 762                                 // deserialization algorithm or to provide an option or flag
 763                                 // to force array serialization to be shallow.
 764                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 765                         }
 766                 });
 767
 768         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 769                 // If we see an array here, it is empty and should be treated as an empty
 770                 // object
 771                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 772                         add( prefix, "" );
 773
 774                 // Serialize object item.
 775                 } else {
 776                         jQuery.each( obj, function( k, v ) {
 777                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 778                         });
 779                 }
 780
 781         } else {
 782                 // Serialize scalar item.
 783                 add( prefix, obj );
 784         }
 785 }
 786
 787 // This is still on the jQuery object... for now
 788 // Want to move this to jQuery.ajax some day
 789 jQuery.extend({
 790
 791         // Counter for holding the number of active queries
 792         active: 0,
 793
 794         // Last-Modified header cache for next request
 795         lastModified: {},
 796         etag: {}
 797
 798 });
 799
 800 //Execute or select from functions in a given structure of options
 801 function ajax_selectOrExecute( structure , s ) {
 802
 803         var dataTypes = s.dataTypes,
 804                 transportDataType,
 805                 list,
 806                 selected,
 807                 i,
 808                 length,
 809                 checked = {},
 810                 flag,
 811                 noSelect = structure !== "transports";
 812
 813         function initSearch( dataType ) {
 814
 815                 flag = transportDataType !== dataType && ! checked[ dataType ];
 816
 817                 if ( flag ) {
 818
 819                         checked[ dataType ] = 1;
 820                         transportDataType = dataType;
 821                         list = s[ structure ][ dataType ];
 822                         i = -1;
 823                         length = list ? list.length : 0 ;
 824                 }
 825
 826                 return flag;
 827         }
 828
 829         initSearch( dataTypes[ 0 ] );
 830
 831         for ( i = 0 ; ( noSelect || ! selected ) && i <= length ; i++ ) {
 832
 833                 if ( i === length ) {
 834
 835                         initSearch( "*" );
 836
 837                 } else {
 838
 839                         selected = list[ i ]( s , determineDataType );
 840
 841                         // If we got redirected to another dataType
 842                         // Search there (if not in progress or already tried)
 843                         if ( typeof( selected ) === "string" &&
 844                                 initSearch( selected ) ) {
 845
 846                                 dataTypes.unshift( selected );
 847                                 selected = 0;
 848                         }
 849                 }
 850         }
 851
 852         return noSelect ? jQuery.ajax : selected;
 853 }
 854
 855 // Add an element to one of the structures in ajaxSettings
 856 function ajax_addElement( structure , args ) {
 857
 858         var i,
 859                 start = 0,
 860                 length = args.length,
 861                 dataTypes = [ "*" ],
 862                 dLength = 1,
 863                 dataType,
 864                 functors = [],
 865                 first,
 866                 append,
 867                 list;
 868
 869         if ( length ) {
 870
 871                 first = jQuery.type( args[ 0 ] );
 872
 873                 if ( first === "object" ) {
 874                         return ajax_selectOrExecute( structure , args[ 0 ] );
 875                 }
 876
 877                 structure = jQuery.ajaxSettings[ structure ];
 878
 879                 if ( first !== "function" ) {
 880
 881                         dataTypes = args[ 0 ].toLowerCase().split(/\s+/);
 882                         dLength = dataTypes.length;
 883                         start = 1;
 884
 885                 }
 886
 887                 if ( dLength && start < length ) {
 888
 889                         functors = sliceFunc.call( args , start );
 890
 891                         for( i = 0 ; i < dLength ; i++ ) {
 892
 893                                 dataType = dataTypes[ i ];
 894
 895                                 first = /^\+/.test( dataType );
 896
 897                                 if (first) {
 898                                         dataType = dataType.substr(1);
 899                                 }
 900
 901                                 if ( dataType !== "" ) {
 902
 903                                         append = Array.prototype[ first ? "unshift" : "push" ];
 904                                         list = structure[ dataType ] = structure[ dataType ] || [];
 905                                         append.apply( list , functors );
 906                                 }
 907                         }
 908                 }
 909         }
 910
 911         return jQuery.ajax;
 912 }
 913
 914 // Install prefilter & transport methods
 915 jQuery.each( [ "prefilter" , "transport" ] , function( _ , name ) {
 916         _ = name + "s";
 917         jQuery.ajax[ name ] = function() {
 918                 return ajax_addElement( _ , arguments );
 919         };
 920 } );
 921
 922 // Utility function that handles dataType when response is received
 923 // (for those transports that can give text or xml responses)
 924 function determineDataType( s , ct , text , xml ) {
 925
 926         var contents = s.contents,
 927                 type,
 928                 regexp,
 929                 dataTypes = s.dataTypes,
 930                 transportDataType = dataTypes[0],
 931                 response;
 932
 933         // Auto (xml, json, script or text determined given headers)
 934         if ( transportDataType === "*" ) {
 935
 936                 for ( type in contents ) {
 937                         if ( ( regexp = contents[ type ] ) && regexp.test( ct ) ) {
 938                                 transportDataType = dataTypes[0] = type;
 939                                 break;
 940                         }
 941                 }
 942         }
 943
 944         // xml and parsed as such
 945         if ( transportDataType === "xml" &&
 946                 xml &&
 947                 xml.documentElement /* #4958 */ ) {
 948
 949                 response = xml;
 950
 951         // Text response was provided
 952         } else {
 953
 954                 response = text;
 955
 956                 // If it's not really text, defer to converters
 957                 if ( transportDataType !== "text" ) {
 958                         dataTypes.unshift( "text" );
 959                 }
 960
 961         }
 962
 963         return response;
 964 }
 965
 966 /*
 967  * Create the request object; Microsoft failed to properly
 968  * implement the XMLHttpRequest in IE7 (can't request local files),
 969  * so we use the ActiveXObject when it is available
 970  * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
 971  * we need a fallback.
 972  */
 973 if ( window.ActiveXObject ) {
 974         jQuery.ajaxSettings.xhr = function() {
 975         if ( window.location.protocol !== "file:" ) {
 976                 try {
 977                         return new window.XMLHttpRequest();
 978                 } catch( xhrError ) {}
 979         }
 980
 981         try {
 982                 return new window.ActiveXObject("Microsoft.XMLHTTP");
 983         } catch( activeError ) {}
 984         };
 985 }
 986
 987 var testXHR = jQuery.ajaxSettings.xhr();
 988
 989 // Does this browser support XHR requests?
 990 jQuery.support.ajax = !!testXHR;
 991
 992 // Does this browser support crossDomain XHR requests
 993 jQuery.support.cors = testXHR && "withCredentials" in testXHR;
 994
 995 })( jQuery );