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                 return this;
 165         },
 166
 167         ajaxSettings: {
 168                 url: location.href,
 169                 global: true,
 170                 type: "GET",
 171                 contentType: "application/x-www-form-urlencoded",
 172                 processData: true,
 173                 async: true,
 174                 /*
 175                 timeout: 0,
 176                 data: null,
 177                 dataType: null,
 178                 username: null,
 179                 password: null,
 180                 cache: null,
 181                 traditional: false,
 182                 headers: {},
 183                 crossDomain: null,
 184                 */
 185                 xhr: function() {
 186                         return new window.XMLHttpRequest();
 187                 },
 188
 189                 accepts: {
 190                         xml: "application/xml, text/xml",
 191                         html: "text/html",
 192                         text: "text/plain",
 193                         json: "application/json, text/javascript",
 194                         "*": "*/*"
 195                 },
 196
 197                 contents: {
 198                         xml: /xml/,
 199                         html: /html/,
 200                         json: /json/
 201                 },
 202
 203                 // Prefilters
 204                 // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
 205                 // 2) These are called:
 206                 //    * BEFORE asking for a transport
 207                 //    * AFTER param serialization (s.data is a string if s.processData is true)
 208                 // 3) key is the dataType
 209                 // 4) the catchall symbol "*" can be used
 210                 // 5) execution will start with transport dataType and THEN continue down to "*" if needed
 211                 prefilters: {},
 212
 213                 // Transports bindings
 214                 // 1) key is the dataType
 215                 // 2) the catchall symbol "*" can be used
 216                 // 3) selection will start with transport dataType and THEN go to "*" if needed
 217                 transports: {},
 218
 219                 // List of data converters
 220                 // 1) key format is "source_type destination_type" (a single space in-between)
 221                 // 2) the catchall symbol "*" can be used for source_type
 222                 converters: {
 223
 224                         // Convert anything to text
 225                         "* text": window.String,
 226
 227                         // Text to html (true = no transformation)
 228                         "text html": true,
 229
 230                         // Evaluate text as a json expression
 231                         "text json": jQuery.parseJSON,
 232
 233                         // Parse text as xml
 234                         "text xml": jQuery.parseXML
 235                 }
 236         },
 237
 238         // Main method
 239         // (s is used internally)
 240         ajax: function( url , options , s ) {
 241
 242                 // Handle varargs
 243                 if ( arguments.length === 1 ) {
 244                         options = url;
 245                         url = options ? options.url : undefined;
 246                 }
 247
 248                 // Force options to be an object
 249                 options = options || {};
 250
 251                 // Get the url if provided separately
 252                 options.url = url || options.url;
 253
 254                 // Create the final options object
 255                 s = jQuery.extend( true , {} , jQuery.ajaxSettings , options );
 256
 257                 // We force the original context
 258                 // (plain objects used as context get extended)
 259                 s.context = options.context;
 260
 261                 var // jQuery lists
 262                         jQuery_lastModified = jQuery.lastModified,
 263                         jQuery_etag = jQuery.etag,
 264                         // Callbacks contexts
 265                         callbackContext = s.context || s,
 266                         globalEventContext = s.context ? jQuery( s.context ) : jQuery.event,
 267                         // Deferreds
 268                         deferred = jQuery.Deferred(),
 269                         completeDeferred = jQuery._Deferred(),
 270                         // Status-dependent callbacks
 271                         statusCode = s.statusCode || {},
 272                         // Headers (they are sent all at once)
 273                         requestHeaders = {},
 274                         // Response headers
 275                         responseHeadersString,
 276                         responseHeaders,
 277                         // transport
 278                         transport,
 279                         // timeout handle
 280                         timeoutTimer,
 281                         // Cross-domain detection vars
 282                         loc = document.location,
 283                         parts,
 284                         // The jXHR state
 285                         state = 0,
 286                         // Loop variable
 287                         i,
 288                         // Fake xhr
 289                         jXHR = {
 290
 291                                 readyState: 0,
 292
 293                                 // Caches the header
 294                                 setRequestHeader: function(name,value) {
 295                                         if ( state === 0 ) {
 296                                                 requestHeaders[ name.toLowerCase() ] = value;
 297                                         }
 298                                         return this;
 299                                 },
 300
 301                                 // Raw string
 302                                 getAllResponseHeaders: function() {
 303                                         return state === 2 ? responseHeadersString : null;
 304                                 },
 305
 306                                 // Builds headers hashtable if needed
 307                                 // (match is used internally)
 308                                 getResponseHeader: function( key , match ) {
 309
 310                                         if ( state === 2 ) {
 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                                                 match = responseHeaders[ key.toLowerCase() ];
 324
 325                                         } else {
 326
 327                                                 match = null;
 328                                         }
 329
 330                                         return match;
 331                                 },
 332
 333                                 // Cancel the request
 334                                 abort: function( statusText ) {
 335                                         if ( transport ) {
 336                                                 transport.abort( statusText || "abort" );
 337                                         }
 338                                         done( 0 , statusText );
 339                                         return this;
 340                                 }
 341                         };
 342
 343                 // Callback for when everything is done
 344                 // It is defined here because jslint complains if it is declared
 345                 // at the end of the function (which would be more logical and readable)
 346                 function done( status , statusText , response , headers) {
 347
 348                         // Called once
 349                         if ( state === 2 ) {
 350                                 return;
 351                         }
 352
 353                         // State is "done" now
 354                         state = 2;
 355
 356                         // Dereference transport for early garbage collection
 357                         // (no matter how long the jXHR transport will be used
 358                         transport = 0;
 359
 360                         // Set readyState
 361                         jXHR.readyState = status ? 4 : 0;
 362
 363                         // Cache response headers
 364                         responseHeadersString = headers || "";
 365
 366                         // Clear timeout if it exists
 367                         if ( timeoutTimer ) {
 368                                 clearTimeout(timeoutTimer);
 369                         }
 370
 371                         var // Reference url
 372                                 url = s.url,
 373                                 // and ifModified status
 374                                 ifModified = s.ifModified,
 375
 376                                 // Is it a success?
 377                                 isSuccess = 0,
 378                                 // Stored success
 379                                 success,
 380                                 // Stored error
 381                                 error;
 382
 383                         // If successful, handle type chaining
 384                         if ( status >= 200 && status < 300 || status === 304 ) {
 385
 386                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 387                                 if ( s.ifModified ) {
 388
 389                                         var lastModified = jXHR.getResponseHeader("Last-Modified"),
 390                                                 etag = jXHR.getResponseHeader("Etag");
 391
 392                                         if (lastModified) {
 393                                                 jQuery_lastModified[ s.url ] = lastModified;
 394                                         }
 395                                         if (etag) {
 396                                                 jQuery_etag[ s.url ] = etag;
 397                                         }
 398                                 }
 399
 400                                 // If not modified
 401                                 if ( status === 304 ) {
 402
 403                                         // Set the statusText accordingly
 404                                         statusText = "notmodified";
 405                                         // Mark as a success
 406                                         isSuccess = 1;
 407
 408                                 // If we have data
 409                                 } else {
 410
 411                                         // Set the statusText accordingly
 412                                         statusText = "success";
 413
 414                                         // Chain data conversions and determine the final value
 415                                         // (if an exception is thrown in the process, it'll be notified as an error)
 416                                         try {
 417
 418                                                 var i,
 419                                                         // Current dataType
 420                                                         current,
 421                                                         // Previous dataType
 422                                                         prev,
 423                                                         // Conversion function
 424                                                         conv,
 425                                                         // Conversion functions (when text is used in-between)
 426                                                         conv1,
 427                                                         conv2,
 428                                                         // Local references to dataTypes & converters
 429                                                         dataTypes = s.dataTypes,
 430                                                         converters = s.converters,
 431                                                         // DataType to responseXXX field mapping
 432                                                         responses = {
 433                                                                 "xml": "XML",
 434                                                                 "text": "Text"
 435                                                         };
 436
 437                                                 // For each dataType in the chain
 438                                                 for( i = 0 ; i < dataTypes.length ; i++ ) {
 439
 440                                                         current = dataTypes[ i ];
 441
 442                                                         // If a responseXXX field for this dataType exists
 443                                                         // and if it hasn't been set yet
 444                                                         if ( responses[ current ] ) {
 445                                                                 // Set it
 446                                                                 jXHR[ "response" + responses[ current ] ] = response;
 447                                                                 // Mark it as set
 448                                                                 responses[ current ] = 0;
 449                                                         }
 450
 451                                                         // If this is not the first element
 452                                                         if ( i ) {
 453
 454                                                                 // Get the dataType to convert from
 455                                                                 prev = dataTypes[ i - 1 ];
 456
 457                                                                 // If no catch-all and dataTypes are actually different
 458                                                                 if ( prev !== "*" && current !== "*" && prev !== current ) {
 459
 460                                                                         // Get the converter
 461                                                                         conv = converters[ prev + " " + current ] ||
 462                                                                                 converters[ "* " + current ];
 463
 464                                                                         conv1 = conv2 = 0;
 465
 466                                                                         // If there is no direct converter and none of the dataTypes is text
 467                                                                         if ( ! conv && prev !== "text" && current !== "text" ) {
 468                                                                                 // Try with text in-between
 469                                                                                 conv1 = converters[ prev + " text" ] || converters[ "* text" ];
 470                                                                                 conv2 = converters[ "text " + current ];
 471                                                                                 // Revert back to a single converter
 472                                                                                 // if one of the converter is an equivalence
 473                                                                                 if ( conv1 === true ) {
 474                                                                                         conv = conv2;
 475                                                                                 } else if ( conv2 === true ) {
 476                                                                                         conv = conv1;
 477                                                                                 }
 478                                                                         }
 479                                                                         // If we found no converter, dispatch an error
 480                                                                         if ( ! ( conv || conv1 && conv2 ) ) {
 481                                                                                 throw conversion;
 482                                                                         }
 483                                                                         // If found converter is not an equivalence
 484                                                                         if ( conv !== true ) {
 485                                                                                 // Convert with 1 or 2 converters accordingly
 486                                                                                 response = conv ? conv( response ) : conv2( conv1( response ) );
 487                                                                         }
 488                                                                 }
 489                                                         // If it is the first element of the chain
 490                                                         // and we have a dataFilter
 491                                                         } else if ( s.dataFilter ) {
 492                                                                 // Apply the dataFilter
 493                                                                 response = s.dataFilter( response , current );
 494                                                                 // Get dataTypes again in case the filter changed them
 495                                                                 dataTypes = s.dataTypes;
 496                                                         }
 497                                                 }
 498                                                 // End of loop
 499
 500                                                 // We have a real success
 501                                                 success = response;
 502                                                 isSuccess = 1;
 503
 504                                         // If an exception was thrown
 505                                         } catch(e) {
 506
 507                                                 // We have a parsererror
 508                                                 statusText = "parsererror";
 509                                                 error = "" + e;
 510
 511                                         }
 512                                 }
 513
 514                         // if not success, mark it as an error
 515                         } else {
 516
 517                                         error = statusText = statusText || "error";
 518
 519                                         // Set responseText if needed
 520                                         if ( response ) {
 521                                                 jXHR.responseText = response;
 522                                         }
 523                         }
 524
 525                         // Set data for the fake xhr object
 526                         jXHR.status = status;
 527                         jXHR.statusText = statusText;
 528
 529                         // Success/Error
 530                         if ( isSuccess ) {
 531                                 deferred.fire( callbackContext , [ success , statusText , jXHR ] );
 532                         } else {
 533                                 deferred.fireReject( callbackContext , [ jXHR , statusText , error ] );
 534                         }
 535
 536                         // Status-dependent callbacks
 537                         jXHR.statusCode( statusCode );
 538
 539                         if ( s.global ) {
 540                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
 541                                                 [ jXHR , s , isSuccess ? success : error ] );
 542                         }
 543
 544                         // Complete
 545                         completeDeferred.fire( callbackContext, [ jXHR , statusText ] );
 546
 547                         if ( s.global ) {
 548                                 globalEventContext.trigger( "ajaxComplete" , [ jXHR , s] );
 549                                 // Handle the global AJAX counter
 550                                 if ( ! --jQuery.active ) {
 551                                         jQuery.event.trigger( "ajaxStop" );
 552                                 }
 553                         }
 554                 }
 555
 556                 // Attach deferreds
 557                 deferred.promise( jXHR );
 558                 jXHR.success = jXHR.done;
 559                 jXHR.error = jXHR.fail;
 560                 jXHR.complete = completeDeferred.done;
 561
 562                 // Status-dependent callbacks
 563                 jXHR.statusCode = function( map ) {
 564                         if ( map ) {
 565                                 var resolved = jXHR.isResolved(),
 566                                         tmp;
 567                                 if ( resolved || jXHR.isRejected() ) {
 568                                         tmp = map[ jXHR.status ];
 569                                         if ( tmp ) {
 570                                                 if ( map === statusCode ) {
 571                                                         delete statusCode[ jXHR.status ];
 572                                                 }
 573                                                 jXHR[ resolved ? "done" : "fail" ]( tmp );
 574                                         }
 575                                 } else {
 576                                         for( tmp in map ) {
 577                                                 statusCode[ tmp ] = [ statusCode[ tmp ] , map[ tmp ] ];
 578                                         }
 579                                 }
 580                         }
 581                         return this;
 582                 };
 583
 584                 // Remove hash character (#7531: and string promotion)
 585                 s.url = ( "" + s.url ).replace( rhash , "" );
 586
 587                 // Uppercase the type
 588                 s.type = s.type.toUpperCase();
 589
 590                 // Determine if request has content
 591                 s.hasContent = ! rnoContent.test( s.type );
 592
 593                 // Extract dataTypes list
 594                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
 595
 596                 // Determine if a cross-domain request is in order
 597                 if ( ! s.crossDomain ) {
 598                         parts = rurl.exec( s.url.toLowerCase() );
 599                         s.crossDomain = !!(
 600                                         parts &&
 601                                         ( parts[ 1 ] && parts[ 1 ] != loc.protocol ||
 602                                                 parts[ 2 ] != loc.hostname ||
 603                                                 ( parts[ 3 ] || 80 ) != ( loc.port || 80 ) )
 604                         );
 605                 }
 606
 607                 // Convert data if not already a string
 608                 if ( s.data && s.processData && typeof s.data != "string" ) {
 609                         s.data = jQuery.param( s.data , s.traditional );
 610                 }
 611
 612                 // Apply prefilters
 613                 jQuery.ajaxPrefilter( s , options );
 614
 615                 // Watch for a new set of requests
 616                 if ( s.global && jQuery.active++ === 0 ) {
 617                         jQuery.event.trigger( "ajaxStart" );
 618                 }
 619
 620                 // More options handling for requests with no content
 621                 if ( ! s.hasContent ) {
 622
 623                         // If data is available, append data to url
 624                         if ( s.data ) {
 625                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 626                         }
 627
 628                         // Add anti-cache in url if needed
 629                         if ( s.cache === false ) {
 630
 631                                 var ts = jQuery.now(),
 632                                         // try replacing _= if it is there
 633                                         ret = s.url.replace( rts , "$1_=" + ts );
 634
 635                                 // if nothing was replaced, add timestamp to the end
 636                                 s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
 637                         }
 638                 }
 639
 640                 // Set the correct header, if data is being sent
 641                 if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 642                         requestHeaders[ "content-type" ] = s.contentType;
 643                 }
 644
 645                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 646                 if ( s.ifModified ) {
 647                         if ( jQuery_lastModified[ s.url ] ) {
 648                                 requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
 649                         }
 650                         if ( jQuery_etag[ s.url ] ) {
 651                                 requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
 652                         }
 653                 }
 654
 655                 // Set the Accepts header for the server, depending on the dataType
 656                 requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
 657                         s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 658                         s.accepts[ "*" ];
 659
 660                 // Check for headers option
 661                 for ( i in s.headers ) {
 662                         requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
 663                 }
 664
 665                 // Allow custom headers/mimetypes and early abort
 666                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
 667
 668                                 // Abort if not done already
 669                                 done( 0 , "abort" );
 670
 671                                 // Return false
 672                                 jXHR = false;
 673
 674                 } else {
 675
 676                         // Install callbacks on deferreds
 677                         for ( i in { success:1, error:1, complete:1 } ) {
 678                                 jXHR[ i ]( s[ i ] );
 679                         }
 680
 681                         // Get transport
 682                         transport = jQuery.ajaxTransport( s );
 683
 684                         // If no transport, we auto-abort
 685                         if ( ! transport ) {
 686
 687                                 done( 0 , "notransport" );
 688
 689                         } else {
 690
 691                                 // Set state as sending
 692                                 state = jXHR.readyState = 1;
 693
 694                                 // Send global event
 695                                 if ( s.global ) {
 696                                         globalEventContext.trigger( "ajaxSend" , [ jXHR , s ] );
 697                                 }
 698
 699                                 // Timeout
 700                                 if ( s.async && s.timeout > 0 ) {
 701                                         timeoutTimer = setTimeout(function(){
 702                                                 jXHR.abort( "timeout" );
 703                                         }, s.timeout);
 704                                 }
 705
 706                                 // Try to send
 707                                 try {
 708                                         transport.send(requestHeaders, done);
 709                                 } catch (e) {
 710                                         // Propagate exception as error if not done
 711                                         if ( status === 1 ) {
 712
 713                                                 done(0, "error", "" + e);
 714                                                 jXHR = false;
 715
 716                                         // Simply rethrow otherwise
 717                                         } else {
 718                                                 jQuery.error(e);
 719                                         }
 720                                 }
 721                         }
 722                 }
 723
 724                 return jXHR;
 725         },
 726
 727         // Serialize an array of form elements or a set of
 728         // key/values into a query string
 729         param: function( a, traditional ) {
 730                 var s = [],
 731                         add = function( key, value ) {
 732                                 // If value is a function, invoke it and return its value
 733                                 value = jQuery.isFunction(value) ? value() : value;
 734                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 735                         };
 736
 737                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 738                 if ( traditional === undefined ) {
 739                         traditional = jQuery.ajaxSettings.traditional;
 740                 }
 741
 742                 // If an array was passed in, assume that it is an array of form elements.
 743                 if ( jQuery.isArray(a) || a.jquery ) {
 744                         // Serialize the form elements
 745                         jQuery.each( a, function() {
 746                                 add( this.name, this.value );
 747                         });
 748
 749                 } else {
 750                         // If traditional, encode the "old" way (the way 1.3.2 or older
 751                         // did it), otherwise encode params recursively.
 752                         for ( var prefix in a ) {
 753                                 buildParams( prefix, a[prefix], traditional, add );
 754                         }
 755                 }
 756
 757                 // Return the resulting serialization
 758                 return s.join("&").replace(r20, "+");
 759         }
 760 });
 761
 762 function buildParams( prefix, obj, traditional, add ) {
 763         if ( jQuery.isArray(obj) && obj.length ) {
 764                 // Serialize array item.
 765                 jQuery.each( obj, function( i, v ) {
 766                         if ( traditional || rbracket.test( prefix ) ) {
 767                                 // Treat each array item as a scalar.
 768                                 add( prefix, v );
 769
 770                         } else {
 771                                 // If array item is non-scalar (array or object), encode its
 772                                 // numeric index to resolve deserialization ambiguity issues.
 773                                 // Note that rack (as of 1.0.0) can't currently deserialize
 774                                 // nested arrays properly, and attempting to do so may cause
 775                                 // a server error. Possible fixes are to modify rack's
 776                                 // deserialization algorithm or to provide an option or flag
 777                                 // to force array serialization to be shallow.
 778                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 779                         }
 780                 });
 781
 782         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 783                 // If we see an array here, it is empty and should be treated as an empty
 784                 // object
 785                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 786                         add( prefix, "" );
 787
 788                 // Serialize object item.
 789                 } else {
 790                         jQuery.each( obj, function( k, v ) {
 791                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 792                         });
 793                 }
 794
 795         } else {
 796                 // Serialize scalar item.
 797                 add( prefix, obj );
 798         }
 799 }
 800
 801 // This is still on the jQuery object... for now
 802 // Want to move this to jQuery.ajax some day
 803 jQuery.extend({
 804
 805         // Counter for holding the number of active queries
 806         active: 0,
 807
 808         // Last-Modified header cache for next request
 809         lastModified: {},
 810         etag: {}
 811
 812 });
 813
 814 //Execute or select from functions in a given structure of options
 815 function ajax_selectOrExecute( structure , s ) {
 816
 817         var dataTypes = s.dataTypes,
 818                 transportDataType,
 819                 list,
 820                 selected,
 821                 i,
 822                 length,
 823                 checked = {},
 824                 flag,
 825                 noSelect = structure !== "transports";
 826
 827         function initSearch( dataType ) {
 828
 829                 flag = transportDataType !== dataType && ! checked[ dataType ];
 830
 831                 if ( flag ) {
 832
 833                         checked[ dataType ] = 1;
 834                         transportDataType = dataType;
 835                         list = s[ structure ][ dataType ];
 836                         i = -1;
 837                         length = list ? list.length : 0 ;
 838                 }
 839
 840                 return flag;
 841         }
 842
 843         initSearch( dataTypes[ 0 ] );
 844
 845         for ( i = 0 ; ( noSelect || ! selected ) && i <= length ; i++ ) {
 846
 847                 if ( i === length ) {
 848
 849                         initSearch( "*" );
 850
 851                 } else {
 852
 853                         selected = list[ i ]( s , determineDataType );
 854
 855                         // If we got redirected to another dataType
 856                         // Search there (if not in progress or already tried)
 857                         if ( typeof( selected ) === "string" &&
 858                                 initSearch( selected ) ) {
 859
 860                                 dataTypes.unshift( selected );
 861                                 selected = 0;
 862                         }
 863                 }
 864         }
 865
 866         return noSelect ? jQuery : selected;
 867 }
 868
 869 // Add an element to one of the structures in ajaxSettings
 870 function ajax_addElement( structure , args ) {
 871
 872         var i,
 873                 start = 0,
 874                 length = args.length,
 875                 dataTypes = [ "*" ],
 876                 dLength = 1,
 877                 dataType,
 878                 functors = [],
 879                 first,
 880                 append,
 881                 list;
 882
 883         if ( length ) {
 884
 885                 first = jQuery.type( args[ 0 ] );
 886
 887                 if ( first === "object" ) {
 888                         return ajax_selectOrExecute( structure , args[ 0 ] );
 889                 }
 890
 891                 structure = jQuery.ajaxSettings[ structure ];
 892
 893                 if ( first !== "function" ) {
 894
 895                         dataTypes = args[ 0 ].toLowerCase().split(/\s+/);
 896                         dLength = dataTypes.length;
 897                         start = 1;
 898
 899                 }
 900
 901                 if ( dLength && start < length ) {
 902
 903                         functors = sliceFunc.call( args , start );
 904
 905                         for( i = 0 ; i < dLength ; i++ ) {
 906
 907                                 dataType = dataTypes[ i ];
 908
 909                                 first = /^\+/.test( dataType );
 910
 911                                 if (first) {
 912                                         dataType = dataType.substr(1);
 913                                 }
 914
 915                                 if ( dataType !== "" ) {
 916
 917                                         append = Array.prototype[ first ? "unshift" : "push" ];
 918                                         list = structure[ dataType ] = structure[ dataType ] || [];
 919                                         append.apply( list , functors );
 920                                 }
 921                         }
 922                 }
 923         }
 924
 925         return jQuery;
 926 }
 927
 928 // Install prefilter & transport methods
 929 jQuery.each( [ "Prefilter" , "Transport" ] , function( _ , name ) {
 930         _ = name.toLowerCase() + "s";
 931         jQuery[ "ajax" + name ] = function() {
 932                 return ajax_addElement( _ , arguments );
 933         };
 934 } );
 935
 936 // Utility function that handles dataType when response is received
 937 // (for those transports that can give text or xml responses)
 938 function determineDataType( s , ct , text , xml ) {
 939
 940         var contents = s.contents,
 941                 type,
 942                 regexp,
 943                 dataTypes = s.dataTypes,
 944                 transportDataType = dataTypes[0],
 945                 response;
 946
 947         // Auto (xml, json, script or text determined given headers)
 948         if ( transportDataType === "*" ) {
 949
 950                 for ( type in contents ) {
 951                         if ( ( regexp = contents[ type ] ) && regexp.test( ct ) ) {
 952                                 transportDataType = dataTypes[0] = type;
 953                                 break;
 954                         }
 955                 }
 956         }
 957
 958         // xml and parsed as such
 959         if ( transportDataType === "xml" &&
 960                 xml &&
 961                 xml.documentElement /* #4958 */ ) {
 962
 963                 response = xml;
 964
 965         // Text response was provided
 966         } else {
 967
 968                 response = text;
 969
 970                 // If it's not really text, defer to converters
 971                 if ( transportDataType !== "text" ) {
 972                         dataTypes.unshift( "text" );
 973                 }
 974
 975         }
 976
 977         return response;
 978 }
 979
 980 /*
 981  * Create the request object; Microsoft failed to properly
 982  * implement the XMLHttpRequest in IE7 (can't request local files),
 983  * so we use the ActiveXObject when it is available
 984  * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
 985  * we need a fallback.
 986  */
 987 if ( window.ActiveXObject ) {
 988         jQuery.ajaxSettings.xhr = function() {
 989         if ( window.location.protocol !== "file:" ) {
 990                 try {
 991                         return new window.XMLHttpRequest();
 992                 } catch( xhrError ) {}
 993         }
 994
 995         try {
 996                 return new window.ActiveXObject("Microsoft.XMLHTTP");
 997         } catch( activeError ) {}
 998         };
 999 }
1000
1001 var testXHR = jQuery.ajaxSettings.xhr();
1002
1003 // Does this browser support XHR requests?
1004 jQuery.support.ajax = !!testXHR;
1005
1006 // Does this browser support crossDomain XHR requests
1007 jQuery.support.cors = testXHR && "withCredentials" in testXHR;
1008
1009 })( jQuery );