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