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: function( res, status ) {
  65                                 // If successful, inject the HTML into all the matched elements
  66                                 if ( status === "success" || status === "notmodified" ) {
  67                                         // See if a selector was specified
  68                                         self.html( selector ?
  69                                                 // Create a dummy div to hold the results
  70                                                 jQuery("<div>")
  71                                                         // inject the contents of the document in, removing the scripts
  72                                                         // to avoid any 'Permission Denied' errors in IE
  73                                                         .append(res.responseText.replace(rscript, ""))
  74
  75                                                         // Locate the specified elements
  76                                                         .find(selector) :
  77
  78                                                 // If not, just inject the full result
  79                                                 res.responseText );
  80                                 }
  81
  82                                 if ( callback ) {
  83                                         self.each( callback, [res.responseText, status, res] );
  84                                 }
  85                         }
  86                 });
  87
  88                 return this;
  89         },
  90
  91         serialize: function() {
  92                 return jQuery.param(this.serializeArray());
  93         },
  94
  95         serializeArray: function() {
  96                 return this.map(function(){
  97                         return this.elements ? jQuery.makeArray(this.elements) : this;
  98                 })
  99                 .filter(function(){
 100                         return this.name && !this.disabled &&
 101                                 (this.checked || rselectTextarea.test(this.nodeName) ||
 102                                         rinput.test(this.type));
 103                 })
 104                 .map(function(i, elem){
 105                         var val = jQuery(this).val();
 106
 107                         return val == null ?
 108                                 null :
 109                                 jQuery.isArray(val) ?
 110                                         jQuery.map( val, function(val, i){
 111                                                 return { name: elem.name, value: val.replace(rCRLF, "\r\n") };
 112                                         }) :
 113                                         { name: elem.name, value: val.replace(rCRLF, "\r\n") };
 114                 }).get();
 115         }
 116 });
 117
 118 // Attach a bunch of functions for handling common AJAX events
 119 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function(i,o){
 120         jQuery.fn[o] = function(f){
 121                 return this.bind(o, f);
 122         };
 123 });
 124
 125 jQuery.each( [ "get", "post" ], function( i, method ) {
 126         jQuery[ method ] = function( url, data, callback, type ) {
 127                 // shift arguments if data argument was omited
 128                 if ( jQuery.isFunction( data ) ) {
 129                         type = type || callback;
 130                         callback = data;
 131                         data = null;
 132                 }
 133
 134                 return jQuery.ajax({
 135                         type: method,
 136                         url: url,
 137                         data: data,
 138                         success: callback,
 139                         dataType: type
 140                 });
 141         };
 142 });
 143
 144 jQuery.extend({
 145
 146         getScript: function( url, callback ) {
 147                 return jQuery.get(url, null, callback, "script");
 148         },
 149
 150         getJSON: function( url, data, callback ) {
 151                 return jQuery.get(url, data, callback, "json");
 152         },
 153
 154         ajaxSetup: function( settings ) {
 155                 jQuery.extend( jQuery.ajaxSettings, settings );
 156         },
 157
 158         ajaxSettings: {
 159                 url: location.href,
 160                 global: true,
 161                 type: "GET",
 162                 contentType: "application/x-www-form-urlencoded",
 163                 processData: true,
 164                 async: true,
 165                 /*
 166                 timeout: 0,
 167                 data: null,
 168                 dataType: null,
 169                 dataTypes: null,
 170                 username: null,
 171                 password: null,
 172                 cache: null,
 173                 traditional: false,
 174                 */
 175                 xhr: function() {
 176                         return new window.XMLHttpRequest();
 177                 },
 178
 179                 accepts: {
 180                         xml: "application/xml, text/xml",
 181                         html: "text/html",
 182                         text: "text/plain",
 183                         json: "application/json, text/javascript",
 184                         "*": "*/*"
 185                 },
 186
 187                 contents: {
 188                         xml: /xml/,
 189                         html: /html/,
 190                         json: /json/
 191                 },
 192
 193                 // Prefilters
 194                 // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
 195                 // 2) These are called:
 196                 //    * BEFORE asking for a transport
 197                 //    * AFTER param serialization (s.data is a string if s.processData is true)
 198                 // 3) key is the dataType
 199                 // 4) the catchall symbol "*" can be used
 200                 // 5) execution will start with transport dataType and THEN continue down to "*" if needed
 201                 prefilters: {},
 202
 203                 // Transports bindings
 204                 // 1) key is the dataType
 205                 // 2) the catchall symbol "*" can be used
 206                 // 3) selection will start with transport dataType and THEN go to "*" if needed
 207                 transports: {},
 208
 209                 // List of data converters
 210                 // 1) key format is "source_type destination_type" (a single space in-between)
 211                 // 2) the catchall symbol "*" can be used for source_type
 212                 converters: {
 213
 214                         // Convert anything to text
 215                         "* text": window.String,
 216
 217                         // Text to html (true = no transformation)
 218                         "text html": true,
 219
 220                         // Evaluate text as a json expression
 221                         "text json": jQuery.parseJSON,
 222
 223                         // Parse text as xml
 224                         "text xml": jQuery.parseXML
 225                 }
 226         },
 227
 228         // Main method
 229         // (s is used internally)
 230         ajax: function( url , options , s ) {
 231
 232                 // Handle varargs
 233                 if ( arguments.length === 1 ) {
 234                         options = url;
 235                         url = options ? options.url : undefined;
 236                 }
 237
 238                 // Force options to be an object
 239                 options = options || {};
 240
 241                 // Get the url if provided separately
 242                 options.url = url || options.url;
 243
 244                 // Create the final options object
 245                 s = jQuery.extend( true , {} , jQuery.ajaxSettings , options );
 246
 247                 // We force the original context
 248                 // (plain objects used as context get extended)
 249                 s.context = options.context;
 250
 251                 var // jQuery lists
 252                         jQuery_lastModified = jQuery.lastModified,
 253                         jQuery_etag = jQuery.etag,
 254                         // Callbacks contexts
 255                         callbackContext = s.context || s,
 256                         globalEventContext = s.context ? jQuery( s.context ) : jQuery.event,
 257                         // Deferreds
 258                         deferred = jQuery.Deferred(),
 259                         completeDeferred = jQuery._Deferred(),
 260                         // Headers (they are sent all at once)
 261                         requestHeaders = {},
 262                         // Response headers
 263                         responseHeadersString,
 264                         responseHeaders,
 265                         // transport
 266                         transport,
 267                         // timeout handle
 268                         timeoutTimer,
 269                         // The jXHR state
 270                         state = 0,
 271                         // Loop variable
 272                         i,
 273                         // Fake xhr
 274                         jXHR = {
 275
 276                                 readyState: 0,
 277
 278                                 // Caches the header
 279                                 setRequestHeader: function(name,value) {
 280                                         if ( state === 0 ) {
 281                                                 requestHeaders[ name.toLowerCase() ] = value;
 282                                         }
 283                                         return this;
 284                                 },
 285
 286                                 // Raw string
 287                                 getAllResponseHeaders: function() {
 288                                         return state === 2 ? responseHeadersString : null;
 289                                 },
 290
 291                                 // Builds headers hashtable if needed
 292                                 // (match is used internally)
 293                                 getResponseHeader: function( key , match ) {
 294
 295                                         if ( state !== 2 ) {
 296                                                 return null;
 297                                         }
 298
 299                                         if ( responseHeaders === undefined ) {
 300
 301                                                 responseHeaders = {};
 302
 303                                                 if ( typeof responseHeadersString === "string" ) {
 304
 305                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 306                                                                 responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
 307                                                         }
 308                                                 }
 309                                         }
 310                                         return responseHeaders[ key.toLowerCase() ];
 311                                 },
 312
 313                                 // Cancel the request
 314                                 abort: function( statusText ) {
 315                                         if ( transport && state !== 2 ) {
 316                                                 transport.abort( statusText || "abort" );
 317                                                 done( 0 , statusText );
 318                                         }
 319                                         return this;
 320                                 }
 321                         };
 322
 323                 // Callback for when everything is done
 324                 // It is defined here because jslint complains if it is declared
 325                 // at the end of the function (which would be more logical and readable)
 326                 function done( status , statusText , response , headers) {
 327
 328                         // Called once
 329                         if ( state === 2 ) {
 330                                 return;
 331                         }
 332
 333                         // State is "done" now
 334                         state = 2;
 335
 336                         // Set readyState
 337                         jXHR.readyState = status ? 4 : 0;
 338
 339                         // Cache response headers
 340                         responseHeadersString = headers || "";
 341
 342                         // Clear timeout if it exists
 343                         if ( timeoutTimer ) {
 344                                 clearTimeout(timeoutTimer);
 345                         }
 346
 347                         var // Reference url
 348                                 url = s.url,
 349                                 // and ifModified status
 350                                 ifModified = s.ifModified,
 351
 352                                 // Is it a success?
 353                                 isSuccess = 0,
 354                                 // Stored success
 355                                 success,
 356                                 // Stored error
 357                                 error = statusText;
 358
 359                         // If not timeout, force a jQuery-compliant status text
 360                         if ( statusText != "timeout" ) {
 361                                 statusText = ( status >= 200 && status < 300 ) ?
 362                                         "success" :
 363                                         ( status === 304 ? "notmodified" : "error" );
 364                         }
 365
 366                         // If successful, handle type chaining
 367                         if ( statusText === "success" || statusText === "notmodified" ) {
 368
 369                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 370                                 if ( s.ifModified ) {
 371
 372                                         var lastModified = jXHR.getResponseHeader("Last-Modified"),
 373                                                 etag = jXHR.getResponseHeader("Etag");
 374
 375                                         if (lastModified) {
 376                                                 jQuery_lastModified[ s.url ] = lastModified;
 377                                         }
 378                                         if (etag) {
 379                                                 jQuery_etag[ s.url ] = etag;
 380                                         }
 381                                 }
 382
 383                                 if ( s.ifModified && statusText === "notmodified" ) {
 384
 385                                         success = null;
 386                                         isSuccess = 1;
 387
 388                                 } else {
 389                                         // Chain data conversions and determine the final value
 390                                         // (if an exception is thrown in the process, it'll be notified as an error)
 391                                         try {
 392
 393                                                 var i,
 394                                                         current,
 395                                                         prev,
 396                                                         checker,
 397                                                         conv,
 398                                                         conv1,
 399                                                         conv2,
 400                                                         convertion,
 401                                                         dataTypes = s.dataTypes,
 402                                                         converters = s.converters,
 403                                                         responses = {
 404                                                                 "xml": "XML",
 405                                                                 "text": "Text"
 406                                                         };
 407
 408                                                 for( i = 0 ; i < dataTypes.length ; i++ ) {
 409
 410                                                         current = dataTypes[ i ];
 411
 412                                                         if ( responses[ current ] ) {
 413                                                                 jXHR[ "response" + responses[ current ] ] = response;
 414                                                                 responses[ current ] = 0;
 415                                                         }
 416
 417                                                         if ( i ) {
 418
 419                                                                 prev = dataTypes[ i - 1 ];
 420
 421                                                                 if ( prev !== "*" && current !== "*" && prev !== current ) {
 422
 423                                                                         conv = converters[ ( conversion = prev + " " + current ) ] ||
 424                                                                                 converters[ "* " + current ];
 425
 426                                                                         conv1 = conv2 = 0;
 427
 428                                                                         if ( ! conv && prev !== "text" && current !== "text" ) {
 429                                                                                 conv1 = converters[ prev + " text" ] || converters[ "* text" ];
 430                                                                                 conv2 = converters[ "text " + current ];
 431                                                                                 if ( conv1 === true ) {
 432                                                                                         conv = conv2;
 433                                                                                 } else if ( conv2 === true ) {
 434                                                                                         conv = conv1;
 435                                                                                 }
 436                                                                         }
 437
 438                                                                         if ( ! ( conv || conv1 && conv2 ) ) {
 439                                                                                 throw conversion;
 440                                                                         }
 441
 442                                                                         if ( conv !== true ) {
 443                                                                                 response = conv ? conv( response ) : conv2( conv1( response ) );
 444                                                                         }
 445                                                                 }
 446                                                         } else if ( s.dataFilter ) {
 447
 448                                                                 response = s.dataFilter( response );
 449                                                                 dataTypes = s.dataTypes;
 450                                                         }
 451                                                 }
 452
 453                                                 // We have a real success
 454                                                 success = response;
 455                                                 isSuccess = 1;
 456
 457                                         } catch(e) {
 458
 459                                                 statusText = "parsererror";
 460                                                 error = "" + e;
 461
 462                                         }
 463                                 }
 464
 465                         } else { // if not success, mark it as an error
 466
 467                                         error = error || statusText;
 468
 469                                         // Set responseText if needed
 470                                         if ( response ) {
 471                                                 jXHR.responseText = response;
 472                                         }
 473                         }
 474
 475                         // Set data for the fake xhr object
 476                         jXHR.status = status;
 477                         jXHR.statusText = statusText;
 478
 479                         // Success/Error
 480                         if ( isSuccess ) {
 481                                 deferred.fire( callbackContext , [ success , statusText , jXHR ] );
 482                         } else {
 483                                 deferred.fireReject( callbackContext , [ jXHR , statusText , error ] );
 484                         }
 485
 486                         if ( s.global ) {
 487                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
 488                                                 [ jXHR , s , isSuccess ? success : error ] );
 489                         }
 490
 491                         // Complete
 492                         completeDeferred.fire( callbackContext, [ jXHR , statusText ] );
 493
 494                         if ( s.global ) {
 495                                 globalEventContext.trigger( "ajaxComplete" , [ jXHR , s] );
 496                                 // Handle the global AJAX counter
 497                                 if ( ! --jQuery.active ) {
 498                                         jQuery.event.trigger( "ajaxStop" );
 499                                 }
 500                         }
 501                 }
 502
 503                 // Attach deferreds
 504                 deferred.promise( jXHR );
 505                 jXHR.success = jXHR.done;
 506                 jXHR.error = jXHR.fail;
 507                 jXHR.complete = completeDeferred.done;
 508
 509                 // Remove hash character (#7531: and string promotion)
 510                 s.url = ( "" + s.url ).replace( rhash , "" );
 511
 512                 // Uppercase the type
 513                 s.type = s.type.toUpperCase();
 514
 515                 // Determine if request has content
 516                 s.hasContent = ! rnoContent.test( s.type );
 517
 518                 // Extract dataTypes list
 519                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
 520
 521                 // Determine if a cross-domain request is in order
 522                 var parts = rurl.exec( s.url.toLowerCase() ),
 523                         loc = location;
 524
 525                 if ( ! s.crossDomain ) {
 526                         s.crossDomain = !!(
 527                                         parts &&
 528                                         ( parts[ 1 ] && parts[ 1 ] != loc.protocol ||
 529                                                 parts[ 2 ] != loc.hostname ||
 530                                                 ( parts[ 3 ] || 80 ) != ( loc.port || 80 ) )
 531                         );
 532                 }
 533
 534                 // Convert data if not already a string
 535                 if ( s.data && s.processData && typeof s.data != "string" ) {
 536                         s.data = jQuery.param( s.data , s.traditional );
 537                 }
 538
 539                 // Get transport
 540                 transport = jQuery.ajax.prefilter( s , options ).transport( s );
 541
 542                 // Watch for a new set of requests
 543                 if ( s.global && jQuery.active++ === 0 ) {
 544                         jQuery.event.trigger( "ajaxStart" );
 545                 }
 546
 547                 // If no transport, we auto-abort
 548                 if ( ! transport ) {
 549
 550                         done( 0 , "transport not found" );
 551                         jXHR = false;
 552
 553                 } else {
 554
 555                         // More options handling for requests with no content
 556                         if ( ! s.hasContent ) {
 557
 558                                 // If data is available, append data to url
 559                                 if ( s.data ) {
 560                                         s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 561                                 }
 562
 563                                 // Add anti-cache in url if needed
 564                                 if ( s.cache === false ) {
 565
 566                                         var ts = jQuery.now(),
 567                                                 // try replacing _= if it is there
 568                                                 ret = s.url.replace( rts , "$1_=" + ts );
 569
 570                                         // if nothing was replaced, add timestamp to the end
 571                                         s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
 572                                 }
 573                         }
 574
 575                         // Set the correct header, if data is being sent
 576                         if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 577                                 requestHeaders[ "content-type" ] = s.contentType;
 578                         }
 579
 580                         // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 581                         if ( s.ifModified ) {
 582                                 if ( jQuery_lastModified[ s.url ] ) {
 583                                         requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
 584                                 }
 585                                 if ( jQuery_etag[ s.url ] ) {
 586                                         requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
 587                                 }
 588                         }
 589
 590                         // Set the Accepts header for the server, depending on the dataType
 591                         requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
 592                                 s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 593                                 s.accepts[ "*" ];
 594
 595                         // Check for headers option
 596                         for ( i in s.headers ) {
 597                                 requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
 598                         }
 599
 600                         // Allow custom headers/mimetypes and early abort
 601                         if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
 602
 603                                         // Abort if not done already
 604                                         done( 0 , "abort" );
 605                                         jXHR = false;
 606
 607                         } else {
 608
 609                                 // Set state as sending
 610                                 state = 1;
 611                                 jXHR.readyState = 1;
 612
 613                                 // Install callbacks on deferreds
 614                                 for ( i in { success:1, error:1, complete:1 } ) {
 615                                         jXHR[ i ]( s[ i ] );
 616                                 }
 617
 618                                 // Send global event
 619                                 if ( s.global ) {
 620                                         globalEventContext.trigger( "ajaxSend" , [ jXHR , s ] );
 621                                 }
 622
 623                                 // Timeout
 624                                 if ( s.async && s.timeout > 0 ) {
 625                                         timeoutTimer = setTimeout(function(){
 626                                                 jXHR.abort( "timeout" );
 627                                         }, s.timeout);
 628                                 }
 629
 630                                 // Try to send
 631                                 try {
 632                                         transport.send(requestHeaders, done);
 633                                 } catch (e) {
 634                                         // Propagate exception as error if not done
 635                                         if ( status === 1 ) {
 636
 637                                                 done(0, "error", "" + e);
 638                                                 jXHR = false;
 639
 640                                         // Simply rethrow otherwise
 641                                         } else {
 642                                                 jQuery.error(e);
 643                                         }
 644                                 }
 645                         }
 646                 }
 647
 648                 return jXHR;
 649         },
 650
 651         // Serialize an array of form elements or a set of
 652         // key/values into a query string
 653         param: function( a, traditional ) {
 654                 var s = [],
 655                         add = function( key, value ) {
 656                                 // If value is a function, invoke it and return its value
 657                                 value = jQuery.isFunction(value) ? value() : value;
 658                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 659                         };
 660
 661                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 662                 if ( traditional === undefined ) {
 663                         traditional = jQuery.ajaxSettings.traditional;
 664                 }
 665
 666                 // If an array was passed in, assume that it is an array of form elements.
 667                 if ( jQuery.isArray(a) || a.jquery ) {
 668                         // Serialize the form elements
 669                         jQuery.each( a, function() {
 670                                 add( this.name, this.value );
 671                         });
 672
 673                 } else {
 674                         // If traditional, encode the "old" way (the way 1.3.2 or older
 675                         // did it), otherwise encode params recursively.
 676                         for ( var prefix in a ) {
 677                                 buildParams( prefix, a[prefix], traditional, add );
 678                         }
 679                 }
 680
 681                 // Return the resulting serialization
 682                 return s.join("&").replace(r20, "+");
 683         }
 684 });
 685
 686 function buildParams( prefix, obj, traditional, add ) {
 687         if ( jQuery.isArray(obj) && obj.length ) {
 688                 // Serialize array item.
 689                 jQuery.each( obj, function( i, v ) {
 690                         if ( traditional || rbracket.test( prefix ) ) {
 691                                 // Treat each array item as a scalar.
 692                                 add( prefix, v );
 693
 694                         } else {
 695                                 // If array item is non-scalar (array or object), encode its
 696                                 // numeric index to resolve deserialization ambiguity issues.
 697                                 // Note that rack (as of 1.0.0) can't currently deserialize
 698                                 // nested arrays properly, and attempting to do so may cause
 699                                 // a server error. Possible fixes are to modify rack's
 700                                 // deserialization algorithm or to provide an option or flag
 701                                 // to force array serialization to be shallow.
 702                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 703                         }
 704                 });
 705
 706         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 707                 // If we see an array here, it is empty and should be treated as an empty
 708                 // object
 709                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 710                         add( prefix, "" );
 711
 712                 // Serialize object item.
 713                 } else {
 714                         jQuery.each( obj, function( k, v ) {
 715                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 716                         });
 717                 }
 718
 719         } else {
 720                 // Serialize scalar item.
 721                 add( prefix, obj );
 722         }
 723 }
 724
 725 // This is still on the jQuery object... for now
 726 // Want to move this to jQuery.ajax some day
 727 jQuery.extend({
 728
 729         // Counter for holding the number of active queries
 730         active: 0,
 731
 732         // Last-Modified header cache for next request
 733         lastModified: {},
 734         etag: {}
 735
 736 });
 737
 738 //Execute or select from functions in a given structure of options
 739 function ajax_selectOrExecute( structure , s ) {
 740
 741         var dataTypes = s.dataTypes,
 742                 transportDataType,
 743                 list,
 744                 selected,
 745                 i,
 746                 length,
 747                 checked = {},
 748                 flag,
 749                 noSelect = structure !== "transports";
 750
 751         function initSearch( dataType ) {
 752
 753                 flag = transportDataType !== dataType && ! checked[ dataType ];
 754
 755                 if ( flag ) {
 756
 757                         checked[ dataType ] = 1;
 758                         transportDataType = dataType;
 759                         list = s[ structure ][ dataType ];
 760                         i = -1;
 761                         length = list ? list.length : 0 ;
 762                 }
 763
 764                 return flag;
 765         }
 766
 767         initSearch( dataTypes[ 0 ] );
 768
 769         for ( i = 0 ; ( noSelect || ! selected ) && i <= length ; i++ ) {
 770
 771                 if ( i === length ) {
 772
 773                         initSearch( "*" );
 774
 775                 } else {
 776
 777                         selected = list[ i ]( s , determineDataType );
 778
 779                         // If we got redirected to another dataType
 780                         // Search there (if not in progress or already tried)
 781                         if ( typeof( selected ) === "string" &&
 782                                 initSearch( selected ) ) {
 783
 784                                 dataTypes.unshift( selected );
 785                                 selected = 0;
 786                         }
 787                 }
 788         }
 789
 790         return noSelect ? jQuery.ajax : selected;
 791 }
 792
 793 // Add an element to one of the structures in ajaxSettings
 794 function ajax_addElement( structure , args ) {
 795
 796         var i,
 797                 start = 0,
 798                 length = args.length,
 799                 dataTypes = [ "*" ],
 800                 dLength = 1,
 801                 dataType,
 802                 functors = [],
 803                 first,
 804                 append,
 805                 list;
 806
 807         if ( length ) {
 808
 809                 first = jQuery.type( args[ 0 ] );
 810
 811                 if ( first === "object" ) {
 812                         return ajax_selectOrExecute( structure , args[ 0 ] );
 813                 }
 814
 815                 structure = jQuery.ajaxSettings[ structure ];
 816
 817                 if ( first !== "function" ) {
 818
 819                         dataTypes = args[ 0 ].toLowerCase().split(/\s+/);
 820                         dLength = dataTypes.length;
 821                         start = 1;
 822
 823                 }
 824
 825                 if ( dLength && start < length ) {
 826
 827                         functors = sliceFunc.call( args , start );
 828
 829                         for( i = 0 ; i < dLength ; i++ ) {
 830
 831                                 dataType = dataTypes[ i ];
 832
 833                                 first = /^\+/.test( dataType );
 834
 835                                 if (first) {
 836                                         dataType = dataType.substr(1);
 837                                 }
 838
 839                                 if ( dataType !== "" ) {
 840
 841                                         append = Array.prototype[ first ? "unshift" : "push" ];
 842                                         list = structure[ dataType ] = structure[ dataType ] || [];
 843                                         append.apply( list , functors );
 844                                 }
 845                         }
 846                 }
 847         }
 848
 849         return jQuery.ajax;
 850 }
 851
 852 // Install prefilter & transport methods
 853 jQuery.each( [ "prefilter" , "transport" ] , function( _ , name ) {
 854         _ = name + "s";
 855         jQuery.ajax[ name ] = function() {
 856                 return ajax_addElement( _ , arguments );
 857         };
 858 } );
 859
 860 // Utility function that handles dataType when response is received
 861 // (for those transports that can give text or xml responses)
 862 function determineDataType( s , ct , text , xml ) {
 863
 864         var contents = s.contents,
 865                 type,
 866                 regexp,
 867                 dataTypes = s.dataTypes,
 868                 transportDataType = dataTypes[0],
 869                 response;
 870
 871         // Auto (xml, json, script or text determined given headers)
 872         if ( transportDataType === "*" ) {
 873
 874                 for ( type in contents ) {
 875                         if ( ( regexp = contents[ type ] ) && regexp.test( ct ) ) {
 876                                 transportDataType = dataTypes[0] = type;
 877                                 break;
 878                         }
 879                 }
 880         }
 881
 882         // xml and parsed as such
 883         if ( transportDataType === "xml" &&
 884                 xml &&
 885                 xml.documentElement /* #4958 */ ) {
 886
 887                 response = xml;
 888
 889         // Text response was provided
 890         } else {
 891
 892                 response = text;
 893
 894                 // If it's not really text, defer to converters
 895                 if ( transportDataType !== "text" ) {
 896                         dataTypes.unshift( "text" );
 897                 }
 898
 899         }
 900
 901         return response;
 902 }
 903
 904 /*
 905  * Create the request object; Microsoft failed to properly
 906  * implement the XMLHttpRequest in IE7 (can't request local files),
 907  * so we use the ActiveXObject when it is available
 908  * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
 909  * we need a fallback.
 910  */
 911 if ( window.ActiveXObject ) {
 912         jQuery.ajaxSettings.xhr = function() {
 913         if ( window.location.protocol !== "file:" ) {
 914                 try {
 915                         return new window.XMLHttpRequest();
 916                 } catch( xhrError ) {}
 917         }
 918
 919         try {
 920                 return new window.ActiveXObject("Microsoft.XMLHTTP");
 921         } catch( activeError ) {}
 922         };
 923 }
 924
 925 var testXHR = jQuery.ajaxSettings.xhr();
 926
 927 // Does this browser support XHR requests?
 928 jQuery.support.ajax = !!testXHR;
 929
 930 // Does this browser support crossDomain XHR requests
 931 jQuery.support.cors = testXHR && "withCredentials" in testXHR;
 932
 933 })( jQuery );