src/ajax.js

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