src/ajax.js

   1 (function( jQuery ) {
   2
   3 var r20 = /%20/g,
   4         rbracket = /\[\]$/,
   5         rCRLF = /\r?\n/g,
   6         rhash = /#.*$/,
   7         rheaders = /^(.*?):[ \t]*([^\r\n]*)\r?$/mg, // IE leaves an \r character at EOL
   8         rinput = /^(?:color|date|datetime|datetime-local|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
   9         // #7653, #8125, #8152: local protocol detection
  10         rlocalProtocol = /^(?:about|app|app\-storage|.+\-extension|file|res|widget):$/,
  11         rnoContent = /^(?:GET|HEAD)$/,
  12         rprotocol = /^\/\//,
  13         rquery = /\?/,
  14         rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
  15         rselectTextarea = /^(?:select|textarea)/i,
  16         rspacesAjax = /\s+/,
  17         rts = /([?&])_=[^&]*/,
  18         rurl = /^([\w\+\.\-]+:)(?:\/\/([^\/?#:]*)(?::(\d+))?)?/,
  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         // Document location
  42         ajaxLocation,
  43
  44         // Document location segments
  45         ajaxLocParts,
  46
  47         // Avoid comment-prolog char sequence (#10098); must appease lint and evade compression
  48         allTypes = ["*/"] + ["*"];
  49
  50 // #8138, IE may throw an exception when accessing
  51 // a field from window.location if document.domain has been set
  52 try {
  53         ajaxLocation = location.href;
  54 } catch( e ) {
  55         // Use the href attribute of an A element
  56         // since IE will modify it given document.location
  57         ajaxLocation = document.createElement( "a" );
  58         ajaxLocation.href = "";
  59         ajaxLocation = ajaxLocation.href;
  60 }
  61
  62 // Segment location into parts
  63 ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() ) || [];
  64
  65 // Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
  66 function addToPrefiltersOrTransports( structure ) {
  67
  68         // dataTypeExpression is optional and defaults to "*"
  69         return function( dataTypeExpression, func ) {
  70
  71                 if ( typeof dataTypeExpression !== "string" ) {
  72                         func = dataTypeExpression;
  73                         dataTypeExpression = "*";
  74                 }
  75
  76                 if ( jQuery.isFunction( func ) ) {
  77                         var dataTypes = dataTypeExpression.toLowerCase().split( rspacesAjax ),
  78                                 i = 0,
  79                                 length = dataTypes.length,
  80                                 dataType,
  81                                 list,
  82                                 placeBefore;
  83
  84                         // For each dataType in the dataTypeExpression
  85                         for ( ; i < length; i++ ) {
  86                                 dataType = dataTypes[ i ];
  87                                 // We control if we're asked to add before
  88                                 // any existing element
  89                                 placeBefore = /^\+/.test( dataType );
  90                                 if ( placeBefore ) {
  91                                         dataType = dataType.substr( 1 ) || "*";
  92                                 }
  93                                 list = structure[ dataType ] = structure[ dataType ] || [];
  94                                 // then we add to the structure accordingly
  95                                 list[ placeBefore ? "unshift" : "push" ]( func );
  96                         }
  97                 }
  98         };
  99 }
 100
 101 // Base inspection function for prefilters and transports
 102 function inspectPrefiltersOrTransports( structure, options, originalOptions, jqXHR,
 103                 dataType /* internal */, inspected /* internal */ ) {
 104
 105         dataType = dataType || options.dataTypes[ 0 ];
 106         inspected = inspected || {};
 107
 108         inspected[ dataType ] = true;
 109
 110         var list = structure[ dataType ],
 111                 i = 0,
 112                 length = list ? list.length : 0,
 113                 executeOnly = ( structure === prefilters ),
 114                 selection;
 115
 116         for ( ; i < length && ( executeOnly || !selection ); i++ ) {
 117                 selection = list[ i ]( options, originalOptions, jqXHR );
 118                 // If we got redirected to another dataType
 119                 // we try there if executing only and not done already
 120                 if ( typeof selection === "string" ) {
 121                         if ( !executeOnly || inspected[ selection ] ) {
 122                                 selection = undefined;
 123                         } else {
 124                                 options.dataTypes.unshift( selection );
 125                                 selection = inspectPrefiltersOrTransports(
 126                                                 structure, options, originalOptions, jqXHR, selection, inspected );
 127                         }
 128                 }
 129         }
 130         // If we're only executing or nothing was selected
 131         // we try the catchall dataType if not done already
 132         if ( ( executeOnly || !selection ) && !inspected[ "*" ] ) {
 133                 selection = inspectPrefiltersOrTransports(
 134                                 structure, options, originalOptions, jqXHR, "*", inspected );
 135         }
 136         // unnecessary when only executing (prefilters)
 137         // but it'll be ignored by the caller in that case
 138         return selection;
 139 }
 140
 141 // A special extend for ajax options
 142 // that takes "flat" options (not to be deep extended)
 143 // Fixes #9887
 144 function ajaxExtend( target, src ) {
 145         var key, deep,
 146                 flatOptions = jQuery.ajaxSettings.flatOptions || {};
 147         for ( key in src ) {
 148                 if ( src[ key ] !== undefined ) {
 149                         ( flatOptions[ key ] ? target : ( deep || ( deep = {} ) ) )[ key ] = src[ key ];
 150                 }
 151         }
 152         if ( deep ) {
 153                 jQuery.extend( true, target, deep );
 154         }
 155 }
 156
 157 jQuery.fn.extend({
 158         load: function( url, params, callback ) {
 159                 if ( typeof url !== "string" && _load ) {
 160                         return _load.apply( this, arguments );
 161
 162                 // Don't do a request if no elements are being requested
 163                 } else if ( !this.length ) {
 164                         return this;
 165                 }
 166
 167                 var off = url.indexOf( " " );
 168                 if ( off >= 0 ) {
 169                         var selector = url.slice( off, url.length );
 170                         url = url.slice( 0, off );
 171                 }
 172
 173                 // Default to a GET request
 174                 var type = "GET";
 175
 176                 // If the second parameter was provided
 177                 if ( params ) {
 178                         // If it's a function
 179                         if ( jQuery.isFunction( params ) ) {
 180                                 // We assume that it's the callback
 181                                 callback = params;
 182                                 params = undefined;
 183
 184                         // Otherwise, build a param string
 185                         } else if ( typeof params === "object" ) {
 186                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
 187                                 type = "POST";
 188                         }
 189                 }
 190
 191                 var self = this;
 192
 193                 // Request the remote document
 194                 jQuery.ajax({
 195                         url: url,
 196                         type: type,
 197                         dataType: "html",
 198                         data: params,
 199                         // Complete callback (responseText is used internally)
 200                         complete: function( jqXHR, status, responseText ) {
 201                                 // Store the response as specified by the jqXHR object
 202                                 responseText = jqXHR.responseText;
 203                                 // If successful, inject the HTML into all the matched elements
 204                                 if ( jqXHR.isResolved() ) {
 205                                         // #4825: Get the actual response in case
 206                                         // a dataFilter is present in ajaxSettings
 207                                         jqXHR.done(function( r ) {
 208                                                 responseText = r;
 209                                         });
 210                                         // See if a selector was specified
 211                                         self.html( selector ?
 212                                                 // Create a dummy div to hold the results
 213                                                 jQuery("<div>")
 214                                                         // inject the contents of the document in, removing the scripts
 215                                                         // to avoid any 'Permission Denied' errors in IE
 216                                                         .append(responseText.replace(rscript, ""))
 217
 218                                                         // Locate the specified elements
 219                                                         .find(selector) :
 220
 221                                                 // If not, just inject the full result
 222                                                 responseText );
 223                                 }
 224
 225                                 if ( callback ) {
 226                                         self.each( callback, [ responseText, status, jqXHR ] );
 227                                 }
 228                         }
 229                 });
 230
 231                 return this;
 232         },
 233
 234         serialize: function() {
 235                 return jQuery.param( this.serializeArray() );
 236         },
 237
 238         serializeArray: function() {
 239                 return this.map(function(){
 240                         return this.elements ? jQuery.makeArray( this.elements ) : this;
 241                 })
 242                 .filter(function(){
 243                         return this.name && !this.disabled &&
 244                                 ( this.checked || rselectTextarea.test( this.nodeName ) ||
 245                                         rinput.test( this.type ) );
 246                 })
 247                 .map(function( i, elem ){
 248                         var val = jQuery( this ).val();
 249
 250                         return val == null ?
 251                                 null :
 252                                 jQuery.isArray( val ) ?
 253                                         jQuery.map( val, function( val, i ){
 254                                                 return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 255                                         }) :
 256                                         { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
 257                 }).get();
 258         }
 259 });
 260
 261 // Attach a bunch of functions for handling common AJAX events
 262 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split( " " ), function( i, o ){
 263         jQuery.fn[ o ] = function( f ){
 264                 return this.bind( o, f );
 265         };
 266 });
 267
 268 jQuery.each( [ "get", "post" ], function( i, method ) {
 269         jQuery[ method ] = function( url, data, callback, type ) {
 270                 // shift arguments if data argument was omitted
 271                 if ( jQuery.isFunction( data ) ) {
 272                         type = type || callback;
 273                         callback = data;
 274                         data = undefined;
 275                 }
 276
 277                 return jQuery.ajax({
 278                         type: method,
 279                         url: url,
 280                         data: data,
 281                         success: callback,
 282                         dataType: type
 283                 });
 284         };
 285 });
 286
 287 jQuery.extend({
 288
 289         getScript: function( url, callback ) {
 290                 return jQuery.get( url, undefined, callback, "script" );
 291         },
 292
 293         getJSON: function( url, data, callback ) {
 294                 return jQuery.get( url, data, callback, "json" );
 295         },
 296
 297         // Creates a full fledged settings object into target
 298         // with both ajaxSettings and settings fields.
 299         // If target is omitted, writes into ajaxSettings.
 300         ajaxSetup: function( target, settings ) {
 301                 if ( settings ) {
 302                         // Building a settings object
 303                         ajaxExtend( target, jQuery.ajaxSettings );
 304                 } else {
 305                         // Extending ajaxSettings
 306                         settings = target;
 307                         target = jQuery.ajaxSettings;
 308                 }
 309                 ajaxExtend( target, settings );
 310                 return target;
 311         },
 312
 313         ajaxSettings: {
 314                 url: ajaxLocation,
 315                 isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ),
 316                 global: true,
 317                 type: "GET",
 318                 contentType: "application/x-www-form-urlencoded",
 319                 processData: true,
 320                 async: true,
 321                 /*
 322                 timeout: 0,
 323                 data: null,
 324                 dataType: null,
 325                 username: null,
 326                 password: null,
 327                 cache: null,
 328                 traditional: false,
 329                 headers: {},
 330                 */
 331
 332                 accepts: {
 333                         xml: "application/xml, text/xml",
 334                         html: "text/html",
 335                         text: "text/plain",
 336                         json: "application/json, text/javascript",
 337                         "*": allTypes
 338                 },
 339
 340                 contents: {
 341                         xml: /xml/,
 342                         html: /html/,
 343                         json: /json/
 344                 },
 345
 346                 responseFields: {
 347                         xml: "responseXML",
 348                         text: "responseText"
 349                 },
 350
 351                 // List of data converters
 352                 // 1) key format is "source_type destination_type" (a single space in-between)
 353                 // 2) the catchall symbol "*" can be used for source_type
 354                 converters: {
 355
 356                         // Convert anything to text
 357                         "* text": window.String,
 358
 359                         // Text to html (true = no transformation)
 360                         "text html": true,
 361
 362                         // Evaluate text as a json expression
 363                         "text json": jQuery.parseJSON,
 364
 365                         // Parse text as xml
 366                         "text xml": jQuery.parseXML
 367                 },
 368
 369                 // For options that shouldn't be deep extended:
 370                 // you can add your own custom options here if
 371                 // and when you create one that shouldn't be
 372                 // deep extended (see ajaxExtend)
 373                 flatOptions: {
 374                         context: true,
 375                         url: true
 376                 }
 377         },
 378
 379         ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
 380         ajaxTransport: addToPrefiltersOrTransports( transports ),
 381
 382         // Main method
 383         ajax: function( url, options ) {
 384
 385                 // If url is an object, simulate pre-1.5 signature
 386                 if ( typeof url === "object" ) {
 387                         options = url;
 388                         url = undefined;
 389                 }
 390
 391                 // Force options to be an object
 392                 options = options || {};
 393
 394                 var // Create the final options object
 395                         s = jQuery.ajaxSetup( {}, options ),
 396                         // Callbacks context
 397                         callbackContext = s.context || s,
 398                         // Context for global events
 399                         // It's the callbackContext if one was provided in the options
 400                         // and if it's a DOM node or a jQuery collection
 401                         globalEventContext = callbackContext !== s &&
 402                                 ( callbackContext.nodeType || callbackContext instanceof jQuery ) ?
 403                                                 jQuery( callbackContext ) : jQuery.event,
 404                         // Deferreds
 405                         deferred = jQuery.Deferred(),
 406                         completeDeferred = jQuery.Callbacks( "once memory" ),
 407                         // Status-dependent callbacks
 408                         statusCode = s.statusCode || {},
 409                         // ifModified key
 410                         ifModifiedKey,
 411                         // Headers (they are sent all at once)
 412                         requestHeaders = {},
 413                         requestHeadersNames = {},
 414                         // Response headers
 415                         responseHeadersString,
 416                         responseHeaders,
 417                         // transport
 418                         transport,
 419                         // timeout handle
 420                         timeoutTimer,
 421                         // Cross-domain detection vars
 422                         parts,
 423                         // The jqXHR state
 424                         state = 0,
 425                         // To know if global events are to be dispatched
 426                         fireGlobals,
 427                         // Loop variable
 428                         i,
 429                         // Fake xhr
 430                         jqXHR = {
 431
 432                                 readyState: 0,
 433
 434                                 // Caches the header
 435                                 setRequestHeader: function( name, value ) {
 436                                         if ( !state ) {
 437                                                 var lname = name.toLowerCase();
 438                                                 name = requestHeadersNames[ lname ] = requestHeadersNames[ lname ] || name;
 439                                                 requestHeaders[ name ] = value;
 440                                         }
 441                                         return this;
 442                                 },
 443
 444                                 // Raw string
 445                                 getAllResponseHeaders: function() {
 446                                         return state === 2 ? responseHeadersString : null;
 447                                 },
 448
 449                                 // Builds headers hashtable if needed
 450                                 getResponseHeader: function( key ) {
 451                                         var match;
 452                                         if ( state === 2 ) {
 453                                                 if ( !responseHeaders ) {
 454                                                         responseHeaders = {};
 455                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 456                                                                 responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
 457                                                         }
 458                                                 }
 459                                                 match = responseHeaders[ key.toLowerCase() ];
 460                                         }
 461                                         return match === undefined ? null : match;
 462                                 },
 463
 464                                 // Overrides response content-type header
 465                                 overrideMimeType: function( type ) {
 466                                         if ( !state ) {
 467                                                 s.mimeType = type;
 468                                         }
 469                                         return this;
 470                                 },
 471
 472                                 // Cancel the request
 473                                 abort: function( statusText ) {
 474                                         statusText = statusText || "abort";
 475                                         if ( transport ) {
 476                                                 transport.abort( statusText );
 477                                         }
 478                                         done( 0, statusText );
 479                                         return this;
 480                                 }
 481                         };
 482
 483                 // Callback for when everything is done
 484                 // It is defined here because jslint complains if it is declared
 485                 // at the end of the function (which would be more logical and readable)
 486                 function done( status, nativeStatusText, responses, headers ) {
 487
 488                         // Called once
 489                         if ( state === 2 ) {
 490                                 return;
 491                         }
 492
 493                         // State is "done" now
 494                         state = 2;
 495
 496                         // Clear timeout if it exists
 497                         if ( timeoutTimer ) {
 498                                 clearTimeout( timeoutTimer );
 499                         }
 500
 501                         // Dereference transport for early garbage collection
 502                         // (no matter how long the jqXHR object will be used)
 503                         transport = undefined;
 504
 505                         // Cache response headers
 506                         responseHeadersString = headers || "";
 507
 508                         // Set readyState
 509                         jqXHR.readyState = status > 0 ? 4 : 0;
 510
 511                         var isSuccess,
 512                                 success,
 513                                 error,
 514                                 statusText = nativeStatusText,
 515                                 response = responses ? ajaxHandleResponses( s, jqXHR, responses ) : undefined,
 516                                 lastModified,
 517                                 etag;
 518
 519                         // If successful, handle type chaining
 520                         if ( status >= 200 && status < 300 || status === 304 ) {
 521
 522                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 523                                 if ( s.ifModified ) {
 524
 525                                         if ( ( lastModified = jqXHR.getResponseHeader( "Last-Modified" ) ) ) {
 526                                                 jQuery.lastModified[ ifModifiedKey ] = lastModified;
 527                                         }
 528                                         if ( ( etag = jqXHR.getResponseHeader( "Etag" ) ) ) {
 529                                                 jQuery.etag[ ifModifiedKey ] = etag;
 530                                         }
 531                                 }
 532
 533                                 // If not modified
 534                                 if ( status === 304 ) {
 535
 536                                         statusText = "notmodified";
 537                                         isSuccess = true;
 538
 539                                 // If we have data
 540                                 } else {
 541
 542                                         try {
 543                                                 success = ajaxConvert( s, response );
 544                                                 statusText = "success";
 545                                                 isSuccess = true;
 546                                         } catch(e) {
 547                                                 // We have a parsererror
 548                                                 statusText = "parsererror";
 549                                                 error = e;
 550                                         }
 551                                 }
 552                         } else {
 553                                 // We extract error from statusText
 554                                 // then normalize statusText and status for non-aborts
 555                                 error = statusText;
 556                                 if ( !statusText || status ) {
 557                                         statusText = "error";
 558                                         if ( status < 0 ) {
 559                                                 status = 0;
 560                                         }
 561                                 }
 562                         }
 563
 564                         // Set data for the fake xhr object
 565                         jqXHR.status = status;
 566                         jqXHR.statusText = "" + ( nativeStatusText || statusText );
 567
 568                         // Success/Error
 569                         if ( isSuccess ) {
 570                                 deferred.resolveWith( callbackContext, [ success, statusText, jqXHR ] );
 571                         } else {
 572                                 deferred.rejectWith( callbackContext, [ jqXHR, statusText, error ] );
 573                         }
 574
 575                         // Status-dependent callbacks
 576                         jqXHR.statusCode( statusCode );
 577                         statusCode = undefined;
 578
 579                         if ( fireGlobals ) {
 580                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ),
 581                                                 [ jqXHR, s, isSuccess ? success : error ] );
 582                         }
 583
 584                         // Complete
 585                         completeDeferred.fireWith( callbackContext, [ jqXHR, statusText ] );
 586
 587                         if ( fireGlobals ) {
 588                                 globalEventContext.trigger( "ajaxComplete", [ jqXHR, s ] );
 589                                 // Handle the global AJAX counter
 590                                 if ( !( --jQuery.active ) ) {
 591                                         jQuery.event.trigger( "ajaxStop" );
 592                                 }
 593                         }
 594                 }
 595
 596                 // Attach deferreds
 597                 deferred.promise( jqXHR );
 598                 jqXHR.success = jqXHR.done;
 599                 jqXHR.error = jqXHR.fail;
 600                 jqXHR.complete = completeDeferred.add;
 601
 602                 // Status-dependent callbacks
 603                 jqXHR.statusCode = function( map ) {
 604                         if ( map ) {
 605                                 var tmp;
 606                                 if ( state < 2 ) {
 607                                         for ( tmp in map ) {
 608                                                 statusCode[ tmp ] = [ statusCode[tmp], map[tmp] ];
 609                                         }
 610                                 } else {
 611                                         tmp = map[ jqXHR.status ];
 612                                         jqXHR.then( tmp, tmp );
 613                                 }
 614                         }
 615                         return this;
 616                 };
 617
 618                 // Remove hash character (#7531: and string promotion)
 619                 // Add protocol if not provided (#5866: IE7 issue with protocol-less urls)
 620                 // We also use the url parameter if available
 621                 s.url = ( ( url || s.url ) + "" ).replace( rhash, "" ).replace( rprotocol, ajaxLocParts[ 1 ] + "//" );
 622
 623                 // Extract dataTypes list
 624                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
 625
 626                 // Determine if a cross-domain request is in order
 627                 if ( s.crossDomain == null ) {
 628                         parts = rurl.exec( s.url.toLowerCase() );
 629                         s.crossDomain = !!( parts &&
 630                                 ( parts[ 1 ] != ajaxLocParts[ 1 ] || parts[ 2 ] != ajaxLocParts[ 2 ] ||
 631                                         ( parts[ 3 ] || ( parts[ 1 ] === "http:" ? 80 : 443 ) ) !=
 632                                                 ( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? 80 : 443 ) ) )
 633                         );
 634                 }
 635
 636                 // Convert data if not already a string
 637                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 638                         s.data = jQuery.param( s.data, s.traditional );
 639                 }
 640
 641                 // Apply prefilters
 642                 inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );
 643
 644                 // If request was aborted inside a prefiler, stop there
 645                 if ( state === 2 ) {
 646                         return false;
 647                 }
 648
 649                 // We can fire global events as of now if asked to
 650                 fireGlobals = s.global;
 651
 652                 // Uppercase the type
 653                 s.type = s.type.toUpperCase();
 654
 655                 // Determine if request has content
 656                 s.hasContent = !rnoContent.test( s.type );
 657
 658                 // Watch for a new set of requests
 659                 if ( fireGlobals && jQuery.active++ === 0 ) {
 660                         jQuery.event.trigger( "ajaxStart" );
 661                 }
 662
 663                 // More options handling for requests with no content
 664                 if ( !s.hasContent ) {
 665
 666                         // If data is available, append data to url
 667                         if ( s.data ) {
 668                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 669                                 // #9682: remove data so that it's not used in an eventual retry
 670                                 delete s.data;
 671                         }
 672
 673                         // Get ifModifiedKey before adding the anti-cache parameter
 674                         ifModifiedKey = s.url;
 675
 676                         // Add anti-cache in url if needed
 677                         if ( s.cache === false ) {
 678
 679                                 var ts = jQuery.now(),
 680                                         // try replacing _= if it is there
 681                                         ret = s.url.replace( rts, "$1_=" + ts );
 682
 683                                 // if nothing was replaced, add timestamp to the end
 684                                 s.url = ret + ( ( ret === s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "" );
 685                         }
 686                 }
 687
 688                 // Set the correct header, if data is being sent
 689                 if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
 690                         jqXHR.setRequestHeader( "Content-Type", s.contentType );
 691                 }
 692
 693                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 694                 if ( s.ifModified ) {
 695                         ifModifiedKey = ifModifiedKey || s.url;
 696                         if ( jQuery.lastModified[ ifModifiedKey ] ) {
 697                                 jqXHR.setRequestHeader( "If-Modified-Since", jQuery.lastModified[ ifModifiedKey ] );
 698                         }
 699                         if ( jQuery.etag[ ifModifiedKey ] ) {
 700                                 jqXHR.setRequestHeader( "If-None-Match", jQuery.etag[ ifModifiedKey ] );
 701                         }
 702                 }
 703
 704                 // Set the Accepts header for the server, depending on the dataType
 705                 jqXHR.setRequestHeader(
 706                         "Accept",
 707                         s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
 708                                 s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", " + allTypes + "; q=0.01" : "" ) :
 709                                 s.accepts[ "*" ]
 710                 );
 711
 712                 // Check for headers option
 713                 for ( i in s.headers ) {
 714                         jqXHR.setRequestHeader( i, s.headers[ i ] );
 715                 }
 716
 717                 // Allow custom headers/mimetypes and early abort
 718                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jqXHR, s ) === false || state === 2 ) ) {
 719                                 // Abort if not done already
 720                                 jqXHR.abort();
 721                                 return false;
 722
 723                 }
 724
 725                 // Install callbacks on deferreds
 726                 for ( i in { success: 1, error: 1, complete: 1 } ) {
 727                         jqXHR[ i ]( s[ i ] );
 728                 }
 729
 730                 // Get transport
 731                 transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );
 732
 733                 // If no transport, we auto-abort
 734                 if ( !transport ) {
 735                         done( -1, "No Transport" );
 736                 } else {
 737                         jqXHR.readyState = 1;
 738                         // Send global event
 739                         if ( fireGlobals ) {
 740                                 globalEventContext.trigger( "ajaxSend", [ jqXHR, s ] );
 741                         }
 742                         // Timeout
 743                         if ( s.async && s.timeout > 0 ) {
 744                                 timeoutTimer = setTimeout( function(){
 745                                         jqXHR.abort( "timeout" );
 746                                 }, s.timeout );
 747                         }
 748
 749                         try {
 750                                 state = 1;
 751                                 transport.send( requestHeaders, done );
 752                         } catch (e) {
 753                                 // Propagate exception as error if not done
 754                                 if ( state < 2 ) {
 755                                         done( -1, e );
 756                                 // Simply rethrow otherwise
 757                                 } else {
 758                                         jQuery.error( e );
 759                                 }
 760                         }
 761                 }
 762
 763                 return jqXHR;
 764         },
 765
 766         // Serialize an array of form elements or a set of
 767         // key/values into a query string
 768         param: function( a, traditional ) {
 769                 var s = [],
 770                         add = function( key, value ) {
 771                                 // If value is a function, invoke it and return its value
 772                                 value = jQuery.isFunction( value ) ? value() : value;
 773                                 s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
 774                         };
 775
 776                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 777                 if ( traditional === undefined ) {
 778                         traditional = jQuery.ajaxSettings.traditional;
 779                 }
 780
 781                 // If an array was passed in, assume that it is an array of form elements.
 782                 if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
 783                         // Serialize the form elements
 784                         jQuery.each( a, function() {
 785                                 add( this.name, this.value );
 786                         });
 787
 788                 } else {
 789                         // If traditional, encode the "old" way (the way 1.3.2 or older
 790                         // did it), otherwise encode params recursively.
 791                         for ( var prefix in a ) {
 792                                 buildParams( prefix, a[ prefix ], traditional, add );
 793                         }
 794                 }
 795
 796                 // Return the resulting serialization
 797                 return s.join( "&" ).replace( r20, "+" );
 798         }
 799 });
 800
 801 function buildParams( prefix, obj, traditional, add ) {
 802         if ( jQuery.isArray( obj ) ) {
 803                 // Serialize array item.
 804                 jQuery.each( obj, function( i, v ) {
 805                         if ( traditional || rbracket.test( prefix ) ) {
 806                                 // Treat each array item as a scalar.
 807                                 add( prefix, v );
 808
 809                         } else {
 810                                 // If array item is non-scalar (array or object), encode its
 811                                 // numeric index to resolve deserialization ambiguity issues.
 812                                 // Note that rack (as of 1.0.0) can't currently deserialize
 813                                 // nested arrays properly, and attempting to do so may cause
 814                                 // a server error. Possible fixes are to modify rack's
 815                                 // deserialization algorithm or to provide an option or flag
 816                                 // to force array serialization to be shallow.
 817                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 818                         }
 819                 });
 820
 821         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 822                 // Serialize object item.
 823                 for ( var name in obj ) {
 824                         buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
 825                 }
 826
 827         } else {
 828                 // Serialize scalar item.
 829                 add( prefix, obj );
 830         }
 831 }
 832
 833 // This is still on the jQuery object... for now
 834 // Want to move this to jQuery.ajax some day
 835 jQuery.extend({
 836
 837         // Counter for holding the number of active queries
 838         active: 0,
 839
 840         // Last-Modified header cache for next request
 841         lastModified: {},
 842         etag: {}
 843
 844 });
 845
 846 /* Handles responses to an ajax request:
 847  * - sets all responseXXX fields accordingly
 848  * - finds the right dataType (mediates between content-type and expected dataType)
 849  * - returns the corresponding response
 850  */
 851 function ajaxHandleResponses( s, jqXHR, responses ) {
 852
 853         var contents = s.contents,
 854                 dataTypes = s.dataTypes,
 855                 responseFields = s.responseFields,
 856                 ct,
 857                 type,
 858                 finalDataType,
 859                 firstDataType;
 860
 861         // Fill responseXXX fields
 862         for ( type in responseFields ) {
 863                 if ( type in responses ) {
 864                         jqXHR[ responseFields[type] ] = responses[ type ];
 865                 }
 866         }
 867
 868         // Remove auto dataType and get content-type in the process
 869         while( dataTypes[ 0 ] === "*" ) {
 870                 dataTypes.shift();
 871                 if ( ct === undefined ) {
 872                         ct = s.mimeType || jqXHR.getResponseHeader( "content-type" );
 873                 }
 874         }
 875
 876         // Check if we're dealing with a known content-type
 877         if ( ct ) {
 878                 for ( type in contents ) {
 879                         if ( contents[ type ] && contents[ type ].test( ct ) ) {
 880                                 dataTypes.unshift( type );
 881                                 break;
 882                         }
 883                 }
 884         }
 885
 886         // Check to see if we have a response for the expected dataType
 887         if ( dataTypes[ 0 ] in responses ) {
 888                 finalDataType = dataTypes[ 0 ];
 889         } else {
 890                 // Try convertible dataTypes
 891                 for ( type in responses ) {
 892                         if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
 893                                 finalDataType = type;
 894                                 break;
 895                         }
 896                         if ( !firstDataType ) {
 897                                 firstDataType = type;
 898                         }
 899                 }
 900                 // Or just use first one
 901                 finalDataType = finalDataType || firstDataType;
 902         }
 903
 904         // If we found a dataType
 905         // We add the dataType to the list if needed
 906         // and return the corresponding response
 907         if ( finalDataType ) {
 908                 if ( finalDataType !== dataTypes[ 0 ] ) {
 909                         dataTypes.unshift( finalDataType );
 910                 }
 911                 return responses[ finalDataType ];
 912         }
 913 }
 914
 915 // Chain conversions given the request and the original response
 916 function ajaxConvert( s, response ) {
 917
 918         // Apply the dataFilter if provided
 919         if ( s.dataFilter ) {
 920                 response = s.dataFilter( response, s.dataType );
 921         }
 922
 923         var dataTypes = s.dataTypes,
 924                 converters = {},
 925                 i,
 926                 key,
 927                 length = dataTypes.length,
 928                 tmp,
 929                 // Current and previous dataTypes
 930                 current = dataTypes[ 0 ],
 931                 prev,
 932                 // Conversion expression
 933                 conversion,
 934                 // Conversion function
 935                 conv,
 936                 // Conversion functions (transitive conversion)
 937                 conv1,
 938                 conv2;
 939
 940         // For each dataType in the chain
 941         for ( i = 1; i < length; i++ ) {
 942
 943                 // Create converters map
 944                 // with lowercased keys
 945                 if ( i === 1 ) {
 946                         for ( key in s.converters ) {
 947                                 if ( typeof key === "string" ) {
 948                                         converters[ key.toLowerCase() ] = s.converters[ key ];
 949                                 }
 950                         }
 951                 }
 952
 953                 // Get the dataTypes
 954                 prev = current;
 955                 current = dataTypes[ i ];
 956
 957                 // If current is auto dataType, update it to prev
 958                 if ( current === "*" ) {
 959                         current = prev;
 960                 // If no auto and dataTypes are actually different
 961                 } else if ( prev !== "*" && prev !== current ) {
 962
 963                         // Get the converter
 964                         conversion = prev + " " + current;
 965                         conv = converters[ conversion ] || converters[ "* " + current ];
 966
 967                         // If there is no direct converter, search transitively
 968                         if ( !conv ) {
 969                                 conv2 = undefined;
 970                                 for ( conv1 in converters ) {
 971                                         tmp = conv1.split( " " );
 972                                         if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
 973                                                 conv2 = converters[ tmp[1] + " " + current ];
 974                                                 if ( conv2 ) {
 975                                                         conv1 = converters[ conv1 ];
 976                                                         if ( conv1 === true ) {
 977                                                                 conv = conv2;
 978                                                         } else if ( conv2 === true ) {
 979                                                                 conv = conv1;
 980                                                         }
 981                                                         break;
 982                                                 }
 983                                         }
 984                                 }
 985                         }
 986                         // If we found no converter, dispatch an error
 987                         if ( !( conv || conv2 ) ) {
 988                                 jQuery.error( "No conversion from " + conversion.replace(" "," to ") );
 989                         }
 990                         // If found converter is not an equivalence
 991                         if ( conv !== true ) {
 992                                 // Convert with 1 or 2 converters accordingly
 993                                 response = conv ? conv( response ) : conv2( conv1(response) );
 994                         }
 995                 }
 996         }
 997         return response;
 998 }
 999
1000 })( jQuery );