src/ajax.js

   1 (function( jQuery ) {
   2
   3 var r20 = /%20/g,
   4         rbracket = /\[\]$/,
   5         rhash = /#.*$/,
   6         rheaders = /^(.*?):\s*(.*?)\r?$/mg, // IE leaves an \r character at EOL
   7         rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
   8         rnoContent = /^(?:GET|HEAD)$/,
   9         rquery = /\?/,
  10         rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
  11         rselectTextarea = /^(?:select|textarea)/i,
  12         rts = /([?&])_=[^&]*/,
  13         rurl = /^(\w+:)?\/\/([^\/?#:]+)(?::(\d+))?/,
  14         rCRLF = /\r?\n/g,
  15
  16         // Slice function
  17         sliceFunc = Array.prototype.slice,
  18
  19         // Keep a copy of the old load method
  20         _load = jQuery.fn.load;
  21
  22 jQuery.fn.extend({
  23         load: function( url, params, callback ) {
  24                 if ( typeof url !== "string" && _load ) {
  25                         return _load.apply( this, arguments );
  26
  27                 // Don't do a request if no elements are being requested
  28                 } else if ( !this.length ) {
  29                         return this;
  30                 }
  31
  32                 var off = url.indexOf(" ");
  33                 if ( off >= 0 ) {
  34                         var selector = url.slice(off, url.length);
  35                         url = url.slice(0, off);
  36                 }
  37
  38                 // Default to a GET request
  39                 var type = "GET";
  40
  41                 // If the second parameter was provided
  42                 if ( params ) {
  43                         // If it's a function
  44                         if ( jQuery.isFunction( params ) ) {
  45                                 // We assume that it's the callback
  46                                 callback = params;
  47                                 params = null;
  48
  49                         // Otherwise, build a param string
  50                         } else if ( typeof params === "object" ) {
  51                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
  52                                 type = "POST";
  53                         }
  54                 }
  55
  56                 var self = this;
  57
  58                 // Request the remote document
  59                 jQuery.ajax({
  60                         url: url,
  61                         type: type,
  62                         dataType: "html",
  63                         data: params,
  64                         // Complete callback (responseText is used internally)
  65                         complete: function( jXHR, status, responseText ) {
  66                                 // Store the response as specified by the jXHR object
  67                                 responseText = jXHR.responseText;
  68                                 // If successful, inject the HTML into all the matched elements
  69                                 if ( jXHR.isResolved() ) {
  70                                         // #4825: Get the actual response in case
  71                                         // a dataFilter is present in ajaxSettings
  72                                         jXHR.done(function( r ) {
  73                                                 responseText = r;
  74                                         });
  75                                         // See if a selector was specified
  76                                         self.html( selector ?
  77                                                 // Create a dummy div to hold the results
  78                                                 jQuery("<div>")
  79                                                         // inject the contents of the document in, removing the scripts
  80                                                         // to avoid any 'Permission Denied' errors in IE
  81                                                         .append(responseText.replace(rscript, ""))
  82
  83                                                         // Locate the specified elements
  84                                                         .find(selector) :
  85
  86                                                 // If not, just inject the full result
  87                                                 responseText );
  88                                 }
  89
  90                                 if ( callback ) {
  91                                         self.each( callback, [responseText, status, jXHR] );
  92                                 }
  93                         }
  94                 });
  95
  96                 return this;
  97         },
  98
  99         serialize: function() {
 100                 return jQuery.param(this.serializeArray());
 101         },
 102
 103         serializeArray: function() {
 104                 return this.map(function(){
 105                         return this.elements ? jQuery.makeArray(this.elements) : this;
 106                 })
 107                 .filter(function(){
 108                         return this.name && !this.disabled &&
 109                                 (this.checked || rselectTextarea.test(this.nodeName) ||
 110                                         rinput.test(this.type));
 111                 })
 112                 .map(function(i, elem){
 113                         var val = jQuery(this).val();
 114
 115                         return val == null ?
 116                                 null :
 117                                 jQuery.isArray(val) ?
 118                                         jQuery.map( val, function(val, i){
 119                                                 return { name: elem.name, value: val.replace(rCRLF, "\r\n") };
 120                                         }) :
 121                                         { name: elem.name, value: val.replace(rCRLF, "\r\n") };
 122                 }).get();
 123         }
 124 });
 125
 126 // Attach a bunch of functions for handling common AJAX events
 127 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function(i,o){
 128         jQuery.fn[o] = function(f){
 129                 return this.bind(o, f);
 130         };
 131 });
 132
 133 jQuery.each( [ "get", "post" ], function( i, method ) {
 134         jQuery[ method ] = function( url, data, callback, type ) {
 135                 // shift arguments if data argument was omited
 136                 if ( jQuery.isFunction( data ) ) {
 137                         type = type || callback;
 138                         callback = data;
 139                         data = null;
 140                 }
 141
 142                 return jQuery.ajax({
 143                         type: method,
 144                         url: url,
 145                         data: data,
 146                         success: callback,
 147                         dataType: type
 148                 });
 149         };
 150 });
 151
 152 jQuery.extend({
 153
 154         getScript: function( url, callback ) {
 155                 return jQuery.get(url, null, callback, "script");
 156         },
 157
 158         getJSON: function( url, data, callback ) {
 159                 return jQuery.get(url, data, callback, "json");
 160         },
 161
 162         ajaxSetup: function( settings ) {
 163                 jQuery.extend( true, jQuery.ajaxSettings, settings );
 164                 if ( settings.context ) {
 165                         jQuery.ajaxSettings.context = settings.context;
 166                 }
 167         },
 168
 169         ajaxSettings: {
 170                 url: location.href,
 171                 global: true,
 172                 type: "GET",
 173                 contentType: "application/x-www-form-urlencoded",
 174                 processData: true,
 175                 async: true,
 176                 /*
 177                 timeout: 0,
 178                 data: null,
 179                 dataType: null,
 180                 username: null,
 181                 password: null,
 182                 cache: null,
 183                 traditional: false,
 184                 headers: {},
 185                 crossDomain: null,
 186                 */
 187
 188                 accepts: {
 189                         xml: "application/xml, text/xml",
 190                         html: "text/html",
 191                         text: "text/plain",
 192                         json: "application/json, text/javascript",
 193                         "*": "*/*"
 194                 },
 195
 196                 contents: {
 197                         xml: /xml/,
 198                         html: /html/,
 199                         json: /json/
 200                 },
 201
 202                 // Prefilters
 203                 // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
 204                 // 2) These are called:
 205                 //    * BEFORE asking for a transport
 206                 //    * AFTER param serialization (s.data is a string if s.processData is true)
 207                 // 3) key is the dataType
 208                 // 4) the catchall symbol "*" can be used
 209                 // 5) execution will start with transport dataType and THEN continue down to "*" if needed
 210                 prefilters: {},
 211
 212                 // Transports bindings
 213                 // 1) key is the dataType
 214                 // 2) the catchall symbol "*" can be used
 215                 // 3) selection will start with transport dataType and THEN go to "*" if needed
 216                 transports: {},
 217
 218                 // List of data converters
 219                 // 1) key format is "source_type destination_type" (a single space in-between)
 220                 // 2) the catchall symbol "*" can be used for source_type
 221                 converters: {
 222
 223                         // Convert anything to text
 224                         "* text": window.String,
 225
 226                         // Text to html (true = no transformation)
 227                         "text html": true,
 228
 229                         // Evaluate text as a json expression
 230                         "text json": jQuery.parseJSON,
 231
 232                         // Parse text as xml
 233                         "text xml": jQuery.parseXML
 234                 },
 235
 236                 // Utility function that handles dataType when response is received
 237                 // (for those transports that can give text or xml responses)
 238                 determineDataType: function( ct , text , xml ) {
 239
 240                         var s = this,
 241                                 contents = s.contents,
 242                                 type,
 243                                 regexp,
 244                                 dataTypes = s.dataTypes,
 245                                 transportDataType = dataTypes[0],
 246                                 response;
 247
 248                         // Auto (xml, json, script or text determined given headers)
 249                         if ( transportDataType === "*" ) {
 250
 251                                 for ( type in contents ) {
 252                                         if ( ( regexp = contents[ type ] ) && regexp.test( ct ) ) {
 253                                                 transportDataType = dataTypes[0] = type;
 254                                                 break;
 255                                         }
 256                                 }
 257                         }
 258
 259                         // xml and parsed as such
 260                         if ( transportDataType === "xml" &&
 261                                 xml &&
 262                                 xml.documentElement /* #4958 */ ) {
 263
 264                                 response = xml;
 265
 266                         // Text response was provided
 267                         } else {
 268
 269                                 response = text;
 270
 271                                 // If it's not really text, defer to converters
 272                                 if ( transportDataType !== "text" ) {
 273                                         dataTypes.unshift( "text" );
 274                                 }
 275
 276                         }
 277
 278                         return response;
 279                 }
 280
 281         },
 282
 283         ajaxPrefilter: function( a , b ) {
 284                 ajaxPrefilterOrTransport( "prefilters" , a , b );
 285         },
 286
 287         ajaxTransport: function( a , b ) {
 288                 return ajaxPrefilterOrTransport( "transports" , a , b );
 289         },
 290
 291         // Main method
 292         ajax: function( url , options ) {
 293
 294                 // If options is not an object,
 295                 // we simulate pre-1.5 signature
 296                 if ( typeof( options ) !== "object" ) {
 297                         options = url;
 298                         url = undefined;
 299                 }
 300
 301                 // Force options to be an object
 302                 options = options || {};
 303
 304                 var // Create the final options object
 305                         s = jQuery.extend( true , {} , jQuery.ajaxSettings , options ),
 306                         // jQuery lists
 307                         jQuery_lastModified = jQuery.lastModified,
 308                         jQuery_etag = jQuery.etag,
 309                         // Callbacks contexts
 310                         // We force the original context if it exists
 311                         // or take it from jQuery.ajaxSettings otherwise
 312                         // (plain objects used as context get extended)
 313                         callbackContext =
 314                                 ( s.context = ( "context" in options ? options : jQuery.ajaxSettings ).context ) || s,
 315                         globalEventContext = callbackContext === s ? jQuery.event : jQuery( callbackContext ),
 316                         // Deferreds
 317                         deferred = jQuery.Deferred(),
 318                         completeDeferred = jQuery._Deferred(),
 319                         // Status-dependent callbacks
 320                         statusCode = s.statusCode || {},
 321                         // Headers (they are sent all at once)
 322                         requestHeaders = {},
 323                         // Response headers
 324                         responseHeadersString,
 325                         responseHeaders,
 326                         // transport
 327                         transport,
 328                         // timeout handle
 329                         timeoutTimer,
 330                         // Cross-domain detection vars
 331                         loc = document.location,
 332                         protocol = loc.protocol || "http:",
 333                         parts,
 334                         // The jXHR state
 335                         state = 0,
 336                         // Loop variable
 337                         i,
 338                         // Fake xhr
 339                         jXHR = {
 340
 341                                 readyState: 0,
 342
 343                                 // Caches the header
 344                                 setRequestHeader: function(name,value) {
 345                                         if ( state === 0 ) {
 346                                                 requestHeaders[ name.toLowerCase() ] = value;
 347                                         }
 348                                         return this;
 349                                 },
 350
 351                                 // Raw string
 352                                 getAllResponseHeaders: function() {
 353                                         return state === 2 ? responseHeadersString : null;
 354                                 },
 355
 356                                 // Builds headers hashtable if needed
 357                                 getResponseHeader: function( key ) {
 358
 359                                         var match;
 360
 361                                         if ( state === 2 ) {
 362
 363                                                 if ( !responseHeaders ) {
 364
 365                                                         responseHeaders = {};
 366
 367                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 368                                                                 responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
 369                                                         }
 370                                                 }
 371                                                 match = responseHeaders[ key.toLowerCase() ];
 372
 373                                         }
 374
 375                                         return match || null;
 376                                 },
 377
 378                                 // Cancel the request
 379                                 abort: function( statusText ) {
 380                                         if ( transport ) {
 381                                                 transport.abort( statusText || "abort" );
 382                                         }
 383                                         done( 0 , statusText );
 384                                         return this;
 385                                 }
 386                         };
 387
 388                 // Callback for when everything is done
 389                 // It is defined here because jslint complains if it is declared
 390                 // at the end of the function (which would be more logical and readable)
 391                 function done( status , statusText , response , headers) {
 392
 393                         // Called once
 394                         if ( state === 2 ) {
 395                                 return;
 396                         }
 397
 398                         // State is "done" now
 399                         state = 2;
 400
 401                         // Dereference transport for early garbage collection
 402                         // (no matter how long the jXHR transport will be used
 403                         transport = undefined;
 404
 405                         // Set readyState
 406                         jXHR.readyState = status ? 4 : 0;
 407
 408                         // Cache response headers
 409                         responseHeadersString = headers || "";
 410
 411                         // Clear timeout if it exists
 412                         if ( timeoutTimer ) {
 413                                 clearTimeout(timeoutTimer);
 414                         }
 415
 416                         var // Reference url
 417                                 url = s.url,
 418                                 // and ifModified status
 419                                 ifModified = s.ifModified,
 420
 421                                 // Is it a success?
 422                                 isSuccess = 0,
 423                                 // Stored success
 424                                 success,
 425                                 // Stored error
 426                                 error,
 427
 428                                 // To keep track of statusCode based callbacks
 429                                 oldStatusCode;
 430
 431                         // If successful, handle type chaining
 432                         if ( status >= 200 && status < 300 || status === 304 ) {
 433
 434                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 435                                 if ( s.ifModified ) {
 436
 437                                         var lastModified = jXHR.getResponseHeader("Last-Modified"),
 438                                                 etag = jXHR.getResponseHeader("Etag");
 439
 440                                         if (lastModified) {
 441                                                 jQuery_lastModified[ s.url ] = lastModified;
 442                                         }
 443                                         if (etag) {
 444                                                 jQuery_etag[ s.url ] = etag;
 445                                         }
 446                                 }
 447
 448                                 // If not modified
 449                                 if ( status === 304 ) {
 450
 451                                         // Set the statusText accordingly
 452                                         statusText = "notmodified";
 453                                         // Mark as a success
 454                                         isSuccess = 1;
 455
 456                                 // If we have data
 457                                 } else {
 458
 459                                         // Set the statusText accordingly
 460                                         statusText = "success";
 461
 462                                         // Chain data conversions and determine the final value
 463                                         // (if an exception is thrown in the process, it'll be notified as an error)
 464                                         try {
 465
 466                                                 var i,
 467                                                         // Current dataType
 468                                                         current,
 469                                                         // Previous dataType
 470                                                         prev,
 471                                                         // Conversion expression
 472                                                         conversion,
 473                                                         // Conversion function
 474                                                         conv,
 475                                                         // Conversion functions (when text is used in-between)
 476                                                         conv1,
 477                                                         conv2,
 478                                                         // Local references to dataTypes & converters
 479                                                         dataTypes = s.dataTypes,
 480                                                         converters = s.converters,
 481                                                         // DataType to responseXXX field mapping
 482                                                         responses = {
 483                                                                 "xml": "XML",
 484                                                                 "text": "Text"
 485                                                         };
 486
 487                                                 // For each dataType in the chain
 488                                                 for( i = 0 ; i < dataTypes.length ; i++ ) {
 489
 490                                                         current = dataTypes[ i ];
 491
 492                                                         // If a responseXXX field for this dataType exists
 493                                                         // and if it hasn't been set yet
 494                                                         if ( responses[ current ] ) {
 495                                                                 // Set it
 496                                                                 jXHR[ "response" + responses[ current ] ] = response;
 497                                                                 // Mark it as set
 498                                                                 responses[ current ] = 0;
 499                                                         }
 500
 501                                                         // If this is not the first element
 502                                                         if ( i ) {
 503
 504                                                                 // Get the dataType to convert from
 505                                                                 prev = dataTypes[ i - 1 ];
 506
 507                                                                 // If no catch-all and dataTypes are actually different
 508                                                                 if ( prev !== "*" && current !== "*" && prev !== current ) {
 509
 510                                                                         // Get the converter
 511                                                                         conversion = prev + " " + current;
 512                                                                         conv = converters[ conversion ] || converters[ "* " + current ];
 513
 514                                                                         conv1 = conv2 = 0;
 515
 516                                                                         // If there is no direct converter and none of the dataTypes is text
 517                                                                         if ( ! conv && prev !== "text" && current !== "text" ) {
 518                                                                                 // Try with text in-between
 519                                                                                 conv1 = converters[ prev + " text" ] || converters[ "* text" ];
 520                                                                                 conv2 = converters[ "text " + current ];
 521                                                                                 // Revert back to a single converter
 522                                                                                 // if one of the converter is an equivalence
 523                                                                                 if ( conv1 === true ) {
 524                                                                                         conv = conv2;
 525                                                                                 } else if ( conv2 === true ) {
 526                                                                                         conv = conv1;
 527                                                                                 }
 528                                                                         }
 529                                                                         // If we found no converter, dispatch an error
 530                                                                         if ( ! ( conv || conv1 && conv2 ) ) {
 531                                                                                 throw conversion;
 532                                                                         }
 533                                                                         // If found converter is not an equivalence
 534                                                                         if ( conv !== true ) {
 535                                                                                 // Convert with 1 or 2 converters accordingly
 536                                                                                 response = conv ? conv( response ) : conv2( conv1( response ) );
 537                                                                         }
 538                                                                 }
 539                                                         // If it is the first element of the chain
 540                                                         // and we have a dataFilter
 541                                                         } else if ( s.dataFilter ) {
 542                                                                 // Apply the dataFilter
 543                                                                 response = s.dataFilter( response , current );
 544                                                                 // Get dataTypes again in case the filter changed them
 545                                                                 dataTypes = s.dataTypes;
 546                                                         }
 547                                                 }
 548                                                 // End of loop
 549
 550                                                 // We have a real success
 551                                                 success = response;
 552                                                 isSuccess = 1;
 553
 554                                         // If an exception was thrown
 555                                         } catch(e) {
 556
 557                                                 // We have a parsererror
 558                                                 statusText = "parsererror";
 559                                                 error = "" + e;
 560
 561                                         }
 562                                 }
 563
 564                         // if not success, mark it as an error
 565                         } else {
 566
 567                                         error = statusText = statusText || "error";
 568
 569                                         // Set responseText if needed
 570                                         if ( response ) {
 571                                                 jXHR.responseText = response;
 572                                         }
 573                         }
 574
 575                         // Set data for the fake xhr object
 576                         jXHR.status = status;
 577                         jXHR.statusText = statusText;
 578
 579                         // Success/Error
 580                         if ( isSuccess ) {
 581                                 deferred.fire( callbackContext , [ success , statusText , jXHR ] );
 582                         } else {
 583                                 deferred.fireReject( callbackContext , [ jXHR , statusText , error ] );
 584                         }
 585
 586                         // Status-dependent callbacks
 587                         oldStatusCode = statusCode;
 588                         statusCode = undefined;
 589                         jXHR.statusCode( oldStatusCode );
 590
 591                         if ( s.global ) {
 592                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
 593                                                 [ jXHR , s , isSuccess ? success : error ] );
 594                         }
 595
 596                         // Complete
 597                         completeDeferred.fire( callbackContext, [ jXHR , statusText ] );
 598
 599                         if ( s.global ) {
 600                                 globalEventContext.trigger( "ajaxComplete" , [ jXHR , s] );
 601                                 // Handle the global AJAX counter
 602                                 if ( ! --jQuery.active ) {
 603                                         jQuery.event.trigger( "ajaxStop" );
 604                                 }
 605                         }
 606                 }
 607
 608                 // Attach deferreds
 609                 deferred.promise( jXHR );
 610                 jXHR.success = jXHR.done;
 611                 jXHR.error = jXHR.fail;
 612                 jXHR.complete = completeDeferred.done;
 613
 614                 // Status-dependent callbacks
 615                 jXHR.statusCode = function( map ) {
 616                         if ( map ) {
 617                                 var tmp;
 618                                 if ( statusCode ) {
 619                                         for( tmp in map ) {
 620                                                 statusCode[ tmp ] = [ statusCode[ tmp ] , map[ tmp ] ];
 621                                         }
 622                                 } else {
 623                                         tmp = map[ jXHR.status ];
 624                                         jXHR.done( tmp ).fail( tmp );
 625                                 }
 626                         }
 627                         return this;
 628                 };
 629
 630                 // Remove hash character (#7531: and string promotion)
 631                 // We also use the url parameter if available
 632                 s.url = ( "" + ( url || s.url ) ).replace( rhash , "" );
 633
 634                 // Extract dataTypes list
 635                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
 636
 637                 // Determine if a cross-domain request is in order
 638                 if ( ! s.crossDomain ) {
 639                         parts = rurl.exec( s.url.toLowerCase() );
 640                         s.crossDomain = !!(
 641                                         parts &&
 642                                         ( parts[ 1 ] && parts[ 1 ] != protocol ||
 643                                                 parts[ 2 ] != loc.hostname ||
 644                                                 ( parts[ 3 ] || ( ( parts[ 1 ] || protocol ) === "http:" ? 80 : 443 ) ) !=
 645                                                         ( loc.port || ( protocol === "http:" ? 80 : 443 ) ) )
 646                         );
 647                 }
 648
 649                 // Convert data if not already a string
 650                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 651                         s.data = jQuery.param( s.data , s.traditional );
 652                 }
 653
 654                 // Apply prefilters
 655                 jQuery.ajaxPrefilter( s , options );
 656
 657                 // Uppercase the type
 658                 s.type = s.type.toUpperCase();
 659
 660                 // Determine if request has content
 661                 s.hasContent = ! rnoContent.test( s.type );
 662
 663                 // Watch for a new set of requests
 664                 if ( s.global && jQuery.active++ === 0 ) {
 665                         jQuery.event.trigger( "ajaxStart" );
 666                 }
 667
 668                 // More options handling for requests with no content
 669                 if ( ! s.hasContent ) {
 670
 671                         // If data is available, append data to url
 672                         if ( s.data ) {
 673                                 s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 674                         }
 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                         requestHeaders[ "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                         if ( jQuery_lastModified[ s.url ] ) {
 696                                 requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
 697                         }
 698                         if ( jQuery_etag[ s.url ] ) {
 699                                 requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
 700                         }
 701                 }
 702
 703                 // Set the Accepts header for the server, depending on the dataType
 704                 requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
 705                         s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 706                         s.accepts[ "*" ];
 707
 708                 // Check for headers option
 709                 for ( i in s.headers ) {
 710                         requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
 711                 }
 712
 713                 // Allow custom headers/mimetypes and early abort
 714                 if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
 715
 716                                 // Abort if not done already
 717                                 done( 0 , "abort" );
 718
 719                                 // Return false
 720                                 jXHR = false;
 721
 722                 } else {
 723
 724                         // Install callbacks on deferreds
 725                         for ( i in { success:1, error:1, complete:1 } ) {
 726                                 jXHR[ i ]( s[ i ] );
 727                         }
 728
 729                         // Get transport
 730                         transport = jQuery.ajaxTransport( s , options );
 731
 732                         // If no transport, we auto-abort
 733                         if ( ! transport ) {
 734
 735                                 done( 0 , "notransport" );
 736
 737                         } else {
 738
 739                                 // Set state as sending
 740                                 state = jXHR.readyState = 1;
 741
 742                                 // Send global event
 743                                 if ( s.global ) {
 744                                         globalEventContext.trigger( "ajaxSend" , [ jXHR , s ] );
 745                                 }
 746
 747                                 // Timeout
 748                                 if ( s.async && s.timeout > 0 ) {
 749                                         timeoutTimer = setTimeout(function(){
 750                                                 jXHR.abort( "timeout" );
 751                                         }, s.timeout);
 752                                 }
 753
 754                                 // Try to send
 755                                 try {
 756                                         transport.send(requestHeaders, done);
 757                                 } catch (e) {
 758                                         // Propagate exception as error if not done
 759                                         if ( status === 1 ) {
 760
 761                                                 done(0, "error", "" + e);
 762                                                 jXHR = false;
 763
 764                                         // Simply rethrow otherwise
 765                                         } else {
 766                                                 jQuery.error(e);
 767                                         }
 768                                 }
 769                         }
 770                 }
 771
 772                 return jXHR;
 773         },
 774
 775         // Serialize an array of form elements or a set of
 776         // key/values into a query string
 777         param: function( a, traditional ) {
 778                 var s = [],
 779                         add = function( key, value ) {
 780                                 // If value is a function, invoke it and return its value
 781                                 value = jQuery.isFunction(value) ? value() : value;
 782                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 783                         };
 784
 785                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 786                 if ( traditional === undefined ) {
 787                         traditional = jQuery.ajaxSettings.traditional;
 788                 }
 789
 790                 // If an array was passed in, assume that it is an array of form elements.
 791                 if ( jQuery.isArray(a) || a.jquery ) {
 792                         // Serialize the form elements
 793                         jQuery.each( a, function() {
 794                                 add( this.name, this.value );
 795                         });
 796
 797                 } else {
 798                         // If traditional, encode the "old" way (the way 1.3.2 or older
 799                         // did it), otherwise encode params recursively.
 800                         for ( var prefix in a ) {
 801                                 buildParams( prefix, a[prefix], traditional, add );
 802                         }
 803                 }
 804
 805                 // Return the resulting serialization
 806                 return s.join("&").replace(r20, "+");
 807         }
 808 });
 809
 810 function buildParams( prefix, obj, traditional, add ) {
 811         if ( jQuery.isArray(obj) && obj.length ) {
 812                 // Serialize array item.
 813                 jQuery.each( obj, function( i, v ) {
 814                         if ( traditional || rbracket.test( prefix ) ) {
 815                                 // Treat each array item as a scalar.
 816                                 add( prefix, v );
 817
 818                         } else {
 819                                 // If array item is non-scalar (array or object), encode its
 820                                 // numeric index to resolve deserialization ambiguity issues.
 821                                 // Note that rack (as of 1.0.0) can't currently deserialize
 822                                 // nested arrays properly, and attempting to do so may cause
 823                                 // a server error. Possible fixes are to modify rack's
 824                                 // deserialization algorithm or to provide an option or flag
 825                                 // to force array serialization to be shallow.
 826                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 827                         }
 828                 });
 829
 830         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 831                 // If we see an array here, it is empty and should be treated as an empty
 832                 // object
 833                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 834                         add( prefix, "" );
 835
 836                 // Serialize object item.
 837                 } else {
 838                         jQuery.each( obj, function( k, v ) {
 839                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 840                         });
 841                 }
 842
 843         } else {
 844                 // Serialize scalar item.
 845                 add( prefix, obj );
 846         }
 847 }
 848
 849 // This is still on the jQuery object... for now
 850 // Want to move this to jQuery.ajax some day
 851 jQuery.extend({
 852
 853         // Counter for holding the number of active queries
 854         active: 0,
 855
 856         // Last-Modified header cache for next request
 857         lastModified: {},
 858         etag: {}
 859
 860 });
 861
 862 // Base function for both ajaxPrefilter and ajaxTransport
 863 function ajaxPrefilterOrTransport( arg0 , arg1 , arg2 ) {
 864
 865         var type = jQuery.type( arg1 ),
 866                 structure = jQuery.ajaxSettings[ arg0 ],
 867                 i,
 868                 length;
 869
 870         // We have an options map so we have to inspect the structure
 871         if ( type === "object" ) {
 872
 873                 var options = arg1,
 874                         originalOptions = arg2,
 875                         // When dealing with prefilters, we execute only
 876                         // (no selection so we never stop when a function
 877                         // returns a non-falsy, non-string value)
 878                         executeOnly = ( arg0 === "prefilters" ),
 879                         inspect = function( dataType, tested ) {
 880
 881                                 if ( ! tested[ dataType ] ) {
 882
 883                                         tested[ dataType ] = true;
 884
 885                                         var list = structure[ dataType ],
 886                                                 selected;
 887
 888                                         for( i = 0, length = list ? list.length : 0 ; ( executeOnly || ! selected ) && i < length ; i++ ) {
 889                                                 selected = list[ i ]( options , originalOptions );
 890                                                 // If we got redirected to a different dataType,
 891                                                 // we add it and switch to the corresponding list
 892                                                 if ( typeof( selected ) === "string" && selected !== dataType ) {
 893                                                         options.dataTypes.unshift( selected );
 894                                                         selected = inspect( selected , tested );
 895                                                         // We always break in order not to continue
 896                                                         // to iterate in previous list
 897                                                         break;
 898                                                 }
 899                                         }
 900                                         // If we're only executing or nothing was selected
 901                                         // we try the catchall dataType
 902                                         if ( executeOnly || ! selected ) {
 903                                                 selected = inspect( "*" , tested );
 904                                         }
 905                                         // This will be ignored by ajaxPrefilter
 906                                         // so it's safe to return no matter what
 907                                         return selected;
 908                                 }
 909
 910                         };
 911
 912                 // Start inspection with current transport dataType
 913                 return inspect( options.dataTypes[ 0 ] , {} );
 914
 915         } else {
 916
 917                 // We're requested to add to the structure
 918                 // Signature is ( dataTypeExpression , function )
 919                 // with dataTypeExpression being optional and
 920                 // defaulting to catchAll (*)
 921                 type = type === "function";
 922
 923                 if ( type ) {
 924                         arg2 = arg1;
 925                         arg1 = undefined;
 926                 }
 927                 arg1 = arg1 || "*";
 928
 929                 // We control that the second argument is really a function
 930                 if ( type || jQuery.isFunction( arg2 ) ) {
 931
 932                         var dataTypes = arg1.split( /\s+/ ),
 933                                 functor = arg2,
 934                                 dataType,
 935                                 list,
 936                                 placeBefore;
 937
 938                         // For each dataType in the dataTypeExpression
 939                         for( i = 0 , length = dataTypes.length ; i < length ; i++ ) {
 940                                 dataType = dataTypes[ i ];
 941                                 // We control if we're asked to add before
 942                                 // any existing element
 943                                 placeBefore = /^\+/.test( dataType );
 944                                 if ( placeBefore ) {
 945                                         dataType = dataType.substr( 1 );
 946                                 }
 947                                 list = structure[ dataType ] = structure[ dataType ] || [];
 948                                 // then we add to the structure accordingly
 949                                 list[ placeBefore ? "unshift" : "push" ]( functor );
 950                         }
 951                 }
 952         }
 953 }
 954
 955 })( jQuery );