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+:)?\/\/([^\/?#]+)/,
  14
  15         // Slice function
  16         sliceFunc = Array.prototype.slice,
  17
  18         // Keep a copy of the old load method
  19         _load = jQuery.fn.load;
  20
  21 jQuery.fn.extend({
  22         load: function( url, params, callback ) {
  23                 if ( typeof url !== "string" && _load ) {
  24                         return _load.apply( this, arguments );
  25
  26                 // Don't do a request if no elements are being requested
  27                 } else if ( !this.length ) {
  28                         return this;
  29                 }
  30
  31                 var off = url.indexOf(" ");
  32                 if ( off >= 0 ) {
  33                         var selector = url.slice(off, url.length);
  34                         url = url.slice(0, off);
  35                 }
  36
  37                 // Default to a GET request
  38                 var type = "GET";
  39
  40                 // If the second parameter was provided
  41                 if ( params ) {
  42                         // If it's a function
  43                         if ( jQuery.isFunction( params ) ) {
  44                                 // We assume that it's the callback
  45                                 callback = params;
  46                                 params = null;
  47
  48                         // Otherwise, build a param string
  49                         } else if ( typeof params === "object" ) {
  50                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
  51                                 type = "POST";
  52                         }
  53                 }
  54
  55                 var self = this;
  56
  57                 // Request the remote document
  58                 jQuery.ajax({
  59                         url: url,
  60                         type: type,
  61                         dataType: "html",
  62                         data: params,
  63                         complete: function( res, status ) {
  64                                 // If successful, inject the HTML into all the matched elements
  65                                 if ( status === "success" || status === "notmodified" ) {
  66                                         // See if a selector was specified
  67                                         self.html( selector ?
  68                                                 // Create a dummy div to hold the results
  69                                                 jQuery("<div>")
  70                                                         // inject the contents of the document in, removing the scripts
  71                                                         // to avoid any 'Permission Denied' errors in IE
  72                                                         .append(res.responseText.replace(rscript, ""))
  73
  74                                                         // Locate the specified elements
  75                                                         .find(selector) :
  76
  77                                                 // If not, just inject the full result
  78                                                 res.responseText );
  79                                 }
  80
  81                                 if ( callback ) {
  82                                         self.each( callback, [res.responseText, status, res] );
  83                                 }
  84                         }
  85                 });
  86
  87                 return this;
  88         },
  89
  90         serialize: function() {
  91                 return jQuery.param(this.serializeArray());
  92         },
  93
  94         serializeArray: function() {
  95                 return this.map(function(){
  96                         return this.elements ? jQuery.makeArray(this.elements) : this;
  97                 })
  98                 .filter(function(){
  99                         return this.name && !this.disabled &&
 100                                 (this.checked || rselectTextarea.test(this.nodeName) ||
 101                                         rinput.test(this.type));
 102                 })
 103                 .map(function(i, elem){
 104                         var val = jQuery(this).val();
 105
 106                         return val == null ?
 107                                 null :
 108                                 jQuery.isArray(val) ?
 109                                         jQuery.map( val, function(val, i){
 110                                                 return {name: elem.name, value: val};
 111                                         }) :
 112                                         {name: elem.name, value: val};
 113                 }).get();
 114         }
 115 });
 116
 117 // Attach a bunch of functions for handling common AJAX events
 118 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function(i,o){
 119         jQuery.fn[o] = function(f){
 120                 return this.bind(o, f);
 121         };
 122 });
 123
 124 jQuery.extend({
 125
 126         get: function( url, data, callback, type ) {
 127                 // shift arguments if data argument was omited
 128                 if ( jQuery.isFunction( data ) ) {
 129                         type = type || callback;
 130                         callback = data;
 131                         data = null;
 132                 }
 133
 134                 return jQuery.ajax({
 135                         type: "GET",
 136                         url: url,
 137                         data: data,
 138                         success: callback,
 139                         dataType: type
 140                 });
 141         },
 142
 143         getScript: function( url, callback ) {
 144                 return jQuery.get(url, null, callback, "script");
 145         },
 146
 147         getJSON: function( url, data, callback ) {
 148                 return jQuery.get(url, data, callback, "json");
 149         },
 150
 151         post: function( url, data, callback, type ) {
 152                 // shift arguments if data argument was omited
 153                 if ( jQuery.isFunction( data ) ) {
 154                         type = type || callback;
 155                         callback = data;
 156                         data = {};
 157                 }
 158
 159                 return jQuery.ajax({
 160                         type: "POST",
 161                         url: url,
 162                         data: data,
 163                         success: callback,
 164                         dataType: type
 165                 });
 166         },
 167
 168         ajaxSetup: function( settings ) {
 169                 jQuery.extend( jQuery.ajaxSettings, settings );
 170         },
 171
 172         ajaxSettings: {
 173                 url: location.href,
 174                 global: true,
 175                 type: "GET",
 176                 contentType: "application/x-www-form-urlencoded",
 177                 processData: true,
 178                 async: true,
 179                 /*
 180                 timeout: 0,
 181                 data: null,
 182                 dataType: null,
 183                 dataTypes: null,
 184                 username: null,
 185                 password: null,
 186                 cache: null,
 187                 traditional: false,
 188                 */
 189                 xhr: function() {
 190                         return new window.XMLHttpRequest();
 191                 },
 192
 193                 accepts: {
 194                         xml: "application/xml, text/xml",
 195                         html: "text/html",
 196                         text: "text/plain",
 197                         json: "application/json, text/javascript",
 198                         "*": "*/*"
 199                 },
 200
 201                 autoDataType: {
 202                         xml: /xml/,
 203                         html: /html/,
 204                         json: /json/
 205                 },
 206
 207                 // Prefilters
 208                 // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
 209                 // 2) These are called:
 210                 //    * BEFORE asking for a transport
 211                 //    * AFTER param serialization (s.data is a string if s.processData is true)
 212                 // 3) key is the dataType
 213                 // 4) the catchall symbol "*" can be used
 214                 // 5) execution will start with transport dataType and THEN continue down to "*" if needed
 215                 prefilters: {},
 216
 217                 // Transports bindings
 218                 // 1) key is the dataType
 219                 // 2) the catchall symbol "*" can be used
 220                 // 3) selection will start with transport dataType and THEN go to "*" if needed
 221                 transports: {},
 222
 223                 // List of data converters
 224                 // 1) key format is "source_type destination_type" (a single space in-between)
 225                 // 2) the catchall symbol "*" can be used for source_type
 226                 dataConverters: {
 227
 228                         // Convert anything to text
 229                         "* text": window.String,
 230
 231                         // Text to html (true = no transformation)
 232                         "text html": true,
 233
 234                         // Evaluate text as a json expression
 235                         "text json": jQuery.parseJSON,
 236
 237                         // Parse text as xml
 238                         "text xml": jQuery.parseXML
 239                 }
 240         },
 241
 242         // Main method
 243         // (s is used internally)
 244         ajax: function( url , options , s ) {
 245
 246                 // Handle varargs
 247                 if ( arguments.length === 1 ) {
 248                         options = url;
 249                         url = options ? options.url : undefined;
 250                 }
 251
 252                 // Force options to be an object
 253                 options = options || {};
 254
 255                 // Get the url if provided separately
 256                 options.url = url || options.url;
 257
 258                 // Create the final options object
 259                 s = jQuery.extend( true , {} , jQuery.ajaxSettings , options );
 260
 261                 // We force the original context
 262                 // (plain objects used as context get extended)
 263                 s.context = options.context;
 264
 265                 var // jQuery lists
 266                         jQuery_lastModified = jQuery.lastModified,
 267                         jQuery_etag = jQuery.etag,
 268                         // Callbacks contexts
 269                         callbackContext = s.context || s,
 270                         globalEventContext = s.context ? jQuery( s.context ) : jQuery.event,
 271                         // Deferreds
 272                         deferred = jQuery.Deferred(),
 273                         completeDeferred = jQuery._Deferred(),
 274                         // Headers (they are sent all at once)
 275                         requestHeaders = {},
 276                         // Response headers
 277                         responseHeadersString,
 278                         responseHeaders,
 279                         // transport
 280                         transport,
 281                         // timeout handle
 282                         timeoutTimer,
 283                         // The jXHR state
 284                         state = 0,
 285                         // Loop variable
 286                         i,
 287                         // Fake xhr
 288                         jXHR = {
 289
 290                                 readyState: 0,
 291
 292                                 // Caches the header
 293                                 setRequestHeader: function(name,value) {
 294                                         if ( state === 0 ) {
 295                                                 requestHeaders[ name.toLowerCase() ] = value;
 296                                         }
 297                                         return this;
 298                                 },
 299
 300                                 // Raw string
 301                                 getAllResponseHeaders: function() {
 302                                         return state === 2 ? responseHeadersString : null;
 303                                 },
 304
 305                                 // Builds headers hashtable if needed
 306                                 // (match is used internally)
 307                                 getResponseHeader: function( key , match ) {
 308
 309                                         if ( state !== 2 ) {
 310                                                 return null;
 311                                         }
 312
 313                                         if ( responseHeaders === undefined ) {
 314
 315                                                 responseHeaders = {};
 316
 317                                                 if ( typeof responseHeadersString === "string" ) {
 318
 319                                                         while( ( match = rheaders.exec( responseHeadersString ) ) ) {
 320                                                                 responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
 321                                                         }
 322                                                 }
 323                                         }
 324                                         return responseHeaders[ key.toLowerCase() ];
 325                                 },
 326
 327                                 // Cancel the request
 328                                 abort: function( statusText ) {
 329                                         if ( transport && state !== 2 ) {
 330                                                 transport.abort( statusText || "abort" );
 331                                                 done( 0 , statusText );
 332                                         }
 333                                         return this;
 334                                 }
 335                         };
 336
 337                 // Callback for when everything is done
 338                 // It is defined here because jslint complains if it is declared
 339                 // at the end of the function (which would be more logical and readable)
 340                 function done( status , statusText , response , headers) {
 341
 342                         // Called once
 343                         if ( state === 2 ) {
 344                                 return;
 345                         }
 346
 347                         // State is "done" now
 348                         state = 2;
 349
 350                         // Set readyState
 351                         jXHR.readyState = status ? 4 : 0;
 352
 353                         // Cache response headers
 354                         responseHeadersString = headers || "";
 355
 356                         // Clear timeout if it exists
 357                         if ( timeoutTimer ) {
 358                                 clearTimeout(timeoutTimer);
 359                         }
 360
 361                         var // Reference url
 362                                 url = s.url,
 363                                 // and ifModified status
 364                                 ifModified = s.ifModified,
 365
 366                                 // Is it a success?
 367                                 isSuccess = 0,
 368                                 // Stored success
 369                                 success,
 370                                 // Stored error
 371                                 error = statusText;
 372
 373                         // If not timeout, force a jQuery-compliant status text
 374                         if ( statusText != "timeout" ) {
 375                                 statusText = ( status >= 200 && status < 300 ) ?
 376                                         "success" :
 377                                         ( status === 304 ? "notmodified" : "error" );
 378                         }
 379
 380                         // If successful, handle type chaining
 381                         if ( statusText === "success" || statusText === "notmodified" ) {
 382
 383                                 // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 384                                 if ( s.ifModified ) {
 385
 386                                         var lastModified = jXHR.getResponseHeader("Last-Modified"),
 387                                                 etag = jXHR.getResponseHeader("Etag");
 388
 389                                         if (lastModified) {
 390                                                 jQuery_lastModified[ s.url ] = lastModified;
 391                                         }
 392                                         if (etag) {
 393                                                 jQuery_etag[ s.url ] = etag;
 394                                         }
 395                                 }
 396
 397                                 if ( s.ifModified && statusText === "notmodified" ) {
 398
 399                                         success = null;
 400                                         isSuccess = 1;
 401
 402                                 } else {
 403                                         // Chain data conversions and determine the final value
 404                                         // (if an exception is thrown in the process, it'll be notified as an error)
 405                                         try {
 406
 407                                                 var i,
 408                                                         current,
 409                                                         prev,
 410                                                         checker,
 411                                                         conv1,
 412                                                         conv2,
 413                                                         oneConv,
 414                                                         convertion,
 415                                                         dataTypes = s.dataTypes,
 416                                                         dataConverters = s.dataConverters,
 417                                                         responses = {
 418                                                                 "xml": "XML",
 419                                                                 "text": "Text"
 420                                                         };
 421
 422                                                 for( i = 0 ; i < dataTypes.length ; i++ ) {
 423
 424                                                         current = dataTypes[ i ];
 425
 426                                                         if ( responses[ current ] ) {
 427                                                                 jXHR[ "response" + responses[ current ] ] = response;
 428                                                                 responses[ current ] = 0;
 429                                                         }
 430
 431                                                         if ( i ) {
 432
 433                                                                 prev = dataTypes[ i - 1 ];
 434
 435                                                                 if ( prev !== "*" && current !== "*" && prev !== current ) {
 436
 437                                                                         oneConv = conv1 =
 438                                                                                 dataConverters[ ( conversion = prev + " " + current ) ] ||
 439                                                                                 dataConverters[ "* " + current ];
 440
 441                                                                         if ( oneConv !== true ) {
 442
 443                                                                                 if ( ! oneConv && prev !== "text" && current !== "text" ) {
 444                                                                                         conv1 = dataConverters[ prev + " text" ] || dataConverters[ "* text" ];
 445                                                                                         conv2 = dataConverters[ "text " + current ];
 446                                                                                 }
 447
 448                                                                                 if ( oneConv || conv1 && conv2 ) {
 449                                                                                         response = oneConv ? conv1( response ) : conv2( conv1( response ) );
 450                                                                                 } else {
 451                                                                                         throw "no " + conversion;
 452                                                                                 }
 453                                                                         }
 454                                                                 }
 455                                                         } else if ( s.dataFilter ) {
 456
 457                                                                 response = s.dataFilter( response );
 458                                                                 dataTypes = s.dataTypes;
 459                                                         }
 460                                                 }
 461
 462                                                 // We have a real success
 463                                                 success = response;
 464                                                 isSuccess = 1;
 465
 466                                         } catch(e) {
 467
 468                                                 statusText = "parsererror";
 469                                                 error = "" + e;
 470
 471                                         }
 472                                 }
 473
 474                         } else { // if not success, mark it as an error
 475
 476                                         error = error || statusText;
 477                         }
 478
 479                         // Set data for the fake xhr object
 480                         jXHR.status = status;
 481                         jXHR.statusText = statusText;
 482
 483                         // Success/Error
 484                         if ( isSuccess ) {
 485                                 deferred.fire( callbackContext , [ success , statusText , jXHR ] );
 486                         } else {
 487                                 deferred.fireReject( callbackContext , [ jXHR , statusText , error ] );
 488                         }
 489
 490                         if ( s.global ) {
 491                                 globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
 492                                                 [ jXHR , s , isSuccess ? success : error ] );
 493                         }
 494
 495                         // Complete
 496                         completeDeferred.fire( callbackContext, [ jXHR , statusText ] );
 497
 498                         if ( s.global ) {
 499                                 globalEventContext.trigger( "ajaxComplete" , [ jXHR , s] );
 500                                 // Handle the global AJAX counter
 501                                 if ( ! --jQuery.active ) {
 502                                         jQuery.event.trigger( "ajaxStop" );
 503                                 }
 504                         }
 505                 }
 506
 507                 // Attach deferreds
 508                 jXHR.success = jXHR.then = deferred.then;
 509                 jXHR.error = jXHR.fail = deferred.fail;
 510                 jXHR.complete = completeDeferred.then;
 511
 512                 // Remove hash character (#7531: and string promotion)
 513                 s.url = ( "" + s.url ).replace( rhash , "" );
 514
 515                 // Uppercase the type
 516                 s.type = s.type.toUpperCase();
 517
 518                 // Determine if request has content
 519                 s.hasContent = ! rnoContent.test( s.type );
 520
 521                 // Extract dataTypes list
 522                 s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
 523
 524                 // Determine if a cross-domain request is in order
 525                 var parts = rurl.exec( s.url.toLowerCase() ),
 526                         loc = location;
 527                 s.crossDomain = !!( parts && ( parts[ 1 ] && parts[ 1 ] != loc.protocol || parts[ 2 ] != loc.host ) );
 528
 529                 // Convert data if not already a string
 530                 if ( s.data && s.processData && typeof s.data != "string" ) {
 531                         s.data = jQuery.param( s.data , s.traditional );
 532                 }
 533
 534                 // Watch for a new set of requests
 535                 if ( s.global && jQuery.active++ === 0 ) {
 536                         jQuery.event.trigger( "ajaxStart" );
 537                 }
 538
 539                 // Get transport
 540                 transport = jQuery.ajax.prefilter( s ).transport( s );
 541
 542                 // If no transport, we auto-abort
 543                 if ( ! transport ) {
 544
 545                         done( 0 , "transport not found" );
 546                         jXHR = false;
 547
 548                 } else {
 549
 550                         // More options handling for requests with no content
 551                         if ( ! s.hasContent ) {
 552
 553                                 // If data is available, append data to url
 554                                 if ( s.data ) {
 555                                         s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
 556                                 }
 557
 558                                 // Add anti-cache in url if needed
 559                                 if ( s.cache === false ) {
 560
 561                                         var ts = jQuery.now(),
 562                                                 // try replacing _= if it is there
 563                                                 ret = s.url.replace( rts , "$1_=" + ts );
 564
 565                                         // if nothing was replaced, add timestamp to the end
 566                                         s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
 567                                 }
 568                         }
 569
 570                         // Set the correct header, if data is being sent
 571                         if ( ( s.data && s.hasContent ) || options.contentType ) {
 572                                 requestHeaders[ "content-type" ] = s.contentType;
 573                         }
 574
 575                         // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 576                         if ( s.ifModified ) {
 577                                 if ( jQuery_lastModified[ s.url ] ) {
 578                                         requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
 579                                 }
 580                                 if ( jQuery_etag[ s.url ] ) {
 581                                         requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
 582                                 }
 583                         }
 584
 585                         // Set the Accepts header for the server, depending on the dataType
 586                         requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
 587                                 s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
 588                                 s.accepts[ "*" ];
 589
 590                         // Check for headers option
 591                         for ( i in s.headers ) {
 592                                 requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
 593                         }
 594
 595                         // Allow custom headers/mimetypes and early abort
 596                         if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
 597
 598                                         // Abort if not done already
 599                                         done( 0 , "abort" );
 600                                         jXHR = false;
 601
 602                         } else {
 603
 604                                 // Set state as sending
 605                                 state = 1;
 606                                 jXHR.readyState = 1;
 607
 608                                 // Install callbacks on deferreds
 609                                 for ( i in { success:1, error:1, complete:1 } ) {
 610                                         jXHR[ i ]( s[ i ] );
 611                                 }
 612
 613                                 // Send global event
 614                                 if ( s.global ) {
 615                                         globalEventContext.trigger( "ajaxSend" , [ jXHR , s ] );
 616                                 }
 617
 618                                 // Timeout
 619                                 if ( s.async && s.timeout > 0 ) {
 620                                         timeoutTimer = setTimeout(function(){
 621                                                 jXHR.abort( "timeout" );
 622                                         }, s.timeout);
 623                                 }
 624
 625                                 // Try to send
 626                                 try {
 627                                         transport.send(requestHeaders, done);
 628                                 } catch (e) {
 629                                         // Propagate exception as error if not done
 630                                         if ( status === 1 ) {
 631
 632                                                 done(0, "error", "" + e);
 633                                                 jXHR = false;
 634
 635                                         // Simply rethrow otherwise
 636                                         } else {
 637                                                 jQuery.error(e);
 638                                         }
 639                                 }
 640                         }
 641                 }
 642
 643                 return jXHR;
 644         },
 645
 646         // Serialize an array of form elements or a set of
 647         // key/values into a query string
 648         param: function( a, traditional ) {
 649                 var s = [],
 650                         add = function( key, value ) {
 651                                 // If value is a function, invoke it and return its value
 652                                 value = jQuery.isFunction(value) ? value() : value;
 653                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 654                         };
 655
 656                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 657                 if ( traditional === undefined ) {
 658                         traditional = jQuery.ajaxSettings.traditional;
 659                 }
 660
 661                 // If an array was passed in, assume that it is an array of form elements.
 662                 if ( jQuery.isArray(a) || a.jquery ) {
 663                         // Serialize the form elements
 664                         jQuery.each( a, function() {
 665                                 add( this.name, this.value );
 666                         });
 667
 668                 } else {
 669                         // If traditional, encode the "old" way (the way 1.3.2 or older
 670                         // did it), otherwise encode params recursively.
 671                         for ( var prefix in a ) {
 672                                 buildParams( prefix, a[prefix], traditional, add );
 673                         }
 674                 }
 675
 676                 // Return the resulting serialization
 677                 return s.join("&").replace(r20, "+");
 678         }
 679 });
 680
 681 function buildParams( prefix, obj, traditional, add ) {
 682         if ( jQuery.isArray(obj) && obj.length ) {
 683                 // Serialize array item.
 684                 jQuery.each( obj, function( i, v ) {
 685                         if ( traditional || rbracket.test( prefix ) ) {
 686                                 // Treat each array item as a scalar.
 687                                 add( prefix, v );
 688
 689                         } else {
 690                                 // If array item is non-scalar (array or object), encode its
 691                                 // numeric index to resolve deserialization ambiguity issues.
 692                                 // Note that rack (as of 1.0.0) can't currently deserialize
 693                                 // nested arrays properly, and attempting to do so may cause
 694                                 // a server error. Possible fixes are to modify rack's
 695                                 // deserialization algorithm or to provide an option or flag
 696                                 // to force array serialization to be shallow.
 697                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 698                         }
 699                 });
 700
 701         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 702                 // If we see an array here, it is empty and should be treated as an empty
 703                 // object
 704                 if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
 705                         add( prefix, "" );
 706
 707                 // Serialize object item.
 708                 } else {
 709                         jQuery.each( obj, function( k, v ) {
 710                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 711                         });
 712                 }
 713
 714         } else {
 715                 // Serialize scalar item.
 716                 add( prefix, obj );
 717         }
 718 }
 719
 720 // This is still on the jQuery object... for now
 721 // Want to move this to jQuery.ajax some day
 722 jQuery.extend({
 723
 724         // Counter for holding the number of active queries
 725         active: 0,
 726
 727         // Last-Modified header cache for next request
 728         lastModified: {},
 729         etag: {}
 730
 731 });
 732
 733 //Execute or select from functions in a given structure of options
 734 function ajax_selectOrExecute( structure , s ) {
 735
 736         var dataTypes = s.dataTypes,
 737                 transportDataType,
 738                 list,
 739                 selected,
 740                 i,
 741                 length,
 742                 checked = {},
 743                 flag,
 744                 noSelect = structure !== "transports";
 745
 746         function initSearch( dataType ) {
 747
 748                 flag = transportDataType !== dataType && ! checked[ dataType ];
 749
 750                 if ( flag ) {
 751
 752                         checked[ dataType ] = 1;
 753                         transportDataType = dataType;
 754                         list = s[ structure ][ dataType ];
 755                         i = -1;
 756                         length = list ? list.length : 0 ;
 757                 }
 758
 759                 return flag;
 760         }
 761
 762         initSearch( dataTypes[ 0 ] );
 763
 764         for ( i = 0 ; ( noSelect || ! selected ) && i <= length ; i++ ) {
 765
 766                 if ( i === length ) {
 767
 768                         initSearch( "*" );
 769
 770                 } else {
 771
 772                         selected = list[ i ]( s , determineDataType );
 773
 774                         // If we got redirected to another dataType
 775                         // Search there (if not in progress or already tried)
 776                         if ( typeof( selected ) === "string" &&
 777                                 initSearch( selected ) ) {
 778
 779                                 dataTypes.unshift( selected );
 780                                 selected = 0;
 781                         }
 782                 }
 783         }
 784
 785         return noSelect ? jQuery.ajax : selected;
 786 }
 787
 788 // Add an element to one of the structures in ajaxSettings
 789 function ajax_addElement( structure , args ) {
 790
 791         var i,
 792                 start = 0,
 793                 length = args.length,
 794                 dataTypes = [ "*" ],
 795                 dLength = 1,
 796                 dataType,
 797                 functors = [],
 798                 first,
 799                 append,
 800                 list;
 801
 802         if ( length ) {
 803
 804                 first = jQuery.type( args[ 0 ] );
 805
 806                 if ( first === "object" ) {
 807                         return ajax_selectOrExecute( structure , args[ 0 ] );
 808                 }
 809
 810                 structure = jQuery.ajaxSettings[ structure ];
 811
 812                 if ( first !== "function" ) {
 813
 814                         dataTypes = args[ 0 ].toLowerCase().split(/\s+/);
 815                         dLength = dataTypes.length;
 816                         start = 1;
 817
 818                 }
 819
 820                 if ( dLength && start < length ) {
 821
 822                         functors = sliceFunc.call( args , start );
 823
 824                         for( i = 0 ; i < dLength ; i++ ) {
 825
 826                                 dataType = dataTypes[ i ];
 827
 828                                 first = /^\+/.test( dataType );
 829
 830                                 if (first) {
 831                                         dataType = dataType.substr(1);
 832                                 }
 833
 834                                 if ( dataType !== "" ) {
 835
 836                                         append = Array.prototype[ first ? "unshift" : "push" ];
 837                                         list = structure[ dataType ] = structure[ dataType ] || [];
 838                                         append.apply( list , functors );
 839                                 }
 840                         }
 841                 }
 842         }
 843
 844         return jQuery.ajax;
 845 }
 846
 847 // Install prefilter & transport methods
 848 jQuery.each( [ "prefilter" , "transport" ] , function( _ , name ) {
 849         _ = name + "s";
 850         jQuery.ajax[ name ] = function() {
 851                 return ajax_addElement( _ , arguments );
 852         };
 853 } );
 854
 855 // Utility function that handles dataType when response is received
 856 // (for those transports that can give text or xml responses)
 857 function determineDataType( s , ct , text , xml ) {
 858
 859         var autoDataType = s.autoDataType,
 860                 type,
 861                 regexp,
 862                 dataTypes = s.dataTypes,
 863                 transportDataType = dataTypes[0],
 864                 response;
 865
 866         // Auto (xml, json, script or text determined given headers)
 867         if ( transportDataType === "*" ) {
 868
 869                 for ( type in autoDataType ) {
 870                         if ( ( regexp = autoDataType[ type ] ) && regexp.test( ct ) ) {
 871                                 transportDataType = dataTypes[0] = type;
 872                                 break;
 873                         }
 874                 }
 875         }
 876
 877         // xml and parsed as such
 878         if ( transportDataType === "xml" &&
 879                 xml &&
 880                 xml.documentElement /* #4958 */ ) {
 881
 882                 response = xml;
 883
 884         // Text response was provided
 885         } else {
 886
 887                 response = text;
 888
 889                 // If it's not really text, defer to dataConverters
 890                 if ( transportDataType !== "text" ) {
 891                         dataTypes.unshift( "text" );
 892                 }
 893
 894         }
 895
 896         return response;
 897 }
 898
 899 /*
 900  * Create the request object; Microsoft failed to properly
 901  * implement the XMLHttpRequest in IE7 (can't request local files),
 902  * so we use the ActiveXObject when it is available
 903  * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
 904  * we need a fallback.
 905  */
 906 if ( window.ActiveXObject ) {
 907         jQuery.ajaxSettings.xhr = function() {
 908         if ( window.location.protocol !== "file:" ) {
 909                 try {
 910                         return new window.XMLHttpRequest();
 911                 } catch( xhrError ) {}
 912         }
 913
 914         try {
 915                 return new window.ActiveXObject("Microsoft.XMLHTTP");
 916         } catch( activeError ) {}
 917         };
 918 }
 919
 920 var testXHR = jQuery.ajaxSettings.xhr();
 921
 922 // Does this browser support XHR requests?
 923 jQuery.support.ajax = !!testXHR;
 924
 925 // Does this browser support crossDomain XHR requests
 926 jQuery.support.cors = testXHR && "withCredentials" in testXHR;
 927
 928 })( jQuery );