src/ajax.js

   1 (function( jQuery ) {
   2
   3 var jsc = jQuery.now(),
   4         rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
   5         rselectTextarea = /^(?:select|textarea)/i,
   6         rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
   7         rnoContent = /^(?:GET|HEAD|DELETE)$/,
   8         rbracket = /\[\]$/,
   9         jsre = /\=\?(&|$)/,
  10         rquery = /\?/,
  11         rts = /([?&])_=[^&]*/,
  12         rurl = /^(\w+:)?\/\/([^\/?#]+)/,
  13         r20 = /%20/g,
  14         rhash = /#.*$/,
  15
  16         // Keep a copy of the old load method
  17         _load = jQuery.fn.load;
  18
  19 jQuery.fn.extend({
  20         load: function( url, params, callback ) {
  21                 if ( typeof url !== "string" && _load ) {
  22                         return _load.apply( this, arguments );
  23
  24                 // Don't do a request if no elements are being requested
  25                 } else if ( !this.length ) {
  26                         return this;
  27                 }
  28
  29                 var off = url.indexOf(" ");
  30                 if ( off >= 0 ) {
  31                         var selector = url.slice(off, url.length);
  32                         url = url.slice(0, off);
  33                 }
  34
  35                 // Default to a GET request
  36                 var type = "GET";
  37
  38                 // If the second parameter was provided
  39                 if ( params ) {
  40                         // If it's a function
  41                         if ( jQuery.isFunction( params ) ) {
  42                                 // We assume that it's the callback
  43                                 callback = params;
  44                                 params = null;
  45
  46                         // Otherwise, build a param string
  47                         } else if ( typeof params === "object" ) {
  48                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
  49                                 type = "POST";
  50                         }
  51                 }
  52
  53                 var self = this;
  54
  55                 // Request the remote document
  56                 jQuery.ajax({
  57                         url: url,
  58                         type: type,
  59                         dataType: "html",
  60                         data: params,
  61                         complete: function( res, status ) {
  62                                 // If successful, inject the HTML into all the matched elements
  63                                 if ( status === "success" || status === "notmodified" ) {
  64                                         // See if a selector was specified
  65                                         self.html( selector ?
  66                                                 // Create a dummy div to hold the results
  67                                                 jQuery("<div>")
  68                                                         // inject the contents of the document in, removing the scripts
  69                                                         // to avoid any 'Permission Denied' errors in IE
  70                                                         .append(res.responseText.replace(rscript, ""))
  71
  72                                                         // Locate the specified elements
  73                                                         .find(selector) :
  74
  75                                                 // If not, just inject the full result
  76                                                 res.responseText );
  77                                 }
  78
  79                                 if ( callback ) {
  80                                         self.each( callback, [res.responseText, status, res] );
  81                                 }
  82                         }
  83                 });
  84
  85                 return this;
  86         },
  87
  88         serialize: function() {
  89                 return jQuery.param(this.serializeArray());
  90         },
  91
  92         serializeArray: function() {
  93                 return this.map(function() {
  94                         return this.elements ? jQuery.makeArray(this.elements) : this;
  95                 })
  96                 .filter(function() {
  97                         return this.name && !this.disabled &&
  98                                 (this.checked || rselectTextarea.test(this.nodeName) ||
  99                                         rinput.test(this.type));
 100                 })
 101                 .map(function( i, elem ) {
 102                         var val = jQuery(this).val();
 103
 104                         return val == null ?
 105                                 null :
 106                                 jQuery.isArray(val) ?
 107                                         jQuery.map( val, function( val, i ) {
 108                                                 return { name: elem.name, value: val };
 109                                         }) :
 110                                         { name: elem.name, value: val };
 111                 }).get();
 112         }
 113 });
 114
 115 // Attach a bunch of functions for handling common AJAX events
 116 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function( i, o ) {
 117         jQuery.fn[o] = function( f ) {
 118                 return this.bind(o, f);
 119         };
 120 });
 121
 122 jQuery.extend({
 123         get: function( url, data, callback, type ) {
 124                 // shift arguments if data argument was omited
 125                 if ( jQuery.isFunction( data ) ) {
 126                         type = type || callback;
 127                         callback = data;
 128                         data = null;
 129                 }
 130
 131                 return jQuery.ajax({
 132                         type: "GET",
 133                         url: url,
 134                         data: data,
 135                         success: callback,
 136                         dataType: type
 137                 });
 138         },
 139
 140         getScript: function( url, callback ) {
 141                 return jQuery.get(url, null, callback, "script");
 142         },
 143
 144         getJSON: function( url, data, callback ) {
 145                 return jQuery.get(url, data, callback, "json");
 146         },
 147
 148         post: function( url, data, callback, type ) {
 149                 // shift arguments if data argument was omited
 150                 if ( jQuery.isFunction( data ) ) {
 151                         type = type || callback;
 152                         callback = data;
 153                         data = {};
 154                 }
 155
 156                 return jQuery.ajax({
 157                         type: "POST",
 158                         url: url,
 159                         data: data,
 160                         success: callback,
 161                         dataType: type
 162                 });
 163         },
 164
 165         ajaxSetup: function( settings ) {
 166                 jQuery.extend( jQuery.ajaxSettings, settings );
 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                 username: null,
 180                 password: null,
 181                 traditional: false,
 182                 */
 183                 // Create the request object; Microsoft failed to properly
 184                 // implement the XMLHttpRequest in IE7 (can't request local files),
 185                 // so we use the ActiveXObject when it is available
 186                 // This function can be overriden by calling jQuery.ajaxSetup
 187                 xhr: window.XMLHttpRequest && (window.location.protocol !== "file:" || !window.ActiveXObject) ?
 188                         function() {
 189                                 return new window.XMLHttpRequest();
 190                         } :
 191                         function() {
 192                                 try {
 193                                         return new window.ActiveXObject("Microsoft.XMLHTTP");
 194                                 } catch(e) {}
 195                         },
 196                 accepts: {
 197                         xml: "application/xml, text/xml",
 198                         html: "text/html",
 199                         script: "text/javascript, application/javascript",
 200                         json: "application/json, text/javascript",
 201                         text: "text/plain",
 202                         _default: "*/*"
 203                 }
 204         },
 205
 206         ajax: function( origSettings ) {
 207                 var s = jQuery.extend(true, {}, jQuery.ajaxSettings, origSettings),
 208                         jsonp, status, data, type = s.type.toUpperCase(), noContent = rnoContent.test(type);
 209
 210                 s.url = s.url.replace( rhash, "" );
 211
 212                 // Use original (not extended) context object if it was provided
 213                 s.context = origSettings && origSettings.context != null ? origSettings.context : s;
 214
 215                 // convert data if not already a string
 216                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 217                         s.data = jQuery.param( s.data, s.traditional );
 218                 }
 219
 220                 // Handle JSONP Parameter Callbacks
 221                 if ( s.dataType === "jsonp" ) {
 222                         if ( type === "GET" ) {
 223                                 if ( !jsre.test( s.url ) ) {
 224                                         s.url += (rquery.test( s.url ) ? "&" : "?") + (s.jsonp || "callback") + "=?";
 225                                 }
 226                         } else if ( !s.data || !jsre.test(s.data) ) {
 227                                 s.data = (s.data ? s.data + "&" : "") + (s.jsonp || "callback") + "=?";
 228                         }
 229                         s.dataType = "json";
 230                 }
 231
 232                 // Build temporary JSONP function
 233                 if ( s.dataType === "json" && (s.data && jsre.test(s.data) || jsre.test(s.url)) ) {
 234                         jsonp = s.jsonpCallback || ("jsonp" + jsc++);
 235
 236                         // Replace the =? sequence both in the query string and the data
 237                         if ( s.data ) {
 238                                 s.data = (s.data + "").replace(jsre, "=" + jsonp + "$1");
 239                         }
 240
 241                         s.url = s.url.replace(jsre, "=" + jsonp + "$1");
 242
 243                         // We need to make sure
 244                         // that a JSONP style response is executed properly
 245                         s.dataType = "script";
 246
 247                         // Handle JSONP-style loading
 248                         var customJsonp = window[ jsonp ];
 249
 250                         window[ jsonp ] = function( tmp ) {
 251                                 data = tmp;
 252                                 jQuery.ajax.handleSuccess( s, xhr, status, data );
 253                                 jQuery.ajax.handleComplete( s, xhr, status, data );
 254
 255                                 if ( jQuery.isFunction( customJsonp ) ) {
 256                                         customJsonp( tmp );
 257
 258                                 } else {
 259                                         // Garbage collect
 260                                         window[ jsonp ] = undefined;
 261
 262                                         try {
 263                                                 delete window[ jsonp ];
 264                                         } catch( jsonpError ) {}
 265                                 }
 266
 267                                 if ( head ) {
 268                                         head.removeChild( script );
 269                                 }
 270                         };
 271                 }
 272
 273                 if ( s.dataType === "script" && s.cache === null ) {
 274                         s.cache = false;
 275                 }
 276
 277                 if ( s.cache === false && type === "GET" ) {
 278                         var ts = jQuery.now();
 279
 280                         // try replacing _= if it is there
 281                         var ret = s.url.replace(rts, "$1_=" + ts);
 282
 283                         // if nothing was replaced, add timestamp to the end
 284                         s.url = ret + ((ret === s.url) ? (rquery.test(s.url) ? "&" : "?") + "_=" + ts : "");
 285                 }
 286
 287                 // If data is available, append data to url for get requests
 288                 if ( s.data && type === "GET" ) {
 289                         s.url += (rquery.test(s.url) ? "&" : "?") + s.data;
 290                 }
 291
 292                 // Watch for a new set of requests
 293                 if ( s.global && jQuery.ajax.active++ === 0 ) {
 294                         jQuery.event.trigger( "ajaxStart" );
 295                 }
 296
 297                 // Matches an absolute URL, and saves the domain
 298                 var parts = rurl.exec( s.url ),
 299                         remote = parts && (parts[1] && parts[1] !== location.protocol || parts[2] !== location.host);
 300
 301                 // If we're requesting a remote document
 302                 // and trying to load JSON or Script with a GET
 303                 if ( s.dataType === "script" && type === "GET" && remote ) {
 304                         var head = document.getElementsByTagName("head")[0] || document.documentElement;
 305                         var script = document.createElement("script");
 306                         if ( s.scriptCharset ) {
 307                                 script.charset = s.scriptCharset;
 308                         }
 309                         script.src = s.url;
 310
 311                         // Handle Script loading
 312                         if ( !jsonp ) {
 313                                 var done = false;
 314
 315                                 // Attach handlers for all browsers
 316                                 script.onload = script.onreadystatechange = function() {
 317                                         if ( !done && (!this.readyState ||
 318                                                         this.readyState === "loaded" || this.readyState === "complete") ) {
 319                                                 done = true;
 320                                                 jQuery.ajax.handleSuccess( s, xhr, status, data );
 321                                                 jQuery.ajax.handleComplete( s, xhr, status, data );
 322
 323                                                 // Handle memory leak in IE
 324                                                 script.onload = script.onreadystatechange = null;
 325                                                 if ( head && script.parentNode ) {
 326                                                         head.removeChild( script );
 327                                                 }
 328                                         }
 329                                 };
 330                         }
 331
 332                         // Use insertBefore instead of appendChild  to circumvent an IE6 bug.
 333                         // This arises when a base node is used (#2709 and #4378).
 334                         head.insertBefore( script, head.firstChild );
 335
 336                         // We handle everything using the script element injection
 337                         return undefined;
 338                 }
 339
 340                 var requestDone = false;
 341
 342                 // Create the request object
 343                 var xhr = s.xhr();
 344
 345                 if ( !xhr ) {
 346                         return;
 347                 }
 348
 349                 // Open the socket
 350                 // Passing null username, generates a login popup on Opera (#2865)
 351                 if ( s.username ) {
 352                         xhr.open(type, s.url, s.async, s.username, s.password);
 353                 } else {
 354                         xhr.open(type, s.url, s.async);
 355                 }
 356
 357                 // Need an extra try/catch for cross domain requests in Firefox 3
 358                 try {
 359                         // Set content-type if data specified and content-body is valid for this type
 360                         if ( (s.data != null && !noContent) || (origSettings && origSettings.contentType) ) {
 361                                 xhr.setRequestHeader("Content-Type", s.contentType);
 362                         }
 363
 364                         // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 365                         if ( s.ifModified ) {
 366                                 if ( jQuery.lastModified[s.url] ) {
 367                                         xhr.setRequestHeader("If-Modified-Since", jQuery.lastModified[s.url]);
 368                                 }
 369
 370                                 if ( jQuery.ajax.etag[s.url] ) {
 371                                         xhr.setRequestHeader("If-None-Match", jQuery.ajax.etag[s.url]);
 372                                 }
 373                         }
 374
 375                         // Set header so the called script knows that it's an XMLHttpRequest
 376                         // Only send the header if it's not a remote XHR
 377                         if ( !remote ) {
 378                                 xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
 379                         }
 380
 381                         // Set the Accepts header for the server, depending on the dataType
 382                         xhr.setRequestHeader("Accept", s.dataType && s.accepts[ s.dataType ] ?
 383                                 s.accepts[ s.dataType ] + ", */*; q=0.01" :
 384                                 s.accepts._default );
 385                 } catch( headerError ) {}
 386
 387                 // Allow custom headers/mimetypes and early abort
 388                 if ( s.beforeSend && s.beforeSend.call(s.context, xhr, s) === false ) {
 389                         // Handle the global AJAX counter
 390                         if ( s.global && jQuery.ajax.active-- === 1 ) {
 391                                 jQuery.event.trigger( "ajaxStop" );
 392                         }
 393
 394                         // close opended socket
 395                         xhr.abort();
 396                         return false;
 397                 }
 398
 399                 if ( s.global ) {
 400                         jQuery.ajax.triggerGlobal( s, "ajaxSend", [xhr, s] );
 401                 }
 402
 403                 // Wait for a response to come back
 404                 var onreadystatechange = xhr.onreadystatechange = function( isTimeout ) {
 405                         // The request was aborted
 406                         if ( !xhr || xhr.readyState === 0 || isTimeout === "abort" ) {
 407                                 // Opera doesn't call onreadystatechange before this point
 408                                 // so we simulate the call
 409                                 if ( !requestDone ) {
 410                                         jQuery.ajax.handleComplete( s, xhr, status, data );
 411                                 }
 412
 413                                 requestDone = true;
 414                                 if ( xhr ) {
 415                                         xhr.onreadystatechange = jQuery.noop;
 416                                 }
 417
 418                         // The transfer is complete and the data is available, or the request timed out
 419                         } else if ( !requestDone && xhr && (xhr.readyState === 4 || isTimeout === "timeout") ) {
 420                                 requestDone = true;
 421                                 xhr.onreadystatechange = jQuery.noop;
 422
 423                                 status = isTimeout === "timeout" ?
 424                                         "timeout" :
 425                                         !jQuery.ajax.httpSuccess( xhr ) ?
 426                                                 "error" :
 427                                                 s.ifModified && jQuery.ajax.httpNotModified( xhr, s.url ) ?
 428                                                         "notmodified" :
 429                                                         "success";
 430
 431                                 var errMsg;
 432
 433                                 if ( status === "success" ) {
 434                                         // Watch for, and catch, XML document parse errors
 435                                         try {
 436                                                 // process the data (runs the xml through httpData regardless of callback)
 437                                                 data = jQuery.ajax.httpData( xhr, s.dataType, s );
 438                                         } catch( parserError ) {
 439                                                 status = "parsererror";
 440                                                 errMsg = parserError;
 441                                         }
 442                                 }
 443
 444                                 // Make sure that the request was successful or notmodified
 445                                 if ( status === "success" || status === "notmodified" ) {
 446                                         // JSONP handles its own success callback
 447                                         if ( !jsonp ) {
 448                                                 jQuery.ajax.handleSuccess( s, xhr, status, data );
 449                                         }
 450                                 } else {
 451                                         jQuery.ajax.handleError( s, xhr, status, errMsg );
 452                                 }
 453
 454                                 // Fire the complete handlers
 455                                 if ( !jsonp ) {
 456                                         jQuery.ajax.handleComplete( s, xhr, status, data );
 457                                 }
 458
 459                                 if ( isTimeout === "timeout" ) {
 460                                         xhr.abort();
 461                                 }
 462
 463                                 // Stop memory leaks
 464                                 if ( s.async ) {
 465                                         xhr = null;
 466                                 }
 467                         }
 468                 };
 469
 470                 // Override the abort handler, if we can (IE doesn't allow it, but that's OK)
 471                 // Opera doesn't fire onreadystatechange at all on abort
 472                 try {
 473                         var oldAbort = xhr.abort;
 474                         xhr.abort = function() {
 475                                 if ( xhr ) {
 476                                         oldAbort.call( xhr );
 477                                 }
 478
 479                                 onreadystatechange( "abort" );
 480                         };
 481                 } catch( abortError ) {}
 482
 483                 // Timeout checker
 484                 if ( s.async && s.timeout > 0 ) {
 485                         setTimeout(function() {
 486                                 // Check to see if the request is still happening
 487                                 if ( xhr && !requestDone ) {
 488                                         onreadystatechange( "timeout" );
 489                                 }
 490                         }, s.timeout);
 491                 }
 492
 493                 // Send the data
 494                 try {
 495                         xhr.send( noContent || s.data == null ? null : s.data );
 496
 497                 } catch( sendError ) {
 498                         jQuery.ajax.handleError( s, xhr, null, sendError );
 499
 500                         // Fire the complete handlers
 501                         jQuery.ajax.handleComplete( s, xhr, status, data );
 502                 }
 503
 504                 // firefox 1.5 doesn't fire statechange for sync requests
 505                 if ( !s.async ) {
 506                         onreadystatechange();
 507                 }
 508
 509                 // return XMLHttpRequest to allow aborting the request etc.
 510                 return xhr;
 511         },
 512
 513         // Serialize an array of form elements or a set of
 514         // key/values into a query string
 515         param: function( a, traditional ) {
 516                 var s = [], add = function( key, value ) {
 517                         // If value is a function, invoke it and return its value
 518                         value = jQuery.isFunction(value) ? value() : value;
 519                         s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 520                 };
 521
 522                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 523                 if ( traditional === undefined ) {
 524                         traditional = jQuery.ajaxSettings.traditional;
 525                 }
 526
 527                 // If an array was passed in, assume that it is an array of form elements.
 528                 if ( jQuery.isArray(a) || a.jquery ) {
 529                         // Serialize the form elements
 530                         jQuery.each( a, function() {
 531                                 add( this.name, this.value );
 532                         });
 533
 534                 } else {
 535                         // If traditional, encode the "old" way (the way 1.3.2 or older
 536                         // did it), otherwise encode params recursively.
 537                         for ( var prefix in a ) {
 538                                 buildParams( prefix, a[prefix], traditional, add );
 539                         }
 540                 }
 541
 542                 // Return the resulting serialization
 543                 return s.join("&").replace(r20, "+");
 544         }
 545 });
 546
 547 function buildParams( prefix, obj, traditional, add ) {
 548         if ( jQuery.isArray(obj) && obj.length ) {
 549                 // Serialize array item.
 550                 jQuery.each( obj, function( i, v ) {
 551                         if ( traditional || rbracket.test( prefix ) ) {
 552                                 // Treat each array item as a scalar.
 553                                 add( prefix, v );
 554
 555                         } else {
 556                                 // If array item is non-scalar (array or object), encode its
 557                                 // numeric index to resolve deserialization ambiguity issues.
 558                                 // Note that rack (as of 1.0.0) can't currently deserialize
 559                                 // nested arrays properly, and attempting to do so may cause
 560                                 // a server error. Possible fixes are to modify rack's
 561                                 // deserialization algorithm or to provide an option or flag
 562                                 // to force array serialization to be shallow.
 563                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 564                         }
 565                 });
 566
 567         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 568                 if ( jQuery.isEmptyObject( obj ) ) {
 569                         add( prefix, "" );
 570
 571                 // Serialize object item.
 572                 } else {
 573                         jQuery.each( obj, function( k, v ) {
 574                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 575                         });
 576                 }
 577
 578         } else {
 579                 // Serialize scalar item.
 580                 add( prefix, obj );
 581         }
 582 }
 583
 584 jQuery.extend( jQuery.ajax, {
 585
 586         // Counter for holding the number of active queries
 587         active: 0,
 588
 589         // Last-Modified header cache for next request
 590         lastModified: {},
 591         etag: {},
 592
 593         handleError: function( s, xhr, status, e ) {
 594                 // If a local callback was specified, fire it
 595                 if ( s.error ) {
 596                         s.error.call( s.context, xhr, status, e );
 597                 }
 598
 599                 // Fire the global callback
 600                 if ( s.global ) {
 601                         jQuery.ajax.triggerGlobal( s, "ajaxError", [xhr, s, e] );
 602                 }
 603         },
 604
 605         handleSuccess: function( s, xhr, status, data ) {
 606                 // If a local callback was specified, fire it and pass it the data
 607                 if ( s.success ) {
 608                         s.success.call( s.context, data, status, xhr );
 609                 }
 610
 611                 // Fire the global callback
 612                 if ( s.global ) {
 613                         jQuery.ajax.triggerGlobal( s, "ajaxSuccess", [xhr, s] );
 614                 }
 615         },
 616
 617         handleComplete: function( s, xhr, status ) {
 618                 // Process result
 619                 if ( s.complete ) {
 620                         s.complete.call( s.context, xhr, status );
 621                 }
 622
 623                 // The request was completed
 624                 if ( s.global ) {
 625                         jQuery.ajax.triggerGlobal( s, "ajaxComplete", [xhr, s] );
 626                 }
 627
 628                 // Handle the global AJAX counter
 629                 if ( s.global && jQuery.ajax.active-- === 1 ) {
 630                         jQuery.event.trigger( "ajaxStop" );
 631                 }
 632         },
 633
 634         triggerGlobal: function( s, type, args ) {
 635                 (s.context && s.context.url == null ? jQuery(s.context) : jQuery.event).trigger(type, args);
 636         },
 637
 638         // Determines if an XMLHttpRequest was successful or not
 639         httpSuccess: function( xhr ) {
 640                 try {
 641                         // IE error sometimes returns 1223 when it should be 204 so treat it as success, see #1450
 642                         return !xhr.status && location.protocol === "file:" ||
 643                                 xhr.status >= 200 && xhr.status < 300 ||
 644                                 xhr.status === 304 || xhr.status === 1223;
 645                 } catch(e) {}
 646
 647                 return false;
 648         },
 649
 650         // Determines if an XMLHttpRequest returns NotModified
 651         httpNotModified: function( xhr, url ) {
 652                 var lastModified = xhr.getResponseHeader("Last-Modified"),
 653                         etag = xhr.getResponseHeader("Etag");
 654
 655                 if ( lastModified ) {
 656                         jQuery.ajax.lastModified[url] = lastModified;
 657                 }
 658
 659                 if ( etag ) {
 660                         jQuery.ajax.etag[url] = etag;
 661                 }
 662
 663                 return xhr.status === 304;
 664         },
 665
 666         httpData: function( xhr, type, s ) {
 667                 var ct = xhr.getResponseHeader("content-type") || "",
 668                         xml = type === "xml" || !type && ct.indexOf("xml") >= 0,
 669                         data = xml ? xhr.responseXML : xhr.responseText;
 670
 671                 if ( xml && data.documentElement.nodeName === "parsererror" ) {
 672                         jQuery.error( "parsererror" );
 673                 }
 674
 675                 // Allow a pre-filtering function to sanitize the response
 676                 // s is checked to keep backwards compatibility
 677                 if ( s && s.dataFilter ) {
 678                         data = s.dataFilter( data, type );
 679                 }
 680
 681                 // The filter can actually parse the response
 682                 if ( typeof data === "string" ) {
 683                         // Get the JavaScript object, if JSON is used.
 684                         if ( type === "json" || !type && ct.indexOf("json") >= 0 ) {
 685                                 data = jQuery.parseJSON( data );
 686
 687                         // If the type is "script", eval it in global context
 688                         } else if ( type === "script" || !type && ct.indexOf("javascript") >= 0 ) {
 689                                 jQuery.globalEval( data );
 690                         }
 691                 }
 692
 693                 return data;
 694         }
 695
 696 });
 697
 698 // Does this browser support XHR requests?
 699 jQuery.support.ajax = !!jQuery.ajaxSettings.xhr();
 700
 701 // For backwards compatibility
 702 jQuery.extend( jQuery.ajax );
 703
 704 })( jQuery );