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         rbracket = /\[\]$/,
   8         jsre = /\=\?(&|$)/,
   9         rquery = /\?/,
  10         rts = /([?&])_=[^&]*(&?)/,
  11         rurl = /^(\w+:)?\/\/([^\/?#]+)/,
  12         r20 = /%20/g,
  13         rhash = /#.*$/,
  14
  15         // Keep a copy of the old load method
  16         _load = jQuery.fn.load;
  17
  18 jQuery.fn.extend({
  19         load: function( url, params, callback ) {
  20                 if ( typeof url !== "string" && _load ) {
  21                         return _load.apply( this, arguments );
  22
  23                 // Don't do a request if no elements are being requested
  24                 } else if ( !this.length ) {
  25                         return this;
  26                 }
  27
  28                 var off = url.indexOf(" ");
  29                 if ( off >= 0 ) {
  30                         var selector = url.slice(off, url.length);
  31                         url = url.slice(0, off);
  32                 }
  33
  34                 // Default to a GET request
  35                 var type = "GET";
  36
  37                 // If the second parameter was provided
  38                 if ( params ) {
  39                         // If it's a function
  40                         if ( jQuery.isFunction( params ) ) {
  41                                 // We assume that it's the callback
  42                                 callback = params;
  43                                 params = null;
  44
  45                         // Otherwise, build a param string
  46                         } else if ( typeof params === "object" ) {
  47                                 params = jQuery.param( params, jQuery.ajaxSettings.traditional );
  48                                 type = "POST";
  49                         }
  50                 }
  51
  52                 var self = this;
  53
  54                 // Request the remote document
  55                 jQuery.ajax({
  56                         url: url,
  57                         type: type,
  58                         dataType: "html",
  59                         data: params,
  60                         complete: function( res, status ) {
  61                                 // If successful, inject the HTML into all the matched elements
  62                                 if ( status === "success" || status === "notmodified" ) {
  63                                         // See if a selector was specified
  64                                         self.html( selector ?
  65                                                 // Create a dummy div to hold the results
  66                                                 jQuery("<div>")
  67                                                         // inject the contents of the document in, removing the scripts
  68                                                         // to avoid any 'Permission Denied' errors in IE
  69                                                         .append(res.responseText.replace(rscript, ""))
  70
  71                                                         // Locate the specified elements
  72                                                         .find(selector) :
  73
  74                                                 // If not, just inject the full result
  75                                                 res.responseText );
  76                                 }
  77
  78                                 if ( callback ) {
  79                                         self.each( callback, [res.responseText, status, res] );
  80                                 }
  81                         }
  82                 });
  83
  84                 return this;
  85         },
  86
  87         serialize: function() {
  88                 return jQuery.param(this.serializeArray());
  89         },
  90
  91         serializeArray: function() {
  92                 return this.map(function() {
  93                         return this.elements ? jQuery.makeArray(this.elements) : this;
  94                 })
  95                 .filter(function() {
  96                         return this.name && !this.disabled &&
  97                                 (this.checked || rselectTextarea.test(this.nodeName) ||
  98                                         rinput.test(this.type));
  99                 })
 100                 .map(function( i, elem ) {
 101                         var val = jQuery(this).val();
 102
 103                         return val == null ?
 104                                 null :
 105                                 jQuery.isArray(val) ?
 106                                         jQuery.map( val, function( val, i ) {
 107                                                 return { name: elem.name, value: val };
 108                                         }) :
 109                                         { name: elem.name, value: val };
 110                 }).get();
 111         }
 112 });
 113
 114 // Attach a bunch of functions for handling common AJAX events
 115 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function( i, o ) {
 116         jQuery.fn[o] = function( f ) {
 117                 return this.bind(o, f);
 118         };
 119 });
 120
 121 jQuery.extend({
 122         get: function( url, data, callback, type ) {
 123                 // shift arguments if data argument was omited
 124                 if ( jQuery.isFunction( data ) ) {
 125                         type = type || callback;
 126                         callback = data;
 127                         data = null;
 128                 }
 129
 130                 return jQuery.ajax({
 131                         type: "GET",
 132                         url: url,
 133                         data: data,
 134                         success: callback,
 135                         dataType: type
 136                 });
 137         },
 138
 139         getScript: function( url, callback ) {
 140                 return jQuery.get(url, null, callback, "script");
 141         },
 142
 143         getJSON: function( url, data, callback ) {
 144                 return jQuery.get(url, data, callback, "json");
 145         },
 146
 147         post: function( url, data, callback, type ) {
 148                 // shift arguments if data argument was omited
 149                 if ( jQuery.isFunction( data ) ) {
 150                         type = type || callback;
 151                         callback = data;
 152                         data = {};
 153                 }
 154
 155                 return jQuery.ajax({
 156                         type: "POST",
 157                         url: url,
 158                         data: data,
 159                         success: callback,
 160                         dataType: type
 161                 });
 162         },
 163
 164         ajaxSetup: function( settings ) {
 165                 jQuery.extend( jQuery.ajaxSettings, settings );
 166         },
 167
 168         ajaxSettings: {
 169                 url: location.href,
 170                 global: true,
 171                 type: "GET",
 172                 contentType: "application/x-www-form-urlencoded",
 173                 processData: true,
 174                 async: true,
 175                 /*
 176                 timeout: 0,
 177                 data: null,
 178                 username: null,
 179                 password: null,
 180                 traditional: false,
 181                 */
 182                 // Create the request object; Microsoft failed to properly
 183                 // implement the XMLHttpRequest in IE7 (can't request local files),
 184                 // so we use the ActiveXObject when it is available
 185                 // This function can be overriden by calling jQuery.ajaxSetup
 186                 xhr: window.XMLHttpRequest && (window.location.protocol !== "file:" || !window.ActiveXObject) ?
 187                         function() {
 188                                 return new window.XMLHttpRequest();
 189                         } :
 190                         function() {
 191                                 try {
 192                                         return new window.ActiveXObject("Microsoft.XMLHTTP");
 193                                 } catch(e) {}
 194                         },
 195                 accepts: {
 196                         xml: "application/xml, text/xml",
 197                         html: "text/html",
 198                         script: "text/javascript, application/javascript",
 199                         json: "application/json, text/javascript",
 200                         text: "text/plain",
 201                         _default: "*/*"
 202                 }
 203         },
 204
 205         ajax: function( origSettings ) {
 206                 var s = jQuery.extend(true, {}, jQuery.ajaxSettings, origSettings),
 207                         jsonp, status, data, type = s.type.toUpperCase();
 208
 209                 s.url = s.url.replace( rhash, "" );
 210
 211                 // Use original (not extended) context object if it was provided
 212                 s.context = origSettings && origSettings.context != null ? origSettings.context : s;
 213
 214                 // convert data if not already a string
 215                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 216                         s.data = jQuery.param( s.data, s.traditional );
 217                 }
 218
 219                 // Handle JSONP Parameter Callbacks
 220                 if ( s.dataType === "jsonp" ) {
 221                         if ( type === "GET" ) {
 222                                 if ( !jsre.test( s.url ) ) {
 223                                         s.url += (rquery.test( s.url ) ? "&" : "?") + (s.jsonp || "callback") + "=?";
 224                                 }
 225                         } else if ( !s.data || !jsre.test(s.data) ) {
 226                                 s.data = (s.data ? s.data + "&" : "") + (s.jsonp || "callback") + "=?";
 227                         }
 228                         s.dataType = "json";
 229                 }
 230
 231                 // Build temporary JSONP function
 232                 if ( s.dataType === "json" && (s.data && jsre.test(s.data) || jsre.test(s.url)) ) {
 233                         jsonp = s.jsonpCallback || ("jsonp" + jsc++);
 234
 235                         // Replace the =? sequence both in the query string and the data
 236                         if ( s.data ) {
 237                                 s.data = (s.data + "").replace(jsre, "=" + jsonp + "$1");
 238                         }
 239
 240                         s.url = s.url.replace(jsre, "=" + jsonp + "$1");
 241
 242                         // We need to make sure
 243                         // that a JSONP style response is executed properly
 244                         s.dataType = "script";
 245
 246                         // Handle JSONP-style loading
 247                         var customJsonp = window[ jsonp ];
 248
 249                         window[ jsonp ] = function( tmp ) {
 250                                 data = tmp;
 251                                 jQuery.ajax.handleSuccess( s, xhr, status, data );
 252                                 jQuery.ajax.handleComplete( s, xhr, status, data );
 253
 254                                 if ( jQuery.isFunction( customJsonp ) ) {
 255                                         customJsonp( tmp );
 256
 257                                 } else {
 258                                         // Garbage collect
 259                                         window[ jsonp ] = undefined;
 260
 261                                         try {
 262                                                 delete window[ jsonp ];
 263                                         } catch( jsonpError ) {}
 264                                 }
 265
 266                                 if ( head ) {
 267                                         head.removeChild( script );
 268                                 }
 269                         };
 270                 }
 271
 272                 if ( s.dataType === "script" && s.cache === null ) {
 273                         s.cache = false;
 274                 }
 275
 276                 if ( s.cache === false && type === "GET" ) {
 277                         var ts = jQuery.now();
 278
 279                         // try replacing _= if it is there
 280                         var ret = s.url.replace(rts, "$1_=" + ts + "$2");
 281
 282                         // if nothing was replaced, add timestamp to the end
 283                         s.url = ret + ((ret === s.url) ? (rquery.test(s.url) ? "&" : "?") + "_=" + ts : "");
 284                 }
 285
 286                 // If data is available, append data to url for get requests
 287                 if ( s.data && type === "GET" ) {
 288                         s.url += (rquery.test(s.url) ? "&" : "?") + s.data;
 289                 }
 290
 291                 // Watch for a new set of requests
 292                 if ( s.global && jQuery.ajax.active++ === 0 ) {
 293                         jQuery.event.trigger( "ajaxStart" );
 294                 }
 295
 296                 // Matches an absolute URL, and saves the domain
 297                 var parts = rurl.exec( s.url ),
 298                         remote = parts && (parts[1] && parts[1] !== location.protocol || parts[2] !== location.host);
 299
 300                 // If we're requesting a remote document
 301                 // and trying to load JSON or Script with a GET
 302                 if ( s.dataType === "script" && type === "GET" && remote ) {
 303                         var head = document.getElementsByTagName("head")[0] || document.documentElement;
 304                         var script = document.createElement("script");
 305                         if ( s.scriptCharset ) {
 306                                 script.charset = s.scriptCharset;
 307                         }
 308                         script.src = s.url;
 309
 310                         // Handle Script loading
 311                         if ( !jsonp ) {
 312                                 var done = false;
 313
 314                                 // Attach handlers for all browsers
 315                                 script.onload = script.onreadystatechange = function() {
 316                                         if ( !done && (!this.readyState ||
 317                                                         this.readyState === "loaded" || this.readyState === "complete") ) {
 318                                                 done = true;
 319                                                 jQuery.ajax.handleSuccess( s, xhr, status, data );
 320                                                 jQuery.ajax.handleComplete( s, xhr, status, data );
 321
 322                                                 // Handle memory leak in IE
 323                                                 script.onload = script.onreadystatechange = null;
 324                                                 if ( head && script.parentNode ) {
 325                                                         head.removeChild( script );
 326                                                 }
 327                                         }
 328                                 };
 329                         }
 330
 331                         // Use insertBefore instead of appendChild  to circumvent an IE6 bug.
 332                         // This arises when a base node is used (#2709 and #4378).
 333                         head.insertBefore( script, head.firstChild );
 334
 335                         // We handle everything using the script element injection
 336                         return undefined;
 337                 }
 338
 339                 var requestDone = false;
 340
 341                 // Create the request object
 342                 var xhr = s.xhr();
 343
 344                 if ( !xhr ) {
 345                         return;
 346                 }
 347
 348                 // Open the socket
 349                 // Passing null username, generates a login popup on Opera (#2865)
 350                 if ( s.username ) {
 351                         xhr.open(type, s.url, s.async, s.username, s.password);
 352                 } else {
 353                         xhr.open(type, s.url, s.async);
 354                 }
 355
 356                 // Need an extra try/catch for cross domain requests in Firefox 3
 357                 try {
 358                         // Set the correct header, if data is being sent
 359                         if ( s.data || origSettings && origSettings.contentType ) {
 360                                 xhr.setRequestHeader("Content-Type", s.contentType);
 361                         }
 362
 363                         // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 364                         if ( s.ifModified ) {
 365                                 if ( jQuery.lastModified[s.url] ) {
 366                                         xhr.setRequestHeader("If-Modified-Since", jQuery.lastModified[s.url]);
 367                                 }
 368
 369                                 if ( jQuery.ajax.etag[s.url] ) {
 370                                         xhr.setRequestHeader("If-None-Match", jQuery.ajax.etag[s.url]);
 371                                 }
 372                         }
 373
 374                         // Set header so the called script knows that it's an XMLHttpRequest
 375                         // Only send the header if it's not a remote XHR
 376                         if ( !remote ) {
 377                                 xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
 378                         }
 379
 380                         // Set the Accepts header for the server, depending on the dataType
 381                         xhr.setRequestHeader("Accept", s.dataType && s.accepts[ s.dataType ] ?
 382                                 s.accepts[ s.dataType ] + ", */*; q=0.01" :
 383                                 s.accepts._default );
 384                 } catch( headerError ) {}
 385
 386                 // Allow custom headers/mimetypes and early abort
 387                 if ( s.beforeSend && s.beforeSend.call(s.context, xhr, s) === false ) {
 388                         // Handle the global AJAX counter
 389                         if ( s.global && jQuery.ajax.active-- === 1 ) {
 390                                 jQuery.event.trigger( "ajaxStop" );
 391                         }
 392
 393                         // close opended socket
 394                         xhr.abort();
 395                         return false;
 396                 }
 397
 398                 if ( s.global ) {
 399                         jQuery.ajax.triggerGlobal( s, "ajaxSend", [xhr, s] );
 400                 }
 401
 402                 // Wait for a response to come back
 403                 var onreadystatechange = xhr.onreadystatechange = function( isTimeout ) {
 404                         // The request was aborted
 405                         if ( !xhr || xhr.readyState === 0 || isTimeout === "abort" ) {
 406                                 // Opera doesn't call onreadystatechange before this point
 407                                 // so we simulate the call
 408                                 if ( !requestDone ) {
 409                                         jQuery.ajax.handleComplete( s, xhr, status, data );
 410                                 }
 411
 412                                 requestDone = true;
 413                                 if ( xhr ) {
 414                                         xhr.onreadystatechange = jQuery.noop;
 415                                 }
 416
 417                         // The transfer is complete and the data is available, or the request timed out
 418                         } else if ( !requestDone && xhr && (xhr.readyState === 4 || isTimeout === "timeout") ) {
 419                                 requestDone = true;
 420                                 xhr.onreadystatechange = jQuery.noop;
 421
 422                                 status = isTimeout === "timeout" ?
 423                                         "timeout" :
 424                                         !jQuery.ajax.httpSuccess( xhr ) ?
 425                                                 "error" :
 426                                                 s.ifModified && jQuery.ajax.httpNotModified( xhr, s.url ) ?
 427                                                         "notmodified" :
 428                                                         "success";
 429
 430                                 var errMsg;
 431
 432                                 if ( status === "success" ) {
 433                                         // Watch for, and catch, XML document parse errors
 434                                         try {
 435                                                 // process the data (runs the xml through httpData regardless of callback)
 436                                                 data = jQuery.ajax.httpData( xhr, s.dataType, s );
 437                                         } catch( parserError ) {
 438                                                 status = "parsererror";
 439                                                 errMsg = parserError;
 440                                         }
 441                                 }
 442
 443                                 // Make sure that the request was successful or notmodified
 444                                 if ( status === "success" || status === "notmodified" ) {
 445                                         // JSONP handles its own success callback
 446                                         if ( !jsonp ) {
 447                                                 jQuery.ajax.handleSuccess( s, xhr, status, data );
 448                                         }
 449                                 } else {
 450                                         jQuery.ajax.handleError( s, xhr, status, errMsg );
 451                                 }
 452
 453                                 // Fire the complete handlers
 454                                 if ( !jsonp ) {
 455                                         jQuery.ajax.handleComplete( s, xhr, status, data );
 456                                 }
 457
 458                                 if ( isTimeout === "timeout" ) {
 459                                         xhr.abort();
 460                                 }
 461
 462                                 // Stop memory leaks
 463                                 if ( s.async ) {
 464                                         xhr = null;
 465                                 }
 466                         }
 467                 };
 468
 469                 // Override the abort handler, if we can (IE doesn't allow it, but that's OK)
 470                 // Opera doesn't fire onreadystatechange at all on abort
 471                 try {
 472                         var oldAbort = xhr.abort;
 473                         xhr.abort = function() {
 474                                 if ( xhr ) {
 475                                         oldAbort.call( xhr );
 476                                 }
 477
 478                                 onreadystatechange( "abort" );
 479                         };
 480                 } catch( abortError ) {}
 481
 482                 // Timeout checker
 483                 if ( s.async && s.timeout > 0 ) {
 484                         setTimeout(function() {
 485                                 // Check to see if the request is still happening
 486                                 if ( xhr && !requestDone ) {
 487                                         onreadystatechange( "timeout" );
 488                                 }
 489                         }, s.timeout);
 490                 }
 491
 492                 // Send the data
 493                 try {
 494                         xhr.send( (type !== "GET" && s.data) || null );
 495
 496                 } catch( sendError ) {
 497                         jQuery.ajax.handleError( s, xhr, null, e );
 498
 499                         // Fire the complete handlers
 500                         jQuery.ajax.handleComplete( s, xhr, status, data );
 501                 }
 502
 503                 // firefox 1.5 doesn't fire statechange for sync requests
 504                 if ( !s.async ) {
 505                         onreadystatechange();
 506                 }
 507
 508                 // return XMLHttpRequest to allow aborting the request etc.
 509                 return xhr;
 510         },
 511
 512         // Serialize an array of form elements or a set of
 513         // key/values into a query string
 514         param: function( a, traditional ) {
 515                 var s = [], add = function( key, value ) {
 516                         // If value is a function, invoke it and return its value
 517                         value = jQuery.isFunction(value) ? value() : value;
 518                         s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 519                 };
 520
 521                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 522                 if ( traditional === undefined ) {
 523                         traditional = jQuery.ajaxSettings.traditional;
 524                 }
 525
 526                 // If an array was passed in, assume that it is an array of form elements.
 527                 if ( jQuery.isArray(a) || a.jquery ) {
 528                         // Serialize the form elements
 529                         jQuery.each( a, function() {
 530                                 add( this.name, this.value );
 531                         });
 532
 533                 } else {
 534                         // If traditional, encode the "old" way (the way 1.3.2 or older
 535                         // did it), otherwise encode params recursively.
 536                         for ( var prefix in a ) {
 537                                 buildParams( prefix, a[prefix], traditional, add );
 538                         }
 539                 }
 540
 541                 // Return the resulting serialization
 542                 return s.join("&").replace(r20, "+");
 543         }
 544 });
 545
 546 function buildParams( prefix, obj, traditional, add ) {
 547         if ( jQuery.isArray(obj) && obj.length ) {
 548                 // Serialize array item.
 549                 jQuery.each( obj, function( i, v ) {
 550                         if ( traditional || rbracket.test( prefix ) ) {
 551                                 // Treat each array item as a scalar.
 552                                 add( prefix, v );
 553
 554                         } else {
 555                                 // If array item is non-scalar (array or object), encode its
 556                                 // numeric index to resolve deserialization ambiguity issues.
 557                                 // Note that rack (as of 1.0.0) can't currently deserialize
 558                                 // nested arrays properly, and attempting to do so may cause
 559                                 // a server error. Possible fixes are to modify rack's
 560                                 // deserialization algorithm or to provide an option or flag
 561                                 // to force array serialization to be shallow.
 562                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 563                         }
 564                 });
 565
 566         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 567                 if ( jQuery.isEmptyObject( obj ) ) {
 568                         add( prefix, "" );
 569
 570                 // Serialize object item.
 571                 } else {
 572                         jQuery.each( obj, function( k, v ) {
 573                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 574                         });
 575                 }
 576
 577         } else {
 578                 // Serialize scalar item.
 579                 add( prefix, obj );
 580         }
 581 }
 582
 583 jQuery.extend( jQuery.ajax, {
 584
 585         // Counter for holding the number of active queries
 586         active: 0,
 587
 588         // Last-Modified header cache for next request
 589         lastModified: {},
 590         etag: {},
 591
 592         handleError: function( s, xhr, status, e ) {
 593                 // If a local callback was specified, fire it
 594                 if ( s.error ) {
 595                         s.error.call( s.context, xhr, status, e );
 596                 }
 597
 598                 // Fire the global callback
 599                 if ( s.global ) {
 600                         jQuery.ajax.triggerGlobal( s, "ajaxError", [xhr, s, e] );
 601                 }
 602         },
 603
 604         handleSuccess: function( s, xhr, status, data ) {
 605                 // If a local callback was specified, fire it and pass it the data
 606                 if ( s.success ) {
 607                         s.success.call( s.context, data, status, xhr );
 608                 }
 609
 610                 // Fire the global callback
 611                 if ( s.global ) {
 612                         jQuery.ajax.triggerGlobal( s, "ajaxSuccess", [xhr, s] );
 613                 }
 614         },
 615
 616         handleComplete: function( s, xhr, status ) {
 617                 // Process result
 618                 if ( s.complete ) {
 619                         s.complete.call( s.context, xhr, status );
 620                 }
 621
 622                 // The request was completed
 623                 if ( s.global ) {
 624                         jQuery.ajax.triggerGlobal( s, "ajaxComplete", [xhr, s] );
 625                 }
 626
 627                 // Handle the global AJAX counter
 628                 if ( s.global && jQuery.ajax.active-- === 1 ) {
 629                         jQuery.event.trigger( "ajaxStop" );
 630                 }
 631         },
 632
 633         triggerGlobal: function( s, type, args ) {
 634                 (s.context && s.context.url == null ? jQuery(s.context) : jQuery.event).trigger(type, args);
 635         },
 636
 637         // Determines if an XMLHttpRequest was successful or not
 638         httpSuccess: function( xhr ) {
 639                 try {
 640                         // IE error sometimes returns 1223 when it should be 204 so treat it as success, see #1450
 641                         return !xhr.status && location.protocol === "file:" ||
 642                                 xhr.status >= 200 && xhr.status < 300 ||
 643                                 xhr.status === 304 || xhr.status === 1223;
 644                 } catch(e) {}
 645
 646                 return false;
 647         },
 648
 649         // Determines if an XMLHttpRequest returns NotModified
 650         httpNotModified: function( xhr, url ) {
 651                 var lastModified = xhr.getResponseHeader("Last-Modified"),
 652                         etag = xhr.getResponseHeader("Etag");
 653
 654                 if ( lastModified ) {
 655                         jQuery.ajax.lastModified[url] = lastModified;
 656                 }
 657
 658                 if ( etag ) {
 659                         jQuery.ajax.etag[url] = etag;
 660                 }
 661
 662                 return xhr.status === 304;
 663         },
 664
 665         httpData: function( xhr, type, s ) {
 666                 var ct = xhr.getResponseHeader("content-type") || "",
 667                         xml = type === "xml" || !type && ct.indexOf("xml") >= 0,
 668                         data = xml ? xhr.responseXML : xhr.responseText;
 669
 670                 if ( xml && data.documentElement.nodeName === "parsererror" ) {
 671                         jQuery.error( "parsererror" );
 672                 }
 673
 674                 // Allow a pre-filtering function to sanitize the response
 675                 // s is checked to keep backwards compatibility
 676                 if ( s && s.dataFilter ) {
 677                         data = s.dataFilter( data, type );
 678                 }
 679
 680                 // The filter can actually parse the response
 681                 if ( typeof data === "string" ) {
 682                         // Get the JavaScript object, if JSON is used.
 683                         if ( type === "json" || !type && ct.indexOf("json") >= 0 ) {
 684                                 data = jQuery.parseJSON( data );
 685
 686                         // If the type is "script", eval it in global context
 687                         } else if ( type === "script" || !type && ct.indexOf("javascript") >= 0 ) {
 688                                 jQuery.globalEval( data );
 689                         }
 690                 }
 691
 692                 return data;
 693         }
 694
 695 });
 696
 697 // Does this browser support XHR requests?
 698 jQuery.support.ajax = !!jQuery.ajaxSettings.xhr();
 699
 700 // For backwards compatibility
 701 jQuery.extend( jQuery.ajax );
 702
 703 })( jQuery );