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)$/i,
   7         rnoContent = /^(?:GET|HEAD)$/,
   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                 // This function can be overriden by calling jQuery.ajaxSetup
 184                 xhr: function() {
 185                         return new window.XMLHttpRequest();
 186                 },
 187                 accepts: {
 188                         xml: "application/xml, text/xml",
 189                         html: "text/html",
 190                         script: "text/javascript, application/javascript",
 191                         json: "application/json, text/javascript",
 192                         text: "text/plain",
 193                         _default: "*/*"
 194                 }
 195         },
 196
 197         ajax: function( origSettings ) {
 198                 var s = jQuery.extend(true, {}, jQuery.ajaxSettings, origSettings),
 199                         jsonp, status, data, type = s.type.toUpperCase(), noContent = rnoContent.test(type);
 200
 201                 // toString fixes people passing a window.location or
 202                 // document.location to $.ajax, which worked in 1.4.2 and
 203                 // earlier (bug #7531). It should be removed in 1.5.
 204                 s.url = s.url.toString().replace( rhash, "" );
 205
 206                 // Use original (not extended) context object if it was provided
 207                 s.context = origSettings && origSettings.context != null ? origSettings.context : s;
 208
 209                 // convert data if not already a string
 210                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 211                         s.data = jQuery.param( s.data, s.traditional );
 212                 }
 213
 214                 // Handle JSONP Parameter Callbacks
 215                 if ( s.dataType === "jsonp" ) {
 216                         if ( type === "GET" ) {
 217                                 if ( !jsre.test( s.url ) ) {
 218                                         s.url += (rquery.test( s.url ) ? "&" : "?") + (s.jsonp || "callback") + "=?";
 219                                 }
 220                         } else if ( !s.data || !jsre.test(s.data) ) {
 221                                 s.data = (s.data ? s.data + "&" : "") + (s.jsonp || "callback") + "=?";
 222                         }
 223                         s.dataType = "json";
 224                 }
 225
 226                 // Build temporary JSONP function
 227                 if ( s.dataType === "json" && (s.data && jsre.test(s.data) || jsre.test(s.url)) ) {
 228                         jsonp = s.jsonpCallback || ("jsonp" + jsc++);
 229
 230                         // Replace the =? sequence both in the query string and the data
 231                         if ( s.data ) {
 232                                 s.data = (s.data + "").replace(jsre, "=" + jsonp + "$1");
 233                         }
 234
 235                         s.url = s.url.replace(jsre, "=" + jsonp + "$1");
 236
 237                         // We need to make sure
 238                         // that a JSONP style response is executed properly
 239                         s.dataType = "script";
 240
 241                         // Handle JSONP-style loading
 242                         var customJsonp = window[ jsonp ];
 243
 244                         window[ jsonp ] = function( tmp ) {
 245                                 if ( jQuery.isFunction( customJsonp ) ) {
 246                                         customJsonp( tmp );
 247
 248                                 } else {
 249                                         // Garbage collect
 250                                         window[ jsonp ] = undefined;
 251
 252                                         try {
 253                                                 delete window[ jsonp ];
 254                                         } catch( jsonpError ) {}
 255                                 }
 256
 257                                 data = tmp;
 258                                 jQuery.handleSuccess( s, xhr, status, data );
 259                                 jQuery.handleComplete( s, xhr, status, data );
 260
 261                                 if ( head ) {
 262                                         head.removeChild( script );
 263                                 }
 264                         };
 265                 }
 266
 267                 if ( s.dataType === "script" && s.cache === null ) {
 268                         s.cache = false;
 269                 }
 270
 271                 if ( s.cache === false && noContent ) {
 272                         var ts = jQuery.now();
 273
 274                         // try replacing _= if it is there
 275                         var ret = s.url.replace(rts, "$1_=" + ts);
 276
 277                         // if nothing was replaced, add timestamp to the end
 278                         s.url = ret + ((ret === s.url) ? (rquery.test(s.url) ? "&" : "?") + "_=" + ts : "");
 279                 }
 280
 281                 // If data is available, append data to url for GET/HEAD requests
 282                 if ( s.data && noContent ) {
 283                         s.url += (rquery.test(s.url) ? "&" : "?") + s.data;
 284                 }
 285
 286                 // Watch for a new set of requests
 287                 if ( s.global && jQuery.active++ === 0 ) {
 288                         jQuery.event.trigger( "ajaxStart" );
 289                 }
 290
 291                 // Matches an absolute URL, and saves the domain
 292                 var parts = rurl.exec( s.url ),
 293                         remote = parts && (parts[1] && parts[1].toLowerCase() !== location.protocol || parts[2].toLowerCase() !== location.host);
 294
 295                 // If we're requesting a remote document
 296                 // and trying to load JSON or Script with a GET
 297                 if ( s.dataType === "script" && type === "GET" && remote ) {
 298                         var head = document.getElementsByTagName("head")[0] || document.documentElement;
 299                         var script = document.createElement("script");
 300                         if ( s.scriptCharset ) {
 301                                 script.charset = s.scriptCharset;
 302                         }
 303                         script.src = s.url;
 304
 305                         // Handle Script loading
 306                         if ( !jsonp ) {
 307                                 var done = false;
 308
 309                                 // Attach handlers for all browsers
 310                                 script.onload = script.onreadystatechange = function() {
 311                                         if ( !done && (!this.readyState ||
 312                                                         this.readyState === "loaded" || this.readyState === "complete") ) {
 313                                                 done = true;
 314                                                 jQuery.handleSuccess( s, xhr, status, data );
 315                                                 jQuery.handleComplete( s, xhr, status, data );
 316
 317                                                 // Handle memory leak in IE
 318                                                 script.onload = script.onreadystatechange = null;
 319                                                 if ( head && script.parentNode ) {
 320                                                         head.removeChild( script );
 321                                                 }
 322                                         }
 323                                 };
 324                         }
 325
 326                         // Use insertBefore instead of appendChild  to circumvent an IE6 bug.
 327                         // This arises when a base node is used (#2709 and #4378).
 328                         head.insertBefore( script, head.firstChild );
 329
 330                         // We handle everything using the script element injection
 331                         return undefined;
 332                 }
 333
 334                 var requestDone = false;
 335
 336                 // Create the request object
 337                 var xhr = s.xhr();
 338
 339                 if ( !xhr ) {
 340                         return;
 341                 }
 342
 343                 // Open the socket
 344                 // Passing null username, generates a login popup on Opera (#2865)
 345                 if ( s.username ) {
 346                         xhr.open(type, s.url, s.async, s.username, s.password);
 347                 } else {
 348                         xhr.open(type, s.url, s.async);
 349                 }
 350
 351                 // Need an extra try/catch for cross domain requests in Firefox 3
 352                 try {
 353                         // Set content-type if data specified and content-body is valid for this type
 354                         if ( (s.data != null && !noContent) || (origSettings && origSettings.contentType) ) {
 355                                 xhr.setRequestHeader("Content-Type", s.contentType);
 356                         }
 357
 358                         // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 359                         if ( s.ifModified ) {
 360                                 if ( jQuery.lastModified[s.url] ) {
 361                                         xhr.setRequestHeader("If-Modified-Since", jQuery.lastModified[s.url]);
 362                                 }
 363
 364                                 if ( jQuery.etag[s.url] ) {
 365                                         xhr.setRequestHeader("If-None-Match", jQuery.etag[s.url]);
 366                                 }
 367                         }
 368
 369                         // Set header so the called script knows that it's an XMLHttpRequest
 370                         // Only send the header if it's not a remote XHR
 371                         if ( !remote ) {
 372                                 xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
 373                         }
 374
 375                         // Set the Accepts header for the server, depending on the dataType
 376                         xhr.setRequestHeader("Accept", s.dataType && s.accepts[ s.dataType ] ?
 377                                 s.accepts[ s.dataType ] + ", */*; q=0.01" :
 378                                 s.accepts._default );
 379                 } catch( headerError ) {}
 380
 381                 // Allow custom headers/mimetypes and early abort
 382                 if ( s.beforeSend && s.beforeSend.call(s.context, xhr, s) === false ) {
 383                         // Handle the global AJAX counter
 384                         if ( s.global && jQuery.active-- === 1 ) {
 385                                 jQuery.event.trigger( "ajaxStop" );
 386                         }
 387
 388                         // close opended socket
 389                         xhr.abort();
 390                         return false;
 391                 }
 392
 393                 if ( s.global ) {
 394                         jQuery.triggerGlobal( s, "ajaxSend", [xhr, s] );
 395                 }
 396
 397                 // Wait for a response to come back
 398                 var onreadystatechange = xhr.onreadystatechange = function( isTimeout ) {
 399                         // The request was aborted
 400                         if ( !xhr || xhr.readyState === 0 || isTimeout === "abort" ) {
 401                                 // Opera doesn't call onreadystatechange before this point
 402                                 // so we simulate the call
 403                                 if ( !requestDone ) {
 404                                         jQuery.handleComplete( s, xhr, status, data );
 405                                 }
 406
 407                                 requestDone = true;
 408                                 if ( xhr ) {
 409                                         xhr.onreadystatechange = jQuery.noop;
 410                                 }
 411
 412                         // The transfer is complete and the data is available, or the request timed out
 413                         } else if ( !requestDone && xhr && (xhr.readyState === 4 || isTimeout === "timeout") ) {
 414                                 requestDone = true;
 415                                 xhr.onreadystatechange = jQuery.noop;
 416
 417                                 status = isTimeout === "timeout" ?
 418                                         "timeout" :
 419                                         !jQuery.httpSuccess( xhr ) ?
 420                                                 "error" :
 421                                                 s.ifModified && jQuery.httpNotModified( xhr, s.url ) ?
 422                                                         "notmodified" :
 423                                                         "success";
 424
 425                                 var errMsg;
 426
 427                                 if ( status === "success" ) {
 428                                         // Watch for, and catch, XML document parse errors
 429                                         try {
 430                                                 // process the data (runs the xml through httpData regardless of callback)
 431                                                 data = jQuery.httpData( xhr, s.dataType, s );
 432                                         } catch( parserError ) {
 433                                                 status = "parsererror";
 434                                                 errMsg = parserError;
 435                                         }
 436                                 }
 437
 438                                 // Make sure that the request was successful or notmodified
 439                                 if ( status === "success" || status === "notmodified" ) {
 440                                         // JSONP handles its own success callback
 441                                         if ( !jsonp ) {
 442                                                 jQuery.handleSuccess( s, xhr, status, data );
 443                                         }
 444                                 } else {
 445                                         jQuery.handleError( s, xhr, status, errMsg );
 446                                 }
 447
 448                                 // Fire the complete handlers
 449                                 if ( !jsonp ) {
 450                                         jQuery.handleComplete( s, xhr, status, data );
 451                                 }
 452
 453                                 if ( isTimeout === "timeout" ) {
 454                                         xhr.abort();
 455                                 }
 456
 457                                 // Stop memory leaks
 458                                 if ( s.async ) {
 459                                         xhr = null;
 460                                 }
 461                         }
 462                 };
 463
 464                 // Override the abort handler, if we can (IE 6 doesn't allow it, but that's OK)
 465                 // Opera doesn't fire onreadystatechange at all on abort
 466                 try {
 467                         var oldAbort = xhr.abort;
 468                         xhr.abort = function() {
 469                                 if ( xhr ) {
 470                                         // oldAbort has no call property in IE7 so
 471                                         // just do it this way, which works in all
 472                                         // browsers
 473                                         Function.prototype.call.call( oldAbort, xhr );
 474                                 }
 475
 476                                 onreadystatechange( "abort" );
 477                         };
 478                 } catch( abortError ) {}
 479
 480                 // Timeout checker
 481                 if ( s.async && s.timeout > 0 ) {
 482                         setTimeout(function() {
 483                                 // Check to see if the request is still happening
 484                                 if ( xhr && !requestDone ) {
 485                                         onreadystatechange( "timeout" );
 486                                 }
 487                         }, s.timeout);
 488                 }
 489
 490                 // Send the data
 491                 try {
 492                         xhr.send( noContent || s.data == null ? null : s.data );
 493
 494                 } catch( sendError ) {
 495                         jQuery.handleError( s, xhr, null, sendError );
 496
 497                         // Fire the complete handlers
 498                         jQuery.handleComplete( s, xhr, status, data );
 499                 }
 500
 501                 // firefox 1.5 doesn't fire statechange for sync requests
 502                 if ( !s.async ) {
 503                         onreadystatechange();
 504                 }
 505
 506                 // return XMLHttpRequest to allow aborting the request etc.
 507                 return xhr;
 508         },
 509
 510         // Serialize an array of form elements or a set of
 511         // key/values into a query string
 512         param: function( a, traditional ) {
 513                 var s = [],
 514                         add = function( key, value ) {
 515                                 // If value is a function, invoke it and return its value
 516                                 value = jQuery.isFunction(value) ? value() : value;
 517                                 s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 518                         };
 519
 520                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 521                 if ( traditional === undefined ) {
 522                         traditional = jQuery.ajaxSettings.traditional;
 523                 }
 524
 525                 // If an array was passed in, assume that it is an array of form elements.
 526                 if ( jQuery.isArray(a) || a.jquery ) {
 527                         // Serialize the form elements
 528                         jQuery.each( a, function() {
 529                                 add( this.name, this.value );
 530                         });
 531
 532                 } else {
 533                         // If traditional, encode the "old" way (the way 1.3.2 or older
 534                         // did it), otherwise encode params recursively.
 535                         for ( var prefix in a ) {
 536                                 buildParams( prefix, a[prefix], traditional, add );
 537                         }
 538                 }
 539
 540                 // Return the resulting serialization
 541                 return s.join("&").replace(r20, "+");
 542         }
 543 });
 544
 545 function buildParams( prefix, obj, traditional, add ) {
 546         if ( jQuery.isArray(obj) && obj.length ) {
 547                 // Serialize array item.
 548                 jQuery.each( obj, function( i, v ) {
 549                         if ( traditional || rbracket.test( prefix ) ) {
 550                                 // Treat each array item as a scalar.
 551                                 add( prefix, v );
 552
 553                         } else {
 554                                 // If array item is non-scalar (array or object), encode its
 555                                 // numeric index to resolve deserialization ambiguity issues.
 556                                 // Note that rack (as of 1.0.0) can't currently deserialize
 557                                 // nested arrays properly, and attempting to do so may cause
 558                                 // a server error. Possible fixes are to modify rack's
 559                                 // deserialization algorithm or to provide an option or flag
 560                                 // to force array serialization to be shallow.
 561                                 buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
 562                         }
 563                 });
 564
 565         } else if ( !traditional && obj != null && typeof obj === "object" ) {
 566                 if ( jQuery.isEmptyObject( obj ) ) {
 567                         add( prefix, "" );
 568
 569                 // Serialize object item.
 570                 } else {
 571                         jQuery.each( obj, function( k, v ) {
 572                                 buildParams( prefix + "[" + k + "]", v, traditional, add );
 573                         });
 574                 }
 575
 576         } else {
 577                 // Serialize scalar item.
 578                 add( prefix, obj );
 579         }
 580 }
 581
 582 // This is still on the jQuery object... for now
 583 // Want to move this to jQuery.ajax some day
 584 jQuery.extend({
 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.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.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.triggerGlobal( s, "ajaxComplete", [xhr, s] );
 626                 }
 627
 628                 // Handle the global AJAX counter
 629                 if ( s.global && jQuery.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.lastModified[url] = lastModified;
 657                 }
 658
 659                 if ( etag ) {
 660                         jQuery.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 /*
 699  * Create the request object; Microsoft failed to properly
 700  * implement the XMLHttpRequest in IE7 (can't request local files),
 701  * so we use the ActiveXObject when it is available
 702  * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
 703  * we need a fallback.
 704  */
 705 if ( window.ActiveXObject ) {
 706         jQuery.ajaxSettings.xhr = function() {
 707                 if ( window.location.protocol !== "file:" ) {
 708                         try {
 709                                 return new window.XMLHttpRequest();
 710                         } catch(xhrError) {}
 711                 }
 712
 713                 try {
 714                         return new window.ActiveXObject("Microsoft.XMLHTTP");
 715                 } catch(activeError) {}
 716         };
 717 }
 718
 719 // Does this browser support XHR requests?
 720 jQuery.support.ajax = !!jQuery.ajaxSettings.xhr();
 721
 722 })( jQuery );