src/ajax.js

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