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 jQuery.fn.extend({
  12         // Keep a copy of the old load
  13         _load: jQuery.fn.load,
  14
  15         load: function( url, params, callback ) {
  16                 if ( typeof url !== "string" ) {
  17                         return this._load( url );
  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                 // Request the remote document
  49                 jQuery.ajax({
  50                         url: url,
  51                         type: type,
  52                         dataType: "html",
  53                         data: params,
  54                         context:this,
  55                         complete: function( res, status ) {
  56                                 // If successful, inject the HTML into all the matched elements
  57                                 if ( status === "success" || status === "notmodified" ) {
  58                                         // See if a selector was specified
  59                                         this.html( selector ?
  60                                                 // Create a dummy div to hold the results
  61                                                 jQuery("<div />")
  62                                                         // inject the contents of the document in, removing the scripts
  63                                                         // to avoid any 'Permission Denied' errors in IE
  64                                                         .append(res.responseText.replace(rscript, ""))
  65
  66                                                         // Locate the specified elements
  67                                                         .find(selector) :
  68
  69                                                 // If not, just inject the full result
  70                                                 res.responseText );
  71                                 }
  72
  73                                 if ( callback ) {
  74                                         this.each( callback, [res.responseText, status, res] );
  75                                 }
  76                         }
  77                 });
  78
  79                 return this;
  80         },
  81
  82         serialize: function() {
  83                 return jQuery.param(this.serializeArray());
  84         },
  85         serializeArray: function() {
  86                 return this.map(function() {
  87                         return this.elements ? jQuery.makeArray(this.elements) : this;
  88                 })
  89                 .filter(function() {
  90                         return this.name && !this.disabled &&
  91                                 (this.checked || rselectTextarea.test(this.nodeName) ||
  92                                         rinput.test(this.type));
  93                 })
  94                 .map(function( i, elem ) {
  95                         var val = jQuery(this).val();
  96
  97                         return val == null ?
  98                                 null :
  99                                 jQuery.isArray(val) ?
 100                                         jQuery.map( val, function( val, i ) {
 101                                                 return { name: elem.name, value: val };
 102                                         }) :
 103                                         { name: elem.name, value: val };
 104                 }).get();
 105         }
 106 });
 107
 108 // Attach a bunch of functions for handling common AJAX events
 109 jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function( i, o ) {
 110         jQuery.fn[o] = function( f ) {
 111                 return this.bind(o, f);
 112         };
 113 });
 114
 115 jQuery.extend({
 116
 117         get: function( url, data, callback, type ) {
 118                 // shift arguments if data argument was omited
 119                 if ( jQuery.isFunction( data ) ) {
 120                         type = type || callback;
 121                         callback = data;
 122                         data = null;
 123                 }
 124
 125                 return jQuery.ajax({
 126                         type: "GET",
 127                         url: url,
 128                         data: data,
 129                         success: callback,
 130                         dataType: type
 131                 });
 132         },
 133
 134         getScript: function( url, callback ) {
 135                 return jQuery.get(url, null, callback, "script");
 136         },
 137
 138         getJSON: function( url, data, callback ) {
 139                 return jQuery.get(url, data, callback, "json");
 140         },
 141
 142         post: function( url, data, callback, type ) {
 143                 // shift arguments if data argument was omited
 144                 if ( jQuery.isFunction( data ) ) {
 145                         type = type || callback;
 146                         callback = data;
 147                         data = {};
 148                 }
 149
 150                 return jQuery.ajax({
 151                         type: "POST",
 152                         url: url,
 153                         data: data,
 154                         success: callback,
 155                         dataType: type
 156                 });
 157         },
 158
 159         ajaxSetup: function( settings ) {
 160                 jQuery.extend( jQuery.ajaxSettings, settings );
 161         },
 162
 163         ajaxSettings: {
 164                 url: location.href,
 165                 global: true,
 166                 type: "GET",
 167                 contentType: "application/x-www-form-urlencoded",
 168                 processData: true,
 169                 async: true,
 170                 /*
 171                 timeout: 0,
 172                 data: null,
 173                 username: null,
 174                 password: null,
 175                 traditional: false,
 176                 */
 177                 // Create the request object; Microsoft failed to properly
 178                 // implement the XMLHttpRequest in IE7 (can't request local files),
 179                 // so we use the ActiveXObject when it is available
 180                 // This function can be overriden by calling jQuery.ajaxSetup
 181                 xhr: window.XMLHttpRequest && (window.location.protocol !== "file:" || !window.ActiveXObject) ?
 182                         function() {
 183                                 return new window.XMLHttpRequest();
 184                         } :
 185                         function() {
 186                                 try {
 187                                         return new window.ActiveXObject("Microsoft.XMLHTTP");
 188                                 } catch(e) {}
 189                         },
 190                 accepts: {
 191                         xml: "application/xml, text/xml",
 192                         html: "text/html",
 193                         script: "text/javascript, application/javascript",
 194                         json: "application/json, text/javascript",
 195                         text: "text/plain",
 196                         _default: "*/*"
 197                 }
 198         },
 199
 200         // Last-Modified header cache for next request
 201         lastModified: {},
 202         etag: {},
 203
 204         ajax: function( origSettings ) {
 205                 var s = jQuery.extend(true, {}, jQuery.ajaxSettings, origSettings);
 206
 207                 var jsonp, status, data,
 208                         callbackContext = s.context || s,
 209                         type = s.type.toUpperCase();
 210
 211                 // convert data if not already a string
 212                 if ( s.data && s.processData && typeof s.data !== "string" ) {
 213                         s.data = jQuery.param( s.data, s.traditional );
 214                 }
 215
 216                 // Handle JSONP Parameter Callbacks
 217                 if ( s.dataType === "jsonp" ) {
 218                         if ( type === "GET" ) {
 219                                 if ( !jsre.test( s.url ) ) {
 220                                         s.url += (rquery.test( s.url ) ? "&" : "?") + (s.jsonp || "callback") + "=?";
 221                                 }
 222                         } else if ( !s.data || !jsre.test(s.data) ) {
 223                                 s.data = (s.data ? s.data + "&" : "") + (s.jsonp || "callback") + "=?";
 224                         }
 225                         s.dataType = "json";
 226                 }
 227
 228                 // Build temporary JSONP function
 229                 if ( s.dataType === "json" && (s.data && jsre.test(s.data) || jsre.test(s.url)) ) {
 230                         jsonp = s.jsonpCallback || ("jsonp" + jsc++);
 231
 232                         // Replace the =? sequence both in the query string and the data
 233                         if ( s.data ) {
 234                                 s.data = (s.data + "").replace(jsre, "=" + jsonp + "$1");
 235                         }
 236
 237                         s.url = s.url.replace(jsre, "=" + jsonp + "$1");
 238
 239                         // We need to make sure
 240                         // that a JSONP style response is executed properly
 241                         s.dataType = "script";
 242
 243                         // Handle JSONP-style loading
 244                         window[ jsonp ] = window[ jsonp ] || function( tmp ) {
 245                                 data = tmp;
 246                                 success();
 247                                 complete();
 248                                 // Garbage collect
 249                                 window[ jsonp ] = undefined;
 250
 251                                 try {
 252                                         delete window[ jsonp ];
 253                                 } catch(e) {}
 254
 255                                 if ( head ) {
 256                                         head.removeChild( script );
 257                                 }
 258                         };
 259                 }
 260
 261                 if ( s.dataType === "script" && s.cache === null ) {
 262                         s.cache = false;
 263                 }
 264
 265                 if ( s.cache === false && type === "GET" ) {
 266                         var ts = now();
 267
 268                         // try replacing _= if it is there
 269                         var ret = s.url.replace(rts, "$1_=" + ts + "$2");
 270
 271                         // if nothing was replaced, add timestamp to the end
 272                         s.url = ret + ((ret === s.url) ? (rquery.test(s.url) ? "&" : "?") + "_=" + ts : "");
 273                 }
 274
 275                 // If data is available, append data to url for get requests
 276                 if ( s.data && type === "GET" ) {
 277                         s.url += (rquery.test(s.url) ? "&" : "?") + s.data;
 278                 }
 279
 280                 // Watch for a new set of requests
 281                 if ( s.global && ! jQuery.active++ ) {
 282                         jQuery.event.trigger( "ajaxStart" );
 283                 }
 284
 285                 // Matches an absolute URL, and saves the domain
 286                 var parts = rurl.exec( s.url ),
 287                         remote = parts && (parts[1] && parts[1] !== location.protocol || parts[2] !== location.host);
 288
 289                 // If we're requesting a remote document
 290                 // and trying to load JSON or Script with a GET
 291                 if ( s.dataType === "script" && type === "GET" && remote ) {
 292                         var head = document.getElementsByTagName("head")[0] || document.documentElement;
 293                         var script = document.createElement("script");
 294                         script.src = s.url;
 295                         if ( s.scriptCharset ) {
 296                                 script.charset = s.scriptCharset;
 297                         }
 298
 299                         // Handle Script loading
 300                         if ( !jsonp ) {
 301                                 var done = false;
 302
 303                                 // Attach handlers for all browsers
 304                                 script.onload = script.onreadystatechange = function() {
 305                                         if ( !done && (!this.readyState ||
 306                                                         this.readyState === "loaded" || this.readyState === "complete") ) {
 307                                                 done = true;
 308                                                 success();
 309                                                 complete();
 310
 311                                                 // Handle memory leak in IE
 312                                                 script.onload = script.onreadystatechange = null;
 313                                                 if ( head && script.parentNode ) {
 314                                                         head.removeChild( script );
 315                                                 }
 316                                         }
 317                                 };
 318                         }
 319
 320                         // Use insertBefore instead of appendChild  to circumvent an IE6 bug.
 321                         // This arises when a base node is used (#2709 and #4378).
 322                         head.insertBefore( script, head.firstChild );
 323
 324                         // We handle everything using the script element injection
 325                         return undefined;
 326                 }
 327
 328                 var requestDone = false;
 329
 330                 // Create the request object
 331                 var xhr = s.xhr();
 332
 333                 if ( !xhr ) {
 334                         return;
 335                 }
 336
 337                 // Open the socket
 338                 // Passing null username, generates a login popup on Opera (#2865)
 339                 if ( s.username ) {
 340                         xhr.open(type, s.url, s.async, s.username, s.password);
 341                 } else {
 342                         xhr.open(type, s.url, s.async);
 343                 }
 344
 345                 // Need an extra try/catch for cross domain requests in Firefox 3
 346                 try {
 347                         // Set the correct header, if data is being sent
 348                         if ( s.data || origSettings && origSettings.contentType ) {
 349                                 xhr.setRequestHeader("Content-Type", s.contentType);
 350                         }
 351
 352                         // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 353                         if ( s.ifModified ) {
 354                                 if ( jQuery.lastModified[s.url] ) {
 355                                         xhr.setRequestHeader("If-Modified-Since", jQuery.lastModified[s.url]);
 356                                 }
 357
 358                                 if ( jQuery.etag[s.url] ) {
 359                                         xhr.setRequestHeader("If-None-Match", jQuery.etag[s.url]);
 360                                 }
 361                         }
 362
 363                         // Set header so the called script knows that it's an XMLHttpRequest
 364                         // Only send the header if it's not a remote XHR
 365                         if ( !remote ) {
 366                                 xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
 367                         }
 368
 369                         // Set the Accepts header for the server, depending on the dataType
 370                         xhr.setRequestHeader("Accept", s.dataType && s.accepts[ s.dataType ] ?
 371                                 s.accepts[ s.dataType ] + ", */*" :
 372                                 s.accepts._default );
 373                 } catch(e) {}
 374
 375                 // Allow custom headers/mimetypes and early abort
 376                 if ( s.beforeSend && s.beforeSend.call(callbackContext, xhr, s) === false ) {
 377                         // Handle the global AJAX counter
 378                         if ( s.global && ! --jQuery.active ) {
 379                                 jQuery.event.trigger( "ajaxStop" );
 380                         }
 381
 382                         // close opended socket
 383                         xhr.abort();
 384                         return false;
 385                 }
 386
 387                 if ( s.global ) {
 388                         trigger("ajaxSend", [xhr, s]);
 389                 }
 390
 391                 // Wait for a response to come back
 392                 var onreadystatechange = xhr.onreadystatechange = function( isTimeout ) {
 393                         // The request was aborted, clear the interval and decrement jQuery.active
 394                         if ( !xhr || xhr.readyState === 0 ) {
 395                                 requestDone = true;
 396                                 xhr.onreadystatechange = jQuery.noop;
 397
 398                                 // Handle the global AJAX counter
 399                                 if ( s.global && ! --jQuery.active ) {
 400                                         jQuery.event.trigger( "ajaxStop" );
 401                                 }
 402
 403                         // The transfer is complete and the data is available, or the request timed out
 404                         } else if ( !requestDone && xhr && (xhr.readyState === 4 || isTimeout === "timeout") ) {
 405                                 requestDone = true;
 406                                 xhr.onreadystatechange = jQuery.noop;
 407
 408                                 status = isTimeout === "timeout" ?
 409                                         "timeout" :
 410                                         !jQuery.httpSuccess( xhr ) ?
 411                                                 "error" :
 412                                                 s.ifModified && jQuery.httpNotModified( xhr, s.url ) ?
 413                                                         "notmodified" :
 414                                                         "success";
 415
 416                                 if ( status === "success" ) {
 417                                         // Watch for, and catch, XML document parse errors
 418                                         try {
 419                                                 // process the data (runs the xml through httpData regardless of callback)
 420                                                 data = jQuery.httpData( xhr, s.dataType, s );
 421                                         } catch(e) {
 422                                                 status = "parsererror";
 423                                         }
 424                                 }
 425
 426                                 // Make sure that the request was successful or notmodified
 427                                 if ( status === "success" || status === "notmodified" ) {
 428                                         // JSONP handles its own success callback
 429                                         if ( !jsonp ) {
 430                                                 success();
 431                                         }
 432                                 } else {
 433                                         jQuery.handleError(s, xhr, status);
 434                                 }
 435
 436                                 // Fire the complete handlers
 437                                 complete();
 438
 439                                 if ( isTimeout === "timeout" ) {
 440                                         xhr.abort();
 441                                 }
 442
 443                                 // Stop memory leaks
 444                                 if ( s.async ) {
 445                                         xhr = null;
 446                                 }
 447                         }
 448                 };
 449
 450                 // Timeout checker
 451                 if ( s.async && s.timeout > 0 ) {
 452                         setTimeout(function() {
 453                                 // Check to see if the request is still happening
 454                                 if ( xhr && !requestDone ) {
 455                                         onreadystatechange( "timeout" );
 456                                 }
 457                         }, s.timeout);
 458                 }
 459
 460                 // Send the data
 461                 try {
 462                         xhr.send( type === "POST" || type === "PUT" ? s.data : null );
 463                 } catch(e) {
 464                         jQuery.handleError(s, xhr, null, e);
 465                         // Fire the complete handlers
 466                         complete();
 467                 }
 468
 469                 // firefox 1.5 doesn't fire statechange for sync requests
 470                 if ( !s.async ) {
 471                         onreadystatechange();
 472                 }
 473
 474                 function success() {
 475                         // If a local callback was specified, fire it and pass it the data
 476                         if ( s.success ) {
 477                                 s.success.call( callbackContext, data, status, xhr );
 478                         }
 479
 480                         // Fire the global callback
 481                         if ( s.global ) {
 482                                 trigger( "ajaxSuccess", [xhr, s] );
 483                         }
 484                 }
 485
 486                 function complete() {
 487                         // Process result
 488                         if ( s.complete ) {
 489                                 s.complete.call( callbackContext, xhr, status);
 490                         }
 491
 492                         // The request was completed
 493                         if ( s.global ) {
 494                                 trigger( "ajaxComplete", [xhr, s] );
 495                         }
 496
 497                         // Handle the global AJAX counter
 498                         if ( s.global && ! --jQuery.active ) {
 499                                 jQuery.event.trigger( "ajaxStop" );
 500                         }
 501                 }
 502
 503                 function trigger(type, args) {
 504                         (s.context ? jQuery(s.context) : jQuery.event).trigger(type, args);
 505                 }
 506
 507                 // return XMLHttpRequest to allow aborting the request etc.
 508                 return xhr;
 509         },
 510
 511         handleError: function( s, xhr, status, e ) {
 512                 // If a local callback was specified, fire it
 513                 if ( s.error ) {
 514                         s.error.call( s.context || window, xhr, status, e );
 515                 }
 516
 517                 // Fire the global callback
 518                 if ( s.global ) {
 519                         (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
 520                 }
 521         },
 522
 523         // Counter for holding the number of active queries
 524         active: 0,
 525
 526         // Determines if an XMLHttpRequest was successful or not
 527         httpSuccess: function( xhr ) {
 528                 try {
 529                         // IE error sometimes returns 1223 when it should be 204 so treat it as success, see #1450
 530                         return !xhr.status && location.protocol === "file:" ||
 531                                 // Opera returns 0 when status is 304
 532                                 ( xhr.status >= 200 && xhr.status < 300 ) ||
 533                                 xhr.status === 304 || xhr.status === 1223 || xhr.status === 0;
 534                 } catch(e) {}
 535
 536                 return false;
 537         },
 538
 539         // Determines if an XMLHttpRequest returns NotModified
 540         httpNotModified: function( xhr, url ) {
 541                 var lastModified = xhr.getResponseHeader("Last-Modified"),
 542                         etag = xhr.getResponseHeader("Etag");
 543
 544                 if ( lastModified ) {
 545                         jQuery.lastModified[url] = lastModified;
 546                 }
 547
 548                 if ( etag ) {
 549                         jQuery.etag[url] = etag;
 550                 }
 551
 552                 // Opera returns 0 when status is 304
 553                 return xhr.status === 304 || xhr.status === 0;
 554         },
 555
 556         httpData: function( xhr, type, s ) {
 557                 var ct = xhr.getResponseHeader("content-type") || "",
 558                         xml = type === "xml" || !type && ct.indexOf("xml") >= 0,
 559                         data = xml ? xhr.responseXML : xhr.responseText;
 560
 561                 if ( xml && data.documentElement.nodeName === "parsererror" ) {
 562                         throw "parsererror";
 563                 }
 564
 565                 // Allow a pre-filtering function to sanitize the response
 566                 // s is checked to keep backwards compatibility
 567                 if ( s && s.dataFilter ) {
 568                         data = s.dataFilter( data, type );
 569                 }
 570
 571                 // The filter can actually parse the response
 572                 if ( typeof data === "string" ) {
 573                         // Get the JavaScript object, if JSON is used.
 574                         if ( type === "json" || !type && ct.indexOf("json") >= 0 ) {
 575                                 // Make sure the incoming data is actual JSON
 576                                 // Logic borrowed from http://json.org/json2.js
 577                                 if (/^[\],:{}\s]*$/.test(data.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, "@")
 578                                         .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, "]")
 579                                         .replace(/(?:^|:|,)(?:\s*\[)+/g, ""))) {
 580
 581                                         // Try to use the native JSON parser first
 582                                         if ( window.JSON && window.JSON.parse ) {
 583                                                 data = window.JSON.parse( data );
 584
 585                                         } else {
 586                                                 data = (new Function("return " + data))();
 587                                         }
 588
 589                                 } else {
 590                                         throw "Invalid JSON: " + data;
 591                                 }
 592
 593                         // If the type is "script", eval it in global context
 594                         } else if ( type === "script" || !type && ct.indexOf("javascript") >= 0 ) {
 595                                 jQuery.globalEval( data );
 596                         }
 597                 }
 598
 599                 return data;
 600         },
 601
 602         // Serialize an array of form elements or a set of
 603         // key/values into a query string
 604         param: function( a, traditional ) {
 605
 606                 var s = [];
 607
 608                 // Set traditional to true for jQuery <= 1.3.2 behavior.
 609                 if ( traditional === undefined ) {
 610                         traditional = jQuery.ajaxSettings.traditional;
 611                 }
 612
 613                 function add( key, value ) {
 614                         // If value is a function, invoke it and return its value
 615                         value = jQuery.isFunction(value) ? value() : value;
 616                         s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
 617                 }
 618
 619                 // If an array was passed in, assume that it is an array of form elements.
 620                 if ( jQuery.isArray(a) || a.jquery ) {
 621                         // Serialize the form elements
 622                         jQuery.each( a, function() {
 623                                 add( this.name, this.value );
 624                         });
 625
 626                 } else {
 627                         // If traditional, encode the "old" way (the way 1.3.2 or older
 628                         // did it), otherwise encode params recursively.
 629                         jQuery.each( a, function buildParams( prefix, obj ) {
 630
 631                                 if ( jQuery.isArray(obj) ) {
 632                                         // Serialize array item.
 633                                         jQuery.each( obj, function( i, v ) {
 634                                                 if ( traditional ) {
 635                                                         // Treat each array item as a scalar.
 636                                                         add( prefix, v );
 637                                                 } else {
 638                                                         // If array item is non-scalar (array or object), encode its
 639                                                         // numeric index to resolve deserialization ambiguity issues.
 640                                                         // Note that rack (as of 1.0.0) can't currently deserialize
 641                                                         // nested arrays properly, and attempting to do so may cause
 642                                                         // a server error. Possible fixes are to modify rack's
 643                                                         // deserialization algorithm or to provide an option or flag
 644                                                         // to force array serialization to be shallow.
 645                                                         buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v );
 646                                                 }
 647                                         });
 648
 649                                 } else if ( !traditional && typeof obj === "object" ) {
 650                                         // Serialize object item.
 651                                         jQuery.each( obj, function( k, v ) {
 652                                                 buildParams( prefix + "[" + k + "]", v );
 653                                         });
 654
 655                                 } else {
 656                                         // Serialize scalar item.
 657                                         add( prefix, obj );
 658                                 }
 659                         });
 660                 }
 661
 662                 // Return the resulting serialization
 663                 return s.join("&").replace(r20, "+");
 664         }
 665
 666 });