src/ajax.js

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