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