src/ajax.js

   1 jQuery.fn.extend({
   2         // Keep a copy of the old load
   3         _load: jQuery.fn.load,
   4
   5         load: function( url, params, callback ) {
   6                 if ( typeof url !== "string" )
   7                         return this._load( url );
   8
   9                 var off = url.indexOf(" ");
  10                 if ( off >= 0 ) {
  11                         var selector = url.slice(off, url.length);
  12                         url = url.slice(0, off);
  13                 }
  14
  15                 // Default to a GET request
  16                 var type = "GET";
  17
  18                 // If the second parameter was provided
  19                 if ( params )
  20                         // If it's a function
  21                         if ( jQuery.isFunction( params ) ) {
  22                                 // We assume that it's the callback
  23                                 callback = params;
  24                                 params = null;
  25
  26                         // Otherwise, build a param string
  27                         } else if( typeof params === "object" ) {
  28                                 params = jQuery.param( params );
  29                                 type = "POST";
  30                         }
  31
  32                 var self = this;
  33
  34                 // Request the remote document
  35                 jQuery.ajax({
  36                         url: url,
  37                         type: type,
  38                         dataType: "html",
  39                         data: params,
  40                         complete: function(res, status){
  41                                 // If successful, inject the HTML into all the matched elements
  42                                 if ( status == "success" || status == "notmodified" )
  43                                         // See if a selector was specified
  44                                         self.html( selector ?
  45                                                 // Create a dummy div to hold the results
  46                                                 jQuery("<div/>")
  47                                                         // inject the contents of the document in, removing the scripts
  48                                                         // to avoid any 'Permission Denied' errors in IE
  49                                                         .append(res.responseText.replace(/<script(.|\s)*?\/script>/g, ""))
  50
  51                                                         // Locate the specified elements
  52                                                         .find(selector) :
  53
  54                                                 // If not, just inject the full result
  55                                                 res.responseText );
  56
  57                                 if( callback )
  58                                         self.each( callback, [res.responseText, status, res] );
  59                         }
  60                 });
  61                 return this;
  62         },
  63
  64         serialize: function() {
  65                 return jQuery.param(this.serializeArray());
  66         },
  67         serializeArray: function() {
  68                 return this.map(function(){
  69                         return this.elements ? jQuery.makeArray(this.elements) : this;
  70                 })
  71                 .filter(function(){
  72                         return this.name && !this.disabled &&
  73                                 (this.checked || /select|textarea/i.test(this.nodeName) ||
  74                                         /text|hidden|password/i.test(this.type));
  75                 })
  76                 .map(function(i, elem){
  77                         var val = jQuery(this).val();
  78                         return val == null ? null :
  79                                 jQuery.isArray(val) ?
  80                                         jQuery.map( val, function(val, i){
  81                                                 return {name: elem.name, value: val};
  82                                         }) :
  83                                         {name: elem.name, value: val};
  84                 }).get();
  85         }
  86 });
  87
  88 // Attach a bunch of functions for handling common AJAX events
  89 jQuery.each( "ajaxStart,ajaxStop,ajaxComplete,ajaxError,ajaxSuccess,ajaxSend".split(","), function(i,o){
  90         jQuery.fn[o] = function(f){
  91                 return this.bind(o, f);
  92         };
  93 });
  94
  95 var jsc = now();
  96
  97 jQuery.extend({
  98
  99         get: function( url, data, callback, type ) {
 100                 // shift arguments if data argument was ommited
 101                 if ( jQuery.isFunction( data ) ) {
 102                         callback = data;
 103                         data = null;
 104                 }
 105
 106                 return jQuery.ajax({
 107                         type: "GET",
 108                         url: url,
 109                         data: data,
 110                         success: callback,
 111                         dataType: type
 112                 });
 113         },
 114
 115         getScript: function( url, callback ) {
 116                 return jQuery.get(url, null, callback, "script");
 117         },
 118
 119         getJSON: function( url, data, callback ) {
 120                 return jQuery.get(url, data, callback, "json");
 121         },
 122
 123         post: function( url, data, callback, type ) {
 124                 if ( jQuery.isFunction( data ) ) {
 125                         callback = data;
 126                         data = {};
 127                 }
 128
 129                 return jQuery.ajax({
 130                         type: "POST",
 131                         url: url,
 132                         data: data,
 133                         success: callback,
 134                         dataType: type
 135                 });
 136         },
 137
 138         ajaxSetup: function( settings ) {
 139                 jQuery.extend( jQuery.ajaxSettings, settings );
 140         },
 141
 142         ajaxSettings: {
 143                 url: location.href,
 144                 global: true,
 145                 type: "GET",
 146                 contentType: "application/x-www-form-urlencoded",
 147                 processData: true,
 148                 async: true,
 149                 /*
 150                 timeout: 0,
 151                 data: null,
 152                 username: null,
 153                 password: null,
 154                 */
 155                 // Create the request object; Microsoft failed to properly
 156                 // implement the XMLHttpRequest in IE7, so we use the ActiveXObject when it is available
 157                 // This function can be overriden by calling jQuery.ajaxSetup
 158                 xhr:function(){
 159                         return window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
 160                 },
 161                 accepts: {
 162                         xml: "application/xml, text/xml",
 163                         html: "text/html",
 164                         script: "text/javascript, application/javascript",
 165                         json: "application/json, text/javascript",
 166                         text: "text/plain",
 167                         _default: "*/*"
 168                 }
 169         },
 170
 171         // Last-Modified header cache for next request
 172         lastModified: {},
 173
 174         ajax: function( s ) {
 175                 // Extend the settings, but re-extend 's' so that it can be
 176                 // checked again later (in the test suite, specifically)
 177                 s = jQuery.extend(true, s, jQuery.extend(true, {}, jQuery.ajaxSettings, s));
 178
 179                 var jsonp, jsre = /=\?(&|$)/g, status, data,
 180                         type = s.type.toUpperCase();
 181
 182                 // convert data if not already a string
 183                 if ( s.data && s.processData && typeof s.data !== "string" )
 184                         s.data = jQuery.param(s.data);
 185
 186                 // Handle JSONP Parameter Callbacks
 187                 if ( s.dataType == "jsonp" ) {
 188                         if ( type == "GET" ) {
 189                                 if ( !s.url.match(jsre) )
 190                                         s.url += (s.url.match(/\?/) ? "&" : "?") + (s.jsonp || "callback") + "=?";
 191                         } else if ( !s.data || !s.data.match(jsre) )
 192                                 s.data = (s.data ? s.data + "&" : "") + (s.jsonp || "callback") + "=?";
 193                         s.dataType = "json";
 194                 }
 195
 196                 // Build temporary JSONP function
 197                 if ( s.dataType == "json" && (s.data && s.data.match(jsre) || s.url.match(jsre)) ) {
 198                         jsonp = "jsonp" + jsc++;
 199
 200                         // Replace the =? sequence both in the query string and the data
 201                         if ( s.data )
 202                                 s.data = (s.data + "").replace(jsre, "=" + jsonp + "$1");
 203                         s.url = s.url.replace(jsre, "=" + jsonp + "$1");
 204
 205                         // We need to make sure
 206                         // that a JSONP style response is executed properly
 207                         s.dataType = "script";
 208
 209                         // Handle JSONP-style loading
 210                         window[ jsonp ] = function(tmp){
 211                                 data = tmp;
 212                                 success();
 213                                 complete();
 214                                 // Garbage collect
 215                                 window[ jsonp ] = undefined;
 216                                 try{ delete window[ jsonp ]; } catch(e){}
 217                                 if ( head )
 218                                         head.removeChild( script );
 219                         };
 220                 }
 221
 222                 if ( s.dataType == "script" && s.cache == null )
 223                         s.cache = false;
 224
 225                 if ( s.cache === false && type == "GET" ) {
 226                         var ts = now();
 227                         // try replacing _= if it is there
 228                         var ret = s.url.replace(/(\?|&)_=.*?(&|$)/, "$1_=" + ts + "$2");
 229                         // if nothing was replaced, add timestamp to the end
 230                         s.url = ret + ((ret == s.url) ? (s.url.match(/\?/) ? "&" : "?") + "_=" + ts : "");
 231                 }
 232
 233                 // If data is available, append data to url for get requests
 234                 if ( s.data && type == "GET" ) {
 235                         s.url += (s.url.match(/\?/) ? "&" : "?") + s.data;
 236
 237                         // IE likes to send both get and post data, prevent this
 238                         s.data = null;
 239                 }
 240
 241                 // Watch for a new set of requests
 242                 if ( s.global && ! jQuery.active++ )
 243                         jQuery.event.trigger( "ajaxStart" );
 244
 245                 // Matches an absolute URL, and saves the domain
 246                 var parts = /^(\w+:)?\/\/([^\/?#]+)/.exec( s.url );
 247
 248                 // If we're requesting a remote document
 249                 // and trying to load JSON or Script with a GET
 250                 if ( s.dataType == "script" && type == "GET" && parts
 251                         && ( parts[1] && parts[1] != location.protocol || parts[2] != location.host )){
 252
 253                         var head = document.getElementsByTagName("head")[0];
 254                         var script = document.createElement("script");
 255                         script.src = s.url;
 256                         if (s.scriptCharset)
 257                                 script.charset = s.scriptCharset;
 258
 259                         // Handle Script loading
 260                         if ( !jsonp ) {
 261                                 var done = false;
 262
 263                                 // Attach handlers for all browsers
 264                                 script.onload = script.onreadystatechange = function(){
 265                                         if ( !done && (!this.readyState ||
 266                                                         this.readyState == "loaded" || this.readyState == "complete") ) {
 267                                                 done = true;
 268                                                 success();
 269                                                 complete();
 270                                                 head.removeChild( script );
 271                                         }
 272                                 };
 273                         }
 274
 275                         head.appendChild(script);
 276
 277                         // We handle everything using the script element injection
 278                         return undefined;
 279                 }
 280
 281                 var requestDone = false;
 282
 283                 // Create the request object
 284                 var xhr = s.xhr();
 285
 286                 // Open the socket
 287                 // Passing null username, generates a login popup on Opera (#2865)
 288                 if( s.username )
 289                         xhr.open(type, s.url, s.async, s.username, s.password);
 290                 else
 291                         xhr.open(type, s.url, s.async);
 292
 293                 // Need an extra try/catch for cross domain requests in Firefox 3
 294                 try {
 295                         // Set the correct header, if data is being sent
 296                         if ( s.data )
 297                                 xhr.setRequestHeader("Content-Type", s.contentType);
 298
 299                         // Set the If-Modified-Since header, if ifModified mode.
 300                         if ( s.ifModified )
 301                                 xhr.setRequestHeader("If-Modified-Since",
 302                                         jQuery.lastModified[s.url] || "Thu, 01 Jan 1970 00:00:00 GMT" );
 303
 304                         // Set header so the called script knows that it's an XMLHttpRequest
 305                         xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
 306
 307                         // Set the Accepts header for the server, depending on the dataType
 308                         xhr.setRequestHeader("Accept", s.dataType && s.accepts[ s.dataType ] ?
 309                                 s.accepts[ s.dataType ] + ", */*" :
 310                                 s.accepts._default );
 311                 } catch(e){}
 312
 313                 // Allow custom headers/mimetypes and early abort
 314                 if ( s.beforeSend && s.beforeSend(xhr, s) === false ) {
 315                         // Handle the global AJAX counter
 316                         if ( s.global && ! --jQuery.active )
 317                                 jQuery.event.trigger( "ajaxStop" );
 318                         // close opended socket
 319                         xhr.abort();
 320                         return false;
 321                 }
 322
 323                 if ( s.global )
 324                         jQuery.event.trigger("ajaxSend", [xhr, s]);
 325
 326                 // Wait for a response to come back
 327                 var onreadystatechange = function(isTimeout){
 328                         // The request was aborted, clear the interval and decrement jQuery.active
 329                         if (xhr.readyState == 0) {
 330                                 if (ival) {
 331                                         // clear poll interval
 332                                         clearInterval(ival);
 333                                         ival = null;
 334                                         // Handle the global AJAX counter
 335                                         if ( s.global && ! --jQuery.active )
 336                                                 jQuery.event.trigger( "ajaxStop" );
 337                                 }
 338                         // The transfer is complete and the data is available, or the request timed out
 339                         } else if ( !requestDone && xhr && (xhr.readyState == 4 || isTimeout == "timeout") ) {
 340                                 requestDone = true;
 341
 342                                 // clear poll interval
 343                                 if (ival) {
 344                                         clearInterval(ival);
 345                                         ival = null;
 346                                 }
 347
 348                                 status = isTimeout == "timeout" ? "timeout" :
 349                                         !jQuery.httpSuccess( xhr ) ? "error" :
 350                                         s.ifModified && jQuery.httpNotModified( xhr, s.url ) ? "notmodified" :
 351                                         "success";
 352
 353                                 if ( status == "success" ) {
 354                                         // Watch for, and catch, XML document parse errors
 355                                         try {
 356                                                 // process the data (runs the xml through httpData regardless of callback)
 357                                                 data = jQuery.httpData( xhr, s.dataType, s );
 358                                         } catch(e) {
 359                                                 status = "parsererror";
 360                                         }
 361                                 }
 362
 363                                 // Make sure that the request was successful or notmodified
 364                                 if ( status == "success" ) {
 365                                         // Cache Last-Modified header, if ifModified mode.
 366                                         var modRes;
 367                                         try {
 368                                                 modRes = xhr.getResponseHeader("Last-Modified");
 369                                         } catch(e) {} // swallow exception thrown by FF if header is not available
 370
 371                                         if ( s.ifModified && modRes )
 372                                                 jQuery.lastModified[s.url] = modRes;
 373
 374                                         // JSONP handles its own success callback
 375                                         if ( !jsonp )
 376                                                 success();
 377                                 } else
 378                                         jQuery.handleError(s, xhr, status);
 379
 380                                 // Fire the complete handlers
 381                                 complete();
 382
 383                                 // Stop memory leaks
 384                                 if ( s.async )
 385                                         xhr = null;
 386                         }
 387                 };
 388
 389                 if ( s.async ) {
 390                         // don't attach the handler to the request, just poll it instead
 391                         var ival = setInterval(onreadystatechange, 13);
 392
 393                         // Timeout checker
 394                         if ( s.timeout > 0 )
 395                                 setTimeout(function(){
 396                                         // Check to see if the request is still happening
 397                                         if ( xhr ) {
 398                                                 if( !requestDone )
 399                                                         onreadystatechange( "timeout" );
 400
 401                                                 // Cancel the request
 402                                                 if ( xhr )
 403                                                         xhr.abort();
 404                                         }
 405                                 }, s.timeout);
 406                 }
 407
 408                 // Send the data
 409                 try {
 410                         xhr.send(s.data);
 411                 } catch(e) {
 412                         jQuery.handleError(s, xhr, null, e);
 413                 }
 414
 415                 // firefox 1.5 doesn't fire statechange for sync requests
 416                 if ( !s.async )
 417                         onreadystatechange();
 418
 419                 function success(){
 420                         // If a local callback was specified, fire it and pass it the data
 421                         if ( s.success )
 422                                 s.success( data, status );
 423
 424                         // Fire the global callback
 425                         if ( s.global )
 426                                 jQuery.event.trigger( "ajaxSuccess", [xhr, s] );
 427                 }
 428
 429                 function complete(){
 430                         // Process result
 431                         if ( s.complete )
 432                                 s.complete(xhr, status);
 433
 434                         // The request was completed
 435                         if ( s.global )
 436                                 jQuery.event.trigger( "ajaxComplete", [xhr, s] );
 437
 438                         // Handle the global AJAX counter
 439                         if ( s.global && ! --jQuery.active )
 440                                 jQuery.event.trigger( "ajaxStop" );
 441                 }
 442
 443                 // return XMLHttpRequest to allow aborting the request etc.
 444                 return xhr;
 445         },
 446
 447         handleError: function( s, xhr, status, e ) {
 448                 // If a local callback was specified, fire it
 449                 if ( s.error ) s.error( xhr, status, e );
 450
 451                 // Fire the global callback
 452                 if ( s.global )
 453                         jQuery.event.trigger( "ajaxError", [xhr, s, e] );
 454         },
 455
 456         // Counter for holding the number of active queries
 457         active: 0,
 458
 459         // Determines if an XMLHttpRequest was successful or not
 460         httpSuccess: function( xhr ) {
 461                 try {
 462                         // IE error sometimes returns 1223 when it should be 204 so treat it as success, see #1450
 463                         return !xhr.status && location.protocol == "file:" ||
 464                                 ( xhr.status >= 200 && xhr.status < 300 ) || xhr.status == 304 || xhr.status == 1223;
 465                 } catch(e){}
 466                 return false;
 467         },
 468
 469         // Determines if an XMLHttpRequest returns NotModified
 470         httpNotModified: function( xhr, url ) {
 471                 try {
 472                         var xhrRes = xhr.getResponseHeader("Last-Modified");
 473
 474                         // Firefox always returns 200. check Last-Modified date
 475                         return xhr.status == 304 || xhrRes == jQuery.lastModified[url];
 476                 } catch(e){}
 477                 return false;
 478         },
 479
 480         httpData: function( xhr, type, s ) {
 481                 var ct = xhr.getResponseHeader("content-type"),
 482                         xml = type == "xml" || !type && ct && ct.indexOf("xml") >= 0,
 483                         data = xml ? xhr.responseXML : xhr.responseText;
 484
 485                 if ( xml && data.documentElement.tagName == "parsererror" )
 486                         throw "parsererror";
 487
 488                 // Allow a pre-filtering function to sanitize the response
 489                 // s != null is checked to keep backwards compatibility
 490                 if( s && s.dataFilter )
 491                         data = s.dataFilter( data, type );
 492
 493                 // The filter can actually parse the response
 494                 if( typeof data === "string" ){
 495
 496                         // If the type is "script", eval it in global context
 497                         if ( type == "script" )
 498                                 jQuery.globalEval( data );
 499
 500                         // Get the JavaScript object, if JSON is used.
 501                         if ( type == "json" )
 502                                 data = window["eval"]("(" + data + ")");
 503                 }
 504
 505                 return data;
 506         },
 507
 508         // Serialize an array of form elements or a set of
 509         // key/values into a query string
 510         param: function( a ) {
 511                 var s = [ ];
 512
 513                 function add( key, value ){
 514                         s[ s.length ] = encodeURIComponent(key) + '=' + encodeURIComponent(value);
 515                 };
 516
 517                 // If an array was passed in, assume that it is an array
 518                 // of form elements
 519                 if ( jQuery.isArray(a) || a.jquery )
 520                         // Serialize the form elements
 521                         jQuery.each( a, function(){
 522                                 add( this.name, this.value );
 523                         });
 524
 525                 // Otherwise, assume that it's an object of key/value pairs
 526                 else
 527                         // Serialize the key/values
 528                         for ( var j in a )
 529                                 // If the value is an array then the key names need to be repeated
 530                                 if ( jQuery.isArray(a[j]) )
 531                                         jQuery.each( a[j], function(){
 532                                                 add( j, this );
 533                                         });
 534                                 else
 535                                         add( j, jQuery.isFunction(a[j]) ? a[j]() : a[j] );
 536
 537                 // Return the resulting serialization
 538                 return s.join("&").replace(/%20/g, "+");
 539         }
 540
 541 });