src/ajax.js

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