include/javascript/yui/build/connection/connection.js

   1 /*
   2 Copyright (c) 2011, Yahoo! Inc. All rights reserved.
   3 Code licensed under the BSD License:
   4 http://developer.yahoo.com/yui/license.html
   5 version: 2.9.0
   6 */
   7 /**
   8  * The Connection Manager provides a simplified interface to the XMLHttpRequest
   9  * object.  It handles cross-browser instantiantion of XMLHttpRequest, negotiates the
  10  * interactive states and server response, returning the results to a pre-defined
  11  * callback you create.
  12  *
  13  * @namespace YAHOO.util
  14  * @module connection
  15  * @requires yahoo
  16  * @requires event
  17  */
  18
  19 /**
  20  * The Connection Manager singleton provides methods for creating and managing
  21  * asynchronous transactions.
  22  *
  23  * @class YAHOO.util.Connect
  24  */
  25
  26 YAHOO.util.Connect =
  27 {
  28   /**
  29    * @description Array of MSFT ActiveX ids for XMLHttpRequest.
  30    * @property _msxml_progid
  31    * @private
  32    * @static
  33    * @type array
  34    */
  35     _msxml_progid:[
  36         'Microsoft.XMLHTTP',
  37         'MSXML2.XMLHTTP.3.0',
  38         'MSXML2.XMLHTTP'
  39         ],
  40
  41   /**
  42    * @description Object literal of HTTP header(s)
  43    * @property _http_header
  44    * @private
  45    * @static
  46    * @type object
  47    */
  48     _http_headers:{},
  49
  50   /**
  51    * @description Determines if HTTP headers are set.
  52    * @property _has_http_headers
  53    * @private
  54    * @static
  55    * @type boolean
  56    */
  57     _has_http_headers:false,
  58
  59  /**
  60   * @description Determines if a default header of
  61   * Content-Type of 'application/x-www-form-urlencoded'
  62   * will be added to any client HTTP headers sent for POST
  63   * transactions.
  64   * @property _use_default_post_header
  65   * @private
  66   * @static
  67   * @type boolean
  68   */
  69     _use_default_post_header:true,
  70
  71  /**
  72   * @description The default header used for POST transactions.
  73   * @property _default_post_header
  74   * @private
  75   * @static
  76   * @type boolean
  77   */
  78     _default_post_header:'application/x-www-form-urlencoded; charset=UTF-8',
  79
  80  /**
  81   * @description The default header used for transactions involving the
  82   * use of HTML forms.
  83   * @property _default_form_header
  84   * @private
  85   * @static
  86   * @type boolean
  87   */
  88     _default_form_header:'application/x-www-form-urlencoded',
  89
  90  /**
  91   * @description Determines if a default header of
  92   * 'X-Requested-With: XMLHttpRequest'
  93   * will be added to each transaction.
  94   * @property _use_default_xhr_header
  95   * @private
  96   * @static
  97   * @type boolean
  98   */
  99     _use_default_xhr_header:true,
 100
 101  /**
 102   * @description The default header value for the label
 103   * "X-Requested-With".  This is sent with each
 104   * transaction, by default, to identify the
 105   * request as being made by YUI Connection Manager.
 106   * @property _default_xhr_header
 107   * @private
 108   * @static
 109   * @type boolean
 110   */
 111     _default_xhr_header:'XMLHttpRequest',
 112
 113  /**
 114   * @description Determines if custom, default headers
 115   * are set for each transaction.
 116   * @property _has_default_header
 117   * @private
 118   * @static
 119   * @type boolean
 120   */
 121     _has_default_headers:true,
 122
 123  /**
 124    * @description Property modified by setForm() to determine if the data
 125    * should be submitted as an HTML form.
 126    * @property _isFormSubmit
 127    * @private
 128    * @static
 129    * @type boolean
 130    */
 131         _isFormSubmit:false,
 132
 133  /**
 134   * @description Determines if custom, default headers
 135   * are set for each transaction.
 136   * @property _has_default_header
 137   * @private
 138   * @static
 139   * @type boolean
 140   */
 141     _default_headers:{},
 142
 143  /**
 144   * @description Collection of polling references to the polling mechanism in handleReadyState.
 145   * @property _poll
 146   * @private
 147   * @static
 148   * @type object
 149   */
 150     _poll:{},
 151
 152  /**
 153   * @description Queue of timeout values for each transaction callback with a defined timeout value.
 154   * @property _timeOut
 155   * @private
 156   * @static
 157   * @type object
 158   */
 159     _timeOut:{},
 160
 161   /**
 162    * @description The polling frequency, in milliseconds, for HandleReadyState.
 163    * when attempting to determine a transaction's XHR readyState.
 164    * The default is 50 milliseconds.
 165    * @property _polling_interval
 166    * @private
 167    * @static
 168    * @type int
 169    */
 170      _polling_interval:50,
 171
 172   /**
 173    * @description A transaction counter that increments the transaction id for each transaction.
 174    * @property _transaction_id
 175    * @private
 176    * @static
 177    * @type int
 178    */
 179      _transaction_id:0,
 180
 181   /**
 182    * @description Custom event that fires at the start of a transaction
 183    * @property startEvent
 184    * @private
 185    * @static
 186    * @type CustomEvent
 187    */
 188     startEvent: new YAHOO.util.CustomEvent('start'),
 189
 190   /**
 191    * @description Custom event that fires when a transaction response has completed.
 192    * @property completeEvent
 193    * @private
 194    * @static
 195    * @type CustomEvent
 196    */
 197     completeEvent: new YAHOO.util.CustomEvent('complete'),
 198
 199   /**
 200    * @description Custom event that fires when handleTransactionResponse() determines a
 201    * response in the HTTP 2xx range.
 202    * @property successEvent
 203    * @private
 204    * @static
 205    * @type CustomEvent
 206    */
 207     successEvent: new YAHOO.util.CustomEvent('success'),
 208
 209   /**
 210    * @description Custom event that fires when handleTransactionResponse() determines a
 211    * response in the HTTP 4xx/5xx range.
 212    * @property failureEvent
 213    * @private
 214    * @static
 215    * @type CustomEvent
 216    */
 217     failureEvent: new YAHOO.util.CustomEvent('failure'),
 218
 219   /**
 220    * @description Custom event that fires when a transaction is successfully aborted.
 221    * @property abortEvent
 222    * @private
 223    * @static
 224    * @type CustomEvent
 225    */
 226     abortEvent: new YAHOO.util.CustomEvent('abort'),
 227
 228   /**
 229    * @description A reference table that maps callback custom events members to its specific
 230    * event name.
 231    * @property _customEvents
 232    * @private
 233    * @static
 234    * @type object
 235    */
 236     _customEvents:
 237     {
 238         onStart:['startEvent', 'start'],
 239         onComplete:['completeEvent', 'complete'],
 240         onSuccess:['successEvent', 'success'],
 241         onFailure:['failureEvent', 'failure'],
 242         onUpload:['uploadEvent', 'upload'],
 243         onAbort:['abortEvent', 'abort']
 244     },
 245
 246   /**
 247    * @description Member to add an ActiveX id to the existing xml_progid array.
 248    * In the event(unlikely) a new ActiveX id is introduced, it can be added
 249    * without internal code modifications.
 250    * @method setProgId
 251    * @public
 252    * @static
 253    * @param {string} id The ActiveX id to be added to initialize the XHR object.
 254    * @return void
 255    */
 256     setProgId:function(id)
 257     {
 258         this._msxml_progid.unshift(id);
 259     },
 260
 261   /**
 262    * @description Member to override the default POST header.
 263    * @method setDefaultPostHeader
 264    * @public
 265    * @static
 266    * @param {boolean} b Set and use default header - true or false .
 267    * @return void
 268    */
 269     setDefaultPostHeader:function(b)
 270     {
 271         if(typeof b == 'string'){
 272             this._default_post_header = b;
 273                         this._use_default_post_header = true;
 274
 275         }
 276         else if(typeof b == 'boolean'){
 277             this._use_default_post_header = b;
 278         }
 279     },
 280
 281   /**
 282    * @description Member to override the default transaction header..
 283    * @method setDefaultXhrHeader
 284    * @public
 285    * @static
 286    * @param {boolean} b Set and use default header - true or false .
 287    * @return void
 288    */
 289     setDefaultXhrHeader:function(b)
 290     {
 291         if(typeof b == 'string'){
 292             this._default_xhr_header = b;
 293         }
 294         else{
 295             this._use_default_xhr_header = b;
 296         }
 297     },
 298
 299   /**
 300    * @description Member to modify the default polling interval.
 301    * @method setPollingInterval
 302    * @public
 303    * @static
 304    * @param {int} i The polling interval in milliseconds.
 305    * @return void
 306    */
 307     setPollingInterval:function(i)
 308     {
 309         if(typeof i == 'number' && isFinite(i)){
 310             this._polling_interval = i;
 311         }
 312     },
 313
 314   /**
 315    * @description Instantiates a XMLHttpRequest object and returns an object with two properties:
 316    * the XMLHttpRequest instance and the transaction id.
 317    * @method createXhrObject
 318    * @private
 319    * @static
 320    * @param {int} transactionId Property containing the transaction id for this transaction.
 321    * @return object
 322    */
 323     createXhrObject:function(transactionId)
 324     {
 325         var obj,http,i;
 326         try
 327         {
 328             // Instantiates XMLHttpRequest in non-IE browsers and assigns to http.
 329             http = new XMLHttpRequest();
 330             //  Object literal with http and tId properties
 331             obj = { conn:http, tId:transactionId, xhr: true };
 332         }
 333         catch(e)
 334         {
 335             for(i=0; i<this._msxml_progid.length; ++i){
 336                 try
 337                 {
 338                     // Instantiates XMLHttpRequest for IE and assign to http
 339                     http = new ActiveXObject(this._msxml_progid[i]);
 340                     //  Object literal with conn and tId properties
 341                     obj = { conn:http, tId:transactionId, xhr: true };
 342                     break;
 343                 }
 344                 catch(e1){}
 345             }
 346         }
 347         finally
 348         {
 349             return obj;
 350         }
 351     },
 352
 353   /**
 354    * @description This method is called by asyncRequest to create a
 355    * valid connection object for the transaction.  It also passes a
 356    * transaction id and increments the transaction id counter.
 357    * @method getConnectionObject
 358    * @private
 359    * @static
 360    * @return {object}
 361    */
 362     getConnectionObject:function(t)
 363     {
 364         var o, tId = this._transaction_id;
 365
 366         try
 367         {
 368             if(!t){
 369                 o = this.createXhrObject(tId);
 370             }
 371             else{
 372                 o = {tId:tId};
 373                 if(t==='xdr'){
 374                     o.conn = this._transport;
 375                     o.xdr = true;
 376                 }
 377                 else if(t==='upload'){
 378                     o.upload = true;
 379                 }
 380             }
 381
 382             if(o){
 383                 this._transaction_id++;
 384             }
 385         }
 386         catch(e){}
 387         return o;
 388     },
 389
 390   /**
 391    * @description Method for initiating an asynchronous request via the XHR object.
 392    * @method asyncRequest
 393    * @public
 394    * @static
 395    * @param {string} method HTTP transaction method
 396    * @param {string} uri Fully qualified path of resource
 397    * @param {callback} callback User-defined callback function or object
 398    * @param {string} postData POST body
 399    * @return {object} Returns the connection object
 400    */
 401     asyncRequest:function(method, uri, callback, postData)
 402     {
 403         var args = callback&&callback.argument?callback.argument:null,
 404             YCM = this,
 405             o, t;
 406
 407         if(this._isFileUpload){
 408             t = 'upload';
 409         }
 410         else if(callback && callback.xdr){
 411             t = 'xdr';
 412         }
 413
 414         o = this.getConnectionObject(t);
 415         if(!o){
 416             return null;
 417         }
 418         else{
 419
 420             // Intialize any transaction-specific custom events, if provided.
 421             if(callback && callback.customevents){
 422                 this.initCustomEvents(o, callback);
 423             }
 424
 425             if(this._isFormSubmit){
 426                 if(this._isFileUpload){
 427                     window.setTimeout(function(){YCM.uploadFile(o, callback, uri, postData);}, 10);
 428                     return o;
 429                 }
 430
 431                 // If the specified HTTP method is GET, setForm() will return an
 432                 // encoded string that is concatenated to the uri to
 433                 // create a querystring.
 434                 if(method.toUpperCase() == 'GET'){
 435                     if(this._sFormData.length !== 0){
 436                         // If the URI already contains a querystring, append an ampersand
 437                         // and then concatenate _sFormData to the URI.
 438                         uri += ((uri.indexOf('?') == -1)?'?':'&') + this._sFormData;
 439                     }
 440                 }
 441                 else if(method.toUpperCase() == 'POST'){
 442                     // If POST data exist in addition to the HTML form data,
 443                     // it will be concatenated to the form data.
 444                     postData = postData?this._sFormData + "&" + postData:this._sFormData;
 445                 }
 446             }
 447
 448             if(method.toUpperCase() == 'GET' && (callback && callback.cache === false)){
 449                 // If callback.cache is defined and set to false, a
 450                 // timestamp value will be added to the querystring.
 451                 uri += ((uri.indexOf('?') == -1)?'?':'&') + "rnd=" + new Date().valueOf().toString();
 452             }
 453
 454             // Each transaction will automatically include a custom header of
 455             // "X-Requested-With: XMLHttpRequest" to identify the request as
 456             // having originated from Connection Manager.
 457             if(this._use_default_xhr_header){
 458                 if(!this._default_headers['X-Requested-With']){
 459                     this.initHeader('X-Requested-With', this._default_xhr_header, true);
 460                 }
 461             }
 462
 463             //If the transaction method is POST and the POST header value is set to true
 464             //or a custom value, initalize the Content-Type header to this value.
 465             if((method.toUpperCase() === 'POST' && this._use_default_post_header) && this._isFormSubmit === false){
 466                 this.initHeader('Content-Type', this._default_post_header);
 467             }
 468
 469             if(o.xdr){
 470                 this.xdr(o, method, uri, callback, postData);
 471                 return o;
 472             }
 473
 474             o.conn.open(method, uri, true);
 475             //Initialize all default and custom HTTP headers,
 476             if(this._has_default_headers || this._has_http_headers){
 477                 this.setHeader(o);
 478             }
 479
 480             this.handleReadyState(o, callback);
 481             o.conn.send(postData || '');
 482
 483             // Reset the HTML form data and state properties as
 484             // soon as the data are submitted.
 485             if(this._isFormSubmit === true){
 486                 this.resetFormState();
 487             }
 488
 489             // Fire global custom event -- startEvent
 490             this.startEvent.fire(o, args);
 491
 492             if(o.startEvent){
 493                 // Fire transaction custom event -- startEvent
 494                 o.startEvent.fire(o, args);
 495             }
 496
 497             return o;
 498         }
 499     },
 500
 501   /**
 502    * @description This method creates and subscribes custom events,
 503    * specific to each transaction
 504    * @method initCustomEvents
 505    * @private
 506    * @static
 507    * @param {object} o The connection object
 508    * @param {callback} callback The user-defined callback object
 509    * @return {void}
 510    */
 511     initCustomEvents:function(o, callback)
 512     {
 513         var prop;
 514         // Enumerate through callback.customevents members and bind/subscribe
 515         // events that match in the _customEvents table.
 516         for(prop in callback.customevents){
 517             if(this._customEvents[prop][0]){
 518                 // Create the custom event
 519                 o[this._customEvents[prop][0]] = new YAHOO.util.CustomEvent(this._customEvents[prop][1], (callback.scope)?callback.scope:null);
 520
 521                 // Subscribe the custom event
 522                 o[this._customEvents[prop][0]].subscribe(callback.customevents[prop]);
 523             }
 524         }
 525     },
 526
 527   /**
 528    * @description This method serves as a timer that polls the XHR object's readyState
 529    * property during a transaction, instead of binding a callback to the
 530    * onreadystatechange event.  Upon readyState 4, handleTransactionResponse
 531    * will process the response, and the timer will be cleared.
 532    * @method handleReadyState
 533    * @private
 534    * @static
 535    * @param {object} o The connection object
 536    * @param {callback} callback The user-defined callback object
 537    * @return {void}
 538    */
 539
 540     handleReadyState:function(o, callback)
 541
 542     {
 543         var oConn = this,
 544             args = (callback && callback.argument)?callback.argument:null;
 545
 546         if(callback && callback.timeout){
 547             this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
 548         }
 549
 550         this._poll[o.tId] = window.setInterval(
 551             function(){
 552                 if(o.conn && o.conn.readyState === 4){
 553
 554                     // Clear the polling interval for the transaction
 555                     // and remove the reference from _poll.
 556                     window.clearInterval(oConn._poll[o.tId]);
 557                     delete oConn._poll[o.tId];
 558
 559                     if(callback && callback.timeout){
 560                         window.clearTimeout(oConn._timeOut[o.tId]);
 561                         delete oConn._timeOut[o.tId];
 562                     }
 563
 564                     // Fire global custom event -- completeEvent
 565                     oConn.completeEvent.fire(o, args);
 566
 567                     if(o.completeEvent){
 568                         // Fire transaction custom event -- completeEvent
 569                         o.completeEvent.fire(o, args);
 570                     }
 571
 572                     oConn.handleTransactionResponse(o, callback);
 573                 }
 574             }
 575         ,this._polling_interval);
 576     },
 577
 578   /**
 579    * @description This method attempts to interpret the server response and
 580    * determine whether the transaction was successful, or if an error or
 581    * exception was encountered.
 582    * @method handleTransactionResponse
 583    * @private
 584    * @static
 585    * @param {object} o The connection object
 586    * @param {object} callback The user-defined callback object
 587    * @param {boolean} isAbort Determines if the transaction was terminated via abort().
 588    * @return {void}
 589    */
 590     handleTransactionResponse:function(o, callback, isAbort)
 591     {
 592         var httpStatus, responseObject,
 593             args = (callback && callback.argument)?callback.argument:null,
 594             xdrS = (o.r && o.r.statusText === 'xdr:success')?true:false,
 595             xdrF = (o.r && o.r.statusText === 'xdr:failure')?true:false,
 596             xdrA = isAbort;
 597
 598         try
 599         {
 600             if((o.conn.status !== undefined && o.conn.status !== 0) || xdrS){
 601                 // XDR requests will not have HTTP status defined. The
 602                 // statusText property will define the response status
 603                 // set by the Flash transport.
 604                 httpStatus = o.conn.status;
 605             }
 606             else if(xdrF && !xdrA){
 607                 // Set XDR transaction failure to a status of 0, which
 608                 // resolves as an HTTP failure, instead of an exception.
 609                 httpStatus = 0;
 610             }
 611             else{
 612                 httpStatus = 13030;
 613             }
 614         }
 615         catch(e){
 616
 617              // 13030 is a custom code to indicate the condition -- in Mozilla/FF --
 618              // when the XHR object's status and statusText properties are
 619              // unavailable, and a query attempt throws an exception.
 620             httpStatus = 13030;
 621         }
 622
 623         if((httpStatus >= 200 && httpStatus < 300) || httpStatus === 1223 || xdrS){
 624             responseObject = o.xdr ? o.r : this.createResponseObject(o, args);
 625             if(callback && callback.success){
 626                 if(!callback.scope){
 627                     callback.success(responseObject);
 628                 }
 629                 else{
 630                     // If a scope property is defined, the callback will be fired from
 631                     // the context of the object.
 632                     callback.success.apply(callback.scope, [responseObject]);
 633                 }
 634             }
 635
 636             // Fire global custom event -- successEvent
 637             this.successEvent.fire(responseObject);
 638
 639             if(o.successEvent){
 640                 // Fire transaction custom event -- successEvent
 641                 o.successEvent.fire(responseObject);
 642             }
 643         }
 644         else{
 645             switch(httpStatus){
 646                 // The following cases are wininet.dll error codes that may be encountered.
 647                 case 12002: // Server timeout
 648                 case 12029: // 12029 to 12031 correspond to dropped connections.
 649                 case 12030:
 650                 case 12031:
 651                 case 12152: // Connection closed by server.
 652                 case 13030: // See above comments for variable status.
 653                     // XDR transactions will not resolve to this case, since the
 654                     // response object is already built in the xdr response.
 655                     responseObject = this.createExceptionObject(o.tId, args, (isAbort?isAbort:false));
 656                     if(callback && callback.failure){
 657                         if(!callback.scope){
 658                             callback.failure(responseObject);
 659                         }
 660                         else{
 661                             callback.failure.apply(callback.scope, [responseObject]);
 662                         }
 663                     }
 664
 665                     break;
 666                 default:
 667                     responseObject = (o.xdr) ? o.response : this.createResponseObject(o, args);
 668                     if(callback && callback.failure){
 669                         if(!callback.scope){
 670                             callback.failure(responseObject);
 671                         }
 672                         else{
 673                             callback.failure.apply(callback.scope, [responseObject]);
 674                         }
 675                     }
 676             }
 677
 678             // Fire global custom event -- failureEvent
 679             this.failureEvent.fire(responseObject);
 680
 681             if(o.failureEvent){
 682                 // Fire transaction custom event -- failureEvent
 683                 o.failureEvent.fire(responseObject);
 684             }
 685
 686         }
 687
 688         this.releaseObject(o);
 689         responseObject = null;
 690     },
 691
 692   /**
 693    * @description This method evaluates the server response, creates and returns the results via
 694    * its properties.  Success and failure cases will differ in the response
 695    * object's property values.
 696    * @method createResponseObject
 697    * @private
 698    * @static
 699    * @param {object} o The connection object
 700    * @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
 701    * @return {object}
 702    */
 703     createResponseObject:function(o, callbackArg)
 704     {
 705         var obj = {}, headerObj = {},
 706             i, headerStr, header, delimitPos;
 707
 708         try
 709         {
 710             headerStr = o.conn.getAllResponseHeaders();
 711             header = headerStr.split('\n');
 712             for(i=0; i<header.length; i++){
 713                 delimitPos = header[i].indexOf(':');
 714                 if(delimitPos != -1){
 715                     headerObj[header[i].substring(0,delimitPos)] = YAHOO.lang.trim(header[i].substring(delimitPos+2));
 716                 }
 717             }
 718         }
 719         catch(e){}
 720
 721         obj.tId = o.tId;
 722         // Normalize IE's response to HTTP 204 when Win error 1223.
 723         obj.status = (o.conn.status == 1223)?204:o.conn.status;
 724         // Normalize IE's statusText to "No Content" instead of "Unknown".
 725         obj.statusText = (o.conn.status == 1223)?"No Content":o.conn.statusText;
 726         obj.getResponseHeader = headerObj;
 727         obj.getAllResponseHeaders = headerStr;
 728         obj.responseText = o.conn.responseText;
 729         obj.responseXML = o.conn.responseXML;
 730
 731         if(callbackArg){
 732             obj.argument = callbackArg;
 733         }
 734
 735         return obj;
 736     },
 737
 738   /**
 739    * @description If a transaction cannot be completed due to dropped or closed connections,
 740    * there may be not be enough information to build a full response object.
 741    * The failure callback will be fired and this specific condition can be identified
 742    * by a status property value of 0.
 743    *
 744    * If an abort was successful, the status property will report a value of -1.
 745    *
 746    * @method createExceptionObject
 747    * @private
 748    * @static
 749    * @param {int} tId The Transaction Id
 750    * @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
 751    * @param {boolean} isAbort Determines if the exception case is caused by a transaction abort
 752    * @return {object}
 753    */
 754     createExceptionObject:function(tId, callbackArg, isAbort)
 755     {
 756         var COMM_CODE = 0,
 757             COMM_ERROR = 'communication failure',
 758             ABORT_CODE = -1,
 759             ABORT_ERROR = 'transaction aborted',
 760             obj = {};
 761
 762         obj.tId = tId;
 763         if(isAbort){
 764             obj.status = ABORT_CODE;
 765             obj.statusText = ABORT_ERROR;
 766         }
 767         else{
 768             obj.status = COMM_CODE;
 769             obj.statusText = COMM_ERROR;
 770         }
 771
 772         if(callbackArg){
 773             obj.argument = callbackArg;
 774         }
 775
 776         return obj;
 777     },
 778
 779   /**
 780    * @description Method that initializes the custom HTTP headers for the each transaction.
 781    * @method initHeader
 782    * @public
 783    * @static
 784    * @param {string} label The HTTP header label
 785    * @param {string} value The HTTP header value
 786    * @param {string} isDefault Determines if the specific header is a default header
 787    * automatically sent with each transaction.
 788    * @return {void}
 789    */
 790     initHeader:function(label, value, isDefault)
 791     {
 792         var headerObj = (isDefault)?this._default_headers:this._http_headers;
 793
 794         headerObj[label] = value;
 795         if(isDefault){
 796             this._has_default_headers = true;
 797         }
 798         else{
 799             this._has_http_headers = true;
 800         }
 801     },
 802
 803
 804   /**
 805    * @description Accessor that sets the HTTP headers for each transaction.
 806    * @method setHeader
 807    * @private
 808    * @static
 809    * @param {object} o The connection object for the transaction.
 810    * @return {void}
 811    */
 812     setHeader:function(o)
 813     {
 814         var prop;
 815         if(this._has_default_headers){
 816             for(prop in this._default_headers){
 817                 if(YAHOO.lang.hasOwnProperty(this._default_headers, prop)){
 818                     o.conn.setRequestHeader(prop, this._default_headers[prop]);
 819                 }
 820             }
 821         }
 822
 823         if(this._has_http_headers){
 824             for(prop in this._http_headers){
 825                 if(YAHOO.lang.hasOwnProperty(this._http_headers, prop)){
 826                     o.conn.setRequestHeader(prop, this._http_headers[prop]);
 827                 }
 828             }
 829
 830             this._http_headers = {};
 831             this._has_http_headers = false;
 832         }
 833     },
 834
 835   /**
 836    * @description Resets the default HTTP headers object
 837    * @method resetDefaultHeaders
 838    * @public
 839    * @static
 840    * @return {void}
 841    */
 842     resetDefaultHeaders:function(){
 843         this._default_headers = {};
 844         this._has_default_headers = false;
 845     },
 846
 847   /**
 848    * @description Method to terminate a transaction, if it has not reached readyState 4.
 849    * @method abort
 850    * @public
 851    * @static
 852    * @param {object} o The connection object returned by asyncRequest.
 853    * @param {object} callback  User-defined callback object.
 854    * @param {string} isTimeout boolean to indicate if abort resulted from a callback timeout.
 855    * @return {boolean}
 856    */
 857     abort:function(o, callback, isTimeout)
 858     {
 859         var abortStatus,
 860             args = (callback && callback.argument)?callback.argument:null;
 861             o = o || {};
 862
 863         if(o.conn){
 864             if(o.xhr){
 865                 if(this.isCallInProgress(o)){
 866                     // Issue abort request
 867                     o.conn.abort();
 868
 869                     window.clearInterval(this._poll[o.tId]);
 870                     delete this._poll[o.tId];
 871
 872                     if(isTimeout){
 873                         window.clearTimeout(this._timeOut[o.tId]);
 874                         delete this._timeOut[o.tId];
 875                     }
 876
 877                     abortStatus = true;
 878                 }
 879             }
 880             else if(o.xdr){
 881                 o.conn.abort(o.tId);
 882                 abortStatus = true;
 883             }
 884         }
 885         else if(o.upload){
 886             var frameId = 'yuiIO' + o.tId;
 887             var io = document.getElementById(frameId);
 888
 889             if(io){
 890                 // Remove all listeners on the iframe prior to
 891                 // its destruction.
 892                 YAHOO.util.Event.removeListener(io, "load");
 893                 // Destroy the iframe facilitating the transaction.
 894                 document.body.removeChild(io);
 895
 896                 if(isTimeout){
 897                     window.clearTimeout(this._timeOut[o.tId]);
 898                     delete this._timeOut[o.tId];
 899                 }
 900
 901                 abortStatus = true;
 902             }
 903         }
 904         else{
 905             abortStatus = false;
 906         }
 907
 908         if(abortStatus === true){
 909             // Fire global custom event -- abortEvent
 910             this.abortEvent.fire(o, args);
 911
 912             if(o.abortEvent){
 913                 // Fire transaction custom event -- abortEvent
 914                 o.abortEvent.fire(o, args);
 915             }
 916
 917             this.handleTransactionResponse(o, callback, true);
 918         }
 919
 920         return abortStatus;
 921     },
 922
 923   /**
 924    * @description Determines if the transaction is still being processed.
 925    * @method isCallInProgress
 926    * @public
 927    * @static
 928    * @param {object} o The connection object returned by asyncRequest
 929    * @return {boolean}
 930    */
 931     isCallInProgress:function(o)
 932     {
 933         o = o || {};
 934         // if the XHR object assigned to the transaction has not been dereferenced,
 935         // then check its readyState status.  Otherwise, return false.
 936         if(o.xhr && o.conn){
 937             return o.conn.readyState !== 4 && o.conn.readyState !== 0;
 938         }
 939         else if(o.xdr && o.conn){
 940             return o.conn.isCallInProgress(o.tId);
 941         }
 942         else if(o.upload === true){
 943             return document.getElementById('yuiIO' + o.tId)?true:false;
 944         }
 945         else{
 946             return false;
 947         }
 948     },
 949
 950   /**
 951    * @description Dereference the XHR instance and the connection object after the transaction is completed.
 952    * @method releaseObject
 953    * @private
 954    * @static
 955    * @param {object} o The connection object
 956    * @return {void}
 957    */
 958     releaseObject:function(o)
 959     {
 960         if(o && o.conn){
 961             //dereference the XHR instance.
 962             o.conn = null;
 963
 964
 965             //dereference the connection object.
 966             o = null;
 967         }
 968     }
 969 };
 970
 971 /**
 972   * @for YAHOO.util.Connect
 973   */
 974 (function() {
 975         var YCM = YAHOO.util.Connect, _fn = {};
 976
 977    /**
 978     * @description This method creates and instantiates the Flash transport.
 979     * @method _swf
 980     * @private
 981     * @static
 982     * @param {string} URI to connection.swf.
 983     * @return {void}
 984     */
 985         function _swf(uri) {
 986                 var o = '<object id="YUIConnectionSwf" type="application/x-shockwave-flash" data="' +
 987                                 uri + '" width="0" height="0">' +
 988                                 '<param name="movie" value="' + uri + '">' +
 989                                 '<param name="allowScriptAccess" value="always">' +
 990                                 '</object>',
 991                     c = document.createElement('div');
 992
 993                 document.body.appendChild(c);
 994                 c.innerHTML = o;
 995         }
 996
 997    /**
 998     * @description This method calls the public method on the
 999     * Flash transport to start the XDR transaction.  It is analogous
1000     * to Connection Manager's asyncRequest method.
1001     * @method xdr
1002     * @private
1003     * @static
1004     * @param {object} The transaction object.
1005     * @param {string} HTTP request method.
1006     * @param {string} URI for the transaction.
1007     * @param {object} The transaction's callback object.
1008     * @param {object} The JSON object used as HTTP POST data.
1009     * @return {void}
1010     */
1011         function _xdr(o, m, u, c, d) {
1012                 _fn[parseInt(o.tId)] = { 'o':o, 'c':c };
1013                 if (d) {
1014                         c.method = m;
1015                         c.data = d;
1016                 }
1017
1018                 o.conn.send(u, c, o.tId);
1019         }
1020
1021    /**
1022     * @description This method instantiates the Flash transport and
1023     * establishes a static reference to it, used for all XDR requests.
1024     * @method transport
1025     * @public
1026     * @static
1027     * @param {string} URI to connection.swf.
1028     * @return {void}
1029     */
1030         function _init(uri) {
1031                 _swf(uri);
1032                 YCM._transport = document.getElementById('YUIConnectionSwf');
1033         }
1034
1035         function _xdrReady() {
1036                 YCM.xdrReadyEvent.fire();
1037         }
1038
1039    /**
1040     * @description This method fires the global and transaction start
1041     * events.
1042     * @method _xdrStart
1043     * @private
1044     * @static
1045     * @param {object} The transaction object.
1046     * @param {string} The transaction's callback object.
1047     * @return {void}
1048     */
1049         function _xdrStart(o, cb) {
1050                 if (o) {
1051                         // Fire global custom event -- startEvent
1052                         YCM.startEvent.fire(o, cb.argument);
1053
1054                         if(o.startEvent){
1055                                 // Fire transaction custom event -- startEvent
1056                                 o.startEvent.fire(o, cb.argument);
1057                         }
1058                 }
1059         }
1060
1061    /**
1062     * @description This method is the initial response handler
1063     * for XDR transactions.  The Flash transport calls this
1064     * function and sends the response payload.
1065     * @method handleXdrResponse
1066     * @private
1067     * @static
1068     * @param {object} The response object sent from the Flash transport.
1069     * @return {void}
1070     */
1071         function _handleXdrResponse(r) {
1072                 var o = _fn[r.tId].o,
1073                         cb = _fn[r.tId].c;
1074
1075                 if (r.statusText === 'xdr:start') {
1076                         _xdrStart(o, cb);
1077                         return;
1078                 }
1079
1080                 r.responseText = decodeURI(r.responseText);
1081                 o.r = r;
1082                 if (cb.argument) {
1083                         o.r.argument = cb.argument;
1084                 }
1085
1086                 this.handleTransactionResponse(o, cb, r.statusText === 'xdr:abort' ? true : false);
1087                 delete _fn[r.tId];
1088         }
1089
1090         // Bind the functions to Connection Manager as static fields.
1091         YCM.xdr = _xdr;
1092         YCM.swf = _swf;
1093         YCM.transport = _init;
1094         YCM.xdrReadyEvent = new YAHOO.util.CustomEvent('xdrReady');
1095         YCM.xdrReady = _xdrReady;
1096         YCM.handleXdrResponse = _handleXdrResponse;
1097 })();
1098
1099 /**
1100   * @for YAHOO.util.Connect
1101   */
1102 (function(){
1103         var YCM = YAHOO.util.Connect,
1104                 YE = YAHOO.util.Event,
1105                 dM = document.documentMode ? document.documentMode : false;
1106
1107    /**
1108         * @description Property modified by setForm() to determine if a file(s)
1109         * upload is expected.
1110         * @property _isFileUpload
1111         * @private
1112         * @static
1113         * @type boolean
1114         */
1115         YCM._isFileUpload = false;
1116
1117    /**
1118         * @description Property modified by setForm() to set a reference to the HTML
1119         * form node if the desired action is file upload.
1120         * @property _formNode
1121         * @private
1122         * @static
1123         * @type object
1124         */
1125         YCM._formNode = null;
1126
1127    /**
1128         * @description Property modified by setForm() to set the HTML form data
1129         * for each transaction.
1130         * @property _sFormData
1131         * @private
1132         * @static
1133         * @type string
1134         */
1135         YCM._sFormData = null;
1136
1137    /**
1138         * @description Tracks the name-value pair of the "clicked" submit button if multiple submit
1139         * buttons are present in an HTML form; and, if YAHOO.util.Event is available.
1140         * @property _submitElementValue
1141         * @private
1142         * @static
1143         * @type string
1144         */
1145         YCM._submitElementValue = null;
1146
1147    /**
1148     * @description Custom event that fires when handleTransactionResponse() determines a
1149     * response in the HTTP 4xx/5xx range.
1150     * @property failureEvent
1151     * @private
1152     * @static
1153     * @type CustomEvent
1154     */
1155         YCM.uploadEvent = new YAHOO.util.CustomEvent('upload');
1156
1157    /**
1158         * @description Determines whether YAHOO.util.Event is available and returns true or false.
1159         * If true, an event listener is bound at the document level to trap click events that
1160         * resolve to a target type of "Submit".  This listener will enable setForm() to determine
1161         * the clicked "Submit" value in a multi-Submit button, HTML form.
1162         * @property _hasSubmitListener
1163         * @private
1164         * @static
1165         */
1166         YCM._hasSubmitListener = function() {
1167                 if(YE){
1168                         YE.addListener(
1169                                 document,
1170                                 'click',
1171                                 function(e){
1172                                         var obj = YE.getTarget(e),
1173                                                 name = obj.nodeName.toLowerCase();
1174
1175                                         if((name === 'input' || name === 'button') && (obj.type && obj.type.toLowerCase() == 'submit')){
1176                                                 YCM._submitElementValue = encodeURIComponent(obj.name) + "=" + encodeURIComponent(obj.value);
1177                                         }
1178                                 });
1179                         return true;
1180                 }
1181                 return false;
1182         }();
1183
1184   /**
1185    * @description This method assembles the form label and value pairs and
1186    * constructs an encoded string.
1187    * asyncRequest() will automatically initialize the transaction with a
1188    * a HTTP header Content-Type of application/x-www-form-urlencoded.
1189    * @method setForm
1190    * @public
1191    * @static
1192    * @param {string || object} form id or name attribute, or form object.
1193    * @param {boolean} optional enable file upload.
1194    * @param {boolean} optional enable file upload over SSL in IE only.
1195    * @return {string} string of the HTML form field name and value pairs..
1196    */
1197         function _setForm(formId, isUpload, secureUri)
1198         {
1199                 var oForm, oElement, oName, oValue, oDisabled,
1200                         hasSubmit = false,
1201                         data = [], item = 0,
1202                         i,len,j,jlen,opt;
1203
1204                 this.resetFormState();
1205
1206                 if(typeof formId == 'string'){
1207                         // Determine if the argument is a form id or a form name.
1208                         // Note form name usage is deprecated by supported
1209                         // here for legacy reasons.
1210                         oForm = (document.getElementById(formId) || document.forms[formId]);
1211                 }
1212                 else if(typeof formId == 'object'){
1213                         // Treat argument as an HTML form object.
1214                         oForm = formId;
1215                 }
1216                 else{
1217                         return;
1218                 }
1219
1220                 // If the isUpload argument is true, setForm will call createFrame to initialize
1221                 // an iframe as the form target.
1222                 //
1223                 // The argument secureURI is also required by IE in SSL environments
1224                 // where the secureURI string is a fully qualified HTTP path, used to set the source
1225                 // of the iframe, to a stub resource in the same domain.
1226                 if(isUpload){
1227
1228                         // Create iframe in preparation for file upload.
1229                         this.createFrame(secureUri?secureUri:null);
1230
1231                         // Set form reference and file upload properties to true.
1232                         this._isFormSubmit = true;
1233                         this._isFileUpload = true;
1234                         this._formNode = oForm;
1235
1236                         return;
1237                 }
1238
1239                 // Iterate over the form elements collection to construct the
1240                 // label-value pairs.
1241                 for (i=0,len=oForm.elements.length; i<len; ++i){
1242                         oElement  = oForm.elements[i];
1243                         oDisabled = oElement.disabled;
1244                         oName     = oElement.name;
1245
1246                         // Do not submit fields that are disabled or
1247                         // do not have a name attribute value.
1248                         if(!oDisabled && oName)
1249                         {
1250                                 oName  = encodeURIComponent(oName)+'=';
1251                                 oValue = encodeURIComponent(oElement.value);
1252
1253                                 switch(oElement.type)
1254                                 {
1255                                         // Safari, Opera, FF all default opt.value from .text if
1256                                         // value attribute not specified in markup
1257                                         case 'select-one':
1258                                                 if (oElement.selectedIndex > -1) {
1259                                                         opt = oElement.options[oElement.selectedIndex];
1260                                                         data[item++] = oName + encodeURIComponent(
1261                                                                 (opt.attributes.value && opt.attributes.value.specified) ? opt.value : opt.text);
1262                                                 }
1263                                                 break;
1264                                         case 'select-multiple':
1265                                                 if (oElement.selectedIndex > -1) {
1266                                                         for(j=oElement.selectedIndex, jlen=oElement.options.length; j<jlen; ++j){
1267                                                                 opt = oElement.options[j];
1268                                                                 if (opt.selected) {
1269                                                                         data[item++] = oName + encodeURIComponent(
1270                                                                                 (opt.attributes.value && opt.attributes.value.specified) ? opt.value : opt.text);
1271                                                                 }
1272                                                         }
1273                                                 }
1274                                                 break;
1275                                         case 'radio':
1276                                         case 'checkbox':
1277                                                 if(oElement.checked){
1278                                                         data[item++] = oName + oValue;
1279                                                 }
1280                                                 break;
1281                                         case 'file':
1282                                                 // stub case as XMLHttpRequest will only send the file path as a string.
1283                                         case undefined:
1284                                                 // stub case for fieldset element which returns undefined.
1285                                         case 'reset':
1286                                                 // stub case for input type reset button.
1287                                         case 'button':
1288                                                 // stub case for input type button elements.
1289                                                 break;
1290                                         case 'submit':
1291                                                 if(hasSubmit === false){
1292                                                         if(this._hasSubmitListener && this._submitElementValue){
1293                                                                 data[item++] = this._submitElementValue;
1294                                                         }
1295                                                         hasSubmit = true;
1296                                                 }
1297                                                 break;
1298                                         default:
1299                                                 data[item++] = oName + oValue;
1300                                 }
1301                         }
1302                 }
1303
1304                 this._isFormSubmit = true;
1305                 this._sFormData = data.join('&');
1306
1307
1308                 this.initHeader('Content-Type', this._default_form_header);
1309
1310                 return this._sFormData;
1311         }
1312
1313    /**
1314     * @description Resets HTML form properties when an HTML form or HTML form
1315     * with file upload transaction is sent.
1316     * @method resetFormState
1317     * @private
1318     * @static
1319     * @return {void}
1320     */
1321         function _resetFormState(){
1322                 this._isFormSubmit = false;
1323                 this._isFileUpload = false;
1324                 this._formNode = null;
1325                 this._sFormData = "";
1326         }
1327
1328
1329    /**
1330     * @description Creates an iframe to be used for form file uploads.  It is remove from the
1331     * document upon completion of the upload transaction.
1332     * @method createFrame
1333     * @private
1334     * @static
1335     * @param {string} optional qualified path of iframe resource for SSL in IE.
1336     * @return {void}
1337     */
1338         function _createFrame(secureUri){
1339
1340                 // IE does not allow the setting of id and name attributes as object
1341                 // properties via createElement().  A different iframe creation
1342                 // pattern is required for IE.
1343                 var frameId = 'yuiIO' + this._transaction_id,
1344                         ie9 = (dM === 9) ? true : false,
1345                         io;
1346
1347                 if(YAHOO.env.ua.ie && !ie9){
1348                         io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
1349
1350                         // IE will throw a security exception in an SSL environment if the
1351                         // iframe source is undefined.
1352                         if(typeof secureUri == 'boolean'){
1353                                 io.src = 'javascript:false';
1354                         }
1355                 }
1356                 else{
1357                         io = document.createElement('iframe');
1358                         io.id = frameId;
1359                         io.name = frameId;
1360                 }
1361
1362                 io.style.position = 'absolute';
1363                 io.style.top = '-1000px';
1364                 io.style.left = '-1000px';
1365
1366                 document.body.appendChild(io);
1367         }
1368
1369    /**
1370     * @description Parses the POST data and creates hidden form elements
1371     * for each key-value, and appends them to the HTML form object.
1372     * @method appendPostData
1373     * @private
1374     * @static
1375     * @param {string} postData The HTTP POST data
1376     * @return {array} formElements Collection of hidden fields.
1377     */
1378         function _appendPostData(postData){
1379                 var formElements = [],
1380                         postMessage = postData.split('&'),
1381                         i, delimitPos;
1382
1383                 for(i=0; i < postMessage.length; i++){
1384                         delimitPos = postMessage[i].indexOf('=');
1385                         if(delimitPos != -1){
1386                                 formElements[i] = document.createElement('input');
1387                                 formElements[i].type = 'hidden';
1388                                 formElements[i].name = decodeURIComponent(postMessage[i].substring(0,delimitPos));
1389                                 formElements[i].value = decodeURIComponent(postMessage[i].substring(delimitPos+1));
1390                                 this._formNode.appendChild(formElements[i]);
1391                         }
1392                 }
1393
1394                 return formElements;
1395         }
1396
1397    /**
1398     * @description Uploads HTML form, inclusive of files/attachments, using the
1399     * iframe created in createFrame to facilitate the transaction.
1400     * @method uploadFile
1401     * @private
1402     * @static
1403     * @param {int} id The transaction id.
1404     * @param {object} callback User-defined callback object.
1405     * @param {string} uri Fully qualified path of resource.
1406     * @param {string} postData POST data to be submitted in addition to HTML form.
1407     * @return {void}
1408     */
1409         function _uploadFile(o, callback, uri, postData){
1410                 // Each iframe has an id prefix of "yuiIO" followed
1411                 // by the unique transaction id.
1412                 var frameId = 'yuiIO' + o.tId,
1413                     uploadEncoding = 'multipart/form-data',
1414                     io = document.getElementById(frameId),
1415                     ie8 = (dM >= 8) ? true : false,
1416                     oConn = this,
1417                         args = (callback && callback.argument)?callback.argument:null,
1418             oElements,i,prop,obj, rawFormAttributes, uploadCallback;
1419
1420                 // Track original HTML form attribute values.
1421                 rawFormAttributes = {
1422                         action:this._formNode.getAttribute('action'),
1423                         method:this._formNode.getAttribute('method'),
1424                         target:this._formNode.getAttribute('target')
1425                 };
1426
1427                 // Initialize the HTML form properties in case they are
1428                 // not defined in the HTML form.
1429                 this._formNode.setAttribute('action', uri);
1430                 this._formNode.setAttribute('method', 'POST');
1431                 this._formNode.setAttribute('target', frameId);
1432
1433                 if(YAHOO.env.ua.ie && !ie8){
1434                         // IE does not respect property enctype for HTML forms.
1435                         // Instead it uses the property - "encoding".
1436                         this._formNode.setAttribute('encoding', uploadEncoding);
1437                 }
1438                 else{
1439                         this._formNode.setAttribute('enctype', uploadEncoding);
1440                 }
1441
1442                 if(postData){
1443                         oElements = this.appendPostData(postData);
1444                 }
1445
1446                 // Start file upload.
1447                 this._formNode.submit();
1448
1449                 // Fire global custom event -- startEvent
1450                 this.startEvent.fire(o, args);
1451
1452                 if(o.startEvent){
1453                         // Fire transaction custom event -- startEvent
1454                         o.startEvent.fire(o, args);
1455                 }
1456
1457                 // Start polling if a callback is present and the timeout
1458                 // property has been defined.
1459                 if(callback && callback.timeout){
1460                         this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
1461                 }
1462
1463                 // Remove HTML elements created by appendPostData
1464                 if(oElements && oElements.length > 0){
1465                         for(i=0; i < oElements.length; i++){
1466                                 this._formNode.removeChild(oElements[i]);
1467                         }
1468                 }
1469
1470                 // Restore HTML form attributes to their original
1471                 // values prior to file upload.
1472                 for(prop in rawFormAttributes){
1473                         if(YAHOO.lang.hasOwnProperty(rawFormAttributes, prop)){
1474                                 if(rawFormAttributes[prop]){
1475                                         this._formNode.setAttribute(prop, rawFormAttributes[prop]);
1476                                 }
1477                                 else{
1478                                         this._formNode.removeAttribute(prop);
1479                                 }
1480                         }
1481                 }
1482
1483                 // Reset HTML form state properties.
1484                 this.resetFormState();
1485
1486                 // Create the upload callback handler that fires when the iframe
1487                 // receives the load event.  Subsequently, the event handler is detached
1488                 // and the iframe removed from the document.
1489                 uploadCallback = function() {
1490                         var body, pre, text;
1491
1492                         if(callback && callback.timeout){
1493                                 window.clearTimeout(oConn._timeOut[o.tId]);
1494                                 delete oConn._timeOut[o.tId];
1495                         }
1496
1497                         // Fire global custom event -- completeEvent
1498                         oConn.completeEvent.fire(o, args);
1499
1500                         if(o.completeEvent){
1501                                 // Fire transaction custom event -- completeEvent
1502                                 o.completeEvent.fire(o, args);
1503                         }
1504
1505                         obj = {
1506                             tId : o.tId,
1507                             argument : args
1508             };
1509
1510                         try
1511                         {
1512                                 body = io.contentWindow.document.getElementsByTagName('body')[0];
1513                                 pre = io.contentWindow.document.getElementsByTagName('pre')[0];
1514
1515                                 if (body) {
1516                                         if (pre) {
1517                                                 text = pre.textContent?pre.textContent:pre.innerText;
1518                                         }
1519                                         else {
1520                                                 text = body.textContent?body.textContent:body.innerText;
1521                                         }
1522                                 }
1523                                 obj.responseText = text;
1524                                 // responseText and responseXML will be populated with the same data from the iframe.
1525                                 // Since the HTTP headers cannot be read from the iframe
1526                                 obj.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
1527                         }
1528                         catch(e){}
1529
1530                         if(callback && callback.upload){
1531                                 if(!callback.scope){
1532                                         callback.upload(obj);
1533                                 }
1534                                 else{
1535                                         callback.upload.apply(callback.scope, [obj]);
1536                                 }
1537                         }
1538
1539                         // Fire global custom event -- uploadEvent
1540                         oConn.uploadEvent.fire(obj);
1541
1542                         if(o.uploadEvent){
1543                                 // Fire transaction custom event -- uploadEvent
1544                                 o.uploadEvent.fire(obj);
1545                         }
1546
1547                         YE.removeListener(io, "load", uploadCallback);
1548
1549                         setTimeout(
1550                                 function(){
1551                                         document.body.removeChild(io);
1552                                         oConn.releaseObject(o);
1553                                 }, 100);
1554                 };
1555
1556                 // Bind the onload handler to the iframe to detect the file upload response.
1557                 YE.addListener(io, "load", uploadCallback);
1558         }
1559
1560         YCM.setForm = _setForm;
1561         YCM.resetFormState = _resetFormState;
1562         YCM.createFrame = _createFrame;
1563         YCM.appendPostData = _appendPostData;
1564         YCM.uploadFile = _uploadFile;
1565 })();
1566
1567 YAHOO.register("connection", YAHOO.util.Connect, {version: "2.9.0", build: "2800"});