wradmin_/wradmin/public/yui/connection/connection-debug.js

   1 /*
   2 Copyright (c) 2009, Yahoo! Inc. All rights reserved.
   3 Code licensed under the BSD License:
   4 http://developer.yahoo.net/yui/license.txt
   5 version: 2.7.0
   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 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 Determines if custom, default headers
 125   * are set for each transaction.
 126   * @property _has_default_header
 127   * @private
 128   * @static
 129   * @type boolean
 130   */
 131     _default_headers:{},
 132
 133  /**
 134   * @description Property modified by setForm() to determine if the data
 135   * should be submitted as an HTML form.
 136   * @property _isFormSubmit
 137   * @private
 138   * @static
 139   * @type boolean
 140   */
 141     _isFormSubmit:false,
 142
 143  /**
 144   * @description Property modified by setForm() to determine if a file(s)
 145   * upload is expected.
 146   * @property _isFileUpload
 147   * @private
 148   * @static
 149   * @type boolean
 150   */
 151     _isFileUpload:false,
 152
 153  /**
 154   * @description Property modified by setForm() to set a reference to the HTML
 155   * form node if the desired action is file upload.
 156   * @property _formNode
 157   * @private
 158   * @static
 159   * @type object
 160   */
 161     _formNode:null,
 162
 163  /**
 164   * @description Property modified by setForm() to set the HTML form data
 165   * for each transaction.
 166   * @property _sFormData
 167   * @private
 168   * @static
 169   * @type string
 170   */
 171     _sFormData:null,
 172
 173  /**
 174   * @description Collection of polling references to the polling mechanism in handleReadyState.
 175   * @property _poll
 176   * @private
 177   * @static
 178   * @type object
 179   */
 180     _poll:{},
 181
 182  /**
 183   * @description Queue of timeout values for each transaction callback with a defined timeout value.
 184   * @property _timeOut
 185   * @private
 186   * @static
 187   * @type object
 188   */
 189     _timeOut:{},
 190
 191   /**
 192    * @description The polling frequency, in milliseconds, for HandleReadyState.
 193    * when attempting to determine a transaction's XHR readyState.
 194    * The default is 50 milliseconds.
 195    * @property _polling_interval
 196    * @private
 197    * @static
 198    * @type int
 199    */
 200      _polling_interval:50,
 201
 202   /**
 203    * @description A transaction counter that increments the transaction id for each transaction.
 204    * @property _transaction_id
 205    * @private
 206    * @static
 207    * @type int
 208    */
 209      _transaction_id:0,
 210
 211   /**
 212    * @description Tracks the name-value pair of the "clicked" submit button if multiple submit
 213    * buttons are present in an HTML form; and, if YAHOO.util.Event is available.
 214    * @property _submitElementValue
 215    * @private
 216    * @static
 217    * @type string
 218    */
 219          _submitElementValue:null,
 220
 221   /**
 222    * @description Determines whether YAHOO.util.Event is available and returns true or false.
 223    * If true, an event listener is bound at the document level to trap click events that
 224    * resolve to a target type of "Submit".  This listener will enable setForm() to determine
 225    * the clicked "Submit" value in a multi-Submit button, HTML form.
 226    * @property _hasSubmitListener
 227    * @private
 228    * @static
 229    */
 230          _hasSubmitListener:(function()
 231          {
 232                 if(YAHOO.util.Event){
 233                         YAHOO.util.Event.addListener(
 234                                 document,
 235                                 'click',
 236                                 function(e){
 237                                         var obj = YAHOO.util.Event.getTarget(e),
 238                                                 name = obj.nodeName.toLowerCase();
 239                                         if((name === 'input' || name === 'button') && (obj.type && obj.type.toLowerCase() == 'submit')){
 240                                                 YAHOO.util.Connect._submitElementValue = encodeURIComponent(obj.name) + "=" + encodeURIComponent(obj.value);
 241                                         }
 242                                 });
 243                         return true;
 244             }
 245             return false;
 246          })(),
 247
 248   /**
 249    * @description Custom event that fires at the start of a transaction
 250    * @property startEvent
 251    * @private
 252    * @static
 253    * @type CustomEvent
 254    */
 255         startEvent: new YAHOO.util.CustomEvent('start'),
 256
 257   /**
 258    * @description Custom event that fires when a transaction response has completed.
 259    * @property completeEvent
 260    * @private
 261    * @static
 262    * @type CustomEvent
 263    */
 264         completeEvent: new YAHOO.util.CustomEvent('complete'),
 265
 266   /**
 267    * @description Custom event that fires when handleTransactionResponse() determines a
 268    * response in the HTTP 2xx range.
 269    * @property successEvent
 270    * @private
 271    * @static
 272    * @type CustomEvent
 273    */
 274         successEvent: new YAHOO.util.CustomEvent('success'),
 275
 276   /**
 277    * @description Custom event that fires when handleTransactionResponse() determines a
 278    * response in the HTTP 4xx/5xx range.
 279    * @property failureEvent
 280    * @private
 281    * @static
 282    * @type CustomEvent
 283    */
 284         failureEvent: new YAHOO.util.CustomEvent('failure'),
 285
 286   /**
 287    * @description Custom event that fires when handleTransactionResponse() determines a
 288    * response in the HTTP 4xx/5xx range.
 289    * @property failureEvent
 290    * @private
 291    * @static
 292    * @type CustomEvent
 293    */
 294         uploadEvent: new YAHOO.util.CustomEvent('upload'),
 295
 296   /**
 297    * @description Custom event that fires when a transaction is successfully aborted.
 298    * @property abortEvent
 299    * @private
 300    * @static
 301    * @type CustomEvent
 302    */
 303         abortEvent: new YAHOO.util.CustomEvent('abort'),
 304
 305   /**
 306    * @description A reference table that maps callback custom events members to its specific
 307    * event name.
 308    * @property _customEvents
 309    * @private
 310    * @static
 311    * @type object
 312    */
 313         _customEvents:
 314         {
 315                 onStart:['startEvent', 'start'],
 316                 onComplete:['completeEvent', 'complete'],
 317                 onSuccess:['successEvent', 'success'],
 318                 onFailure:['failureEvent', 'failure'],
 319                 onUpload:['uploadEvent', 'upload'],
 320                 onAbort:['abortEvent', 'abort']
 321         },
 322
 323   /**
 324    * @description Member to add an ActiveX id to the existing xml_progid array.
 325    * In the event(unlikely) a new ActiveX id is introduced, it can be added
 326    * without internal code modifications.
 327    * @method setProgId
 328    * @public
 329    * @static
 330    * @param {string} id The ActiveX id to be added to initialize the XHR object.
 331    * @return void
 332    */
 333         setProgId:function(id)
 334         {
 335                 this._msxml_progid.unshift(id);
 336                 YAHOO.log('ActiveX Program Id  ' + id + ' added to _msxml_progid.', 'info', 'Connection');
 337         },
 338
 339   /**
 340    * @description Member to override the default POST header.
 341    * @method setDefaultPostHeader
 342    * @public
 343    * @static
 344    * @param {boolean} b Set and use default header - true or false .
 345    * @return void
 346    */
 347         setDefaultPostHeader:function(b)
 348         {
 349                 if(typeof b == 'string'){
 350                         this._default_post_header = b;
 351                         YAHOO.log('Default POST header set to  ' + b, 'info', 'Connection');
 352                 }
 353                 else if(typeof b == 'boolean'){
 354                         this._use_default_post_header = b;
 355                 }
 356         },
 357
 358   /**
 359    * @description Member to override the default transaction header..
 360    * @method setDefaultXhrHeader
 361    * @public
 362    * @static
 363    * @param {boolean} b Set and use default header - true or false .
 364    * @return void
 365    */
 366         setDefaultXhrHeader:function(b)
 367         {
 368                 if(typeof b == 'string'){
 369                         this._default_xhr_header = b;
 370                         YAHOO.log('Default XHR header set to  ' + b, 'info', 'Connection');
 371                 }
 372                 else{
 373                         this._use_default_xhr_header = b;
 374                 }
 375         },
 376
 377   /**
 378    * @description Member to modify the default polling interval.
 379    * @method setPollingInterval
 380    * @public
 381    * @static
 382    * @param {int} i The polling interval in milliseconds.
 383    * @return void
 384    */
 385         setPollingInterval:function(i)
 386         {
 387                 if(typeof i == 'number' && isFinite(i)){
 388                         this._polling_interval = i;
 389                         YAHOO.log('Default polling interval set to ' + i +'ms', 'info', 'Connection');
 390                 }
 391         },
 392
 393   /**
 394    * @description Instantiates a XMLHttpRequest object and returns an object with two properties:
 395    * the XMLHttpRequest instance and the transaction id.
 396    * @method createXhrObject
 397    * @private
 398    * @static
 399    * @param {int} transactionId Property containing the transaction id for this transaction.
 400    * @return object
 401    */
 402         createXhrObject:function(transactionId)
 403         {
 404                 var obj,http;
 405                 try
 406                 {
 407                         // Instantiates XMLHttpRequest in non-IE browsers and assigns to http.
 408                         http = new XMLHttpRequest();
 409                         //  Object literal with http and tId properties
 410                         obj = { conn:http, tId:transactionId };
 411                         YAHOO.log('XHR object created for transaction ' + transactionId, 'info', 'Connection');
 412                 }
 413                 catch(e)
 414                 {
 415                         for(var i=0; i<this._msxml_progid.length; ++i){
 416                                 try
 417                                 {
 418                                         // Instantiates XMLHttpRequest for IE and assign to http
 419                                         http = new ActiveXObject(this._msxml_progid[i]);
 420                                         //  Object literal with conn and tId properties
 421                                         obj = { conn:http, tId:transactionId };
 422                                         YAHOO.log('ActiveX XHR object created for transaction ' + transactionId, 'info', 'Connection');
 423                                         break;
 424                                 }
 425                                 catch(e2){}
 426                         }
 427                 }
 428                 finally
 429                 {
 430                         return obj;
 431                 }
 432         },
 433
 434   /**
 435    * @description This method is called by asyncRequest to create a
 436    * valid connection object for the transaction.  It also passes a
 437    * transaction id and increments the transaction id counter.
 438    * @method getConnectionObject
 439    * @private
 440    * @static
 441    * @return {object}
 442    */
 443         getConnectionObject:function(isFileUpload)
 444         {
 445                 var o;
 446                 var tId = this._transaction_id;
 447
 448                 try
 449                 {
 450                         if(!isFileUpload){
 451                                 o = this.createXhrObject(tId);
 452                         }
 453                         else{
 454                                 o = {};
 455                                 o.tId = tId;
 456                                 o.isUpload = true;
 457                         }
 458
 459                         if(o){
 460                                 this._transaction_id++;
 461                         }
 462                 }
 463                 catch(e){}
 464                 finally
 465                 {
 466                         return o;
 467                 }
 468         },
 469
 470   /**
 471    * @description Method for initiating an asynchronous request via the XHR object.
 472    * @method asyncRequest
 473    * @public
 474    * @static
 475    * @param {string} method HTTP transaction method
 476    * @param {string} uri Fully qualified path of resource
 477    * @param {callback} callback User-defined callback function or object
 478    * @param {string} postData POST body
 479    * @return {object} Returns the connection object
 480    */
 481         asyncRequest:function(method, uri, callback, postData)
 482         {
 483                 var o = (this._isFileUpload)?this.getConnectionObject(true):this.getConnectionObject();
 484                 var args = (callback && callback.argument)?callback.argument:null;
 485
 486                 if(!o){
 487                         YAHOO.log('Unable to create connection object.', 'error', 'Connection');
 488                         return null;
 489                 }
 490                 else{
 491
 492                         // Intialize any transaction-specific custom events, if provided.
 493                         if(callback && callback.customevents){
 494                                 this.initCustomEvents(o, callback);
 495                         }
 496
 497                         if(this._isFormSubmit){
 498                                 if(this._isFileUpload){
 499                                         this.uploadFile(o, callback, uri, postData);
 500                                         return o;
 501                                 }
 502
 503                                 // If the specified HTTP method is GET, setForm() will return an
 504                                 // encoded string that is concatenated to the uri to
 505                                 // create a querystring.
 506                                 if(method.toUpperCase() == 'GET'){
 507                                         if(this._sFormData.length !== 0){
 508                                                 // If the URI already contains a querystring, append an ampersand
 509                                                 // and then concatenate _sFormData to the URI.
 510                                                 uri += ((uri.indexOf('?') == -1)?'?':'&') + this._sFormData;
 511                                         }
 512                                 }
 513                                 else if(method.toUpperCase() == 'POST'){
 514                                         // If POST data exist in addition to the HTML form data,
 515                                         // it will be concatenated to the form data.
 516                                         postData = postData?this._sFormData + "&" + postData:this._sFormData;
 517                                 }
 518                         }
 519
 520                         if(method.toUpperCase() == 'GET' && (callback && callback.cache === false)){
 521                                 // If callback.cache is defined and set to false, a
 522                                 // timestamp value will be added to the querystring.
 523                                 uri += ((uri.indexOf('?') == -1)?'?':'&') + "rnd=" + new Date().valueOf().toString();
 524                         }
 525
 526                         o.conn.open(method, uri, true);
 527
 528                         // Each transaction will automatically include a custom header of
 529                         // "X-Requested-With: XMLHttpRequest" to identify the request as
 530                         // having originated from Connection Manager.
 531                         if(this._use_default_xhr_header){
 532                                 if(!this._default_headers['X-Requested-With']){
 533                                         this.initHeader('X-Requested-With', this._default_xhr_header, true);
 534                                         YAHOO.log('Initialize transaction header X-Request-Header to XMLHttpRequest.', 'info', 'Connection');
 535                                 }
 536                         }
 537
 538                         //If the transaction method is POST and the POST header value is set to true
 539                         //or a custom value, initalize the Content-Type header to this value.
 540                         if((method.toUpperCase() === 'POST' && this._use_default_post_header) && this._isFormSubmit === false){
 541                                 this.initHeader('Content-Type', this._default_post_header);
 542                                 YAHOO.log('Initialize header Content-Type to application/x-www-form-urlencoded; UTF-8 for POST transaction.', 'info', 'Connection');
 543                         }
 544
 545                         //Initialize all default and custom HTTP headers,
 546                         if(this._has_default_headers || this._has_http_headers){
 547                                 this.setHeader(o);
 548                         }
 549
 550                         this.handleReadyState(o, callback);
 551                         o.conn.send(postData || '');
 552                         YAHOO.log('Transaction ' + o.tId + ' sent.', 'info', 'Connection');
 553
 554
 555                         // Reset the HTML form data and state properties as
 556                         // soon as the data are submitted.
 557                         if(this._isFormSubmit === true){
 558                                 this.resetFormState();
 559                         }
 560
 561                         // Fire global custom event -- startEvent
 562                         this.startEvent.fire(o, args);
 563
 564                         if(o.startEvent){
 565                                 // Fire transaction custom event -- startEvent
 566                                 o.startEvent.fire(o, args);
 567                         }
 568
 569                         return o;
 570                 }
 571         },
 572
 573   /**
 574    * @description This method creates and subscribes custom events,
 575    * specific to each transaction
 576    * @method initCustomEvents
 577    * @private
 578    * @static
 579    * @param {object} o The connection object
 580    * @param {callback} callback The user-defined callback object
 581    * @return {void}
 582    */
 583         initCustomEvents:function(o, callback)
 584         {
 585                 var prop;
 586                 // Enumerate through callback.customevents members and bind/subscribe
 587                 // events that match in the _customEvents table.
 588                 for(prop in callback.customevents){
 589                         if(this._customEvents[prop][0]){
 590                                 // Create the custom event
 591                                 o[this._customEvents[prop][0]] = new YAHOO.util.CustomEvent(this._customEvents[prop][1], (callback.scope)?callback.scope:null);
 592                                 YAHOO.log('Transaction-specific Custom Event ' + o[this._customEvents[prop][1]] + ' created.', 'info', 'Connection');
 593
 594                                 // Subscribe the custom event
 595                                 o[this._customEvents[prop][0]].subscribe(callback.customevents[prop]);
 596                                 YAHOO.log('Transaction-specific Custom Event ' + o[this._customEvents[prop][1]] + ' subscribed.', 'info', 'Connection');
 597                         }
 598                 }
 599         },
 600
 601   /**
 602    * @description This method serves as a timer that polls the XHR object's readyState
 603    * property during a transaction, instead of binding a callback to the
 604    * onreadystatechange event.  Upon readyState 4, handleTransactionResponse
 605    * will process the response, and the timer will be cleared.
 606    * @method handleReadyState
 607    * @private
 608    * @static
 609    * @param {object} o The connection object
 610    * @param {callback} callback The user-defined callback object
 611    * @return {void}
 612    */
 613
 614     handleReadyState:function(o, callback)
 615
 616     {
 617                 var oConn = this;
 618                 var args = (callback && callback.argument)?callback.argument:null;
 619
 620                 if(callback && callback.timeout){
 621                         this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
 622                 }
 623
 624                 this._poll[o.tId] = window.setInterval(
 625                         function(){
 626                                 if(o.conn && o.conn.readyState === 4){
 627
 628                                         // Clear the polling interval for the transaction
 629                                         // and remove the reference from _poll.
 630                                         window.clearInterval(oConn._poll[o.tId]);
 631                                         delete oConn._poll[o.tId];
 632
 633                                         if(callback && callback.timeout){
 634                                                 window.clearTimeout(oConn._timeOut[o.tId]);
 635                                                 delete oConn._timeOut[o.tId];
 636                                         }
 637
 638                                         // Fire global custom event -- completeEvent
 639                                         oConn.completeEvent.fire(o, args);
 640
 641                                         if(o.completeEvent){
 642                                                 // Fire transaction custom event -- completeEvent
 643                                                 o.completeEvent.fire(o, args);
 644                                         }
 645
 646                                         oConn.handleTransactionResponse(o, callback);
 647                                 }
 648                         }
 649                 ,this._polling_interval);
 650     },
 651
 652   /**
 653    * @description This method attempts to interpret the server response and
 654    * determine whether the transaction was successful, or if an error or
 655    * exception was encountered.
 656    * @method handleTransactionResponse
 657    * @private
 658    * @static
 659    * @param {object} o The connection object
 660    * @param {object} callback The user-defined callback object
 661    * @param {boolean} isAbort Determines if the transaction was terminated via abort().
 662    * @return {void}
 663    */
 664     handleTransactionResponse:function(o, callback, isAbort)
 665     {
 666                 var httpStatus, responseObject;
 667                 var args = (callback && callback.argument)?callback.argument:null;
 668
 669                 try
 670                 {
 671                         if(o.conn.status !== undefined && o.conn.status !== 0){
 672                                 httpStatus = o.conn.status;
 673                         }
 674                         else{
 675                                 httpStatus = 13030;
 676                         }
 677                 }
 678                 catch(e){
 679
 680                          // 13030 is a custom code to indicate the condition -- in Mozilla/FF --
 681                          // when the XHR object's status and statusText properties are
 682                          // unavailable, and a query attempt throws an exception.
 683                         httpStatus = 13030;
 684                 }
 685
 686                 if(httpStatus >= 200 && httpStatus < 300 || httpStatus === 1223){
 687                         responseObject = this.createResponseObject(o, args);
 688                         if(callback && callback.success){
 689                                 if(!callback.scope){
 690                                         callback.success(responseObject);
 691                                         YAHOO.log('Success callback. HTTP code is ' + httpStatus, 'info', 'Connection');
 692                                 }
 693                                 else{
 694                                         // If a scope property is defined, the callback will be fired from
 695                                         // the context of the object.
 696                                         callback.success.apply(callback.scope, [responseObject]);
 697                                         YAHOO.log('Success callback with scope. HTTP code is ' + httpStatus, 'info', 'Connection');
 698                                 }
 699                         }
 700
 701                         // Fire global custom event -- successEvent
 702                         this.successEvent.fire(responseObject);
 703
 704                         if(o.successEvent){
 705                                 // Fire transaction custom event -- successEvent
 706                                 o.successEvent.fire(responseObject);
 707                         }
 708                 }
 709                 else{
 710                         switch(httpStatus){
 711                                 // The following cases are wininet.dll error codes that may be encountered.
 712                                 case 12002: // Server timeout
 713                                 case 12029: // 12029 to 12031 correspond to dropped connections.
 714                                 case 12030:
 715                                 case 12031:
 716                                 case 12152: // Connection closed by server.
 717                                 case 13030: // See above comments for variable status.
 718                                         responseObject = this.createExceptionObject(o.tId, args, (isAbort?isAbort:false));
 719                                         if(callback && callback.failure){
 720                                                 if(!callback.scope){
 721                                                         callback.failure(responseObject);
 722                                                         YAHOO.log('Failure callback. Exception detected. Status code is ' + httpStatus, 'warn', 'Connection');
 723                                                 }
 724                                                 else{
 725                                                         callback.failure.apply(callback.scope, [responseObject]);
 726                                                         YAHOO.log('Failure callback with scope. Exception detected. Status code is ' + httpStatus, 'warn', 'Connection');
 727                                                 }
 728                                         }
 729
 730                                         break;
 731                                 default:
 732                                         responseObject = this.createResponseObject(o, args);
 733                                         if(callback && callback.failure){
 734                                                 if(!callback.scope){
 735                                                         callback.failure(responseObject);
 736                                                         YAHOO.log('Failure callback. HTTP status code is ' + httpStatus, 'warn', 'Connection');
 737                                                 }
 738                                                 else{
 739                                                         callback.failure.apply(callback.scope, [responseObject]);
 740                                                         YAHOO.log('Failure callback with scope. HTTP status code is ' + httpStatus, 'warn', 'Connection');
 741                                                 }
 742                                         }
 743                         }
 744
 745                         // Fire global custom event -- failureEvent
 746                         this.failureEvent.fire(responseObject);
 747
 748                         if(o.failureEvent){
 749                                 // Fire transaction custom event -- failureEvent
 750                                 o.failureEvent.fire(responseObject);
 751                         }
 752
 753                 }
 754
 755                 this.releaseObject(o);
 756                 responseObject = null;
 757     },
 758
 759   /**
 760    * @description This method evaluates the server response, creates and returns the results via
 761    * its properties.  Success and failure cases will differ in the response
 762    * object's property values.
 763    * @method createResponseObject
 764    * @private
 765    * @static
 766    * @param {object} o The connection object
 767    * @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
 768    * @return {object}
 769    */
 770     createResponseObject:function(o, callbackArg)
 771     {
 772                 var obj = {};
 773                 var headerObj = {};
 774
 775                 try
 776                 {
 777                         var headerStr = o.conn.getAllResponseHeaders();
 778                         var header = headerStr.split('\n');
 779                         for(var i=0; i<header.length; i++){
 780                                 var delimitPos = header[i].indexOf(':');
 781                                 if(delimitPos != -1){
 782                                         headerObj[header[i].substring(0,delimitPos)] = header[i].substring(delimitPos+2);
 783                                 }
 784                         }
 785                 }
 786                 catch(e){}
 787
 788                 obj.tId = o.tId;
 789                 // Normalize IE's response to HTTP 204 when Win error 1223.
 790                 obj.status = (o.conn.status == 1223)?204:o.conn.status;
 791                 // Normalize IE's statusText to "No Content" instead of "Unknown".
 792                 obj.statusText = (o.conn.status == 1223)?"No Content":o.conn.statusText;
 793                 obj.getResponseHeader = headerObj;
 794                 obj.getAllResponseHeaders = headerStr;
 795                 obj.responseText = o.conn.responseText;
 796                 obj.responseXML = o.conn.responseXML;
 797
 798                 if(callbackArg){
 799                         obj.argument = callbackArg;
 800                 }
 801
 802                 return obj;
 803     },
 804
 805   /**
 806    * @description If a transaction cannot be completed due to dropped or closed connections,
 807    * there may be not be enough information to build a full response object.
 808    * The failure callback will be fired and this specific condition can be identified
 809    * by a status property value of 0.
 810    *
 811    * If an abort was successful, the status property will report a value of -1.
 812    *
 813    * @method createExceptionObject
 814    * @private
 815    * @static
 816    * @param {int} tId The Transaction Id
 817    * @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
 818    * @param {boolean} isAbort Determines if the exception case is caused by a transaction abort
 819    * @return {object}
 820    */
 821     createExceptionObject:function(tId, callbackArg, isAbort)
 822     {
 823                 var COMM_CODE = 0;
 824                 var COMM_ERROR = 'communication failure';
 825                 var ABORT_CODE = -1;
 826                 var ABORT_ERROR = 'transaction aborted';
 827
 828                 var obj = {};
 829
 830                 obj.tId = tId;
 831                 if(isAbort){
 832                         obj.status = ABORT_CODE;
 833                         obj.statusText = ABORT_ERROR;
 834                 }
 835                 else{
 836                         obj.status = COMM_CODE;
 837                         obj.statusText = COMM_ERROR;
 838                 }
 839
 840                 if(callbackArg){
 841                         obj.argument = callbackArg;
 842                 }
 843
 844                 return obj;
 845     },
 846
 847   /**
 848    * @description Method that initializes the custom HTTP headers for the each transaction.
 849    * @method initHeader
 850    * @public
 851    * @static
 852    * @param {string} label The HTTP header label
 853    * @param {string} value The HTTP header value
 854    * @param {string} isDefault Determines if the specific header is a default header
 855    * automatically sent with each transaction.
 856    * @return {void}
 857    */
 858         initHeader:function(label, value, isDefault)
 859         {
 860                 var headerObj = (isDefault)?this._default_headers:this._http_headers;
 861                 headerObj[label] = value;
 862
 863                 if(isDefault){
 864                         this._has_default_headers = true;
 865                 }
 866                 else{
 867                         this._has_http_headers = true;
 868                 }
 869         },
 870
 871
 872   /**
 873    * @description Accessor that sets the HTTP headers for each transaction.
 874    * @method setHeader
 875    * @private
 876    * @static
 877    * @param {object} o The connection object for the transaction.
 878    * @return {void}
 879    */
 880         setHeader:function(o)
 881         {
 882                 var prop;
 883                 if(this._has_default_headers){
 884                         for(prop in this._default_headers){
 885                                 if(YAHOO.lang.hasOwnProperty(this._default_headers, prop)){
 886                                         o.conn.setRequestHeader(prop, this._default_headers[prop]);
 887                                         YAHOO.log('Default HTTP header ' + prop + ' set with value of ' + this._default_headers[prop], 'info', 'Connection');
 888                                 }
 889                         }
 890                 }
 891
 892                 if(this._has_http_headers){
 893                         for(prop in this._http_headers){
 894                                 if(YAHOO.lang.hasOwnProperty(this._http_headers, prop)){
 895                                         o.conn.setRequestHeader(prop, this._http_headers[prop]);
 896                                         YAHOO.log('HTTP header ' + prop + ' set with value of ' + this._http_headers[prop], 'info', 'Connection');
 897                                 }
 898                         }
 899                         delete this._http_headers;
 900
 901                         this._http_headers = {};
 902                         this._has_http_headers = false;
 903                 }
 904         },
 905
 906   /**
 907    * @description Resets the default HTTP headers object
 908    * @method resetDefaultHeaders
 909    * @public
 910    * @static
 911    * @return {void}
 912    */
 913         resetDefaultHeaders:function(){
 914                 delete this._default_headers;
 915                 this._default_headers = {};
 916                 this._has_default_headers = false;
 917         },
 918
 919   /**
 920    * @description This method assembles the form label and value pairs and
 921    * constructs an encoded string.
 922    * asyncRequest() will automatically initialize the transaction with a
 923    * a HTTP header Content-Type of application/x-www-form-urlencoded.
 924    * @method setForm
 925    * @public
 926    * @static
 927    * @param {string || object} form id or name attribute, or form object.
 928    * @param {boolean} optional enable file upload.
 929    * @param {boolean} optional enable file upload over SSL in IE only.
 930    * @return {string} string of the HTML form field name and value pairs..
 931    */
 932         setForm:function(formId, isUpload, secureUri)
 933         {
 934         var oForm, oElement, oName, oValue, oDisabled,
 935             hasSubmit = false,
 936             data = [], item = 0,
 937             i,len,j,jlen,opt;
 938
 939                 this.resetFormState();
 940
 941                 if(typeof formId == 'string'){
 942                         // Determine if the argument is a form id or a form name.
 943                         // Note form name usage is deprecated by supported
 944                         // here for legacy reasons.
 945                         oForm = (document.getElementById(formId) || document.forms[formId]);
 946                 }
 947                 else if(typeof formId == 'object'){
 948                         // Treat argument as an HTML form object.
 949                         oForm = formId;
 950                 }
 951                 else{
 952                         YAHOO.log('Unable to create form object ' + formId, 'warn', 'Connection');
 953                         return;
 954                 }
 955
 956                 // If the isUpload argument is true, setForm will call createFrame to initialize
 957                 // an iframe as the form target.
 958                 //
 959                 // The argument secureURI is also required by IE in SSL environments
 960                 // where the secureURI string is a fully qualified HTTP path, used to set the source
 961                 // of the iframe, to a stub resource in the same domain.
 962                 if(isUpload){
 963
 964                         // Create iframe in preparation for file upload.
 965                         this.createFrame(secureUri?secureUri:null);
 966
 967                         // Set form reference and file upload properties to true.
 968                         this._isFormSubmit = true;
 969                         this._isFileUpload = true;
 970                         this._formNode = oForm;
 971
 972                         return;
 973
 974                 }
 975
 976                 // Iterate over the form elements collection to construct the
 977                 // label-value pairs.
 978                 for (i=0,len=oForm.elements.length; i<len; ++i){
 979                         oElement  = oForm.elements[i];
 980                         oDisabled = oElement.disabled;
 981             oName     = oElement.name;
 982
 983                         // Do not submit fields that are disabled or
 984                         // do not have a name attribute value.
 985                         if(!oDisabled && oName)
 986                         {
 987                 oName  = encodeURIComponent(oName)+'=';
 988                 oValue = encodeURIComponent(oElement.value);
 989
 990                                 switch(oElement.type)
 991                                 {
 992                     // Safari, Opera, FF all default opt.value from .text if
 993                     // value attribute not specified in markup
 994                                         case 'select-one':
 995                         if (oElement.selectedIndex > -1) {
 996                             opt = oElement.options[oElement.selectedIndex];
 997                             data[item++] = oName + encodeURIComponent(
 998                                 (opt.attributes.value && opt.attributes.value.specified) ? opt.value : opt.text);
 999                         }
1000                         break;
1001                                         case 'select-multiple':
1002                         if (oElement.selectedIndex > -1) {
1003                             for(j=oElement.selectedIndex, jlen=oElement.options.length; j<jlen; ++j){
1004                                 opt = oElement.options[j];
1005                                 if (opt.selected) {
1006                                     data[item++] = oName + encodeURIComponent(
1007                                         (opt.attributes.value && opt.attributes.value.specified) ? opt.value : opt.text);
1008                                 }
1009                             }
1010                         }
1011                                                 break;
1012                                         case 'radio':
1013                                         case 'checkbox':
1014                                                 if(oElement.checked){
1015                             data[item++] = oName + oValue;
1016                                                 }
1017                                                 break;
1018                                         case 'file':
1019                                                 // stub case as XMLHttpRequest will only send the file path as a string.
1020                                         case undefined:
1021                                                 // stub case for fieldset element which returns undefined.
1022                                         case 'reset':
1023                                                 // stub case for input type reset button.
1024                                         case 'button':
1025                                                 // stub case for input type button elements.
1026                                                 break;
1027                                         case 'submit':
1028                                                 if(hasSubmit === false){
1029                                                         if(this._hasSubmitListener && this._submitElementValue){
1030                                 data[item++] = this._submitElementValue;
1031                                                         }
1032                                                         hasSubmit = true;
1033                                                 }
1034                                                 break;
1035                                         default:
1036                         data[item++] = oName + oValue;
1037                                 }
1038                         }
1039                 }
1040
1041                 this._isFormSubmit = true;
1042                 this._sFormData = data.join('&');
1043
1044                 YAHOO.log('Form initialized for transaction. HTML form POST message is: ' + this._sFormData, 'info', 'Connection');
1045
1046                 this.initHeader('Content-Type', this._default_form_header);
1047                 YAHOO.log('Initialize header Content-Type to application/x-www-form-urlencoded for setForm() transaction.', 'info', 'Connection');
1048
1049                 return this._sFormData;
1050         },
1051
1052   /**
1053    * @description Resets HTML form properties when an HTML form or HTML form
1054    * with file upload transaction is sent.
1055    * @method resetFormState
1056    * @private
1057    * @static
1058    * @return {void}
1059    */
1060         resetFormState:function(){
1061                 this._isFormSubmit = false;
1062                 this._isFileUpload = false;
1063                 this._formNode = null;
1064                 this._sFormData = "";
1065         },
1066
1067   /**
1068    * @description Creates an iframe to be used for form file uploads.  It is remove from the
1069    * document upon completion of the upload transaction.
1070    * @method createFrame
1071    * @private
1072    * @static
1073    * @param {string} optional qualified path of iframe resource for SSL in IE.
1074    * @return {void}
1075    */
1076         createFrame:function(secureUri){
1077
1078                 // IE does not allow the setting of id and name attributes as object
1079                 // properties via createElement().  A different iframe creation
1080                 // pattern is required for IE.
1081                 var frameId = 'yuiIO' + this._transaction_id;
1082                 var io;
1083                 if(YAHOO.env.ua.ie){
1084                         io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
1085
1086                         // IE will throw a security exception in an SSL environment if the
1087                         // iframe source is undefined.
1088                         if(typeof secureUri == 'boolean'){
1089                                 io.src = 'javascript:false';
1090                         }
1091                 }
1092                 else{
1093                         io = document.createElement('iframe');
1094                         io.id = frameId;
1095                         io.name = frameId;
1096                 }
1097
1098                 io.style.position = 'absolute';
1099                 io.style.top = '-1000px';
1100                 io.style.left = '-1000px';
1101
1102                 document.body.appendChild(io);
1103                 YAHOO.log('File upload iframe created. Id is:' + frameId, 'info', 'Connection');
1104         },
1105
1106   /**
1107    * @description Parses the POST data and creates hidden form elements
1108    * for each key-value, and appends them to the HTML form object.
1109    * @method appendPostData
1110    * @private
1111    * @static
1112    * @param {string} postData The HTTP POST data
1113    * @return {array} formElements Collection of hidden fields.
1114    */
1115         appendPostData:function(postData)
1116         {
1117                 var formElements = [],
1118                         postMessage = postData.split('&'),
1119                         i, delimitPos;
1120                 for(i=0; i < postMessage.length; i++){
1121                         delimitPos = postMessage[i].indexOf('=');
1122                         if(delimitPos != -1){
1123                                 formElements[i] = document.createElement('input');
1124                                 formElements[i].type = 'hidden';
1125                                 formElements[i].name = decodeURIComponent(postMessage[i].substring(0,delimitPos));
1126                                 formElements[i].value = decodeURIComponent(postMessage[i].substring(delimitPos+1));
1127                                 this._formNode.appendChild(formElements[i]);
1128                         }
1129                 }
1130
1131                 return formElements;
1132         },
1133
1134   /**
1135    * @description Uploads HTML form, inclusive of files/attachments, using the
1136    * iframe created in createFrame to facilitate the transaction.
1137    * @method uploadFile
1138    * @private
1139    * @static
1140    * @param {int} id The transaction id.
1141    * @param {object} callback User-defined callback object.
1142    * @param {string} uri Fully qualified path of resource.
1143    * @param {string} postData POST data to be submitted in addition to HTML form.
1144    * @return {void}
1145    */
1146         uploadFile:function(o, callback, uri, postData){
1147
1148                 // Each iframe has an id prefix of "yuiIO" followed
1149                 // by the unique transaction id.
1150                 var frameId = 'yuiIO' + o.tId,
1151                     uploadEncoding = 'multipart/form-data',
1152                     io = document.getElementById(frameId),
1153                     oConn = this,
1154                         args = (callback && callback.argument)?callback.argument:null,
1155             oElements,i,prop,obj;
1156
1157                 // Track original HTML form attribute values.
1158                 var rawFormAttributes =
1159                 {
1160                         action:this._formNode.getAttribute('action'),
1161                         method:this._formNode.getAttribute('method'),
1162                         target:this._formNode.getAttribute('target')
1163                 };
1164
1165                 // Initialize the HTML form properties in case they are
1166                 // not defined in the HTML form.
1167                 this._formNode.setAttribute('action', uri);
1168                 this._formNode.setAttribute('method', 'POST');
1169                 this._formNode.setAttribute('target', frameId);
1170
1171                 if(YAHOO.env.ua.ie){
1172                         // IE does not respect property enctype for HTML forms.
1173                         // Instead it uses the property - "encoding".
1174                         this._formNode.setAttribute('encoding', uploadEncoding);
1175                 }
1176                 else{
1177                         this._formNode.setAttribute('enctype', uploadEncoding);
1178                 }
1179
1180                 if(postData){
1181                         oElements = this.appendPostData(postData);
1182                 }
1183
1184                 // Start file upload.
1185                 this._formNode.submit();
1186
1187                 // Fire global custom event -- startEvent
1188                 this.startEvent.fire(o, args);
1189
1190                 if(o.startEvent){
1191                         // Fire transaction custom event -- startEvent
1192                         o.startEvent.fire(o, args);
1193                 }
1194
1195                 // Start polling if a callback is present and the timeout
1196                 // property has been defined.
1197                 if(callback && callback.timeout){
1198                         this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
1199                 }
1200
1201                 // Remove HTML elements created by appendPostData
1202                 if(oElements && oElements.length > 0){
1203                         for(i=0; i < oElements.length; i++){
1204                                 this._formNode.removeChild(oElements[i]);
1205                         }
1206                 }
1207
1208                 // Restore HTML form attributes to their original
1209                 // values prior to file upload.
1210                 for(prop in rawFormAttributes){
1211                         if(YAHOO.lang.hasOwnProperty(rawFormAttributes, prop)){
1212                                 if(rawFormAttributes[prop]){
1213                                         this._formNode.setAttribute(prop, rawFormAttributes[prop]);
1214                                 }
1215                                 else{
1216                                         this._formNode.removeAttribute(prop);
1217                                 }
1218                         }
1219                 }
1220
1221                 // Reset HTML form state properties.
1222                 this.resetFormState();
1223
1224                 // Create the upload callback handler that fires when the iframe
1225                 // receives the load event.  Subsequently, the event handler is detached
1226                 // and the iframe removed from the document.
1227                 var uploadCallback = function()
1228                 {
1229                         if(callback && callback.timeout){
1230                                 window.clearTimeout(oConn._timeOut[o.tId]);
1231                                 delete oConn._timeOut[o.tId];
1232                         }
1233
1234                         // Fire global custom event -- completeEvent
1235                         oConn.completeEvent.fire(o, args);
1236
1237                         if(o.completeEvent){
1238                                 // Fire transaction custom event -- completeEvent
1239                                 o.completeEvent.fire(o, args);
1240                         }
1241
1242                         obj = {
1243                             tId : o.tId,
1244                             argument : callback.argument
1245             };
1246
1247                         try
1248                         {
1249                                 // responseText and responseXML will be populated with the same data from the iframe.
1250                                 // Since the HTTP headers cannot be read from the iframe
1251                                 obj.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:io.contentWindow.document.documentElement.textContent;
1252                                 obj.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
1253                         }
1254                         catch(e){}
1255
1256                         if(callback && callback.upload){
1257                                 if(!callback.scope){
1258                                         callback.upload(obj);
1259                                         YAHOO.log('Upload callback.', 'info', 'Connection');
1260                                 }
1261                                 else{
1262                                         callback.upload.apply(callback.scope, [obj]);
1263                                         YAHOO.log('Upload callback with scope.', 'info', 'Connection');
1264                                 }
1265                         }
1266
1267                         // Fire global custom event -- uploadEvent
1268                         oConn.uploadEvent.fire(obj);
1269
1270                         if(o.uploadEvent){
1271                                 // Fire transaction custom event -- uploadEvent
1272                                 o.uploadEvent.fire(obj);
1273                         }
1274
1275                         YAHOO.util.Event.removeListener(io, "load", uploadCallback);
1276
1277                         setTimeout(
1278                                 function(){
1279                                         document.body.removeChild(io);
1280                                         oConn.releaseObject(o);
1281                                         YAHOO.log('File upload iframe destroyed. Id is:' + frameId, 'info', 'Connection');
1282                                 }, 100);
1283                 };
1284
1285                 // Bind the onload handler to the iframe to detect the file upload response.
1286                 YAHOO.util.Event.addListener(io, "load", uploadCallback);
1287         },
1288
1289   /**
1290    * @description Method to terminate a transaction, if it has not reached readyState 4.
1291    * @method abort
1292    * @public
1293    * @static
1294    * @param {object} o The connection object returned by asyncRequest.
1295    * @param {object} callback  User-defined callback object.
1296    * @param {string} isTimeout boolean to indicate if abort resulted from a callback timeout.
1297    * @return {boolean}
1298    */
1299         abort:function(o, callback, isTimeout)
1300         {
1301                 var abortStatus;
1302                 var args = (callback && callback.argument)?callback.argument:null;
1303
1304
1305                 if(o && o.conn){
1306                         if(this.isCallInProgress(o)){
1307                                 // Issue abort request
1308                                 o.conn.abort();
1309
1310                                 window.clearInterval(this._poll[o.tId]);
1311                                 delete this._poll[o.tId];
1312
1313                                 if(isTimeout){
1314                                         window.clearTimeout(this._timeOut[o.tId]);
1315                                         delete this._timeOut[o.tId];
1316                                 }
1317
1318                                 abortStatus = true;
1319                         }
1320                 }
1321                 else if(o && o.isUpload === true){
1322                         var frameId = 'yuiIO' + o.tId;
1323                         var io = document.getElementById(frameId);
1324
1325                         if(io){
1326                                 // Remove all listeners on the iframe prior to
1327                                 // its destruction.
1328                                 YAHOO.util.Event.removeListener(io, "load");
1329                                 // Destroy the iframe facilitating the transaction.
1330                                 document.body.removeChild(io);
1331                                 YAHOO.log('File upload iframe destroyed. Id is:' + frameId, 'info', 'Connection');
1332
1333                                 if(isTimeout){
1334                                         window.clearTimeout(this._timeOut[o.tId]);
1335                                         delete this._timeOut[o.tId];
1336                                 }
1337
1338                                 abortStatus = true;
1339                         }
1340                 }
1341                 else{
1342                         abortStatus = false;
1343                 }
1344
1345                 if(abortStatus === true){
1346                         // Fire global custom event -- abortEvent
1347                         this.abortEvent.fire(o, args);
1348
1349                         if(o.abortEvent){
1350                                 // Fire transaction custom event -- abortEvent
1351                                 o.abortEvent.fire(o, args);
1352                         }
1353
1354                         this.handleTransactionResponse(o, callback, true);
1355                         YAHOO.log('Transaction ' + o.tId + ' aborted.', 'info', 'Connection');
1356                 }
1357
1358                 return abortStatus;
1359         },
1360
1361   /**
1362    * @description Determines if the transaction is still being processed.
1363    * @method isCallInProgress
1364    * @public
1365    * @static
1366    * @param {object} o The connection object returned by asyncRequest
1367    * @return {boolean}
1368    */
1369         isCallInProgress:function(o)
1370         {
1371                 // if the XHR object assigned to the transaction has not been dereferenced,
1372                 // then check its readyState status.  Otherwise, return false.
1373                 if(o && o.conn){
1374                         return o.conn.readyState !== 4 && o.conn.readyState !== 0;
1375                 }
1376                 else if(o && o.isUpload === true){
1377                         var frameId = 'yuiIO' + o.tId;
1378                         return document.getElementById(frameId)?true:false;
1379                 }
1380                 else{
1381                         return false;
1382                 }
1383         },
1384
1385   /**
1386    * @description Dereference the XHR instance and the connection object after the transaction is completed.
1387    * @method releaseObject
1388    * @private
1389    * @static
1390    * @param {object} o The connection object
1391    * @return {void}
1392    */
1393         releaseObject:function(o)
1394         {
1395                 if(o && o.conn){
1396                         //dereference the XHR instance.
1397                         o.conn = null;
1398
1399                         YAHOO.log('Connection object for transaction ' + o.tId + ' destroyed.', 'info', 'Connection');
1400
1401                         //dereference the connection object.
1402                         o = null;
1403                 }
1404         }
1405 };
1406 YAHOO.register("connection", YAHOO.util.Connect, {version: "2.7.0", build: "1799"});