// ===================================================================
// Author : Matt Kruse < matt@ajaxtoolbox.com >
// WWW : http : // www.AjaxToolbox.com /
//
// NOTICE : You may use this code for any purpose, commercial or
// private, without any further permission from the author. You may
// remove this notice from your final code if you wish, however it is
// appreciated by the author if at least my web site address is kept.
//
// You may * NOT * re - distribute this code in any way except through its
// use. That means, you can include it in your product, or your web
// site, or any other form where the code is actually being used. You
// may not put the plain javascript up on your site for download or
// include it in your javascript libraries for download.
// If you wish to share this code with others, please just point them
// to the URL instead.
// Please DO NOT link directly to my .js files from your site. Copy
// the files to your server and use them there. Thank you.
// ===================================================================
function AjaxRequest()
{
   var req = new Object();
   req.timeout = null;
   req.generateUniqueUrl = true;
   req.url = window.location.href;
   req.method = "GET";
   req.async = true;
   req.username = null;
   req.password = null;
   req.parameters = new Object();
   req.requestIndex = AjaxRequest.numAjaxRequests ++ ;
   req.responseReceived = false;
   req.groupName = null;
   req.queryString = "";
   req.responseText = null;
   req.responseXML = null;
   req.status = null;
   req.statusText = null;
   req.aborted = false;
   req.xmlHttpRequest = null;
   req.onTimeout = null;
   req.onLoading = null;
   req.onLoaded = null;
   req.onInteractive = null;
   req.onComplete = null;
   req.onSuccess = null;
   req.onError = null;
   req.onGroupBegin = null;
   req.onGroupEnd = null;
   req.xmlHttpRequest = AjaxRequest.getXmlHttpRequest();
   
   if(req.xmlHttpRequest == null)
   {
      return null;
   }
   req.xmlHttpRequest.onreadystatechange = function()
   {
      if(req == null || req.xmlHttpRequest == null)
      {
         return;
      }
      
      if(req.xmlHttpRequest.readyState == 1)
      {
         req.onLoadingInternal(req);
      }
      if(req.xmlHttpRequest.readyState == 2)
      {
         req.onLoadedInternal(req);
      }
      if(req.xmlHttpRequest.readyState == 3)
      {
         req.onInteractiveInternal(req);
      }
      if(req.xmlHttpRequest.readyState == 4)
      {
         req.onCompleteInternal(req);
      }
   }
   ;
   req.onLoadingInternalHandled = false;
   req.onLoadedInternalHandled = false;
   req.onInteractiveInternalHandled = false;
   req.onCompleteInternalHandled = false;
   req.onLoadingInternal = function()
   {
      if(req.onLoadingInternalHandled)
      {
         return;
      }
      AjaxRequest.numActiveAjaxRequests ++ ;
      if(AjaxRequest.numActiveAjaxRequests == 1 && typeof(window['AjaxRequestBegin']) == "function")
      {
         AjaxRequestBegin();
      }
      if(req.groupName != null)
      {
         if(typeof(AjaxRequest.numActiveAjaxGroupRequests[req.groupName]) == "undefined")
         {
            AjaxRequest.numActiveAjaxGroupRequests[req.groupName] = 0;
         }
         AjaxRequest.numActiveAjaxGroupRequests[req.groupName] ++ ;
         if(AjaxRequest.numActiveAjaxGroupRequests[req.groupName] == 1 && typeof(req.onGroupBegin) == "function")
         {
            req.onGroupBegin(req.groupName);
         }
      }
      if(typeof(req.onLoading) == "function")
      {
         req.onLoading(req);
      }
      req.onLoadingInternalHandled = true;
   }
   ;
   req.onLoadedInternal = function()
   {
      if(req.onLoadedInternalHandled)
      {
         return;
      }
      if(typeof(req.onLoaded) == "function")
      {
         req.onLoaded(req);
      }
      req.onLoadedInternalHandled = true;
   }
   ;
   req.onInteractiveInternal =
   function()
   {
      if(req.onInteractiveInternalHandled)
      {
         return;
      }
      if(typeof(req.onInteractive) == "function")
      {
         req.onInteractive(req);
      }
      req.onInteractiveInternalHandled = true;
   }
   ;
   req.onCompleteInternal = function()
   {
   
      if(req.onCompleteInternalHandled || req.aborted)
      {
         return;
      }
      req.onCompleteInternalHandled = true;
      AjaxRequest.numActiveAjaxRequests -- ;
      if(AjaxRequest.numActiveAjaxRequests == 0 && typeof(window['AjaxRequestEnd']) == "function")
      {
         AjaxRequestEnd(req.groupName);
      }
      if(req.groupName != null)
      {
         AjaxRequest.numActiveAjaxGroupRequests[req.groupName] -- ;
         if(AjaxRequest.numActiveAjaxGroupRequests[req.groupName] == 0 && typeof(req.onGroupEnd) == "function")
         {
            req.onGroupEnd(req.groupName);
         }
      }
      req.responseReceived = true;
      req.status = req.xmlHttpRequest.status;
      req.statusText = req.xmlHttpRequest.statusText;
      req.responseText = req.xmlHttpRequest.responseText;
      req.responseXML = req.xmlHttpRequest.responseXML;
      if(typeof(req.onComplete) == "function")
      {
         req.onComplete(req);
      }
      if(req.xmlHttpRequest.status == 200 && typeof(req.onSuccess) == "function")
      {
         req.onSuccess(req);
      }
      else if(typeof(req.onError) == "function")
      {
         req.onError(req);
      }
      delete req.xmlHttpRequest['onreadystatechange'];
      req.xmlHttpRequest = null;
   }
   ;
   req.onTimeoutInternal = function()
   {
      if(req != null && req.xmlHttpRequest != null && ! req.onCompleteInternalHandled)
      {
         req.aborted = true;
         req.xmlHttpRequest.abort();
         AjaxRequest.numActiveAjaxRequests -- ;
         
         if(AjaxRequest.numActiveAjaxRequests == 0 && typeof(window['AjaxRequestEnd']) == "function")
         {
            AjaxRequestEnd(req.groupName);
            
         }
         if(req.groupName != null)
         {
            AjaxRequest.numActiveAjaxGroupRequests[req.groupName] -- ;
            if(AjaxRequest.numActiveAjaxGroupRequests[req.groupName] == 0 && typeof(req.onGroupEnd) == "function")
            {
               req.onGroupEnd(req.groupName);
            }
         }
         if(typeof(req.onTimeout) == "function")
         {
            req.onTimeout(req);
         }
         delete req.xmlHttpRequest['onreadystatechange'];
         req.xmlHttpRequest = null;
      }
   }
   ;
   req.process = function()
   {
      if(req.xmlHttpRequest != null)
      {
         if(req.generateUniqueUrl && req.method == "GET")
         {
            req.parameters["AjaxRequestUniqueId"] = new Date().getTime() + "" + req.requestIndex;
         }
         var content = null;
         for(var i in req.parameters)
         {
            if(req.queryString.length > 0)
            {
               req.queryString += "&";
            }
            req.queryString += encodeURIComponent(i) + "=" + encodeURIComponent(req.parameters[i]);
         }
         if(req.method == "GET")
         {
            if(req.queryString.length > 0)
            {
               req.url += ((req.url.indexOf("?") > - 1) ? "&" : "?") + req.queryString;
            }
         }
         req.xmlHttpRequest.open(req.method, req.url, req.async, req.username, req.password);
         if(req.method == "POST")
         {
            if(typeof(req.xmlHttpRequest.setRequestHeader) != "undefined")
            {
               req.xmlHttpRequest.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
            }
            content = req.queryString;
         }
         if(req.timeout > 0)
         {
            setTimeout(req.onTimeoutInternal, req.timeout);
         }
         req.xmlHttpRequest.send(content);
      }
   }
   ;
   req.handleArguments = function(args)
   {
      for(var i in args)
      {
         if(typeof(req[i]) == "undefined")
         {
            req.parameters[i] = args[i];
         }
         else
         {
            req[i] = args[i];
         }
      }
   }
   ;
   req.getAllResponseHeaders =
   function()
   {
      if(req.xmlHttpRequest != null)
      {
         if(req.responseReceived)
         {
            return req.xmlHttpRequest.getAllResponseHeaders();
         }
         alert("Cannot getAllResponseHeaders because a response has not yet been received");
      }
   }
   ;
   req.getResponseHeader =
   function(headerName)
   {
      if(req.xmlHttpRequest != null)
      {
         if(req.responseReceived)
         {
            return req.xmlHttpRequest.getResponseHeader(headerName);
         }
         alert("Cannot getResponseHeader because a response has not yet been received");
      }
   }
   ;
   return req;
}
AjaxRequest.getXmlHttpRequest = function()
{
   if(window.XMLHttpRequest)
   {
      return new XMLHttpRequest();
   }
   else if(window.ActiveXObject)
   {
      /* @cc_on @ */
      /* @if(@_jscript_version >= 5)
      try{return new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){try{return new ActiveXObject("Microsoft.XMLHTTP"); }catch(E){return null; }}@end @ */
   }
   else
   {
      return null;
   }
}
;
AjaxRequest.isActive = function()
{
   return(AjaxRequest.numActiveAjaxRequests > 0);
}
;
AjaxRequest.get = function(args)
{
   AjaxRequest.doRequest("GET", args);
}
;
AjaxRequest.post = function(args)
{
   AjaxRequest.doRequest("POST", args);
}
;
AjaxRequest.doRequest = function(method, args)
{
   if(typeof(args) != "undefined" && args != null)
   {
      var myRequest = new AjaxRequest();
      myRequest.method = method;
      myRequest.handleArguments(args);
      myRequest.process();
   }
}
;
AjaxRequest.submit = function(theform, args)
{
   var myRequest = new AjaxRequest();
   if(myRequest == null)
   {
      return false;
   }
   var serializedForm = AjaxRequest.serializeForm(theform);
   myRequest.method = theform.method.toUpperCase();
   myRequest.url = theform.action;
   myRequest.handleArguments(args);
   myRequest.queryString = serializedForm;
   myRequest.process();
   return true;
}
;
AjaxRequest.serializeForm = function(theform)
{
   var els = theform.elements;
   var len = els.length;
   var queryString = "";
   this.addField =
   function(name, value)
   {
      if(queryString.length > 0)
      {
         queryString += "&";
      }
      queryString += encodeURIComponent(name) + "=" + encodeURIComponent(value);
   }
   ;
   for(var i = 0; i < len; i ++ )
   {
      var el = els[i];
      if( ! el.disabled)
      {
         switch(el.type)
         {
            case 'text' :
            case 'password' :
            case 'hidden' :
            case 'textarea' :
               this.addField(el.name, el.value);
               break;
            case 'select-one' :
               if(el.selectedIndex >= 0)
               {
                  this.addField(el.name, el.options[el.selectedIndex].value);
               }
               break;
            case 'select-multiple' :
               for(var j = 0; j < el.options.length; j ++ )
               {
                  if(el.options[j].selected)
                  {
                     this.addField(el.name, el.options[j].value);
                  }
               }
               break;
            case 'checkbox' :
            case 'radio' :
               if(el.checked)
               {
                  this.addField(el.name, el.value);
               }
               break;
         }
      }
   }
   return queryString;
}
;
AjaxRequest.numActiveAjaxRequests = 0;
AjaxRequest.numActiveAjaxGroupRequests = new Object();
AjaxRequest.numAjaxRequests = 0;