//=============================================================================
var Ajax = {};
//=============================================================================
//Enumeration
Ajax.RequestMethod = {Get : "GET", Post : "POST"};
//=============================================================================
//Handles page requests in a collection
Ajax.PageRequests = function()
{ 
    return {
         Requests : null, 
         //-------------------------------------------------------------------- 
         //----------                Gets the type of object          ---------
         //--------------------------------------------------------------------
         GetType : function()
         { 
              return "Ajax.PageRequests"; 
         },
         //--------------------------------------------------------------------
         //----------                     Initializer                 ---------
         //--------------------------------------------------------------------
         Init : function()
         {
              this.Requests = new Array();
              if(arguments[0].length == 1)
              { 
                   this.Requests.push(arguments[0][0]); 
              }
              return this; 
         },
         //--------------------------------------------------------------------
         //-----               Adds Requests to the collection           ------
         //--------------------------------------------------------------------
         AddRequest : function()
         {
              if(arguments.length == 0 || arguments[0].GetType() != "Ajax.Request")
              { 
                   return; 
              }
              this.Requests.push(arguments[0]);            
         }    
    }.Init(arguments);
}
//=============================================================================
//Single Page Request
Ajax.Request = function()
{ 
    return {
         Method     : null,
         URL        : null,
         Params     : null,
         Callback   : null,
         Async      : false,
         UserObject : null,    
         //--------------------------------------------------------------------
         //---------              Gets the type of object            ----------
         //--------------------------------------------------------------------
         GetType : function()
         { 
              return "Ajax.Request"; 
         },
         //--------------------------------------------------------------------
         //---------                   Initializer                   ----------
         //--------------------------------------------------------------------
         Init : function()
         {
              switch(arguments[0].length)
              {
                   case 1 : 
                        this.Method = arguments[0][0]; 
                        break;
                   case 2 : 
                        this.Method = arguments[0][0]; 
                        this.URL    = arguments[0][1]; 
                        break;
                   case 3 : 
                        this.Method   = arguments[0][0]; 
                        this.URL      = arguments[0][1]; 
                        this.Callback = arguments[0][2]; 
                        break;
                   case 4 : 
                        this.Method   = arguments[0][0]; 
                        this.URL      = arguments[0][1]; 
                        this.Callback = arguments[0][2]; 
                        this.Async    = arguments[0][3]; 
                        break;
                   case 5 : 
                        this.Method     = arguments[0][0]; 
                        this.URL        = arguments[0][1]; 
                        this.Callback   = arguments[0][2]; 
                        this.Async      = arguments[0][3]; 
                        this.UserObject = arguments[0][4]; 
                        break;
              }
              this.Params = new Array();
              return this; 
         },
         //--------------------------------------------------------------------
         //----       Adds Parameters to the parameter array collection   -----
         //--------------------------------------------------------------------
         AddParam : function()
         {
              switch(arguments.length)
              {
                   case 1 : 
                        this.Params.push(arguments[0]); 
                        break;
                   case 2 : 
                        this.Params.push(new Ajax.Parameter(arguments[0], arguments[1])); 
                        break;
              }
         }   
    }.Init(arguments);
}
//=============================================================================
//Page Request Parameter Object
Ajax.Parameter = function()
{ 
    return {
         Name  : null,
         Value : null,
         //--------------------------------------------------------------------
         //----------               Gets the type of object           ---------
         //--------------------------------------------------------------------
         GetType : function()
         { 
              return "Ajax.Parameter"; 
         },
         //--------------------------------------------------------------------
         //----------                    Initializer                  ---------
         //--------------------------------------------------------------------
         Init : function()
         { 
              if(arguments[0].length == 2)
              { 
                   this.Name  = arguments[0][0]; 
                   this.Value = arguments[0][1]; 
              }
              return this; 
         }         
    }.Init(arguments);
}
//=============================================================================
Ajax.ActiveObject = 0; //For knowing what type of active X object.
//For handling ajax connections
Ajax.Connection = function()
{ 
    return {
         ActiveXObject : null,
         PageRequests  : null,
         Current       : null,
         //--------------------------------------------------------------------
         //--------               Gets the type of object           -----------
         //--------------------------------------------------------------------
         GetType : function()
         { 
              return "Ajax.Connection"; 
         },
         //--------------------------------------------------------------------
         //---------------              Initializer            ----------------
         //--------------------------------------------------------------------
         Init : function()
         { 
              if(arguments[0].length == 1)
              { 
                   this.PageRequests = arguments[0][0]; 
              }
              return this; 
         },
         //--------------------------------------------------------------------
         //---               Creates the active x object for use           ----
         //--------------------------------------------------------------------
         Create : function()
         {
              switch(Ajax.ActiveObject)
              {
                   case 0:
                        if(window.ActiveXObject)
                        {
                             try 
                             { 
                                  Ajax.ActiveObject = 2;
                                  return new ActiveXObject("Msxml2.XMLHTTP");        
                             } 
                             catch(e) 
                             {  
                                  Ajax.ActiveObject = 3;
                                  return new ActiveXObject("Microsoft.XMLHTTP");
                             }
                        }
                        else
                        {
                             if(window.XMLHttpRequest)
                             {
                                  Ajax.ActiveObject = 1;
                                  return new XMLHttpRequest();
                             }
                        }            
                   case 1: 
                        return new XMLHttpRequest();           
                   case 2: 
                        return new ActiveXObject("Msxml2.XMLHTTP");           
                   case 3: 
                        return new ActiveXObject("Microsoft.XMLHTTP");
                   default: 
                        break;
              }
              //---------------------------------------------------------------
              //-----------           No Ajax Object Found          -----------
              //---------------------------------------------------------------
              Ajax.ActiveObject = -1;
              throw "Missing a required ajax object.";
              return false;              
         },    
         Open : function()
         {
              //---------------------------------------------------------------
              //-------        Check if page requests has something      ------
              //---------------------------------------------------------------
              if(this.PageRequests == null)
              { 
                   return; 
              }
              //---------------------------------------------------------------
              //-------------           Create Variables          -------------
              //---------------------------------------------------------------
              var obj  = this;
              var Data = "";
              //---------------------------------------------------------------
              //--------------           Create ActiveX          --------------
              //---------------------------------------------------------------
              this.ActiveXObject = this.Create();
              //---------------------------------------------------------------
              //----------------           Get Request          ---------------
              //---------------------------------------------------------------
              this.Current = this.PageRequests.Requests.shift();
              //---------------------------------------------------------------
              //--------------Open Connection-------------
              //---------------------------------------------------------------
              this.ActiveXObject.open(this.Current.Method, this.Current.URL, this.Current.Async);
              //---------------------------------------------------------------
              //-----------          Create ActiveX Callback           --------
              //---------------------------------------------------------------
              this.ActiveXObject.onreadystatechange = function() 
              {
                   obj.OnReadyStateChange();
              }
              //---------------------------------------------------------------
              //--------------         Open Ajax Request            -----------
              //---------------------------------------------------------------
              if(this.Current.Method == "POST")
              {
                   this.ActiveXObject.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
               
                   if(this.Current.Params != null && this.Current.Params.length != 0)
                   {
                        for(var Param in this.Current.Params) 
                        {
                             Data += (Data == "") ? this.Current.Params[Param].Name + "=" + this.Current.Params[Param].Value : "&" + this.Current.Params[Param].Name + "=" + this.Current.Params[Param].Value;
                        }
                   }
                   this.ActiveXObject.send(encodeURI(Data));
              }
              else
              {
                   this.ActiveXObject.send(null);
              }              
         },
         //--------------------------------------------------------------------
         //-----------               ActiveXObject callback           ---------
         //--------------------------------------------------------------------
         OnReadyStateChange : function()
         {
              //---------------------------------------------------------------
              //-------            Get Ajax objects for return         --------
              //---------------------------------------------------------------
              var r = {};
              r.ReadyState   = this.ActiveXObject.readyState;
              r.ResponseText = (this.ActiveXObject.readyState == 4) ? this.ActiveXObject.responseText : null;
              r.Status       = (this.ActiveXObject.readyState == 4) ? this.ActiveXObject.status : null;
              r.URL          = this.Current.URL;
              r.UserObject   = this.Current.UserObject;
              r.Complete     = (this.ActiveXObject.readyState == 4 && this.PageRequests.Requests.length == 0) ? true : false;
              //---------------------------------------------------------------        
              //-----------            Call Callback Method         -----------
              //---------------------------------------------------------------
              if(this.Current.Callback != null)
              {
                   this.Current.Callback(r);
              }
              //---------------------------------------------------------------
              //-------------           Loop For Many URLS          -----------
              //---------------------------------------------------------------
              if(this.ActiveXObject.readyState == 4)
              { 
                   if(r.Complete)
                   { 
                        this.PageRequests = null; 
                        this.ActiveXObject.abort(); 
                        this.Current = null; 
                   }
                   else
                   { 
                        this.Open();
                   }
              }
         }      
    }.Init(arguments);
}
//=============================================================================