/* Simple AJAX Code-Kit (SACK) */
/* ©2005 Gregory Wild-Smith */
/* www.twilightuniverse.com */
/* Software licenced under a modified X11 licence, see documentation or authors website for more details */

function sack(file)
{
	this.AjaxFailedAlert	= "Your browser does not support the enhanced functionality of this website, and therefore you will have an experience that differs from the intended one.\n";
	this.requestFile		= file;
	this.method				= "POST";
	this.URLString			= "";
	this.encodeURIString	= true;
	this.execute			= false;

	// ----------------------------------------------------
	// Définition des fonctions nécessaire a Ajax
	// ----------------------------------------------------
	this.onLoading		= function() { };
	this.onLoaded		= function() { };
	this.onInteractive	= function() { };
	this.onCompletion	= function() { };

	/*
		Cette fonction créer l'instance Ajax pour la
		mise a jour asynchrone
	*/
	this.createAJAX = function()
	{
//alert("Create AJAX");
		try
		{
			this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e)
		{
			try
			{
				this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (err)
			{
				this.xmlhttp = null;
			}
		}

		if(!this.xmlhttp && typeof XMLHttpRequest != "undefined")
			this.xmlhttp = new XMLHttpRequest();

		if (!this.xmlhttp)
			this.failed = true;
		else
			this.failed = false;
	};
	
	this.setVar = function(name, value)
	{
		if (this.URLString.length < 3){
			this.URLString = name + "=" + value;
		} else {
			this.URLString += "&" + name + "=" + value;
		}
	}
	
	this.encVar = function(name, value)
	{
		var varString = encodeURIComponent(name) + "=" + encodeURIComponent(value);
		return varString;
	}
	
	this.encodeURLString = function(string)
	{
		varArray = string.split('&');
		for (i = 0; i < varArray.length; i++)
		{
			urlVars = varArray[i].split('=');
			if (urlVars[0].indexOf('amp;') != -1)
			{
				urlVars[0] = urlVars[0].substring(4);
			}
			varArray[i] = this.encVar(urlVars[0],urlVars[1]);
		}
		return varArray.join('&');
	}
	
	this.runResponse = function()
	{
		eval(this.response);
	}
	
	/*
		Cette fonction execute gestion asynchrone
	*/
	this.runAJAX = function(urlstring)
	{
		this.responseStatus = new Array(2);
		
		// Si incapable d'instancier l'object asynchrone, affiche
		// erreur de Browser incompatible
		if (this.failed && this.AjaxFailedAlert)
		{ 
			alert(this.AjaxFailedAlert);
		}
		else
		{
			if (urlstring)
			{
				if (this.URLString.length){
					this.URLString = this.URLString + "&" + urlstring; 
				} else {
					this.URLString = urlstring; 
				}
			}
			if (this.encodeURIString)
			{
				var timeval = new Date().getTime(); 
				this.URLString = this.encodeURLString(this.URLString);
				this.setVar("rndval", timeval);
			}
			if (this.element) { this.elementObj = document.getElementById(this.element); }
			if (this.xmlhttp)
			{
				var self = this;
				if (this.method == "GET")
				{
					var totalurlstring = this.requestFile + "?" + this.URLString;
					this.xmlhttp.open(this.method, totalurlstring, true);
				} else {
					this.xmlhttp.open(this.method, this.requestFile, true);
				}

				if (this.method == "POST")
				{
  					try
  					{
						this.xmlhttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded')  
					}
					catch (e) {}
				}

				this.xmlhttp.send(this.URLString);
				this.xmlhttp.onreadystatechange = function()
				{
					switch (self.xmlhttp.readyState)
					{
						case 1:
							self.onLoading();
							break;
						case 2:
							self.onLoaded();
							break;
						case 3:
							self.onInteractive();
							break;
						case 4:
							self.response			= self.xmlhttp.responseText;
							self.responseXML		= self.xmlhttp.responseXML;
							self.responseStatus[0]	= self.xmlhttp.status;
							self.responseStatus[1]	= self.xmlhttp.statusText;
							self.onCompletion();

							if(self.execute){ self.runResponse(); }
							if (self.elementObj)
							{
								var elemNodeName = self.elementObj.nodeName;
								elemNodeName.toLowerCase();
								if (elemNodeName == "input" || elemNodeName == "select" || elemNodeName == "option" || elemNodeName == "textarea"){
									self.elementObj.value = self.response;
								} else {
									self.elementObj.innerHTML = self.response;
								}
							}
							self.URLString = "";
							break;
					}
				};
			}
		}
	};

	// Créer l'instance Ajax
	this.createAJAX();
}