/**
 * @author Francesco
 */
function AjaxModule() {}

AjaxModule.prototype.convertSettings = [];
AjaxModule.prototype.convertSettings[0] = [];
AjaxModule.prototype.convertSettings[0]["convert"] = {pattern:/&/g, stringa:"[EC]"};
AjaxModule.prototype.convertSettings[0]["restore"] = {pattern:/\[EC\]/g, stringa:"&"};
AjaxModule.prototype.convertSettings[1] = [];
AjaxModule.prototype.convertSettings[1]["convert"] = {pattern:/:/g, stringa:"[DP]"};
AjaxModule.prototype.convertSettings[1]["restore"] = {pattern:/\[DP\]/g, stringa:":"};
AjaxModule.prototype.convertSettings[2] = [];
AjaxModule.prototype.convertSettings[2]["convert"] = {pattern:/\+/g, stringa:"[P]"};
AjaxModule.prototype.convertSettings[2]["restore"] = {pattern:/\[P\]/g, stringa:"+"};
AjaxModule.prototype.convertSettings[3] = [];
AjaxModule.prototype.convertSettings[3]["convert"] = {pattern:/\*/g, stringa:"[AS]"};
AjaxModule.prototype.convertSettings[3]["restore"] = {pattern:/\[AS\]/g, stringa:"*"};
AjaxModule.prototype.convertSettings[4] = [];
AjaxModule.prototype.convertSettings[4]["convert"] = {pattern:/%/g, stringa:"[MD]"};
AjaxModule.prototype.convertSettings[4]["restore"] = {pattern:/\[MD\]/g, stringa:"%"};

AjaxModule.prototype.convertString = function(str, key)
{
	if (key != "convert" && key != "restore")
		throw new Error("Chiave per la conversione stringa non valida!");

	var stringa = new String(str);
	for (var i = 0; i < AjaxModule.prototype.convertSettings.length; i++)
	{
		stringa = stringa.replace
		(
			AjaxModule.prototype.convertSettings[i][key].pattern,
			AjaxModule.prototype.convertSettings[i][key].stringa
		);
	}
	return stringa;
}

AjaxModule.prototype.createXMLHttpRequest = function()
{
	var xmlobj = false;

	try
	{ xmlobj = new ActiveXObject("Msxml2.XMLHTTP"); }
	catch (oldIE)
	{
		try
		{ xmlobj = new ActiveXObject("Microsoft.XMLHTTP"); }
		catch (notIE)
		{ xmlobj = false; }
	}

	if (!xmlobj && typeof XMLHttpRequest != undefined)
	{ xmlobj = new XMLHttpRequest(); }

	return xmlobj;
}

AjaxModule.prototype.loadingSrc = "immagini/loading.gif";
AjaxModule.prototype.loadingTarget = document.body;
AjaxModule.prototype.setLoadingTarget = function(target)
{
	var err = new String("Target non valido, impossibile gestire correttamente la risposta!");
	if (typeof(AjaxModule.prototype.loadingTarget) == "object")
	{
		try { AjaxModule.prototype.loadingTarget = target; }
		catch (e) { throw new Error(err); }
	}
	else throw new Error(err);
}

AjaxModule.prototype.loadingGIF = function()
{
	var contentHTML = '<img src="' + AjaxModule.prototype.loadingSrc + '" border="0" />';
	AjaxModule.prototype.loadingTarget.innerHTML = contentHTML;
}

AjaxModule.prototype.params = [];
AjaxModule.prototype.target = document.body;
AjaxModule.prototype.xmlhttp = AjaxModule.prototype.createXMLHttpRequest();

AjaxModule.prototype.clearParams = function()
{ AjaxModule.prototype.params = []; }

AjaxModule.prototype.setTarget = function(target)
{
	var err = new String("Target non valido, impossibile gestire correttamente la risposta!");
	if (typeof(AjaxModule.prototype.target) == "object" ||
		typeof(AjaxModule.prototype.target) == "function")
	{
		try { AjaxModule.prototype.target = target; }
		catch (e) { throw new Error(err); }
	}
	else throw new Error(err);
}

AjaxModule.prototype.sendRequest = function()
{
	var pars = new String();

	for (var i in AjaxModule.prototype.params)
		pars += i + "=" + AjaxModule.prototype.convertString(AjaxModule.prototype.params[i], "convert") + "&";

	AjaxModule.prototype.clearParams();
	pars = pars.substr(0, (pars.length - 1));
	AjaxModule.prototype.xmlhttp.send(pars);
}

AjaxModule.prototype.makeRequest = function(sPage)
{
	AjaxModule.prototype.xmlhttp.open("POST", sPage, true);
	AjaxModule.prototype.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
	AjaxModule.prototype.xmlhttp.onreadystatechange = AjaxModule.prototype.handleResponse;
	AjaxModule.prototype.sendRequest();
}

AjaxModule.prototype.handleResponse = function()
{
	if (AjaxModule.prototype.xmlhttp.readyState == 4)
	{
		if (AjaxModule.prototype.xmlhttp.status == 200)
		{
			var response = AjaxModule.prototype.convertString(AjaxModule.prototype.xmlhttp.responseText, "restore");

			if (typeof(AjaxModule.prototype.target) == "object")
				AjaxModule.prototype.target.innerHTML = response;
			else if (typeof(AjaxModule.prototype.target) == "function")
				AjaxModule.prototype.target(response);
			else throw new Error("Target non valido, impossibile gestire correttamente la risposta!");
		}
		else
		{
			var contentHTML = "<b>Errore durante il trasferimento dati.</b>";
			contentHTML += "<br />Stato : " + AjaxModule.prototype.xmlhttp.status;
			document.getElementById(AjaxModule.prototype.target).innerHTML = contentHTML;
		}
	}
}