// funzione per assegnare un oggetto XMLHttpRequest
var dynamicContent_ajaxObjects = new Array(); 
var jsCache = new Array();
var enableCache = false; 

function ajax_loadGallery(path){
		// faccenda riga evidenziata per scheda: asfalto le variabili ---------	
			id_riga_selezione_scheda = null;
			class_inizio_selezione_scheda = null;
			// --------------------------------------------------------------------
			divId = "lightbox_gallery";
			pathToFile = "./getDirContent.jsp?dir="+path;
		  if(enableCache && jsCache[pathToFile]){
		    document.getElementById(divId).innerHTML = jsCache[pathToFile];
		    return;
		  }
		  
		  var ajaxIndex = dynamicContent_ajaxObjects.length;
		  dynamicContent_ajaxObjects[ajaxIndex] = new sack();
		  dynamicContent_ajaxObjects[ajaxIndex].requestFile = pathToFile;
		
		  dynamicContent_ajaxObjects[ajaxIndex].onCompletion = 
		  function(){ ajax_showContent(divId,ajaxIndex,pathToFile); };  
		
		  dynamicContent_ajaxObjects[ajaxIndex].runAJAX();  
}

function ajax_showContent(divId,ajaxIndex,pathToFile){
  document.getElementById(divId).innerHTML =
    dynamicContent_ajaxObjects[ajaxIndex].response;
  if(enableCache){
    jsCache[pathToFile] = 
    dynamicContent_ajaxObjects[ajaxIndex].response;
  }
  dynamicContent_ajaxObjects[ajaxIndex] = false;
}


function assegnaXMLHttpRequest() {
			var
				XHR = null,
				browserUtente = navigator.userAgent.toUpperCase();
			if(typeof(XMLHttpRequest) === "function" || typeof(XMLHttpRequest) === "object")
				XHR = new XMLHttpRequest();
			else if(window.ActiveXObject && browserUtente.indexOf("MSIE 4") < 0) {
				if(browserUtente.indexOf("MSIE 5") < 0)
					XHR = new ActiveXObject("Msxml2.XMLHTTP");	
				else
					XHR = new ActiveXObject("Microsoft.XMLHTTP");
			}
			return XHR;	
}



function send_ajax(id){
			// alert("entrato nella richiesta ajax")
			var ajax = assegnaXMLHttpRequest();
			
			// se l'oggetto XMLHttpRequest non ? nullo
			if(ajax) {
		
			var url = "page.jsp?idPagina=" +  id;
	
			// impostazione richiesta asincrona in GET
			ajax.open("get", url, true);
		
			// rimozione dell'header "connection" come "keep alive"
			ajax.setRequestHeader("connection", "close");
		
			// impostazione controllo e stato della richiesta
			ajax.onreadystatechange = function() {
		
				// verifica dello stato
				if(ajax.readyState === readyState.COMPLETATO) {
					if(statusText[ajax.status] === "OK"){
						
						var output = ajax.responseText
						document.getElementById('scheda').innerHTML = output;						
						}
						
					}
					else {
						var output =  "Impossibile effettuare l'operazione richiesta.<br />";
						// output += "Errore riscontrato: " + statusText[ajax.status];
						// document.getElementById('scheda').innerHTML = output;	
					}
			
			} // fine della funzione di callback

			// invio richiesta
			ajax.send(null);
		
			}
				
}
		
function send(id,url){
			// alert("entrato nella richiesta ajax")
			var ajax = assegnaXMLHttpRequest();
			
			// se l'oggetto XMLHttpRequest non ? nullo
			if(ajax) {
		
	
			// impostazione richiesta asincrona in GET
			ajax.open("get", url, true);
		
			// rimozione dell'header "connection" come "keep alive"
			ajax.setRequestHeader("connection", "close");
		
			// impostazione controllo e stato della richiesta
			ajax.onreadystatechange = function() {
		
				// verifica dello stato
				if(ajax.readyState === readyState.COMPLETATO) {
					if(statusText[ajax.status] === "OK"){
						
						var output = ajax.responseText
						document.getElementById(id).innerHTML = output;						
						document.getElementById(id).style.display='block';
						}
						
					}
					else {
						var output =  "Impossibile effettuare l'operazione richiesta.<br />";
						// output += "Errore riscontrato: " + statusText[ajax.status];
						// document.getElementById('scheda').innerHTML = output;	
					}
			
			} // fine della funzione di callback

			// invio richiesta
			ajax.send(null);
		
			}
				
}


/** OGGETTI / ARRAY */

	// oggetto di verifica stato
		var readyState = {
			INATTIVO:	0,
			INIZIALIZZATO:	1,
			RICHIESTA:	2,
			RISPOSTA:	3,
			COMPLETATO:	4
		};

	// array descrittivo dei codici restituiti dal server
	// [la scelta dell' array ? per evitare problemi con vecchi browsers]
		var statusText = new Array();
		statusText[100] = "Continue";
		statusText[101] = "Switching Protocols";
		statusText[200] = "OK";
		statusText[201] = "Created";
		statusText[202] = "Accepted";
		statusText[203] = "Non-Authoritative Information";
		statusText[204] = "No Content";
		statusText[205] = "Reset Content";
		statusText[206] = "Partial Content";
		statusText[300] = "Multiple Choices";
		statusText[301] = "Moved Permanently";
		statusText[302] = "Found";
		statusText[303] = "See Other";
		statusText[304] = "Not Modified";
		statusText[305] = "Use Proxy";
		statusText[306] = "(unused, but reserved)";
		statusText[307] = "Temporary Redirect";
		statusText[400] = "Bad Request";
		statusText[401] = "Unauthorized";
		statusText[402] = "Payment Required";
		statusText[403] = "Forbidden";
		statusText[404] = "Not Found";
		statusText[405] = "Method Not Allowed";
		statusText[406] = "Not Acceptable";
		statusText[407] = "Proxy Authentication Required";
		statusText[408] = "Request Timeout";
		statusText[409] = "Conflict";
		statusText[410] = "Gone";
		statusText[411] = "Length Required";
		statusText[412] = "Precondition Failed";
		statusText[413] = "Request Entity Too Large";
		statusText[414] = "Request-URI Too Long";
		statusText[415] = "Unsupported Media Type";
		statusText[416] = "Requested Range Not Satisfiable";
		statusText[417] = "Expectation Failed";
		statusText[500] = "Internal Server Error";
		statusText[501] = "Not Implemented";
		statusText[502] = "Bad Gateway";
		statusText[503] = "Service Unavailable";
		statusText[504] = "Gateway Timeout";
		statusText[505] = "HTTP Version Not Supported";
		statusText[509] = "Bandwidth Limit Exceeded";
		
		
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;

	this.onLoading = function() { };
	this.onLoaded = function() { };
	this.onInteractive = function() { };
	this.onCompletion = function() { };

	this.createAJAX = function() {
		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; 
		}
	};
	
	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);
	}
	
	this.runAJAX = function(urlstring){
		this.responseStatus = new Array(2);
		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;
					}
				};
			}
		}
	};
this.createAJAX();
}