/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* ©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.xmlhttp = null;

	this.resetData = function() {
		this.method = "POST";
  		this.queryStringSeparator = "?";
		this.argumentSeparator = "&";
		this.URLString = "";
		this.encodeURIString = true;
  		this.execute = false;
  		this.element = null;
		this.elementObj = null;
		this.requestFile = file;
		this.vars = new Object();
		this.responseStatus = new Array(2);
  	};

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

	this.reset = function() {
		this.resetFunctions();
		this.resetData();
	};

	this.createAJAX = function() {
		if (document.all)
			try {
				this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e1) {
				try {
					this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e2) {
					this.xmlhttp = null;
				}
			}

		if (! this.xmlhttp) {
			if (typeof XMLHttpRequest != "undefined") {
				this.xmlhttp = new XMLHttpRequest();
			} else {
				this.failed = true;
			}
		}
	};

	this.setVar = function(name, value){
		this.vars[name] = Array(value, false);
	};

	this.encVar = function(name, value, returnvars) {
		if (true == returnvars) {
			return Array(encodeURIComponent(name), encodeURIComponent(value));
		} else {
			this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
		}
	}

	this.processURLString = function(string, encode) {
		encoded = encodeURIComponent(this.argumentSeparator);
		regexp = new RegExp(this.argumentSeparator + "|" + encoded);
		varArray = string.split(regexp);
		for (i = 0; i < varArray.length; i++){
			urlVars = varArray[i].split("=");
			if (true == encode){
				this.encVar(urlVars[0], urlVars[1]);
			} else {
				this.setVar(urlVars[0], urlVars[1]);
			}
		}
	}

	this.createURLString = function(urlstring) {
		if (this.encodeURIString && this.URLString.length) {
			this.processURLString(this.URLString, true);
		}

		if (urlstring) {
			if (this.URLString.length) {
				this.URLString += this.argumentSeparator + urlstring;
			} else {
				this.URLString = urlstring;
			}
		}

		// prevents caching of URLString
		this.setVar("rndval", new Date().getTime());

		urlstringtemp = new Array();
		for (key in this.vars) {
			if (false == this.vars[key][1] && true == this.encodeURIString) {
				encoded = this.encVar(key, this.vars[key][0], true);
				delete this.vars[key];
				this.vars[encoded[0]] = Array(encoded[1], true);
				key = encoded[0];
			}

			urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
		}
		if (urlstring){
			this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);
		} else {
			this.URLString += urlstringtemp.join(this.argumentSeparator);
		}
	}

	this.runResponse = function() {
		eval(this.response);
	}

	this.runAJAX = function(urlstring) {
		if (this.failed) {
			this.onFail();
		} else {
			this.createURLString(urlstring);
			if (this.element) {
				this.elementObj = document.getElementById(this.element);
			}
			if (this.xmlhttp) {
				var self = this;
				if (this.method == "GET") {
					totalurlstring = this.requestFile;
					if (totalurlstring.indexOf(this.queryStringSeparator)==-1){
						totalurlstring += this.queryStringSeparator;
					} else {
						totalurlstring += this.argumentSeparator;
					}
					totalurlstring += this.URLString;
					this.xmlhttp.open(this.method, totalurlstring, true);
				} else {
					this.xmlhttp.open(this.method, this.requestFile, true);
					try {
						this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
					} catch (e) { }
				}

				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;

							if (self.execute) {
								self.runResponse();
							}

							if (self.elementObj) {
								elemNodeName = self.elementObj.nodeName;
								//se sto riempiendo una select e sono su IE
								if ((elemNodeName == "SELECT") && !(typeof(window.innerWidth)=='number') ) {
									//alert("using json to fill select in IE");
								    var oJSON = eval('(' + self.response + ')');
							        self.elementObj.options[0] = null;
							        self.elementObj.options[0] = null;
							        self.elementObj.options[0] = null;
								    for(nOpt in oJSON) {
								        self.elementObj.options[self.elementObj.options.length] = new Option(oJSON[nOpt][0],oJSON[nOpt][1]);
     								};
								} else {
									//alert("using innerhtml "+elemNodeName);
									self.elementObj.innerHTML = self.response;
								}
							}
							if (self.responseStatus[0] == "200") {
								self.onCompletion();
							} else {
								self.onError();
							}

							self.URLString = "";
							break;
					}
				};

				this.xmlhttp.send(this.URLString);
			}
		}
	};

	this.reset();
	this.createAJAX();
}

//funzione che riempie una select tramite sack
function fillSelect(element,querystring){
	var ajax = new sack();
	ajax.method = "GET";
	ajax.element = element;
	ajax.requestFile = "options.php"+querystring;
	ajax.runAJAX();
}

//funzione che richiama lo script di ping per il refresh delle liste
function ping(querystring,interval){
	var ajax = new sack();
	ajax.method = "GET";
	ajax.requestFile = "refresh.php"+querystring;
	ajax.runAJAX();
	setTimeout("ping('"+querystring+"',"+interval+");",interval);
}

//funzione che refresha ogni tot millisecondi un elemento di dato id
function reloadelem(element,url,interval){
	var ajax = new sack(url);
	ajax.method = "GET";
	ajax.element = element;
	ajax.requestFile = url;
	ajax.runAJAX();
	setTimeout("reloadelem('"+element+"','"+url+"',"+interval+");",interval);
}

//funzione in disuso per riempire le select in IE
function addElementIE(ogg,val,text){
  var newOption;
  newOption = document.createElement("option");
  newOption.value = val;
  newOption.text = text;
  ogg.add(newOption, where);
}