var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
	var i;
	for (i = 0; i < s.length; i++){   
		// Check that current character is number.
		var c = s.charAt(i);
		if (((c < "0") || (c > "9"))) return false;
	}
	// All characters are numbers.
	return true;
}

function stripCharsInBag(s, bag){
	var i;
	var returnString = "";
	// Search through string's characters one by one.
	// If character is not in bag, append to returnString.
	for (i = 0; i < s.length; i++){   
		var c = s.charAt(i);
		if (bag.indexOf(c) == -1) returnString += c;
	}
	return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
	// EXCEPT for centurial years which are not also divisible by 400.
	return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(pos1+1,pos1)
	var strDay=dtStr.substring(0,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("Il formato della data deve essere : gg/mm/aaaa")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Inserire un numero di mese valido")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Inserire un giorno valido")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Inserire l'anno in formato 4 cifre compreso tra "+minYear+" e "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Inserire una data valida")
		return false
	}
return true
}

function ValidateForm(form_Element){
	var dt=form_Element
	if (isDate(dt.value)==false){
		dt.focus()
		return false
	}
	return true
 }

function checkFormFields(thisForm, fieldsToCheckArray) {
	emptyFields = "";

	if (!thisForm.elements["privacy"][0].checked) {
		alert ("Per poter preiscriversi bisogna dare il proprio consenso alla tutela dei dati personali");
		return false
	}
	
	for (var fieldToCheck in fieldsToCheckArray) {
		if (thisForm.elements[fieldsToCheckArray[fieldToCheck]].value == "") {
			if (emptyFields == "") {
				emptyFields = "Attenzione i seguenti campi devono essere compilati:\n\r";
			}
			emptyFields = emptyFields + "- " + fieldsToCheckArray[fieldToCheck] + "\n\r";
		}
	}
	if (emptyFields != "") {
		alert (emptyFields);
		return false
	}
	
	if (thisForm.email.value!="") {
		if (thisForm.email.value.indexOf("@")==-1 || thisForm.email.value.indexOf(".")==-1 || thisForm.email.value.indexOf(" ")!=-1 || thisForm.email.value.length<6) {
			alert("Attemzione! L'indirizzo mail non è valido");
			thisForm.email.focus();
			return false
		}
	}
	
	return ValidateForm(thisForm.datanascita);
}

function checkFormFields_reg(thisForm, fieldsToCheckArray) {
	emptyFields = "";

	if ((!thisForm.elements["consenso1"][0].checked) || (!thisForm.elements["consenso2"][0].checked)) {
		alert ("Per poter preiscriversi bisogna dare il proprio consenso al trattamento dei dati personali");
		return false
	}
	
	for (var fieldToCheck in fieldsToCheckArray) {
		if (thisForm.elements[fieldsToCheckArray[fieldToCheck]].value == "") {
			if (emptyFields == "") {
				emptyFields = "Attenzione i seguenti campi devono essere compilati:\n\r";
			}
			emptyFields = emptyFields + "- " + fieldsToCheckArray[fieldToCheck] + "\n\r";
		}
	}
	if (emptyFields != "") {
		alert (emptyFields);
		return false
	}
	
	if (thisForm.email1.value!="") {
		if (thisForm.email1.value.indexOf("@")==-1 || thisForm.email1.value.indexOf(".")==-1 || thisForm.email1.value.indexOf(" ")!=-1 || thisForm.email1.value.length<6) {
			alert("Attemzione! L'indirizzo e-mail non è valido");
			thisForm.email1.focus();
			return false
		}
	}
	
	return ValidateForm(thisForm.datanascita);
}

function checkFormFields_search(thisForm, fieldsToCheckArray) {
	emptyFields = "";

	for (var fieldToCheck in fieldsToCheckArray) {
		if (thisForm.elements[fieldsToCheckArray[fieldToCheck]].value == "") {
			if (emptyFields == "") {
				emptyFields = "Attenzione i seguenti campi devono essere compilati:\n\r";
			}
			emptyFields = emptyFields + "- " + fieldsToCheckArray[fieldToCheck] + "\n\r";
		}
	}
	if (emptyFields != "") {
		alert (emptyFields);
		return false
	}
}