// check news form data
function newsFormValid(form) {
	//title field
	if (form.newsTitle.value == "") {
		alert("Field \"Title\" is required!");
		form.newsTitle.focus();
		return false ;
	}
	//date field
	if (form.newsDate.value == "") {
		alert("Field \"Date\" is required!");
		form.newsDate.focus();
		return false ;
	} else {
		if (isDate(form.newsDate.value)==false) {
			form.newsDate.focus();
			return false ;
		}
	}
		
	//news field
	if (form.newsText.value == "") {
		alert("Field \"News\" is required!") ;
		form.newsText.focus();
		return false ;
	}
	
	return true ;
}

//clear file input field
function clearFile(field) {
	//document.getElementById(field).value = "";
	//alert("field name: " + field);
	/*
	document.getElementById(field).setAttribute('type', 'input');
	document.getElementById(field).setAttribute('type', 'file');
	*/
	document.getElementById(field).innerHTML = document.getElementById(field).innerHTML; 
}

//show loading bar...
function loader() {
	document.getElementById('loading').style.visibility="visible";
}

//check required fields
function checkform(form) {

	var posizioneZero, estensione, trovato, i;
	var estensioni = new Array("doc", "jpeg", "jpg", "pdf", "ppt", "rtf", "xls", "zip");

	//file field + file type
	if (form.fileup.value == "") {
		alert("Field \"File\" is required!");
		form.fileup.focus();
		return false ;
	} else {
		posizioneZero = form.fileup.value.lastIndexOf('.');
		estensione = form.fileup.value.substr((posizioneZero+1), 3);
		
		trovato = false;
		i = 0;
		if (form.fileup.value != "") {
			
			for (i = 0; i < estensioni.length; i++) {
				if (estensioni[i] == estensione) {
					trovato = true;
				}
			}
			
			if (!trovato) {
				alert("Invalid file type.");
				form.fileup.focus();
				return false;
			}
		}
	}
	
	//title field
	if (form.titolo.value == "") {
		alert("Field \"Title\" is required!");
		form.titolo.focus();
		return false ;
	}
	
	//author field
	if (form.autore.value == "") {
		alert("Field \"Author/s\" is required!");
		form.autore.focus();
		return false ;
	}

	loader();
	return true ;
}

// Declaring valid date character, minimum year and maximum year
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 strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,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("The date format should be : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
return true
}

function confermaRimozioneNote(idNoteToRemove) {
	var answer = confirm("Do you want to remove this news?");
	if (answer) {
		location.replace("portaladmin.php?rmnewssubmit="+idNoteToRemove);
	}
}