// Datum controle incl controles op ongeldige datum (bijv 30 feb)
/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// 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 strMonth=dtStr.substring(pos1+1,pos2)
	var strDay=dtStr.substring(0,pos1)
	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("Vul s.v.p. een juiste datum in ! Juiste formaat is dd-mm-jjjj")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Voer s.v.p. een geldige maand in")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Voer s.v.p. een geldige dag in")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Voer een geldig jaartal (4 cijfers) in tussen "+minYear+" en "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
		alert("Voer s.v.p. een geldige dag in")
		return false
	}
return true
}

function ValidateForm(dt,dtCh){
	if (isDate(dt)==false){
		return false
	}
    return true
 }
// Einde datum controle incl controles op ongeldige datum (bijv 30 feb)






// functie isvalidate: datum controle incl. voorloopnullen plaatsen (worden niet getoont!!

 function y2k(number) { return (number < 1000) ? number + 1900 : number; }
 var reason = ''; 

 function isValidDate (myDate,sep) {
 // checks if date passed is in valid dd/mm/yyyy format
     if (myDate.charAt(1) == sep) myDate = '0'+myDate
     if (myDate.charAt(4) == sep) myDate = myDate.substring(0,3)+'0'+myDate.substring(3,10)
     if (myDate.length == 10) {
         if (myDate.substring(2,3) == sep && myDate.substring(5,6) == sep) {
             var date  = myDate.substring(0,2);
             var month = myDate.substring(3,5);
             var year  = myDate.substring(6,10);
 
             var test = new Date(year,month-1,date);
 
             if (year == y2k(test.getYear()) && (month-1 == test.getMonth()) && (date == test.getDate())) {
                 reason = '';
                 return true;
             }
             else {
                 reason = 'valid format but an invalid date';
                 return false;
             }
         }
         else {
             reason = 'invalid separators';
             return false;
         }
     }
     else {
         reason = 'invalid length';
         return false;
		 }
 }
// einde datum controle 

// functie trim: haalt overbodige spaties weg

function trim(strText) {
while (strText.substring(0,1) == ' ')
    strText = strText.substring(1, strText.length);
while (strText.substring(strText.length-1,strText.length) == ' ')
    strText = strText.substring(0, strText.length-1);
return strText;
}
//einde trim

//functie check: controle inhoud veld alleen numeriek

function check(contents,formfield) {
   if (((contents / contents) != 1) && (contents != 0)) {alert('Hier kunnen alleen cijfers ingevoerd worden! Denk er aan, gebruik een punt i.p.v. komma voor het weergeven van decimalen!');formfield.focus();
 }
}
//einde Check

//functie emailvalidation: controle juiste invoer e-mail adres
function emailvalidation(entered, alertbox) {
 var v = entered
 apos=v.indexOf('@'); 
 dotpos=v.lastIndexOf('.');
 lastpos=v.length-1;
 //if (apos<1 || dotpos-apos<2 || lastpos-dotpos>4 || lastpos-dotpos<2) {
 if (apos<1 || dotpos-apos<2 || lastpos-dotpos<2) {
   if (alertbox) {
      alert(alertbox);
   }
   return false;
   } else {
   return true;
  }
}
//einde emailvalidation