// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
// http://www.xs4all.nl/~sbpoley/webmatters/formval.html
// Simple routines to quickly pick up obvious typos.
// All validation routines return true if executed by an older browser:
// in this case validation must be left to the server.
// ----------------------------------------------------------------------

var nbsp = 160;		// non-breaking space char
var node_text = 3;	// DOM text node-type
var emptyString = /^\s*$/ ;
var global_valfield;	// retain valfield for timer thread

// --------------------------------------------
//                  trim
// Trim leading/trailing whitespace off string
// --------------------------------------------

function trim(str)
{
  return str.replace(/^\s+|\s+$/g, '');
}


// --------------------------------------------
//                  setfocus
// Delayed focus setting to get around IE bug
// --------------------------------------------

function setFocusDelayed()
{
  global_valfield.focus();
}

function setfocus(valfield)
{
  // save valfield in global variable so value retained when routine exits
  global_valfield = valfield;
  setTimeout( 'setFocusDelayed()', 100 );
}


// --------------------------------------------
//                  msg
// Display warn/error message in HTML element.
// commonCheck routine must have previously been called
// --------------------------------------------

function msg(fld,     // id of element to display message in
             msgtype, // class to give element ("warn" or "error")
             message) // string to display
{
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)
  var dispmessage;
  if (emptyString.test(message)) 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = message;

  var elem = document.getElementById(fld);
  elem.firstChild.nodeValue = dispmessage;  
  
  elem.className = msgtype;   // set the CSS class to adjust appearance of message
}

// --------------------------------------------
//            commonCheck
// Common code for all validation routines to:
// (a) check for older / less-equipped browsers
// (b) check if empty fields are required
// Returns true (validation passed), 
//         false (validation failed) or 
//         proceed (don't know yet)
// --------------------------------------------

var proceed = 2;  

function commonCheck    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  if (!document.getElementById) 
    return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(infofield);
  if (!elem.firstChild) return true;  // not available on this browser 
  if (elem.firstChild.nodeType != node_text) return true;  // infofield is wrong type of node  

  if (emptyString.test(valfield.value)) {
    if (required) {
      msg (infofield, "error", "ERROR: mandatory field");  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

// --------------------------------------------
//            check_OnlyThisChar
// Validate if only allowed chars (as set in
// each specific control) are used
// Returns true if so 
// --------------------------------------------

function check_OnlyThisChar(Eingabe, valid_char) {
    for (var i = 0; i < Eingabe.length; i++) {
        if (valid_char.indexOf(Eingabe.charAt(i))<0 ) {
            return false;
        }
    }
    return true;
}

// --------------------------------------------
//            validatePresent
// Validate if something has been entered
// Returns true if so 
// --------------------------------------------

function validatePresent(valfield,   // element to be validated
                         infofield ) // id of element to receive info/error msg
{
  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;

  msg (infofield, "warn", "");  
  return true;
}

// --------------------------------------------
//               validateEmail
// Validate if e-mail address
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateEmail  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/  ;
  
  
  if (!email.test(tfld)) {
    msg (infofield, "error", "ERROR: not a valid e-mail address");
    setfocus(valfield);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!email2.test(tfld)) 
    msg (infofield, "warn", "Unusual e-mail address - check if correct");
  else
    msg (infofield, "warn", "");
  return true;
}


// --------------------------------------------
//            validateTelnr
// Validate telephone number
// Returns true if so (and also if could not be executed because of old browser)
// Permits spaces, hyphens, brackets and leading +
// --------------------------------------------

function validateTelnr  (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-]+[0-9]$/  ;
  if (!telnr.test(tfld)) {
    msg (infofield, "error", "ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
    setfocus(valfield);
    return false;
  }

  var numdigits = 0;
  for (var j=0; j<tfld.length; j++)
    if (tfld.charAt(j)>='0' && tfld.charAt(j)<='9') numdigits++;

  if (numdigits<6) {
    msg (infofield, "error", "ERROR: " + numdigits + " digits - too short");
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
    msg (infofield, "warn", numdigits + " digits - check if correct");
  else { 
    if (numdigits<10)
      msg (infofield, "warn", "Only " + numdigits + " digits - check if correct");
    else
      msg (infofield, "warn", "");
  }
  return true;
}

// --------------------------------------------
//             validateAge
// Validate person's age
// Returns true if OK 
// --------------------------------------------

function validateAge    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  var tfld = trim(valfield.value);
  var ageRE = /^[0-9]{1,3}$/
  if (!ageRE.test(tfld)) {
    msg (infofield, "error", "ERROR: not a valid age");
    setfocus(valfield);
    return false;
  }

  if (tfld>=200) {
    msg (infofield, "error", "ERROR: not a valid age");
    setfocus(valfield);
    return false;
  }

  if (tfld>110) msg (infofield, "warn", "Older than 110: check correct");
  else {
    if (tfld<7) msg (infofield, "warn", "Bit young for this, aren't you?");
    else        msg (infofield, "warn", "");
  }
  return true;
}











// --------------------------------------------
//             validateDate
// Validate a date
// Returns true if OK 
// --------------------------------------------

function validateDate    (valfield,   // element to be validated
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
	 var stat = commonCheck (valfield, infofield, required);
	 if (stat != proceed) return stat;
	
	 var tfld = trim(valfield.value);
	 if (!check_OnlyThisChar(tfld,"0123456789/-")) {
	   msg (infofield, "error", "ERRORE: caratteri non validi");
	   setfocus(valfield);
	   return false;
	 }
	 if (tfld.length != 10) {
	   msg (infofield, "error", "ERRORE: data troppo corta");
	   setfocus(valfield);
	   return false;
	 }
	 if ((tfld.charAt(2) != "/") || (tfld.charAt(5) != "/")) {
	   msg (infofield, "error", "ERRORE: separatore non valido");
	   setfocus(valfield);
	   return false;
	 }
	var temp = 0;
	elemente = tfld.split("/");
	if (eval(elemente[0]) < 1 ) temp += "/ zu wenig tage"
	if (eval(elemente[0]) > 31 ) temp += "/ zu viel tage"
	if (elemente.length != 3) temp += "/ nicht 3 ";
	if (eval(elemente[1]) > 12 ) temp += "/ mehr als 12 monate ";
	if (eval(elemente[1]) < 1 ) temp += "/ weniger als 1 monat ";
	if (eval(elemente[2]) > 9999 ) temp += "/ mehr als 9999 ";
	if (eval(elemente[2]) < 1900 ) temp += "/ weniger als 1950 ";
	switch (eval(elemente[1]))
	{
		case 1: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 31) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 2: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(( (elemente[2])%4)==0) )
			{
				if (eval(elemente[0]) > 29) temp += "/ pblm im monat" + elemente[0];
			}
			else 
			{ if (eval(elemente[0]) > 28) temp += "/ pblm im monat" + elemente[0];
			}
		}
		break;
		case 3: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 31) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 4: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 30) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 5: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 31) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 6: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 30) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 7: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 31) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 8: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 31) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 9: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 30) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 10: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 31) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 11: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 30) temp += "/ pblm im monat" + elemente[0];
		}
		break;
		case 12: 
		{
			if (eval(elemente[0]) < 1) temp += "/ pblm im monat" + elemente[0];
			if (eval(elemente[0]) > 31) temp += "/ pblm im monat" + elemente[0];
		}
		break;
	}	
	if (temp != 0) {
	   msg (infofield, "error", "ERRORE: data non valida");
	   setfocus(valfield);
	   return false;
	}
	else {
		msg (infofield, "error", "");
	}
	return true;
}