// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
//
// 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.
//
// Update Jun 2005: discovered that reason IE wasn't setting focus was
// due to an IE timing bug. Added 0.1 sec delay to fix.
//
// Update Oct 2005: minor tidy-up: unused parameter removed
//
// Update Jun 2006: minor improvements to variable names and layout
// ----------------------------------------------------------------------

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, '');
}



// --------------------------------------------
//             trimNumber
// trim leading 0 (zero) from text input fields
// --------------------------------------------
function trimNumber(s) {
	return s.replace(/^0+/, '');
}




// --------------------------------------------
//                  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 el = document.getElementById(fld);
	var dispmessage;
	
	if (emptyString.test(message))
  {
		removeElement(el);
	}
  else 
  {
		removeElement(el);

		var elTxt = document.createTextNode(message);
		var divTag = document.createElement("DIV");

		divTag.setAttribute('class', msgtype);

		divTag.appendChild(elTxt);
		el.appendChild(divTag);
  }
}

function removeElement(el)
{
	while ( el.childNodes.length > 1 )
	{
		el.removeChild( el.lastChild );       
	} 
}



// --------------------------------------------
//            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 ( emptyString.test(valfield.value) )
	{
		if (required)
		{
			msg1 (infofield, "error", "NAPAKA: potrebno izpolniti");  
	     // msg1 (infofield, "error", "*");  
			setfocus(valfield);
			return false;
	    }
	    else 
	    {
			msg1 (infofield, "warn_off", "");   // OK
			return true;  
	    }
	}
  
	return proceed;
}

// --------------------------------------------
//            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
                         required) // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;

  msg1 (infofield, "warn_off", "");  
  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)) {
    msg1 (infofield, "error", "NAPAKA: nepravilen e-mail naslov");
    setfocus(valfield);
    return false;
  }

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!email2.test(tfld)) {
//    msg1 (infofield, "warn", "Unusual e-mail address - check if correct");
    msg1 (infofield, "warn", "Posebni znaki, ki so dovoljeni: _ . -");
    setfocus(valfield);
    return false;
  } else
    msg1 (infofield, "warn_off", "");
    
  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)) {
//    msg1 (infofield, "error", "ERROR: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
    msg1 (infofield, "error", "NAPAKA: napačna telefonska. Dovoljeni znaki so: števila, presledek ()- in +");
    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) {
//    msg1 (infofield, "error", "ERROR: " + numdigits + " digits - too short");
    msg1 (infofield, "error", "NAPAKA: premalo številk ");
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
//    msg1 (infofield, "warn", numdigits + " digits - check if correct");
    msg1 (infofield, "warn", "Preveri pravilnost vpisa");
  else { 
      msg1 (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)) {
    msg1 (infofield, "error", "NAPAKA: nepravilna starost");
//    msg1 (infofield, "error", "ERROR: not a valid age");
    setfocus(valfield);
    return false;
  }

  if (tfld>=200) {
    msg1 (infofield, "error", "NAPAKA: nepravilna starost");
//    msg1 (infofield, "error", "ERROR: not a valid age");
    setfocus(valfield);
    return false;
  }

  if (tfld>110) 
//  	msg1 (infofield, "warn", "Older than 110: check correct");
  	msg1 (infofield, "warn", "Starejši od 110: preveri pravilnost starosti");
  else {
    if (tfld<7) 
//    	msg1 (infofield, "warn", "Bit young for this, aren't you?");
    	msg1 (infofield, "warn", "Premlad za to?");
    else        
    	msg1 (infofield, "warn", "");
  }
  return true;
}


// --------------------------------------------
//             validateNumber
// Validate numebr
// Returns true if OK 
// --------------------------------------------

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

  var nfld = trim(valfield.value);
  var numRE = /^[0-9]*$/;
  nfld = trimNumber(nfld);

  if (!numRE.test(nfld)) {
    msg1 (infofield, "error", "NAPAKA: ni število");
    setfocus(valfield);
    return false;
  }

	if(nfld.length > length && length!='')
	{
		nfld = nfld.substring(0,length);
	}

	valfield.value = nfld;
	
  msg1 (infofield, "warn_off", "");  
  return true;
}



// --------------------------------------------
//             validateRadioButton
// Validate numebr
// Returns true if OK 
// --------------------------------------------

function validateRadioButton (valfield,   // element to be validated
                         		  infofield,  // id of element to receive info/error msg
                              required)     // true if required
{
	var isChecked = false;

	if( valfield.checked == true && valfield.length == undefined)
		isChecked = true;
		
	for (i=0; i<valfield.length; i++)
	{
		if( valfield[i].checked == true )
			isChecked = true;
	}

	if(isChecked == false && required == true)
	{
    msg1(infofield, "error", "NAPAKA: portebno izpolniti");
    return false;
  }

  msg1 (infofield, "warn_off", "");
  return true;
}


function msg1(fld,     // id of element to display message in
              msgtype, // class to give element ("warn" or "error")
              message)
{
	var el = document.getElementById(fld);

	if (emptyString.test(message))
  {
		el.innerHTML = message;
		el.style.visibility = "hidden";
	}
  else 
  {
		el.innerHTML = message;
		el.style.visibility = "visible";
  }
}