// ----------------------------------------------------------------------
// 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
var language="NL"

// Error messages
var errormessages= {
NL: {not_integer: 'alleen getallen zijn toegestaan', required: 'dit veld is verplicht',
    invalid_email: 'email is niet correct', invalid_phone: 'telefoonnummer is niet correct. Alleen nummers, spaties,+ en - toegestaan',
    nomessage: ' ', not_amount: 'bedrag is niet correct. Voorbeeld 123,75, 1.250,95',
    short_phone: 'telefoon nummer te kort', long_phone: 'telefoon nummer te lang',
    passwords_different: 'de wachtwoorden zijn verschillend', not_date: 'datum is niet correct. Formaat is \'JJJJ-MM-DD\', \'2008-12-31\'',
    not_year: 'jaar ligt niet tussen 1900 en 2050', not_month: 'maand is niet correct (1-12)', not_day: 'dag is niet correct (1-31)',
    day_incorrect: 'deze maand heeft geen 31 dagen', not_leapyear: 'in dit jaar heeft februari maar 28 dagen',
    is_leapyear: 'in dit jaar heeft februari 29 dagen',
    not_percentage: 'percentage is niet correct. Voorbeelden 50, 17,5 of 12,75 met een maximum van 100',
    not_workedhours: 'opgegeven uren zijn niet correct. Uren mogen niet groter zijn dan 24. 1,5 is anderhalf uur.'
    },
UK: {not_integer: 'only numbers are allowed', required: 'this field must be filled in',
    invalid_email: 'email is not valid', invalid_phone: 'phone number is not valid. Only numbers, spaces, + and - allowed',
    nomessage: ' ', not_amount: 'amount is not correct. Examples 125,75, 1.250,95',
    short_phone: 'phone number too short', long_phone: 'phone number too long',
    passwords_different: 'the passwords don\'t match', not_date: 'datum is not correct. Format must be \'YYYY-MM-DD\', \'2008-12-31\'',
    not_year: 'year does not lie between 1900 and 2050', not_month: 'month is not correct (1-12)', not_day: 'day is not correct (1-31)',
    day_incorrect: 'this month does not have 31 days', not_leapyear: 'in this year February has 28 days',
    is_leapyear: 'in this year February has 29 days',
    not_percentage: 'percentage is not correct. Examples 50, 17,5 or 12,75 with a maximum of 100',
    not_workedhours: 'hours are not correct. Hours must be smaller than 24. 1,5 is one hour and a half.'
    }
}

function geterrormessage(errorcode) {
    return errormessages[language][errorcode];
}
// --------------------------------------------
//                  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", geterrormessage("required"));  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", geterrormessage("nomessage"));   // 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
{
  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;

  if(valfield=='') {
    msg (infofield, "error", geterrormessage("invalid_email"));
    setfocus(valfield);
    return false;    
  }
  msg (infofield, "warn", geterrormessage("nomessage"));  
  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", geterrormessage("invalid_email"));
    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", geterrormessage("strange_email"));
  else
    msg (infofield, "warn", geterrormessage("nomessage"));
  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", geterrormessage("invalid_phone"));
    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", geterrormessage("short_phone"));
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
    msg (infofield, "warn", geterrormessage("long_phone"));
  else { 
    if (numdigits<10)
      msg (infofield, "warn", "Only " + numdigits + " digits - check if correct");
    else
      msg (infofield, "warn", "");
  }
  msg (infofield,"",geterrormessage("nomessage"));
  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", geterrormessage("not_integer"));
    setfocus(valfield);
    return false;
  }

  if (tfld>=200) {
    msg (infofield, "error", geterrormessage("age_too_old"));
    setfocus(valfield);
    return false;
  }

  if (tfld>110) msg (infofield, "warn", geterrormessage("age_old"));
  else {
    if (tfld<7) msg (infofield, "warn", geterrormessage("age_too_young"));
    else        msg (infofield, "warn", geterrormessage("nomessage"));
  }
  return true;
}

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

function validateInteger (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 integerRE = /^\d*$/
  if (!integerRE.test(tfld)) {
    msg (infofield, "error", geterrormessage("not_integer"));
    setfocus(valfield);
    return false;
  } else {
    msg (infofield, "error", geterrormessage("nomessage"));
    return true;
  }
}

function validatePercentage (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 percentageRE = /^((\d{0,3})|(\d{0,3}(,\d{1,2}))|(\d{0,3}(.\d{1,2})))$/
  if (!percentageRE.test(tfld)) {
    msg (infofield, "error", geterrormessage("not_percentage"));
    setfocus(valfield);
    return false;
  } else if(tfld>100) {
    msg (infofield, "error", geterrormessage("not_percentage"));
    setfocus(valfield);
    return false;
  } else {
    msg (infofield, "error", geterrormessage("nomessage"));
    return true;
  }
}
function validateHours (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 percentageRE = /^((\d{0,3})|(\d{0,3}(,\d{1,2}))|(\d{0,3}(.\d{1,2})))$/
  if (!percentageRE.test(tfld)) {
    msg (infofield, "error", geterrormessage("not_workedhours"));
    setfocus(valfield);
    return false;
  } else if(tfld>24) {
    msg (infofield, "error", geterrormessage("not_workedhours"));
    setfocus(valfield);
    return false;
  } else {
    msg (infofield, "error", geterrormessage("nomessage"));
    return true;
  }
}

function validatePassword (valfield1,   // element to be validated
                           valfield2,
                         infofield,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield1, infofield, required);
  if (stat != proceed) return stat;
  var stat = commonCheck (valfield2, infofield, required);
  if (stat != proceed) return stat;

  var password1 = trim(document.getElementById(valfield1).value);
  var password2 = trim(valfield2.value);
  if(password1=='') {
    msg (infofield, "error", geterrormessage("required"));
    setfocus(valfield);
    return false;    
  } else if(password2=='') {
    msg (infofield, "error", geterrormessage("required"));
    setfocus(valfield);
    return false;    
  } else if(password1!=password2) {
    msg (infofield, "error", geterrormessage("passwords_different"));
    return false;    
  } else {
    msg (infofield, "", geterrormessage("nomessage"));
    return true;
  }
}
function validateAmount (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);
  // amountRE= -123123 or -123123.50 or -12.123.345,00
  // |(^-?\d{1,3}(.\d{3})*,d{2})
  // |(^-?\d*\,\d{2})|(^-?\d{1,3}[.\d{3}]*)
  //|(^-?\d{1,3}(.\d{3})*)
  // |(^-?\d*,\d{2})
  var amountRE=/^((\-?\d*)|(\-?\d*(,\d{2}))|(\-?\d{1,3}(.\d{3})*(,\d{2})))$/;

  if (!amountRE.test(tfld)) {
    msg (infofield, "error", geterrormessage("not_amount"));
    setfocus(valfield);
    return false;
  } else {
    msg (infofield, "", geterrormessage("nomessage"));
    return true;
  }    
}
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);
  var DateRE=/^\d{4}\-\d{1,2}\-\d{1,2}$/;
  if (!DateRE.test(tfld)) {
    msg (infofield, "error", geterrormessage("not_date"));
    setfocus(valfield);
    return false;
  } else {
    var fulldate=tfld.split('-');
    var year=fulldate[0]
    var month=fulldate[1]
    var day=fulldate[2]
    if((year<1900)||(year>2050)) {
        msg (infofield, "error", geterrormessage("not_year"));
        setfocus(valfield);
        return false;
    } else if((month>12)||(month<1)) {
        msg (infofield, "error", geterrormessage("not_month"));    
        setfocus(valfield);
        return false;
    } else if((day>31)||(day<1)) {
        msg (infofield, "error", geterrormessage("not_day"));    
        setfocus(valfield);
        return false;
    } else if ((month==4 || month==6 || month==9 || month==11) && day==31) {
        msg (infofield, "error", geterrormessage("day_incorrect"));    
        setfocus(valfield);
        return false;
    } else if (month == 2) { // check for february 29th
        var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
        if (day>=29 && !isleap) {
            msg (infofield, "error", geterrormessage("not_leapyear"));
            setfocus(valfield);
            return false;
        } else if(day>29) {
            msg (infofield, "error", geterrormessage("is_leapyear"));
            setfocus(valfield);
            return false;        
        }
    } 
    msg (infofield, "", geterrormessage("nomessage"));    
    return true;
  }
}