// ----------------------------------------------------------------------
// 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, '');
}


// --------------------------------------------
//                  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", "Required");  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", "");   // OK
      return true;  
    }
  }
  return proceed;
}

// --------------------------------------------
//             compareFields
// Match 2 password fields. 
// --------------------------------------------

function compareFields(ctrl_pass1, ctrl_pass2, infofield) {
     if (ctrl_pass1.value == ctrl_pass2.value) {
          msg (infofield, "warn", "");
          return true;
     }
     else {
     msg (infofield, "error", "Your passwords do not match.");
          return false;
     }
}

// --------------------------------------------
//             validateAgeLegal
// Make sure user is at least 18. 
// --------------------------------------------

function validateAgeLegal(ctrl_year, ctrl_month, ctrl_day, infofield,  // id of element to receive info/error msg
                         minAge)
{
// get the values
var year = ctrl_year.options[ctrl_year.selectedIndex].value;
var month = ctrl_month.options[ctrl_month.selectedIndex].value;
var day = ctrl_day.options[ctrl_day.selectedIndex].value
var min_age = minAge;

// validate that items are selected
if((parseInt(year)!=year-0) ||(parseInt(day)!=day-0) ||(parseInt(month)!=month-0) ) {
   msg (infofield, "error", "You must be 18 years or older to register.");    
   return false;
}

// craete the date
var tmpYear = (parseInt(year) + parseInt(min_age));
var myDate=new Date()
myDate.setFullYear(tmpYear,month-1,day)
var today = Date();
// compare dates

if ( Date.parse(myDate) < Date.parse(today)   ) {
        msg (infofield, "warn", "");
		return true;
	}
	else {
		msg (infofield, "error", "You must be 18 years or older to register.");
		return false;
	}
}

// --------------------------------------------
//            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", "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 - Are you sure?");
  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 validateZip  (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]{5}$/

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

  if (numdigits!=5) {
    msg (infofield, "error", "5 digits needed.");
    setfocus(valfield);
    return false;
  }

//  if (numdigits>10)
//    msg (infofield, "warn", numdigits + " digits - Are you sure?");
//  else { 
//    if (numdigits<10)
//      msg (infofield, "warn", "Only " + numdigits + " digits - Are you sure?");
//    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 validateTelnr3  (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]$/  ;
  var telnr = /^[0-9]{3}$/

//  if (!telnr.test(tfld)) {
//    msg (infofield, "error", "Not a valid telephone number. Only digits, space, (, ), -, and leading + are permitted.");
//    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) {
  if (numdigits!=3) {
//    msg (infofield, "error", "" + numdigits + " digits - Too short.");
    msg (infofield, "error", "3 digits needed.");
    setfocus(valfield);
    return false;
  }

//  if (numdigits>10)
//    msg (infofield, "warn", numdigits + " digits - Are you sure?");
//  else { 
//    if (numdigits<10)
//      msg (infofield, "warn", "Only " + numdigits + " digits - Are you sure?");
//    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 validateTelnr4  (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]{4}$/

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

  if (numdigits!=4) {
    msg (infofield, "error", "4 digits needed.");
    setfocus(valfield);
    return false;
  } 

//  if (numdigits>10)
//    msg (infofield, "warn", numdigits + " digits - Are you sure?");
//  else { 
//    if (numdigits<10)
//      msg (infofield, "warn", "Only " + numdigits + " digits - Are you sure?");
//    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", "Age is not valid.");
    setfocus(valfield);
    return false;
  }

  if (tfld>=150) {
    msg (infofield, "error", "Age is not valid.");
    setfocus(valfield);
    return false;
  }

  if (tfld>110) msg (infofield, "warn", "Are you really that old, Gramps???");
  else {
    if (tfld<17) msg (infofield, "warn", "Bit young for this, aren't you?  Get permission from your folks first!");
    else        msg (infofield, "warn", "");
  }
  return true;
}