// ----------------------------------------------------------------------
// 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", "ERROR: Required field.");  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", "");   // 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;

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

function validatePostalCode (valfield,
                             infofield,
                             required)
{
  var stat = commonCheck (valfield, infofield, required);
  if (stat != proceed) return stat;
  
  var trimmed = trim(valfield.value);
  var postalCode = /^[0-9]{5}(-[0-9]{4})?$/ ;
  if (!postalCode.test(trimmed)) {
    msg (infofield, "error", "ERROR: Not a valid postal code, expecting (00000 or 00000-0000).");
    setfocus (valfield);
    return false;
  }
  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 = /^\(?[2-9]{1}[0-9]{2}[) -.]{0,2}[0-9]{3}[- .]?[0-9]{4}[ ]?((x|ext)[.]?[ ]?[0-9]{1,5})?$/ ;
  
  if (!telnr.test(tfld)) {
    msg (infofield, "error", "ERROR: Not a valid telephone number, expecting ((000) 000-0000 or 000-000-0000)");
    setfocus(valfield);
    return false;
  }
  else
  {
   msg (infofield, "warn", "");
  } 
  
/*
  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 
// modified 10 Feb 2007 [dan] - removed warning checks for age range.
// --------------------------------------------

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;
  }
  
  //all else is ok
  msg(infofield, "warn", "");
  return true;
  
}

//-------------------------------------------------------------------------
//
//  Tests password for minimum standards:
//  8-chars, 1 alpha, 1 numeric
function validatePassword(password, infofield, required)
{
  var stat = commonCheck(password, infofield, required);
  
  if (stat != proceed) return stat;
  
  var tfld = trim(password.value);
  var alpha = /[a-zA-Z]+/;
  var numeric = /[0-9]+/;
  //var special = /[\!\#\$\%\&\*\+\-\=\:\?\@\^\`\~\.]*/; //may use later
  
  if (tfld.length < 8) {
    msg (infofield, "error", "ERROR: Your password must be at least 8 characters.");
    setfocus(password);
    return false;
  }
  
  if (!alpha.test(tfld)){
    msg (infofield, "error", "ERROR: Your password must include at least 1 alphabet character.");
    setfocus(password);
    return false;
  }
  
  if (!numeric.test(tfld)){
    msg (infofield, "error", "ERROR: Your password must include at least 1 numeric character.");
    setfocus(password);
    return false;
  }
  
  //got this far, return true
  msg(infofield, "warn", "");
  return true;
}

function validateConfirm(confirm, password, infofield, required)
{
  var stat = commonCheck(confirm, infofield, required);
	if (stat != proceed) return stat;
	
	var field1 = trim(confirm.value);
	var field2 = trim(password.value);
	
	if (field1 != field2)
	{
		msg (infofield, "error", "ERROR: The two password fields do not match please try again.");
		confirm.value = '';
		password.value = '';
		setfocus(password);
		return false;
	}
	
	msg(infofield, "warn", "");
	return true;
	
}

//---------------------------------------------------
//
// Strips or replaces certain illegal characters from a string.

function replaceInvalidChars(value)
{

	try
	{
		var strip = new RegExp('\d=\d|-{2,}|/*|*/|\|{2}|%|@+\S+');
		var num = new RegExp('#');
		var plus = new RegExp('\+');
		
		var result = '';
		
		result = value.replace(strip, '');
		
		result = result.replace(num, 'No.');
		
		result = result.replace(plus, 'and');
		
		return result;
	}
	catch (err)
	{
		//just return the original value if anything goes wrong
		return value;
	}
		
}