// ----------------------------------------------------------------------
// 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.
// ----------------------------------------------------------------------

emptyString = /^\s*$/

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

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


// -----------------------------------------
//                  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 slip in an nbsp if needed
  var dispmessage;
  if (emptyString.test(message)) 
	dispmessage = " ";    
  else  
	dispmessage = message;

  var elem = document.getElementById(fld);
  if (elem.firstChild && (elem.firstChild.nodeType == 1))
	elem.firstChild.nodeValue = dispmessage;  // DOM method
  else 
	elem.innerHTML = dispmessage; // IE/Opera method
  
  elem.className = msgtype;
};

// -----------------------------------------
//            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    (vfld,   // element to be validated
						 ifld,   // id of element to receive info/error msg
						 reqd)   // true if required
{
  if (!document.getElementById) 
	return true;  // not available on this browser - leave validation to the server
  var elem = document.getElementById(ifld);
  if (!elem.firstChild && (typeof elem.innerHTML != "string"))
	return true;  // not available on this browser 

  if (emptyString.test(vfld.value)) {
	if (reqd) {
	  msg (ifld, "error", " Required");  
	  vfld.focus();
	  return false;
	}
	else {
	  msg (ifld, "info", "");   // OK
	  return true;  
	}
  }
  return proceed;
}

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

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

  msg (ifld, "info", "");  
  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  (vfld,   // element to be validated
						 ifld,   // id of element to receive info/error msg
						 reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

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

  var email2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/
  if (!email2.test(tfld)) 
	msg (ifld, "warn", " Unusual - check if correct");
  else
	msg (ifld, "info", "");
  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  (vfld,   // element to be validated
						 ifld,   // id of element to receive info/error msg
						 reqd)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-.]+[0-9]$/
  if (!telnr.test(tfld)) {
	msg (ifld, "error", " Digits, spaces or ( ) - . only");
	vfld.focus();
	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 (ifld, "error", " "+numdigits + " digits - too short");
	vfld.focus();
	return false;
  }

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


// -------------------------------------------------
//                   validateSelected
//                       added by J. Ferry
//Validate a radio form element to see if a selection was made
//Returns True if OK
// ------------------------------------------------
function validateSelected(vfld,		// element to be checked
							ifld) //id of element to recieve info/error msg
{
	var stat = commonCheck (vfld, ifld, true);
	if (stat != proceed) return stat;
	for(i=0; i< vfld.length;i++)
	{
		if(vfld[i].checked )
		{
			msg(ifld, "info", "");
			return true;
		}
	}

	msg(ifld, "error", " No selection made");
	return false;
};

// -------------------------------------------------
//                   validateChecked
//                       added by J. Ferry
//Validate a checkbox element to see if it is checked
//Returns True if OK
// ------------------------------------------------
function validateChecked(vfld,		// element to be checked
							ifld) //id of element to recieve info/error msg
{
	//var stat = commonCheck (vfld, ifld, true);
	//if (stat != proceed) return stat;
	if(vfld.checked==true)
		{
			msg(ifld, "info", "");
			return true;
		}

	msg(ifld, "error", " - You must agree to the Terms of Service");
	return false;
};