// ----------------------------------------------------------------------
// 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
             clfld,		// id of element to change class
             msgtype, // class to give element 
             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;  
  
  var elemcl = document.getElementById(clfld);
  elemcl.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
                         infoclass,	// 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, infoclass, "error line clearfix", "ERROR: required");  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, infoclass, "line clearfix", "");   // 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
                         infoclass)	// id of element to receive info/error msg
{
  var stat = commonCheck (valfield, infofield, infoclass, true);
  if (stat != proceed) return stat;
  
  //	if (infoclass = 'clsubject') 
  //		msg (infofield, infoclass, "line blockend clearfix", "");
   
  	else 
  		msg (infofield, infoclass, "line clearfix", "");  
   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
                         infoclass,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, infoclass, 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, infoclass, "error line clearfix", "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, infoclass, "error line clearfix", "Unusual e-mail address - check if correct");
  else
    msg (infofield, infoclass, "line clearfix", "");
  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
                         infoclass,  // id of element to receive info/error msg
                         required)   // true if required
{
  var stat = commonCheck (valfield, infofield, infoclass, 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, infoclass, "error line clearfix", "ERROR: not a valid 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<3) {
    msg (infofield, infoclass, "error line clearfix", "ERROR: " + numdigits + " digits - too short");
    setfocus(valfield);
    return false;
  }

  if (numdigits>16)
    msg (infofield, infoclass, "error line clearfix", numdigits + " digits - check if correct");
  else { 
    if (numdigits<8)
      msg (infofield, infoclass, "error line clearfix", "Only " + numdigits + " digits - check if correct");
    else
      msg (infofield, infoclass, "line clearfix", "");
  }
  return true;
}


// --------------------------------------------
//            validateCountry
// Validate if country has been selected
// Returns true if so
// --------------------------------------------

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

  if (valfield.selectedIndex == 0) {
    msg (infofield, infoclass, "error line clearfix", "ERROR: no country selected");
    return false;
  }

  msg (infofield, infoclass, "line clearfix", "");  
  return true;
}

// --------------------------------------------
//            validateCaptcha
// --------------------------------------------

function validateCaptcha  (valfield,   // element to be validated
                         captresult,   // result of captchar
                         infofield,  // id of element to receive info/error msg
                         infoclass,  // id of element to receive info/error msg
                         required)   // true if required

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



	if (valfield.value > 0)
		{
			if (valfield.value != captresult)
				{
    			msg (infofield, infoclass, "error line blockend clearfix", "ERROR: The result entry does not match");
 //   			setfocus(valfield);
    			return false;
				}
		}
		
 	msg (infofield, infoclass, "line blockend clearfix", "");  
  	return true;


}



// --------------------------------------------
//            validateSoftware
// Validate if Software has been selected
// Returns true if so
// --------------------------------------------

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

  if (valfield.selectedIndex == 0) {
    msg (infofield, infoclass, "error line blockend clearfix", "ERROR: no software selected");
    return false;
  }

  msg (infofield, infoclass, "line blockend clearfix", "");  
  return true;
}



// --------------------------------------------
//            validateToMail
// Validate if Software has been selected
// Returns true if so
// --------------------------------------------

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

  if (valfield.selectedIndex == 0) {
    msg (infofield, infoclass, "error line blockend clearfix", "ERROR: no addressee selected");
    return false;
  }

  msg (infofield, infoclass, "line blockend clearfix", "");  
  return true;
}

// --------------------------------------------
//            validatePassword
// Validate if Password = RePassword
// Returns true if so
// --------------------------------------------

function validatePassword  (valfield,   // element to be validated
                         passfield,  // id of element to receive info/error msg
                         infofield,  // id of element to receive info/error msg
                         infoclass,  // id of element to receive info/error msg
                         required)   // true if required

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


	if (valfield.value > 0)
		{
			if (valfield.value != document.getElementById(passfield).value)
				{
    			msg (infofield, infoclass, "error line blockend clearfix", "ERROR: The passphrase entries do not match");
    			setfocus(valfield);
    			return false;
				}
		}
		
 	msg (infofield, infoclass, "line blockend clearfix", "");  
  	return true;


}



// --------------------------------------------
//            validateDongle
// Validate telephone number
// Returns true if so (and also if could not be executed because of old browser)
// 
// --------------------------------------------

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

  var dfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var donglenr = /\D/  ;
  if (donglenr.test(dfld)) {
    msg (infofield, infoclass, "error line clearfix", "ERROR: not a valid number. Characters permitted are digits only");
    setfocus(valfield);
    return false;
  }

  var numdigits = dfld.length;

  if (numdigits>5) {
    msg (infofield, infoclass, "error line clearfix", "ERROR: " + numdigits + " digits - too long");
	setfocus(valfield); }
  else {
	if (numdigits<3) {
      msg (infofield, infoclass, "error line clearfix", "Only " + numdigits + " digits - too short");
	  setfocus(valfield); }
    else {
      msg (infofield, infoclass, "line clearfix", "");
	  return true; }
  }
  return false;
}