// ----------------------------------------------------------------------
// Javascript form validation routines.
// Author: Stephen Poley
// ----------------------------------------------------------------------

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 elem = document.getElementById(fld);
  
  if (emptyString.test(message)){ 
    elem.style.color = msgtype;
  }
  else {  
      elem.style.color = msgtype; 
      elem.firstChild.nodeValue = message; 
  }
}

// --------------------------------------------
//            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 (emptyString.test(valfield.value)) {
	  msg (infofield, "red", "");
	  setfocus(valfield);
	  return false;
  }
   else {
      msg (infofield, "black", ""); 
	  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;
  
  if (emptyString.test(valfield.value)) {
    msg (infofield, "red", "E-mail");
    setfocus(valfield);
    return false;
  }

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var email = /^[^@]+@[^@.]+\.[^@]*\w\w$/  ;
  if (!email.test(tfld)) {
    msg (infofield, "red", "E-mail (invalid e-mail format)");
    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, "brown", "E-mail (e-mail format warning)");
  else
    msg (infofield, "black", "E-mail");
  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;
 
   if (emptyString.test(valfield.value)) {
    msg (infofield, "red", "Phone");
    setfocus(valfield);
    return false;
  }

  var tfld = trim(valfield.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-].+[0-9]$/  ;
  if (!telnr.test(tfld)) {
    msg (infofield, "red", "Phone (invalid characters)");
    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, "red", "Phone (invalid length)");
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
    msg (infofield, "brown", "Phone (warning-long number)");
  else { 
    if (numdigits<9)
      msg (infofield, "brown", "Phone (please include area code)");
    else
      msg (infofield, "black", "Phone");
  }
  return true;
}