// ----------------------------------------------------------------------
// 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 Aug 2004: have tested that IE 5.0 and IE 5.5 both support DOM model
// sufficiently well, so innerHTML option removed (redundant).
//
// 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.
// ----------------------------------------------------------------------

var nbsp = 160;    // non-breaking space char
var node_text = 3; // DOM text node-type
var emptyString = /^\s*$/
var glb_vfld;      // retain vfld 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(vfld)
{
  glb_vfld.focus()
}

function setfocus(vfld)
{
  glb_vfld = vfld;
  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    (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)
    return true;  // not available on this browser 
  if (elem.firstChild.nodeType != node_text)
    return true;  // ifld is wrong type of node  
  
  if (emptyString.test(vfld.value)) {
    if (reqd) {
      msg (ifld, "error", "required");  
      setfocus(vfld);
      return false;
    }
    else {
	  //alert(vfld.value);
      msg (ifld, "warn", "");   // 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, "warn", "");  
  return true;
};



function checkCountryUSA(vfld,ifld){
	if ((vfld.name=='country')&&(vfld.value=='United States')){
		return true;
	} else if ((vfld.name=='country')&&(vfld.value=="")){
		return true;
	} else { return false; }
}
// -----------------------------------------
//            validatePositive
// Validate if something has been entered
// That is a number greater than zero
// Returns true if so 
// -----------------------------------------

function validatePositive(vfld,   // element to be validated
                         ifld )  // id of element to receive info/error msg
{
  var stat = commonCheck (vfld, ifld, true);
  
  if (vfld > 0) {
  		return true;
	} else {
		msg (ifld, "error", "Error: This field is required.".vfld);
		return false;
	}
};

// -----------------------------------------
//               validateVerifyMatch
// Validate if the spam verify word is correct
// Returns true if so (and also if could not be executed because of old browser)
// -----------------------------------------

function validateVerifyMatch	(vfld,   // element1 to be validated
							vfld2,	// element2 to be validated
							ifld   // id of element to receive info/error msg
							)  
{
  //var stat = commonCheck (vfld, vfld2, ifld);
  //if (stat != proceed) return stat;
	var strng1 = vfld.value;
	var strng2 = vfld2.value;

  if (strng1.toLowerCase()!='2tkf4g') {
    msg (ifld, "error", "Error: Anti-Spam verification not completed.");
    setfocus(vfld);
    return false;
  } else if (strng1==""){
  	msg (ifld, "error", "Error: You must enter the Anti-Spam verification word.");
    setfocus(vfld);
    return false;
	}

  return true;
};


// -----------------------------------------
//               validateEmailMatch
// Validate if e-mail addresses match each other
// Returns true if so (and also if could not be executed because of old browser)
// -----------------------------------------

function validateEmailMatch	(vfld,   // element1 to be validated
							vfld2,	// element2 to be validated
							ifld   // id of element to receive info/error msg
							)  
{
  //var stat = commonCheck (vfld, vfld2, ifld);
  //if (stat != proceed) return stat;
	var strng1 = vfld.value;
	var strng2 = vfld2.value;

  if (strng1!=strng2) {
    msg (ifld, "error", "Error: E-mail addresses do not match each other.");
    setfocus(vfld);
    return false;
  } else if (strng1==""){
  	msg (ifld, "error", "Error: You must enter an E-mail address.");
    setfocus(vfld);
    return false;
	}

  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", "Error: Not a valid e-mail address");
    setfocus(vfld);
    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 e-mail address - Please re-check to verify.");
  else
    msg (ifld, "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  (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", "ERROR: The telephone number you entered is not valid. Characters permitted are digits, space ()- and leading +");
    setfocus(vfld);
    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", "ERROR: " + numdigits + " digits - too short");
    setfocus(vfld);
    return false;
  }

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

// -----------------------------------------
//             validateAge
// Validate person's age
// Returns true if OK 
// -----------------------------------------

function validateAge    (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);
  var ageRE = /^[0-9]{1,3}$/
  if (!ageRE.test(tfld)) {
    msg (ifld, "error", "ERROR: The age you entered is not a valid age");
    setfocus(vfld);
    return false;
  }

  if (tfld>=200) {
    msg (ifld, "error", "ERROR: The age you entered is not a valid age");
    setfocus(vfld);
    return false;
  }

  if (tfld>110) msg (ifld, "warn", "Older than 110: check correct");
  else {
    if (tfld<7) msg (ifld, "warn", "Bit young for this, aren't you?");
    else        msg (ifld, "warn", "");
  }
  return true;
};

function validatePassword (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 strng = vfld.value;
	//alert(strng);
	if (strng == "") 
	{
   		msg (ifld, "error", "Error: You didn't enter a password.\n");
		setfocus(vfld);
   		return false;
	}

    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if (strng.length < 6) {
       msg (ifld, "error", "Error: The password is the wrong length.");
	   setfocus(vfld);
	   return false;
    }
    else if (illegalChars.test(strng)) {
      msg (ifld, "error", "Error: The password contains illegal characters.");
	  setfocus(vfld);
	  return false;
    } else {
		 msg (ifld, "warn", "");
	}
    //else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/)))) {
    //   msg (ifld, "error", "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.");
	//return false;
	//}  
	return true;
}