// JPC: Used this script from web site
// http://www.xs4all.nl/~sbpoley/webmatters/formval.html
// Very useful, with some modifications
// All modfications are commented

// ----------------------------------------------------------------------
// 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).
// ----------------------------------------------------------------------




var nbsp = 160;    // non-breaking space char
var node_text = 3; // DOM text node-type
emptyString = /^\s*$/

// JPC - added this function for message boxes
// 

function checkLength(ifld, textAreaField, maxlength) {
	if (textAreaField.value.length > maxlength) {
		textAreaField.value = textAreaField.value.substring(0, maxlength);
	}
	msg (ifld, "warn", 'Characters Remaining: ' + (maxlength-textAreaField.value.length));
}
  
// -----------------------------------------
//                  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 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;

};

// -----------------------------------------
//            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");  
      vfld.focus();
      return false;
    }
    else {
      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;
};

// -----------------------------------------
//               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");
    vfld.focus();
    return false;
  }

  // JPC - remove this warning stuff, above check is good enough
  //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 - check if correct");
  //else
  //  msg (ifld, "warn", "");

  msg (ifld, "warn", "");
  return true;
};



// JPC - add new function to check credit card number
function validateCreditCardNum(vfld, ifld, reqd) {
  var stat = commonCheck(vfld, ifld, reqd);
  if (stat != proceed) return stat;
  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off

  var cardNum = /^[0-9]{15,16}$/
  if (!cardNum.test(tfld)) {
    msg(ifld, "error", "ERROR: Please enter a valid card number.  Do not enter the spaces.");
    vfld.focus();
    return false;
  }
  msg (ifld, "warn", "");
  return true;  
};

// JPC - add new function to check credit card expiry
function validateCreditExpiry(vfld, ifld, reqd) {
  var stat = commonCheck(vfld, ifld, reqd);
  if (stat != proceed) return stat;
  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off

  var expiryPattern = /^[0-1][0-9][0-1][0-9]$/
  if (!expiryPattern.test(tfld)) {
    msg(ifld, "error", "ERROR: Use expiry format MMYY.  For example, if your card has an expiry of 12/04, enter 1204");
    vfld.focus();
    return false;
  }
  msg (ifld, "warn", "");
  return true;
};

// JPC - add new function to check postal code 

function validatePostal (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 postalCode = /^[A-Za-z][0-9][A-Za-z][ -]?[0-9][A-Za-z][0-9]$/
  
  if (!postalCode.test(tfld)) {
     msg(ifld, "error", "ERROR: please enter a valid postal code (ie. A9A 9A9)");
     vfld.focus();
     return false;
  }
  msg (ifld, "warn", "");
  return true;
};

// JPC - add new function to check postal code / zip

function validatePostalZip (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 postalCode = /^[A-Za-z][0-9][A-Za-z][ -]?[0-9][A-Za-z][0-9]$/
  var zipCode = /(^[0-9]{5}$)|(^[0-9]{5}-[0-9]{4}$)/
  
  if (!postalCode.test(tfld)) {
    if (!zipCode.test(tfld)) {
       msg(ifld, "error", "ERROR: please enter a valid postal code (Canada) or zip code (U.S.A.)");
       vfld.focus();
       return false;
    }
  }
  msg (ifld, "warn", "");
  return true;
};

// JPC - add new function to check amounts
function validateAmount (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd,	// true if required
                         min,	// minimum value 
                         max)	// maximum value   
{
  var stat = commonCheck (vfld, ifld, reqd);
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off

  var amount =/^[\$]?[0-9]+[ \.]{0,1}[0-9]{0,2}$/
  
  if (!amount.test(tfld)) {
     msg(ifld, "error", "ERROR: please enter a valid amount (ie. 35.00)");
     vfld.focus();
     return false;
  }

  if (tfld < min || tfld > max) {
     msg(ifld, "error", "ERROR: amount must be between $"  + min + " and $" + max + ", for higher amounts please contact us");
     vfld.focus();
     return false;
  }
  msg (ifld, "warn", "");
  return true;
};


// JPC - change name of function to validatePhoneNumber (old: validateTelnr)
// -----------------------------------------
//            validatePhoneNumber
// 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 validatePhoneNumber  (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
  // JPC - added x as a valid character (for extentions)	
  var telnr = /^\+?[0-9 x()-]+[0-9]$/
  if (!telnr.test(tfld)) {
    // JPC - changed message
    msg (ifld, "error", "ERROR: Invalid phone number, Please use format (416) 555-5555");
    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++;

  // JPC - require 10 digits
  if (numdigits<10) {
    // JPC - changed message
    msg (ifld, "error", "ERROR: Please use format (416) 555-5555");
    vfld.focus();
    return false;
  }

  // JPC - removed warnings
  //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", "");
  //}

  msg (ifld, "warn", ""); 
  return true;
};


// JPC - removed validateAge() function , unused
//
// -----------------------------------------
//             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: not a valid age");
//    vfld.focus();
//    return false;
//  }
//
//  if (tfld>=200) {
//    msg (ifld, "error", "ERROR: not a valid age");
//    vfld.focus();
//    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;
//};