// ----------------------------------------------------------------------
// Brandon Peterson
//  July 18, 2007
// Caveat:  Coded for IE 6+.  Old browsers will  return true and validation 
// must rely on server.
// ----------------------------------------------------------------------

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 workaround for 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 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    (valfield,   // element to be validated
                         infofield,  // 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, "error", "required");  
      setfocus(valfield);
      return false;
    }
    else {
      msg (infofield, "warn", "");   // 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
{
  var stat = commonCheck (valfield, infofield, true);
  if (stat != proceed) return stat;

  msg (infofield, "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   (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;

  var val = trim(valfield.value);  // value of field with whitespace trimmed off
  var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/  ;
  if (!emailFilter.test(val)) {
    msg (infofield, "error", "not a valid e-mail address");
    setfocus(valfield);
    return false;
  }

  var emailFilter2 = /^[A-Za-z][\w.-]+@\w[\w.-]+\.[\w.-]*[A-Za-z][A-Za-z]$/  ;
  if (!emailFilter2.test(val)) 
    msg (infofield, "warn", "unusual e-mail address");
  else
    msg (infofield, "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  (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;

  var val = trim(valfield.value);  // value of field with whitespace trimmed off
  var telnr = /^\+?[0-9 ()-]+[0-9]$/  ;
  if (!telnr.test(val)) {
    msg (infofield, "error", "characters permitted are digits, space ()- and leading +");
    setfocus(valfield);
    return false;
  }

  var numdigits = 0;
  for (var j=0; j<val.length; j++)
    if (val.charAt(j)>='0' && val.charAt(j)<='9') numdigits++;

  if (numdigits<6) {
    msg (infofield, "error", "" +numdigits + " digits - too short");
    setfocus(valfield);
    return false;
  }

  if (numdigits>14)
    msg (infofield, "warn", numdigits + " digits: please check");
  else { 
    if (numdigits<10)
      msg (infofield, "warn", "Only " + numdigits + " digits: please check");
    else
      msg (infofield, "warn", "");
  }
  return true;
}

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

function validateAge    (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;

  var val = trim(valfield.value);
  var ageRE = /^[0-9]{1,3}$/
  if (!ageRE.test(val)) {
    msg (infofield, "error", "not a valid age");
    setfocus(valfield);
    return false;
  }

  if (val>=125) {
    msg (infofield, "error", "not a valid age");
    setfocus(valfield);
    return false;
  }

  if (val>100) msg (infofield, "warn", "Older than 100: please check");
  else {
    if (val<21) msg (infofield, "warn", "You are too young to be on this site.");
    else        msg (infofield, "warn", "");
  }
  return true;
}

// --------------------------------------------
//               validateFirstName
// Validate if first name is entered
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateFirstName  (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;

  var val = trim(valfield.value);  // value of field with whitespace trimmed off
  
  if (val.length == 0) {
    msg (infofield, "error", "please enter your first name.");
    setfocus(valfield);
    return false;
  }
  else
    msg (infofield, "warn", "");
  return true;
}

// --------------------------------------------
//               validateLastName
// Validate if last name is entered
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateLastName  (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;

  var val = trim(valfield.value);  // value of field with whitespace trimmed off
  
  if (val.length == 0) {
    msg (infofield, "error", "please enter your last name.");
    setfocus(valfield);
    return false;
  }
  else
    msg (infofield, "warn", "");
  return true;
}

// --------------------------------------------
//               validateUserComments
// Validate if comments are  entered
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateUserComments  (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;

  var val = trim(valfield.value);  // value of field with whitespace trimmed off
  
  if (val.length == 0) {
    msg (infofield, "error", "please enter your comments");
    setfocus(valfield);
    return false;
  }
  else
    msg (infofield, "warn", "");
  return true;
}

// --------------------------------------------
//               validateUPC
// Validate if upc is entered and 10 digits.
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateUPC  (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;

  var val = trim(valfield.value);  // value of field with whitespace trimmed off
  
  if (val.length == 0) {
    msg (infofield, "error", "please enter the 10 digit UPC code from your wine bottle");
    setfocus(valfield);
    return false;
  }
  else if ( (val.length > 10) || (val.length < 10) ) {
    msg (infofield, "error", "please enter exactly 10 digits for your UPC code");
    setfocus(valfield);
    return false;
  }
  else
    msg (infofield, "warn", "");
  return true;
}

// --------------------------------------------
//               validateSize
// Validate if size is entered
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateSize  (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;

  var val = trim(valfield.value);  // value of field with whitespace trimmed off
  
  if (val.length == 0) {
    msg (infofield, "error", "please enter the size of your bottle");
    setfocus(valfield);
    return false;
  }
  else
    msg (infofield, "warn", "");
  return true;
}

// --------------------------------------------
//               validateVarietal
// Validate if varietal is entered
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateVarietal  (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;

  var val = trim(valfield.value);  // value of field with whitespace trimmed off
  
  if (val.length == 0) {
    msg (infofield, "error", "please enter the varietal of your bottle");
    setfocus(valfield);
    return false;
  }
  else
    msg (infofield, "warn", "");
  return true;
}

// --------------------------------------------
//               validateProdCode
// Validate if production code is entered
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function validateProdCode  (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;

  var val = trim(valfield.value);  // value of field with whitespace trimmed off
  
  if (val.length == 0) {
    msg (infofield, "error", "please enter the production code of your bottle.");
    setfocus(valfield);
    return false;
  }
  else
    msg (infofield, "warn", "");
  return true;
}

// --------------------------------------------
//               compareEmails
// Validate if production code is entered
// Returns true if so (and also if could not be executed because of old browser)
// --------------------------------------------

function compareEmails(valfield,   // confirmation email address
		       valfield2,  //original email address
                       infofield,  // id of element to receive info/error msg
                       required)   // true if required
{
  var stat = commonCheck (valfield, infofield, required);
  var stat2 = commonCheck (valfield2, infofield, required);
  if (stat != proceed) return stat;
  
  var val = trim(valfield.value);  // value of fields with whitespace trimmed off
  var val2 = trim(document.getElementById(valfield2).value); //value of original email with whitespace trimmed off 
 
  var str1 = new String(val); //reference vars as strings respectfully
  var str2 = new String(val2);
  
  if (str1.toString() != str2.toString()) {
    msg (infofield, "error", "the email addresses do not match");
    setfocus(valfield);
    return false;
  }
  else
    msg (infofield, "warn", "");
  return true;
}