// ----------------------------------------------------------------------
// 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 );
}


// ----------------------------------------
// 			QueryString parsing
// ----------------------------------------

function QueryString(key)
{
	var value = null;
	for (var i=0;i<QueryString.keys.length;i++)
	{
		if (QueryString.keys[i]==key)
		{
			value = QueryString.values[i];
			break;
		}
	}
	return value;
}
QueryString.keys = new Array();
QueryString.values = new Array();

function QueryString_Parse()
{
	var query = window.location.search.substring(1);
	var pairs = query.split("&");
	
	for (var i=0;i<pairs.length;i++)
	{
		var pos = pairs[i].indexOf('=');
		if (pos >= 0)
		{
			var argname = pairs[i].substring(0,pos);
			var value = pairs[i].substring(pos+1);
			QueryString.keys[QueryString.keys.length] = argname;
			QueryString.values[QueryString.values.length] = value;		
		}
	}

}

QueryString_Parse();


// -----------------------------------------
//                  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 {
      msg (ifld, "info", "");   // 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, "info", "");  
  return true;
};


// -----------------------------------------
//               validateNumber
// Validate if numeric
// Returns true if so (and also if could not be executed because of old browser)
// -----------------------------------------

function validateNumber  (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 number = /^[0-9]+$/
  if (!number.test(tfld)) {
    msg (ifld, "error", "please use digits (0-9) only");
    setfocus(vfld);
    return false;
  }
  msg (ifld, "info", "");  
  return true;
};


// -----------------------------------------
//               validateMoney
// Validate if numeric
// Returns true if so (and also if could not be executed because of old browser)
// -----------------------------------------

function validateMoney  (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 money = /^[0-9]+(\.[0-9]{2})?$/
  if (!money.test(tfld)) {
    msg (ifld, "error", "please use format '000.00'");
    setfocus(vfld);
    return false;
  }
  msg (ifld, "info", "");  
  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 = /^[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/
  if (!email.test(tfld)) {
    msg (ifld, "error", "this is not a valid e-mail address");
    setfocus(vfld);
    return false;
  }
  msg (ifld, "info", "");  
  return true;
};


// -----------------------------------------
//               validatePC
// Validate if proper postal code
// Returns true if so (and also if could not be executed because of old browser)
// -----------------------------------------

function validatePC     (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]\d[A-Za-z]( |-)\d[A-Za-z]\d)$/
  if (!postalcode.test(tfld)) {
    msg (ifld, "error", "this is not a valid postal code");
    setfocus(vfld);
    return false;
  }
  msg (ifld, "info", "");  
  return true;
};


// -----------------------------------------
//            validatePhone
// 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 validatePhone  (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 = /^[(]?(\d{0,3})[)]?[\s.-]?(\d{3})[\s.-]?(\d{4})( x| ext)?[.]?[\s]?(\d*)?$/
  if (!telnr.test(tfld)) {
    msg (ifld, "error", "this is not a valid phone number");
    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", "this is not a valid phone number");
    setfocus(vfld);
    return false;
  }
  msg (ifld, "info", "");  
  return true;
};



// -----------------------------------------
//            countWords
// checks number of words in a text area
// -----------------------------------------
function countWords (vfld, maxnum)
{
   var msg = "";
   var c = 0;
   var er = 0;
   w = vfld.value.split(" ");
   no_words = w.length;
   for (x = 0; x < no_words; x++)
      {
      if (c >= (maxnum + 10))
         {
         alert(maxnum + " words or less, please!");
         vfld.value = msg;
         er = 1;
         break;
         }
      msg = msg + w[x] + " ";
      c++;
      }
   if (er)
      {
      return false;
      }
   return true;
}



// -----------------------------------------
//            resetField
// blanks a prefilled field on focus
// restores prefill on blur if nothing entered
// -----------------------------------------
function resetField( FIELD, RESET, inactiveColor ) {
  var vD = FIELD.defaultValue;
  if ( FIELD.value == ( RESET ? '' : vD ) ) FIELD.value = ( RESET ? vD : '' );
  FIELD.style.color = ( FIELD.value == vD ) ? inactiveColor : '';
}