// ----------------------------------------------------------------------
// 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*$/

// -----------------------------------------
//                  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", " 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;
  }

  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", "");
  return true;
};

// validate Measure
function validateMeasure(vfld, ifld, reqd) {
	var stat = commonCheck(vfld, ifld, reqd);
	if (stat != proceed) return stat;
	var tfld = trim(vfld.value);
	var measureRE = /(^\d+\s*('|feet|foot|ft(\.)?))((\s?\d+\s?("|inch(es)?|in(\.)?))?)$|^\d+\s?("|inch(es)?|in(\.))$/gm
	//var measureRE = /(((\d+\s?(feet|foot|')))+(\s?\d+\s*(inch(es)?|"|in\.|in))*)+$/;
	if (!measureRE.test(tfld)) {
		msg(ifld, "error", "ERROR: not a valid measurement. Use format 5 feet 6 inches or 5' 6\"")
		vfld.focus();
		return false;
	}
	msg(ifld, "warn", "")
	formatMeasure(vfld, tfld)
	return true;
} //End validateMeasure
// Format Measure
 function formatMeasure(ffld, val){
 	var footRE = /\s*(foot|feet|ft(\.)$)/i;
	var inchRE = /\s*(inch(es)?|in(\.)$)/i;
	val = val.replace(footRE,"'");
	val = val.replace(inchRE,"\"");
	ffld.value = val;
 }
// -----------------------------------------
//            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: not a valid telephone number. Characters permitted are digits, space ()- and leading +");
    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++;

  if (numdigits<6) {
    msg (ifld, "error", "ERROR: " + numdigits + " digits - too short");
    vfld.focus();
    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;
}
// Validate Checkboxes are selected
	function validateContactMeth(ifld,farray) {
		var checkGrp = farray.split(",");
		var gFlagContactMeth = false;
		
		for(var grp=0;grp<checkGrp.length;grp++){
			// alert(eval("document.forms[0].elements['"+checkGrp[grp]+"'].value"));
			if (eval("document.forms[0].elements['"+checkGrp[grp]+"'].checked"))
				gFlagContactMeth=true;
		}
	if(!gFlagContactMeth){
		msg(ifld,"error","You must specify a contact method");
		return false;
	}
	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: 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;
}

// Validate Select box
	function validateSelect(vfld, ifld){
		if (vfld.selectedIndex==0){
		msg(ifld, "error", " Please make a selection.");
		return false;}
		else {
		msg(ifld, "warn", "");
			return true;
		}
		}

// Validate Number
	function validateNumber(vfld, ifld, reqd) {
		  var stat = commonCheck (vfld, ifld, reqd);
		  if (stat != proceed) return stat;
		  var numberRE = /(^\d*\.?\d*[1-9]+\d*$)|(^[1-9]+\d*\.\d*$)/;
		  var tfld = trim(vfld.value);
		  if (!numberRE.test(tfld)){
					msg(ifld, "error", "Not a valid Number");
					vfld.focus();
					return false;
					}
		msg(ifld, "warn", "");
		vfld.focus();
		return true;
	}
	// Validate Number Range
	function validateNumRange (vfld, ifld, minval, maxval, reqd) {
		 var stat = commonCheck (vfld, ifld, reqd);
		 if (stat != proceed) return stat;
		 var numberRE = /(^\d*\.?\d*[1-9]+\d*$)|(^[1-9]+\d*\.\d*$)/;
		 var tfld = trim(vfld.value);
		 
		 if (!numberRE.test(tfld)) {
			msg(ifld, "error", "Not a valid number");
			vfld.focus();
			return false;
			}
			if (!tfld <= maxval && tfld >= maxval){
				msg(ifld, "error", "Value must be between " + minval + " and " + maxval);
				vfld.focus();
				return false;
			}
		msg(ifld, "warn", "");
		vfld.focus();
		return true;
	}
	
	// Validate Year
		function validateYear(vfld, ifld, reqd){
		var stat = commonCheck (vfld, ifld, reqd);
		if (stat != proceed) return stat;
		var thisDate = new Date();
		var thisYear = thisDate.getFullYear();
		var yearRE = /(19)|(20)\d\d/;
		var tfld = trim(vfld.value);
		if(!yearRE.test(tfld)){
			msg(ifld, "error", " Not a valid Year");
			vfld.focus();
			return false;
			}
		if(parseInt(tfld)>parseInt(thisYear)+1){
			msg(ifld, "error", " Year is to far in the future");
			vfld.focus();
			return false;
			}
		msg(ifld, "warn", "")
		return true;
		}
		
	// Validate Weight
		function validateWeight(vfld, ifld, reqd){
		var stat = commonCheck (vfld, ifld, reqd);
		if (stat != proceed) return stat;
		var tfld = trim(vfld.value);
		var decimalRE = /(^\d*\.?\d*[1-9]+\d*$)|(^[1-9]+\d*\.\d*$)/;
		if(!decimalRE.test(tfld)){
			msg(ifld, "error", "Not a valid number. Please enter in TONS");
			vfld.focus();
			return false;
			}
		msg (ifld, "warn", "");
		return true;
		}

// JavaScript Document