// ----------------------------------------------------------------------
// 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

function resetmsg(errorDiv) {
	var elem = document.getElementById(errorDiv);
	elem.innerHTML = " ";	
	elem.className= "";
}
function closemsg() {}

// -----------------------------------------
//                  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);
		
		if(msgtype == "error") {
			//alert(fld + " " + elem.innerHTML +  " " + dispmessage);
			if(elem.innerHTML == "Required") {
				addFormElem(fld, "", "", "", "", "", "span", dispmessage); 
			}else {
				if((elem.innerHTML == " ")||(elem.innerHTML == "")) {
					addFormElem(fld, "", "", "", "", "", "h3", "There were errors in your submission:");  
					addFormElem(fld, "errorsFound", "", "", "", "", "ul"); 
				}
					addFormElem("errorsFound", "", "", "", "", "", "li", dispmessage); 
			}
			
			//alert("new innerHTML: " + elem.innerHTML);
			
			elem.className = "errorsFound";   // 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
						 fieldName)
{
  if (!document.getElementById) {
  //alert("not available on this browser - can't getElementById");
    return true;  // not available on this browser - leave validation to the server
  }
  var elem = document.getElementById(ifld);
  if (!elem.firstChild) {
    //alert("not available on this browser - can't get firstchild");
    return true;  // not available on this browser 
  }
  if (elem.firstChild.nodeType != node_text) {
    //alert("ifld is wrong type of node");
    return true;  // ifld is wrong type of node  
  }
  if (emptyString.test(vfld.value)) {
    if (reqd) {
      msg (ifld, "error", "Please enter your " + fieldName);  
      setfocus(vfld);
      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
						 fieldName)
{
  var stat = commonCheck (vfld, ifld, true, fieldName);
  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
						 fieldName)
{
  var stat = commonCheck (vfld, ifld, reqd, fieldName);
  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", fieldName + " 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 - check if correct");
  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, fieldname)   // true if required
{
  var stat = commonCheck (vfld, ifld, reqd, fieldname);
  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 +");
    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;
};
// -----------------------------------------
//            validateNumber
// Validate valid number
// -----------------------------------------

function validateNumber  (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd, fieldname)   // true if required
{
	
	//alert("validating number: " + vfld);
	
  var stat = commonCheck (vfld, ifld, reqd, fieldname);
  
  //alert(stat);
  
  if (stat != proceed) return stat;

  var tfld = trim(vfld.value);  // value of field with whitespace trimmed off
  var telnr = /^\d+$/
  if (!telnr.test(tfld)) {
    msg (ifld, "error", "ERROR: not a valid number. ");
    setfocus(vfld);
    return false;
  }
  return true;
};

// -----------------------------------------
//            validateDropdown
// -----------------------------------------

function validateDropdown  (vfld,   // element to be validated
                         ifld,   // id of element to receive info/error msg
                         reqd, fieldName)   // true if required
{
	var stat = commonCheck (vfld, ifld, reqd, fieldName);
	if (stat != proceed) return stat;

	if ((vfld.value == 0) || (vfld.value == "")) {
    	msg (ifld, "error", "ERROR: Please select at least one option. ");
    	setfocus(vfld);
 		return false;
	}else {
   		msg (ifld, "warn", "");
	 	return true;
	}
};

// -----------------------------------------
//            validateCheckBoxes
// -----------------------------------------

function validateCheckBoxes (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;

	if ((vfld.value == 0) || (vfld.value == "")) {
    	msg (ifld, "error", "ERROR: Please select at least one option. ");
    	setfocus(vfld);
 		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");
    setfocus(vfld);
    return false;
  }

  if (tfld>=200) {
    msg (ifld, "error", "ERROR: 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 validatePassmatch(first, second, ifld) {
	//alert(first.value + second.value);
	if(first.value.match("^" + second.value + "$")) {
		return true;
	}else {
   	 msg (ifld, "error", "ERROR: password1 and password2 must match");
    setfocus(first);
		return false;
	}
}



function isDate(dateStr) {
	//alert("CHECKING: " + dateStr);
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;
	var matchArray = dateStr.match(datePat); // is the format ok?
	if (matchArray == null) {
		//alert("Please enter date as either mm/dd/yyyy or mm-dd-yyyy.");
		return false;
	}
	month = matchArray[3]; // p@rse date into variables
	day = matchArray[1];
	year = matchArray[5];
	if (month < 1 || month > 12) { // check month range
		//alert("Month:" + month + " must be between 1 and 12.");
		return false;
	}
	if (day < 1 || day > 31) {
		//alert("Day must be between 1 and 31.");
		return false;
	}
	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
		//alert("Month "+month+" doesn`t have 31 days!")
		return false;
	}
	if (month == 2) { // check for february 29th
		var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
		if (day > 29 || (day==29 && !isleap)) {
			//alert("February " + year + " doesn`t have " + day + " days!");
			return false;
		}
	}
	return true; // date is valid
}


//return date object
function validateDate(day, month, year, inPastOkay, ifld, required) {
	if((required)||((day.value != "")||(month.value != "")||(year.value != ""))) {
		var passedDay = day.value;
		var passedMonth = month.value;
		var passedYear = year.value;
		//alert("validating date");
		var dateString =passedDay + "/" + passedMonth + "/" +  passedYear;
		if(isDate(dateString)) {
			var today = new Date();
			var passedDate = new Date();
			passedDate.setFullYear(passedYear, passedMonth, passedDay);
			
			if(!inPastOkay &&(today > passedDate)) {
				msg (ifld, "error", "ERROR: date entered has already passed!");
				return false;
			}
			return true;
		}else {
			msg (ifld, "error", "ERROR: please enter a valid date");
			return false;	
		}
	}else {
		return true;	
	}
}