// JavaScript Document

	// This file contains the data validation JavaScript functions
	// It is included in the HTML pages with forms that need these
	// data validation routines.
// DEFINE VARIABLES

// whitespace characters
var whitespace = " \t\n\r";

/****************************************************************/

// PURPOSE:  Check to see if the string passed in is a valid time.
//	A valid time is defined as a string which is postfixed with either
//  "PM" or "AM".  Next it checks to see if there is a colon in the
//  string.  If there is, it makes sure that at least one digit preceeds
//  it and two proceed it.

	function IsTime(strTime)
	{
		var strTestTime = new String(strTime);
		strTestTime.toUpperCase();

		var bolTime = false;

		if (strTestTime.indexOf("PM",1) != -1 || strTestTime.indexOf("AM",1))
			bolTime = true;

		if (bolTime && strTestTime.indexOf(":",0) == 0)
			bolTime = false;

		var nColonPlace = strTestTime.indexOf(":",1);
		if (bolTime && ((parseInt(nColonPlace) + 5) < (strTestTime.length - 1) || (parseInt(nColonPlace) + 4) > (strTestTime.length - 1)))
			bolTime = false;


		return bolTime;
	}

/****************************************************************/

function replaceAll (s, fromStr, toStr)
{
	var new_s = s;
	for (i = 0; i < 100 && new_s.indexOf (fromStr) != -1; i++)
	{
		new_s = new_s.replace (fromStr, toStr);
	}
	return new_s;
}

/****************************************************************/

/* PURPOSE:  Since we are using the single tick mark as the
	string delimiter to construct our SQL queries, a string with
	a tick mark in it will cause a SQL error.  Therefore we replace
	all "'" with "''", which eliminates the possibility of a SQL error.
*/

function sqlSafe (s)
{
	var new_s = s;
	new_s = replaceAll (new_s, "'", "|");
	new_s = replaceAll (new_s, "|", "''");
	new_s = replaceAll (new_s, "\"", "|");
	new_s = replaceAll (new_s, "|", "''");
	return new_s;
}

/****************************************************************/

function makeSafe (i)
{
	i.value = sqlSafe (i.value);
}

/****************************************************************/

// Check whether string s is empty.

function isEmpty(s)
{   return ((s == null) || (s.length == 0))
}

/****************************************************************/

// Returns true if string s is empty or 
// whitespace characters only.

function isWhitespace (s)

{   var i;

    // Is s empty?
    if (isEmpty(s)) return true;

    // Search through string's characters one by one
    // until we find a non-whitespace character.
    // When we do, return false; if we don't, return true.

    for (i = 0; i < s.length; i++)
    {   
	// Check that current character isn't whitespace.
	var c = s.charAt(i);

	if (whitespace.indexOf(c) == -1) return false;
    }

    // All characters are whitespace.
    return true;
}

/****************************************************************/

// isEmail (STRING s [, BOOLEAN emptyOK])
// 
// Email address must be of form a@b.c ... in other words:
// * there must be at least one character before the @
// * there must be at least one character before and after the .
// * the characters @ and . are both required
//
// For explanation of optional argument emptyOK,
// see comments of function isInteger.

function isEmail (objField)
{   
    // there must be >= 1 character before @, so we
    // start looking at character position 1 
    // (i.e. second character)
    var i = 1;
	var strField = new String(objField.value);
    var sLength = strField.length;

	
    // look for @
    while ((i < sLength) && (strField.charAt(i) != "@"))
    { i++
    }

    if ((i >= sLength) || (strField.charAt(i) != "@")) return false;
    else i += 2;

    // look for .
    while ((i < sLength) && (strField.charAt(i) != "."))

    { i++
    }

    // there must be at least one character after the .
    if ((i >= sLength - 1) || (strField.charAt(i) != ".")) return false;
    else return true;
}

/****************************************************************/

// Checks to see if a required field is blank.  If it is, a warning
// message is displayed...

function ForceEntry(objField)
{
	var strField = new String(objField.value);
	if (isWhitespace(strField)) {
		return false
	}
	return true;
}
		
/****************************************************************/

// Returns true if the string passed in is a valid number
//  (no alpha characters), else it displays an error message

function ForceNumber(objField)
{
	var strField = new String(objField.value);
	
	if (isWhitespace(strField)) return true;

	var i = 0;

	for (i = 0; i < strField.length; i++)
		if (strField.charAt(i) < '0' || strField.charAt(i) > '9') {
			return false;
		}

	return true;
}

/****************************************************************/

// Returns true if the string passed in is a valid money
//  (no alpha characters except a decimal place), 
//   else it displays an error message

function ForceMoney(objField)
{
	var strField = new String(objField.value);
	
	if (isWhitespace(strField)) return true;

	var i = 0;

	for (i = 0; i < strField.length; i++)
		if ((strField.charAt(i) < '0' || strField.charAt(i) > '9') && (strField.charAt(i) != '.')) {
			return false;
		}

	return true;
}


/****************************************************************/

// Right trims the string...  Useful for SQL datatypes of CHAR

function RTrim(strTrim)
{
	var str = new String(strTrim);
	var i = 0;
	var c = "";
	var endpos = 0

	for (i = str.length; i >= 0 && endpos == 0; i = i - 1) {
		c = str.charAt(i);
		if (whitespace.indexOf(c) == -1)
			endpos = i;
	}

	return str.substring(0,endpos+1);
}

/****************************************************************/

/* PURPOSE:  Returns true if the string is a valid date number.
	A method is passed in (1 = month, 2 = day).  If the string is
	nonnumeric, false is passed back.  If the day in the date string
	is greater than 31, false is returned.  If the month is greater
	than 12, an error is returned.
*/

function isDateNumber(strNum,method)
{
	var str = new String(strNum);
	var i = 0;

	if (isNaN(parseInt(str)) || parseInt(str) < 0) return false;

	if (method == 2)
		if (parseInt(str) > 31)
			return false;
	if (method == 1)
		if (parseInt(str) > 12)
			return false;

	for (i = 0; i < str.length; i++)
		if (str.charAt(i) < '0' || str.charAt(i) > '9')
			return false;


	return true;
}

/****************************************************************/

// Displays an alert box with the passed in string...

function PromptErrorMsg(Field,strError)
{
	alert("You have entered an invalid date for " + strError + ".  Please make sure your date format is in M/D/Y format.");
	Field.focus();
}

/****************************************************************/

// Checks for the following valid date formats:
// YYYY-MM-DD
// Also separates date into month, day, and year variables
// valid for sql date

function isValidDate(dateField) {

//2 digit year entry pattern
//var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;
var strField = new String(dateField.value);

// To require a 4 digit year entry, use this line instead:
var datePat = /^(\d{4})(-)(\d{1,2})(-)(\d{1,2})$/;

var matchArray = strField.match(datePat); // is the format ok?
if (matchArray == null) {
return false;
}
day = matchArray[5]; // parse date into variables
month = matchArray[3];
year = matchArray[1];

if (month < 1 || month > 12) { // check month range
return false;
}
if (day < 1 || day > 31) {
return false;
}
if ((month==4 || month==6 || month==9 || month==11) && day==31) {
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)) {
return false;
   }
}
return true;  // date is valid
}

/****************************************************************/

// This function determines if the string passed in is a valid
// Post code in the following format, lldd dll.
//l = letter, d = digit

function isPostcode(objField)
{
	var strField = new String(objField.value);
	// To require a 4 digit year entry, use this line instead:
	var postcodePat = /^(\d{4})(\d{1,2})(\d{1,2})$/;

	var matchArray = strField.match(postcodePat); // is the format ok?
	
	if (matchArray == null) {
	return false;
	}
	else 
	{
	return true;
	}
}

/****************************************************************/

// This function determines if the string passed in is a valid
// US zip code.  It accepts either ##### or #####-####.  If the
// string is valid, it returns true, else false.

function isZipcode(strZip)
{
	var s = new String(strZip);

	if (s.length != 5 && s.length != 10)
		// inappropriate length
		return false;


	for (var i=0; i < s.length; i++)
		if ((s.charAt(i) < '0' || s.charAt(s) > '9') && s.charAt(i) != '-')
			return false;

	return true;
}

/****************************************************************/

// This function ensures that a field is less than or equal to the
// Length passed in.  You must call this function with the element
// name in your form (for example: "ForceLength(document.forms[0].txtElement)"
// as opposed to "ForceLength(document.forms[0].txtElement.value)"
// If the field's value is too large, an error message is displayed
// and false is returned, else true is returned.

function ForceLengthMax(objField, nLength)
{
	var strField = new String(objField.value);
	if (strField.length > nLength) {
		return false;
	} 
	return true;
}

// This function ensures that a field is greater than or equal to the
// Length passed in.  You must call this function with the element
// name in your form (for example: "ForceLength(document.forms[0].txtElement)"
// as opposed to "ForceLength(document.forms[0].txtElement.value)"
// If the field's value is too large, an error message is displayed
// and false is returned, else true is returned.
function ForceLengthMin(objField, nLength)
{
	var strField = new String(objField.value);
	if (strField.length < nLength) {
			return false;
	} 
	return true;
}



/****************************************************************/

// This function ensures that a selection has been from a group of radio buttons
function isChecked(objField)
{
// Loop from zero to the one minus the number of radio button selections
for (counter = 0; counter < objField.length; counter++)
{
	// If a radio button has been selected it will return true
	// (If not it will return false)
	if (objField[counter].checked){
		return true;
	}
}
	return false;
}