/* *************************************************************
** FORMVAL.JS - JS Form Validation Library
** =======================================
** This library contains code to validate HTML form-field data.
** The bulk of this file was derived from Eric Krock's FormChek.js at
** developer.netscape.com/docs/examples/javascript/formval/overview.html
** (Many thanks, Eric!) Enjoy ... and please maintain this header.
**
** To load this library in an HTML doc, put the following
** line in the doc's HEAD (before any other SCRIPT tags):
**
** <SCRIPT SRC="formval.js" LANGUAGE="JavaScript"></SCRIPT>
**
** Author      Ver  Date     Comments
** ======      ===  ====     ========
** Eric Krock  1.0  2/18/97  original JS 1.0-only version
** Rick Scott  2.0  2/1/00   streamlined file by removing:
**                           SS check, credit-card checks,
**                           defaultEmptyOK, and much more;
**                           added stripLeadingBlanks(),
**                           stripTrailingBlanks(), 
**                           stripLeadingTrailingBlanks(),
**                           getCheckedRadioButton(), 
**                           getCheckedCheckboxes(), 
**                           getCheckedSelectOptions()
**
** (c) 1997 Netscape Communications Corporation
** Copyright 2000, Rick Scott, all rights reserved.
************************************************************* */

/* *************************************************************
** USAGE
** =====
** Functions to Validata Form-Element Data:
**   isEmpty(s) - true if string s is empty
**   isBlank(s) - true if string s is empty or blank (all whitespace chars)
**   isLetter(c) - true if char c is an English letter 
**   isDigit(c) - true if char c is a digit 
**   isInteger(s) - true if string s is a signed/unsigned number
**   isIntegerInRange(s, a, b) - true if string s (integer) is a <= s <= b
**   isFloat(s) - true if string s is a signed/unsigned floating-point number
**   isAlphanumeric(s) - true if s is English letters and numbers only
**   isUSPhoneNumber(s) - true if string s is a valid U.S. phone number
**   isZIPCode(s) - true if string s is a valid U.S. ZIP code
**   isStateCode(s) - true if string s is a valid U.S. (2-letter) state code
**   isEmail(s) - true if string s is a valid email address
**   getCheckedRadioButton(radioSet) - gets index checked radio button in set
**   getCheckedCheckboxes(checkboxSet) - gets index(es) of checked checkboxes in set
**   getCheckedSelectOptions(select) - gets index(es) of checked select options
**
** Functions to Reformat input=text Form-Field Data:
**   stripCharsInBag(s, bag) - removes all chars in string bag from string s
**   stripCharsNotInBag(s, bag) - removes all chars NOT in string bag from string s
**   stripBlanks(s) - removes all blank chars from s
**   stripLeadingBlanks(s) - removes leading blank chars from s
**   stripTrailingBlanks(s) - removes trailing blank chars from s
**   stripLeadingTrailingBlanks(s) - removes lead+trail blank chars from s
**   reformatString(targetStr, str1, int1 [, str2, int2 [, ..., ...]]) - 
**     inserts formatting chars or delimiters in targetStr (see below)
************************************************************* */


/* ********************************************************** */
/* Global Variables and Constants *************************** */
/* ********************************************************** */

var digits = "0123456789";
var lowercaseLetters = "abcdefghijklmnopqrstuvwxyz"
var uppercaseLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
var blanks = " \t\n\r";  // aka whitespace chars

// decimal point character differs by language and culture
var decimalPointDelimiter = "."

// non-digit characters allowed in phone numbers
var phoneNumberDelimiters = "()- ";

// characters allowed in US phone numbers
var validUSPhoneChars = digits + phoneNumberDelimiters;

// U.S. phone numbers have 10 digits, formatted as ### ### #### or (###)###-####
var digitsInUSPhoneNumber = 10;

// non-digit characters which are allowed in ZIP Codes
var ZIPCodeDelimiters = "-";

// our preferred delimiter for reformatting ZIP Codes
var ZIPCodeDelimeter = "-"

// U.S. ZIP codes have 5 or 9 digits, formatted as ##### or #####-####
var digitsInZIPCode1 = 5
var digitsInZIPCode2 = 9

// Valid U.S. Postal Codes for states, territories, armed forces, etc.
// See http://www.usps.gov/ncsc/lookups/abbr_state.txt
var USStateCodeDelimiter = "|";
var USStateCodes = "AL|AK|AS|AZ|AR|CA|CO|CT|DE|DC|FM|FL|GA|GU|HI|ID|IL|IN|IA|KS|KY|LA|ME|MH|MD|MA|MI|MN|MS|MO|MT|NE|NV|NH|NJ|NM|NY|NC|ND|MP|OH|OK|OR|PW|PA|PR|RI|SC|SD|TN|TX|UT|VT|VI|VA|WA|WV|WI|WY|AE|AA|AE|AE|AP|al|ak|as|az|ar|ca|co|ct|de|dc|fm|fl|ga|gu|hi|id|il|in|ia|ks|ky|la|me|mh|md|ma|mi|mn|ms|mo|mt|ne|nv|nh|nj|nm|ny|nc|nd|mp|oh|ok|or|pw|pa|pr|ri|sc|sd|tn|tx|ut|vt|vi|va|wa|wv|wi|wy|ae|aa|ae|ae|ap"


/* ********************************************************** */
/* Functions ************************************************ */
/* ********************************************************** */


// Returns true if string s is empty

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


// Returns true if string s is empty or all blank chars

function isBlank(s)
  {
  var i;

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

  // Search through string's chars one by one until we find first
  // non-blank char, then return false; if we don't, return true
  for (i=0; i<s.length; i++)
    {   
    // Check that current character isn't blank
    var c = s.charAt(i);
    if (blanks.indexOf(c) == -1) 
      return false;
    }
  // All characters are blank
  return true;
  }


// Removes all characters which appear in string bag from string s

function stripCharsInBag (s, bag)
  {
  var i;
  var returnString = "";

  // Search through string's characters one by one;
  // if character is not in bag, append to returnString
  for (i = 0; i < s.length; i++)
    {   
    // Check that current character isn't blank
    var c = s.charAt(i);
    if (bag.indexOf(c) == -1) 
      returnString += c;
    }
  return returnString;
  }


// Removes all characters which do NOT appear in string bag from string s

function stripCharsNotInBag (s, bag)
  {
  var i;
  var returnString = "";

  // Search through string's characters one by one;
  // if character is in bag, append to returnString
  for (i = 0; i < s.length; i++)
    {   
    // Check that current character isn't blank
    var c = s.charAt(i);
    if (bag.indexOf(c) != -1) 
      returnString += c;
    }
  return returnString;
  }


// Removes all blank chars (as defined by blanks) from s

function stripBlanks(s)
  {
  return stripCharsInBag(s, blanks)
  }


// Removes leading blank chars (as defined by blanks) from s

function stripLeadingBlanks(s)
  { 
  var i = 0;
  while ((i < s.length) && (blanks.indexOf(s.charAt(i)) != -1))
     i++;
  return s.substring(i, s.length);
  }


// Removes trailing blank chars (as defined by blanks) from s

function stripTrailingBlanks(s)
  { 
  var i = s.length - 1;
  while ((i >= 0) && (blanks.indexOf(s.charAt(i)) != -1))
     i--;
  return s.substring(0, i+1);
  }


// Removes leading+trailing blank chars (as defined by blanks) from s

function stripLeadingTrailingBlanks(s)
  { 
  s = stripLeadingBlanks(s);
  s = stripTrailingBlanks(s);
  return s;
  }


// Returns true if character c is an English letter (A .. Z, a..z)

function isLetter(c)
  {
  return (((c >= "a") && (c <= "z")) || ((c >= "A") && (c <= "Z")));
  }


// Returns true if character c is a digit (0 .. 9)

function isDigit(c)
  {
  return ((c >= "0") && (c <= "9"));
  }


// Returns true if all chars in string s are numbers;
// first character is allowed to be + or -; does not 
// accept floating point, exponential notation, etc.

function isInteger(s)
  {
  if (isBlank(s))
    return false;

  // skip leading + or -
  if ((s.charAt(0) == "-") || (s.charAt(0) == "+"))
    var i = 1;
  else
    var i = 0;

  // Search through string's chars one by one until we find a 
  // non-numeric char, then return false; if we don't, return true
  for (i; i<s.length; i++)
    {   
    // Check that current character is number
    var c = s.charAt(i);
    if (!isDigit(c)) 
      return false;
    }
  // All characters are numbers
  return true;
  }


// True if string s is an unsigned floating point (real) number; 
// first character is allowed to be + or -; no exponential notation.

function isFloat(s)
  { 
  var seenDecimalPoint = false;

  if (isBlank(s)) 
    return false;
  if (s == decimalPointDelimiter) 
    return false;

  // skip leading + or -
  if ((s.charAt(0) == "-") || (s.charAt(0) == "+"))
    var i = 1;
  else
    var i = 0;

  // Search through string's chars one by one until we find a 
  // non-numeric char, then return false; if we don't, return true

  for (i; i<s.length; i++)
    {   
    // Check that current character is number
    var c = s.charAt(i);

    if ((c == decimalPointDelimiter) && !seenDecimalPoint) 
      seenDecimalPoint = true;
    else if (!isDigit(c)) 
      return false;
    }
  // All characters are numbers
  return seenDecimalPoint;
  }


// Returns true if string s is English letters (A .. Z, a..z) only

function isAlphabetic(s)
  {
  var i;

  if (isBlank(s)) 
     return false;

  // Search through string's chars one by one until we find a 
  // non-alphabetic char, then return false; if we don't, return true

  for (i = 0; i < s.length; i++)
  {   
  // Check that current character is letter
  var c = s.charAt(i);

  if (!isLetter(c))
    return false;
  }

  // All characters are letters
  return true;
  }


// Returns true if string s is English letters (A .. Z, a..z) and numbers only

function isAlphanumeric(s)
  {
  var i;

  if (isBlank(s)) 
     return false;

  // Search through string's chars one by one until we find a 
  // non-alphanumeric char, then return false; if we don't, return true

  for (i = 0; i < s.length; i++)
    {   
    // Check that current character is number or letter
    var c = s.charAt(i);

    if (! (isLetter(c) || isDigit(c) ) )
    return false;
    }

  // All characters are numbers or letters
  return true;
  }


// reformatString(targetStr [, str1, int1, str2, int2, ... strN, intN])       
//
// Handy function for arbitrarily inserting formatting characters
// or delimiters of various kinds within targetString.
//
// reformatString() takes one required string argument, targetStr, 
// and 0-N optional string/integer-pair arguments. These optional 
// arguments specify how targetStr is to be reformatted and how/where 
// other strings are to be inserted in it.
//
// reformatString() processes the optional args in order one by one.
// * If the argument is an integer, reformatString() appends that number 
//   of sequential characters from targetStr to the resultString.
// * If the argument is a string, reformatString() appends the string
//   to the resultString.
//
// NOTE: The first argument after targetString must be a string.
// (It can be empty.)  The second argument must be an integer.
// Thereafter, integers and strings must alternate.  This is to
// provide backward compatibility to Navigator 2.0.2 JavaScript
// by avoiding use of the typeof operator.
//
// It is the caller's responsibility to make sure that we do not
// try to copy more characters from s than s.length.
//
// EXAMPLES:
//
// * To reformat a 10-digit U.S. phone number from "1234567890"
//   to "(123)456-7890" make this function call:
//   reformatString("1234567890", "(", 3, ")", 3, "-", 4)
//
// HINT:
//
// If you have a string which is already delimited in one way
// (example: a phone number delimited with spaces as "123 456 7890")
// and you want to delimit it in another way using function reformat,
// call stripCharsNotInBag() or stripBlanks() to remove unwanted 
// characters, THEN call function reformatString to delimit as desired.
//
// EXAMPLE:
//
// reformatString(stripCharsNotInBag ("123 456 7890", digits),
//           "(", 3, ") ", 3, "-", 4)

function reformatString(targetString)
  { 
  var arg;
  var sPos = 0;
  var resultString = "";

  for (var i=1; i<reformatString.arguments.length; i++)
    {
    arg = reformatString.arguments[i];
    if (i%2 == 1) 
      {
      resultString += arg;
      }
    else
      {
      resultString += targetString.substring(sPos, sPos + arg);
      sPos += arg;
      }
    }
  return resultString;
  }


// Returns true if s is valid U.S. phone number (with area code): 10 digits

function isUSPhoneNumber(s)
  { 
  if (isBlank(s)) 
    return false;
  s = stripCharsNotInBag(s, digits);
  return (isInteger(s) && (s.length == digitsInUSPhoneNumber));
  }


// Returns true if string s is a valid U.S. ZIP code: ##### or #####-####

function isZIPCode(s)
  { 
  if (isBlank(s)) 
    return false;

  s = stripLeadingTrailingBlanks(s);

  if ((isInteger(s)) && (s.indexOf("-") == -1) &&  // #####
      (s.length == digitsInZIPCode1))
    return true;

  if (s.indexOf("-") != 5)  // - in wrong place
    return false;

  s = stripCharsNotInBag(s, digits);

  if (s.length == digitsInZIPCode2)
    return true;   // #####-####
  else
    return false;  // not #####-####
  }


// Returns true if s is valid 2-letter U.S. state abbreviation

function isStateCode(s)
  { 
  if (isBlank(s)) 
    return false;
  return ((USStateCodes.indexOf(s) != -1) &&
          (s.indexOf(USStateCodeDelimiter) == -1))
  }


// Returns true if string is a valid email address: @ and . required,
// at least one char before @, at least one char before and after .

function isEmail(s)
  { 
  if (isBlank(s)) 
    return false;
  
  // there must be >= 1 character before @, so we start
  // start looking at character position 1 (i.e. second character)
  var i = 1;
  var sLength = s.length;

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

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

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

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


// Returns true if string s is an integer such that a <= s <= b

function isIntegerInRange (s, a, b)
  { 
  if (isBlank(s)) 
    return false;
  if (!isInteger(s)) 
    return false;
  var num = parseInt(s);
  return ((num >= a) && (num <= b));
  }


// Returns index of checked radio button in radio set,
// or -1 if no radio buttons are checked

function getCheckedRadioButton(radioSet)
  { 
  for (var i=0; i<radioSet.length; i++)
    if (radioSet[i].checked)
      return i;
  return -1;
  }


// Returns array containing index(es) of checked checkbox(es) 
// in checkbox set, or -1 if no checkboxes are checked

function getCheckedCheckboxes(checkboxSet)
  {
  var arr = new Array();
  for (var i=0,j=0; i<checkboxSet.length; i++)
    if (checkboxSet[i].checked)
      arr[j++] = i;
  if (arr.length > 0)
    return arr;
  else
    return -1;
  }


// Returns array containing index(es) of checked option(s) 
// in select box, or -1 if no options are selected

function getCheckedSelectOptions(select)
  {
  var arr = new Array();
  for (var i=0,j=0; i<select.length; i++)
    if (select.options[i].selected)
      arr[j++] = i;
  if (arr.length > 0)
    return arr;
  else
    return -1;
  }