// checkCreditCard (radio, theField) Validate credit card info.
// CREDIT CARD DATA VALIDATION FUNCTIONS
//
// getRadioButtonValue (radio) Get checked value from radio button.
// stripCharsInBag (s, bag) Removes all characters in string bag from string s.
// warnInvalid (theField, s) Notify user that contents of field theField are invalid.
// isCreditCard (st) True if credit card number passes the Luhn Mod-10 test.
// isVisa (cc) True if string cc is a valid VISA number.
// isMasterCard (cc) True if string cc is a valid MasterCard number.
// isAmericanExpress (cc) True if string cc is a valid American Express number.
// isDinersClub (cc) True if string cc is a valid Diner's Club number.
// isCarteBlanche (cc) True if string cc is a valid Carte Blanche number.
// isDiscover (cc) True if string cc is a valid Discover card number.
// isEnRoute (cc) True if string cc is a valid enRoute card number.
// isJCB (cc) True if string cc is a valid JCB card number.
// isAnyCard (cc) True if string cc is a valid card number for any of the accepted types.
// isCardMatch (Type, Number) True if Number is valid for credic card of type Type.
//
// non-digit characters which are allowed in credit card numbers
var creditCardDelimiters = ""
var iCreditCardPrefix = "Sorry!! This is not a valid "
var iCreditCardSuffix = " credit card number. Please reenter and try again."
// Validate credit card month & year.
function checkCardDate(monthField, yearField)
{
// first, make sure fields exist and are drop-downs
if(monthField == null || yearField == null
|| monthField.options == null || yearField.options == null)
return true;
var month = monthField.options[monthField.selectedIndex].value;
var year = yearField.options[yearField.selectedIndex].value;
if(month == 'Month')
month = '';
if(year == 'Year')
year = '';
// both need to be filled
if(month == '' || year == '')
{
return false;
}
// check if exp date is in the past
var today = new Date();
// Note: in Javascript, months are zero-based (i.e Jan is 0 and Dec is 11).
// exp day is 1rst of the month, implicitly.
thisYear = today.getFullYear();
thisMonth = today.getMonth() + 1;
if( month.charAt(0) == '0')
month = month.substr(1); // 09 --> 9
if (year.length == 2)
year = '20' + year ; // 01 --> 2001
//debug('today is ' + thisMonth + ' / ' + thisYear + ' and exp date is ' + month + ' / ' + year);
if ( year < thisYear || ( year == thisYear && month < thisMonth) )
{
return false;
}
return true;
}
// Get checked value from radio button.
//function getRadioButtonValue (radio)
//{ for (var i = 0; i < radio.length; i++)
// { if (radio[i].checked) { break }
// }
// return radio[i].value
//}
function getRadioButtonValue (radio)
{
return radio[radio.selectedIndex].value
}
// 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 whitespace.
var c = s.charAt(i);
if (bag.indexOf(c) == -1) returnString += c;
}
return returnString;
}
// Validate credit card info.
function checkCreditCard (radio, theField)
{
var cardType = getRadioButtonValue (radio)
var normalizedCCN = stripCharsInBag(theField.value, creditCardDelimiters)
if (!isCardMatch(cardType, normalizedCCN))
return warnInvalid (theField, iCreditCardPrefix + cardType + iCreditCardSuffix);
else
{ theField.value = normalizedCCN
return true
}
}
/* ================================================================
Credit card verification functions
Originally included as Starter Application 1.0.0 in LivePayment.
20 Feb 1997 modified by egk:
changed naming convention to initial lowercase
(isMasterCard instead of IsMasterCard, etc.)
changed isCC to isCreditCard
retained functions named with older conventions from
LivePayment as stub functions for backward
compatibility only
added "AMERICANEXPRESS" as equivalent of "AMEX"
for naming consistency
================================================================ */
/* ================================================================
FUNCTION: isCreditCard(st)
INPUT: st - a string representing a credit card number
RETURNS: true, if the credit card number passes the Luhn Mod-10
test.
false, otherwise
================================================================ */
function isCreditCard(st) {
// Encoding only works on cards with less than 19 digits
if (st.length > 19)
return (false);
sum = 0; mul = 1; l = st.length;
for (i = 0; i < l; i++) {
digit = st.substring(l-i-1,l-i);
tproduct = parseInt(digit ,10)*mul;
if (tproduct >= 10)
sum += (tproduct % 10) + 1;
else
sum += tproduct;
if (mul == 1)
mul++;
else
mul--;
}
// Uncomment the following line to help create credit card numbers
// 1. Create a dummy number with a 0 as the last digit
// 2. Examine the sum written out
// 3. Replace the last digit with the difference between the sum and
// the next multiple of 10.
// document.writeln("
Sum = ",sum,"
");
// alert("Sum = " + sum);
if ((sum % 10) == 0)
return (true);
else
return (false);
} // END FUNCTION isCreditCard()
/* ================================================================
FUNCTION: isVisa()
INPUT: cc - a string representing a credit card number
RETURNS: true, if the credit card number is a valid VISA number.
false, otherwise
Sample number: 4111 1111 1111 1111 (16 digits)
================================================================ */
function isVisa(cc)
{
if (((cc.length == 16) || (cc.length == 13)) &&
(cc.substring(0,1) == 4))
return isCreditCard(cc);
return false;
} // END FUNCTION isVisa()
/* ================================================================
FUNCTION: isMasterCard()
INPUT: cc - a string representing a credit card number
RETURNS: true, if the credit card number is a valid MasterCard
number.
false, otherwise
Sample number: 5500 0000 0000 0004 (16 digits)
================================================================ */
function isMasterCard(cc)
{
firstdig = cc.substring(0,1);
seconddig = cc.substring(1,2);
if ((cc.length == 16) && (firstdig == 5) &&
((seconddig >= 1) && (seconddig <= 5)))
return isCreditCard(cc);
return false;
} // END FUNCTION isMasterCard()
/* ================================================================
FUNCTION: isAmericanExpress()
INPUT: cc - a string representing a credit card number
RETURNS: true, if the credit card number is a valid American
Express number.
false, otherwise
Sample number: 340000000000009 (15 digits)
================================================================ */
function isAmericanExpress(cc)
{
firstdig = cc.substring(0,1);
seconddig = cc.substring(1,2);
if ((cc.length == 15) && (firstdig == 3) &&
((seconddig == 4) || (seconddig == 7)))
return isCreditCard(cc);
return false;
} // END FUNCTION isAmericanExpress()
/* ================================================================
FUNCTION: isDinersClub()
INPUT: cc - a string representing a credit card number
RETURNS: true, if the credit card number is a valid Diner's
Club number.
false, otherwise
Sample number: 30000000000004 (14 digits)
================================================================ */
function isDinersClub(cc)
{
firstdig = cc.substring(0,1);
seconddig = cc.substring(1,2);
if ((cc.length == 14) && (firstdig == 3) &&
((seconddig == 0) || (seconddig == 6) || (seconddig == 8)))
return isCreditCard(cc);
return false;
}
/* ================================================================
FUNCTION: isCarteBlanche()
INPUT: cc - a string representing a credit card number
RETURNS: true, if the credit card number is a valid Carte
Blanche number.
false, otherwise
================================================================ */
function isCarteBlanche(cc)
{
return isDinersClub(cc);
}
/* ================================================================
FUNCTION: isDiscover()
INPUT: cc - a string representing a credit card number
RETURNS: true, if the credit card number is a valid Discover
card number.
false, otherwise
Sample number: 6011000000000004 (16 digits)
================================================================ */
function isDiscover(cc)
{
first4digs = cc.substring(0,4);
if ((cc.length == 16) && (first4digs == "6011"))
return isCreditCard(cc);
return false;
} // END FUNCTION isDiscover()
/* ================================================================
FUNCTION: isEnRoute()
INPUT: cc - a string representing a credit card number
RETURNS: true, if the credit card number is a valid enRoute
card number.
false, otherwise
Sample number: 201400000000009 (15 digits)
================================================================ */
function isEnRoute(cc)
{
first4digs = cc.substring(0,4);
if ((cc.length == 15) &&
((first4digs == "2014") ||
(first4digs == "2149")))
return isCreditCard(cc);
return false;
}
/* ================================================================
FUNCTION: isJCB()
INPUT: cc - a string representing a credit card number
RETURNS: true, if the credit card number is a valid JCB
card number.
false, otherwise
================================================================ */
function isJCB(cc)
{
first4digs = cc.substring(0,4);
if ((cc.length == 16) &&
((first4digs == "3088") ||
(first4digs == "3096") ||
(first4digs == "3112") ||
(first4digs == "3158") ||
(first4digs == "3337") ||
(first4digs == "3528")))
return isCreditCard(cc);
return false;
} // END FUNCTION isJCB()
/* ================================================================
FUNCTION: isAnyCard()
INPUT: cc - a string representing a credit card number
RETURNS: true, if the credit card number is any valid credit
card number for any of the accepted card types.
false, otherwise
================================================================ */
function isAnyCard(cc)
{
if (!isCreditCard(cc))
return false;
if (!isMasterCard(cc) && !isVisa(cc) && !isAmericanExpress(cc) && !isDinersClub(cc) &&
!isDiscover(cc) && !isEnRoute(cc) && !isJCB(cc)) {
return false;
}
return true;
} // END FUNCTION isAnyCard()
/* ================================================================
FUNCTION: isCardMatch()
INPUT: cardType - a string representing the credit card type
cardNumber - a string representing a credit card number
RETURNS: true, if the credit card number is valid for the particular
credit card type given in "cardType".
false, otherwise
================================================================ */
function isCardMatch (cardType, cardNumber)
{
cardType = cardType.toUpperCase();
var doesMatch = true;
if ((cardType == "VISA") && (!isVisa(cardNumber)))
doesMatch = false;
if ((cardType == "MASTERCARD") && (!isMasterCard(cardNumber)))
doesMatch = false;
if ( ( (cardType == "AMERICANEXPRESS") || (cardType == "AMEX") )
&& (!isAmericanExpress(cardNumber))) doesMatch = false;
if ((cardType == "DISCOVER") && (!isDiscover(cardNumber)))
doesMatch = false;
if ((cardType == "JCB") && (!isJCB(cardNumber)))
doesMatch = false;
if ((cardType == "DINERS") && (!isDinersClub(cardNumber)))
doesMatch = false;
if ((cardType == "CARTEBLANCHE") && (!isCarteBlanche(cardNumber)))
doesMatch = false;
if ((cardType == "ENROUTE") && (!isEnRoute(cardNumber)))
doesMatch = false;
return doesMatch;
} // END FUNCTION CardMatch()
// Notify user that contents of field theField are invalid.
// String s describes expected contents of theField.value.
// Put select theField, pu focus in it, and return false.
function warnInvalid (theField, s)
{ theField.focus()
theField.select()
alert(s)
return false
}