A general purpose library for building credit card forms, validating inputs and formatting numbers.
For example, you can make a input act like a credit card field (with number formatting and length restriction):
$('input.cc-num').payment('formatCardNumber');
Then, when the payment form is submitted, you can validate the card number on the client-side:
var valid = $.payment.validateCardNumber($('input.cc-num').val());
if (!valid) {
alert('Your card is not valid!');
return false;
}
You can find a full demo here.
Supported card types are:
- Visa
- MasterCard
- American Express
- Diners Club
- Discover
- UnionPay
- JCB
- Visa Electron
- Maestro
- Forbrugsforeningen
- Dankort
(Additional card types are supported by extending the $.payment.cards
array.)
Formats card numbers:
- Includes a space between every 4 digits
- Restricts input to numbers
- Limits to 16 numbers
- Supports American Express formatting
- Adds a class of the card type (e.g. 'visa') to the input
Example:
$('input.cc-num').payment('formatCardNumber');
Formats card expiry:
- Includes a
/
between the month and year - Restricts input to numbers
- Restricts length
Example:
$('input.cc-exp').payment('formatCardExpiry');
Formats card CVC:
- Restricts length to 4 numbers
- Restricts input to numbers
Example:
$('input.cc-cvc').payment('formatCardCVC');
General numeric input restriction.
Example:
$('[data-numeric]').payment('restrictNumeric');
Validates a card number:
- Validates numbers
- Validates Luhn algorithm
- Validates length
Example:
$.payment.validateCardNumber('4242 4242 4242 4242'); //=> true
Validates a card expiry:
- Validates numbers
- Validates in the future
- Supports year shorthand
Example:
$.payment.validateCardExpiry('05', '20'); //=> true
$.payment.validateCardExpiry('05', '2015'); //=> true
$.payment.validateCardExpiry('05', '05'); //=> false
Validates a card CVC:
- Validates number
- Validates length to 4
Example:
$.payment.validateCardCVC('123'); //=> true
$.payment.validateCardCVC('123', 'amex'); //=> true
$.payment.validateCardCVC('1234', 'amex'); //=> true
$.payment.validateCardCVC('12344'); //=> false
Returns a card type. Either:
visa
mastercard
amex
dinersclub
discover
unionpay
jcb
visaelectron
maestro
forbrugsforeningen
dankort
The function will return null
if the card type can't be determined.
Example:
$.payment.cardType('4242 4242 4242 4242'); //=> 'visa'
Parses a credit card expiry in the form of MM/YYYY, returning an object containing the month
and year
. Shorthand years, such as 13
are also supported (and converted into the longhand, e.g. 2013
).
$.payment.cardExpiryVal('03 / 2025'); //=> {month: 3: year: 2025}
$.payment.cardExpiryVal('05 / 04'); //=> {month: 5, year: 2004}
$('input.cc-exp').payment('cardExpiryVal') //=> {month: 4, year: 2020}
This function doesn't perform any validation of the month or year; use $.payment.validateCardExpiry(month, year)
for that.
Array of objects that describe valid card types. Each object should contain the following fields:
{
// Card type, as returned by $.payment.cardType.
type: 'mastercard',
// Regex used to identify the card type. For the best experience, this should be
// the shortest pattern that can guarantee the card is of a particular type.
pattern: /^5[0-5]/,
// Array of valid card number lengths.
length: [16],
// Array of valid card CVC lengths.
cvcLength: [3],
// Boolean indicating whether a valid card number should satisfy the Luhn check.
luhn: true,
// Regex used to format the card number. Each match is joined with a space.
format: /(\d{1,4})/g
}
When identifying a card type, the array is traversed in order until the card number matches a pattern
. For this reason, patterns with higher specificity should appear towards the beginning of the array.
Look in ./example/index.html
Run cake build
Run cake test
We recommend you turn autocomplete on for credit card forms, except for the CVC field (which should never be stored). You can do this by setting the autocomplete
attribute:
<form autocomplete="on">
<input class="cc-number">
<input class="cc-cvc" autocomplete="off">
</form>
You should also mark up your fields using the Autofill spec. These are respected by a number of browsers, including Chrome.
<input type="tel" class="cc-number" autocomplete="cc-number">
Set autocomplete
to cc-number
for credit card numbers and cc-exp
for credit card expiry.
We recommend you to use <input type="tel">
which will cause the numeric keyboard to be displayed on mobile devices:
<input type="tel" class="cc-number">