If the callback parameter is omitted, the function will return the result object: var result = $('#cc_number'). The above code will alert the value of the #cc_number field each time it changes. A java library that utilizes the Luhn algorithm to test for validity of numeric credit card combinations. Following is the implementation of luhnâs algorithm for validation of credit card in javascript. Create a sum of this doubled values, remainders and each digit then divide it by 10. If the result of doubling the number is a single digit, keep it as it is, otherwise add the two digits to get a single digit. Starting from right to left, we need to double each number. Check the prefic of the credit card number. The value of this inside the callback is set to the input element to which the validator was attached: $('#cc_number').validateCreditCard(function(result) Get a double of every alternate digit, if the double value is greater than 9 then take its remainder and add it to 1. Check whether number of digits in given credit card number is between 13 to 16. In browsers that donât support input event, the callback will be called only when the user releases a key on their keyboard ( keyup event). That means, in most browsers, it will run the callback every time the value changes: regardless of how the change was initiated (keystroke, paste, undo, redo, etc). The plugin uses input event with a fallback to keyup. + '\nLength validation: ' + result.length_valid CreditCardValidator Custom validators can be used in a JSF page with the tag, as in the following example. The challenge Letâs implement the Luhn Algorithm, which is used to help validate credit card numbers.If the callback parameter is specified, the plugin will call it every time the fieldâs value changes and pass it the result object: $('#cc_number').validateCreditCard(function(result)Īlert('CC type: ' + result.card_type.name
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