Credit card validator luhn java github4/18/2023 ![]() To do so, listen for both the keyup and blur events. The only thing left to do is tie this functionality into a form. Keep in mind that the getCreditCardType() function looks at only the first few digits, and so works both when there are dashes in the account number and when there are not. You can use getCreditCardType() like this: var type = getCreditCardType("5555-5555-5555-4444") The accountNumber argument should be a string (the same as the value of the text input field you’ll be evaluating). This function makes extensive use of regular expressions to verify the credit card type. start without knowing the credit card type function getCreditCardType(accountNumber) Knowing this, it’s possible to write a simple JavaScript function to determine the type of credit card given an account number.
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