If the number is definitely invalid (but not necessarily if it’s a valid number).In particular, there are several important pieces of information that can be gleaned from the number: It turns out you can learn a lot just from the credit card number itself. Again, we saved a lot of development time (and time to write tests that cover all cases) by using Angular Payment. It turns out date validation isn’t trivial. Any combination of the above- 42019, 042019, 4 should work.Assumptions about the year should be made, for instance a year of “12” should mean 2012 and should fail validation.For the year, “19” or “2019” could both be valid.If the date is in February, “2” is valid but a month of “20” should not be.The user could type “0” followed by “4” for the month, or simply “4”.This can be accomplished in several ways: Imagine an expiration date of April, 2019 the user is shown a single input field and needs to enter the month and year. Besides when the date was, there are also several different ways people could enter the date. Expiration DateĮxpiration date (expiry) is another form entry that needs validation, because we do not want to allow users to enter an expiry in the past. This validation is straightforward, and Angular Payments supports it.
However not all credit cards have a CSC, so a length of 0 is also fine, and validation can pass by leaving the input field blank.
#CREDIT CARD VALIDATOR RAILS CODE#
The card security code (CSC, also sometimes called CVV or CVC) is located on the back of the card and can be three or four digits long.
How Credit Card Validation Worksįor the app I wrote, it was necessary to validate the card security code, the expiration date, and the credit card number itself. Obviously, payments-format and payments-validate can be brought together into the same input field. The FORMATTING_TYPE can also be “card,” “expiry,” or “cvc.” Formatting will take a string of digits like “4111111111111111” and make it “4111 1111 1111 1111”, giving our form a much more polished and professional look.
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