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If the data is invalid, the input box should be red.
Therefore, we'll create CSS classes to represent these possible outcomes.
All credit cards are 16 digits and the 16th digit can be calculated based on the first 15 numbers.
This means you can use Java Script to check for, and alert the user to, credit card typos.
We also want to implement real-time validation where the color of the input will change based on the validity of the data that has been entered.
If you haven't already, make sure that you've included the j Query library on your page: Since the name field is required, we simply need to check whether a value for the input exists.
In this way, client side form validation can vastly improve the user experience.
This article will explain some basics about form validation and then illustrate how to validate form fields using j Query.
However, to see whether a credit card has sufficient funds requires communicating with the credit card company and that can only be done using a server side programming language.
Similarly, form data is typically saved in a database on the server.