This means you can use Java Script to check for, and alert the user to, credit card typos.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.
The full code looks like this: The same approach can be used to validate the email address.
This article will explain some basics about form validation and then illustrate how to validate form fields using j Query.
There are two types of validation: client side validation and server side validation.
Therefore, we'll create CSS classes to represent these possible outcomes.
Now that we've created a working form, we need to add some j Query and Java Script to validate fields and change the CSS classes that were created earlier.
The only difference is that now we want to check whether the email address looks like an email address.