Review

In this lesson, we’ve explored form validation from many angles. Let’s review what we covered:

• Modern websites require a lot of information from their users and they collect a lot of this information through HTML forms.

• It’s essential to validate the data submitted through forms to keep websites secure and to make sure they function correctly.

• Regular expressions are sequences of characters that define patterns to look for in text. They are an important tool used in validating input.

• Modern HTML comes with useful built-in methods for form validation.

• Custom and complicated client-side validation can be accomplished with JavaScript.

• Asynchronous requests to the server can perform back-end validations before a form has been submitted.

• A final back-end validation of all data is required to ensure an application’s security and sanitize all data.

Instructions

Whew! You learned a lot. Now take a rest and enjoy this comic by cartoonist Randall Munroe (XKCD). You deserve a laugh.