Whether you are accepting input for something as simple as a guestbook or something as complex as an employment application, it makes sense to check the users input before committing it to a database or even an email.There are two basic types of validation: server-side and client-side.If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
For our example we will be using something simple and practical; a guestbook. We have included very specific HTML input elements in order to demonstrate our different validation concepts to follow.
Hi all, I am looking for a little help validating a forms input.
On the form are key items which I do not wish to be zero length.
However, if the string is recognized as an ISO format string and it contains invalid values, it will return The compatibility table in this page is generated from structured data.
If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.