Using Advanced Validation

Form validation is more than just ensuring the user entered something into each element. It can be a cruical asset for users on phones (where a contextual keyboard will pop up on the phone), folks who use screen readers, or people who are just in a hurry and don’t notice minor mistakes. In all of these cases, having the form pop up reminders, as soon as it knows what’s wrong, will be a boon for the user. Let’s dive into validation beyond a basic phone number and brainstorm a few rules about our form.

Inline Error Messages

images/aside-icons/note.png For the remainder of this chapter, I’ll skip adding the error messages to the form to keep focus ...

Get Build Reactive Websites with RxJS now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.