Form Validation

Catch mistakes before they submit, with helpful inline messages.

A sign-up form that checks each field and explains what's wrong, right where it's wrong. You'll learn form events, a little regex, and how to give people friendly, accessible feedback.

What's inside

• Validates name, email, password and confirmation
• Inline errors under each field, checked on blur and submit
• A simple email pattern you can actually read
• Accessible with aria-invalid and clear messaging
• No dependencies, no backend needed

Quickstart

$ curl -LO https://devai.io/downloads/form-validation.zip$ unzip form-validation.zip && cd form-validation$ open index.html   # or just double-click the file

Browse the code

The full source, exactly as the zip ships it.