Web Reference: HTML form validation can be done by JavaScript. If a form field (fname) is empty, this function alerts a message, and returns false, to prevent the form from being submitted: Mar 27, 2026 · This section explains how to build a form validation application that verifies important fields such as first name, last name, username, email, and password. It also covers two different approaches to validation, providing a clear understanding of how to handle user input effectively. Dec 5, 2025 · This is called form validation. When you enter data, the browser (and the web server) will check to see that the data is in the correct format and within the constraints set by the application. Validation done in the browser is called client-side validation, while validation done on the server is called server-side validation.
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