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<!DOCTYPE html> <html> <body> <form action="https://www.w3schools.com/action_page.php" method="get"> Name: <input type="text" oninvalid="alert('You must fill out the form!');" name="fname" required> <input type="submit" value="Submit"> </form> <p>If you click submit, without filling out the text field, an alert message will occur.</p> </body> <!-- /jsref/tryit.asp?filename=tryjsref_oninvalid Thu, 06 Feb 2025 18:36:49 GMT --> </html>
