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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>
​
<p><strong>Note:</strong> The oninvalid event is not supported in Internet Explorer 9 and earlier or Safari.</p>
​
</body>
​
<!-- Mirrored from www.w3schools.com/tags/tryit.asp?filename=tryhtml5_ev_oninvalid by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:09:26 GMT -->
</html>
​
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