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<!DOCTYPE html>
<html>
<body>
​
<form action="https://www.w3schools.com/action_page.php" method="get">
  Name: <input type="text" id="myInput" name="fname" required>
  <input type="submit" value="Submit">
</form>
​
<p><strong>Note:</strong> The oninvalid event is not supported in Internet Explorer 9 and earlier.</p>
​
<script>
document.getElementById("myInput").oninvalid = function() {myFunction()};
​
function myFunction() {
  alert("You must fill out the form!");
}
</script>
​
</body>
​
</html>
​
​
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