oninvalid
The oninvalid event is triggered when a submittable <input> element fails validation.
oninvalid event
The oninvalid event occurs when a <input> element fails validation, allowing for custom validation messages or specific actions to be handled.
Syntax
index.html
<element oninvalid="script">
Example
::event-oninvalid
::
index.html
<!DOCTYPE html>
<html>
<body>
<form action="/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 Safari.</p>
</body>
</html>
Values
Conclusion
The oninvalid event is essential for handling form validation errors. It enables developers to provide custom feedback or actions when a <input> element fails validation, improving the user experience and ensuring the correct data is submitted.