HTML oninvalid Event Attribute

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HTML oninvalid Event Attribute

The oninvalid event attribute triggers when a submittable element has been checked for validity and doesn't satisfy its constraints.

Example

HTML Online Editor
<!DOCTYPE html> <html> <body> <p>Try to submit the empty form</p> <form action="/user-name.php"> Name: <input type="text" name="name" oninvalid="myFunction()" required> <button type="submit">Submit</button> </form> <script> function myFunction(){ alert("Name field should not be empty"); } </script> </body> </html>

Attribute Value

ValueExplanation
scriptScript runs when an element is invalid.

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