HTML | oninvalid Event Attribute

The oninvalid event attribute works when an input field values are invalid or empty. The script run when a user clicks on the submit button. The required input field must be filled before submitting it.

Syntax:

<element oninvalid = "script">

Attribute Value: This attribute contains single value script which works when oninvalid attribute called. It is supported by all HTML elements.

Example:

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code

<!DOCTYPE html>
<html>
    <head>
        <title>oninvalid Event Attribute</title>
        <style>
            h1 {
                color:green;
            }
            body {
                text-align:center;
            }
        </style>
    </head>
    <body>
        <h1>GeeksForGeeks</h1>
        <h2>oninvalid Event Attribute</h2>
        <form action="#" method="post">
            First Name : <input type = "text" oninvalid
            alert('Please Fill all input field!') required><br><br>
            Last Name : <input type = "text" oninvalid =
            alert('Please Fill all input field!') required><br>
            <input type="submit" value="Submit">
        </form>
    </body>
</html>                    

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Output:

Supported Browsers: The browser supported by oninvalid event attribute are listed below: