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HTML | oninvalid Event Attribute

  • Difficulty Level : Basic
  • Last Updated : 03 Aug, 2021

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.
Supported Tags:

  • <input>

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: 
 

html




<!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>                   

Output: 
 

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

  • Chrome
  • Internet Explorer 10.0
  • Firefox
  • Opera

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