The HTML oninvalid event attribute is triggered when an input field is invalid while submitting the form in an HTML document.

Syntax

Following is the syntax ?

Example

Let us see an example of HTML oninvalid event Attribute ?

HTML oninvalid Event Attribute Demo

Click on SUBMIT button without writing any message

Output

Click on "SUBMIT" button without entering any message in the text area and observe how oninvalid attribute works ?