HTML oninvalid event Attribute

Example

<form action="action.php">
  Name: <input type="text" oninvalid="alert('You must enter this field!');" name="fname" required>
  <input type="submit" value="Submit">
</form>

Try this code ❯

Meaning

The oninvalid attribute fires when a submittable element do not satisfy their constraints during form validation.

Standard Syntax

<element oninvalid="script">

Attribute Values

Value	Description
script	Specifies the script to be run on oninvalid

Technical Details

Supported HTML elements:

<input>