Easy to use client-side form validation for WordPress comments.
Inspired by Instant Comment Validation. Powered by the jQuery Validation plugin.
The plugin provides a filter to change the settings passed to the JavaScript.
Allows you to filter the data that is sent to the JavaScript, like error messages and minimum required comment length.
add_filter( 'js_comment_form_validation_settings', function( $script_data ) {
$script_data['rules']['url']['required'] = true;
return $script_data;
} );