show required message for ajax add to cart

Hi,

Could you please check after adding the below code in your child theme’s functions.php file?

add_action('wp_footer','th_add_required_attribute',999);
function th_add_required_attribute(){
    ?>
    <script>
    (function($){

        $(document).ready(function() {
           $('input[name="field_name"]').attr('required', true);
        });
        
    })(jQuery, window, document)
    </script>
    <?php
}

Please replace the field_name in the above code snippet with your corresponding field name.

We hope this will help.

Thank you!