Enable auto selecting options from another checkbox

Hi @cl4udio,

I hope you keeping well today.

Unfortunately, Forminator does not have an out-of-the-box solution for this and I am sorry to inform you that the requirement looks a bit complex making it fall beyond the scope of our support.

I would recommend that you consider hiring a developer to create a custom solution for this requirement.

Kind Regards,
Nebu John

Hi @cl4udio,

Hope this message finds you well and thanks for reaching us.

We checked with our Devs team about a workaround, and they provided this mu-plugin, you can follow this guide to install it.

add_action('wp_footer', 'wpmudev_form_checkbox_auto_selection', 9999);
function wpmudev_form_checkbox_auto_selection() {
	global $post;
	if ( is_a( $post, 'WP_Post' ) && !has_shortcode($post->post_content, 'forminator_form') ) {
		return;
	}
	?>
	<script type="text/javascript">
    jQuery(document).ready(function($){
		setTimeout(function() {
			$('.forminator-custom-form').trigger('after.load.forminator');
		},100);

		$(document).on('after.load.forminator', function(e, form_id) {
			if ( e.target.id == 'forminator-module-6' ) { //Please change the form ID
                $( document ).on( 'forminator.front.pagination.move', function( e ) {
                    var selected = [];
                    $('.select-check input:checked').each(function() {
                        selected.push($(this).attr('value'));
                    });

                    if ( jQuery.inArray("3", selected) != -1 ) {
                        $('#checkbox-8 input[value="C"]').attr('checked','checked');
                    } else {
                        $('#checkbox-8 input[value="C"]').attr('checked', false);
                    }
                });
            }
        });
    });
	</script>
	<?php
}

Note that you need to replace this line:

if ( e.target.id == 'forminator-module-6' ) { //Please change the form ID

The number 6 with your own Forminator form ID.

Let us know the results.

Best regards,
Laura