Prevent to change the select input value if NO to confirm via Jquery

Find the code below to prevent the Select box/Dropbox to alter the value if 'NO' to Confirm using Jquery.

 var prev_rank_val;
        $( '#rank_level_id' ).focus(function() {
            prev_rank_val = $(this).val();
        })
        .change(function() {
            $(this).blur() // Firefox fix 

            var msg = "Are you sure you want to continue?"; // message here
            var action = confirm(msg);

            if ( action==true) {
                return true;
            }
            else {
                $(this).val(prev_val); // rollback the current value if to No
                return false;
            }
        });