Drupal 7 ajax div refresh in tpl file

I got a ctools widget/plugin with data printed in tpl file where I want an ajax refresh filter (using checkbox) without breaking the div style. So far what I did:

added jquery ajax post to hook_menu and use drupal_json_output() to get the required data and rendered it with the following jquery code after ajax success just for testing:

success: function (response) {
        $.each( response, function( k, item ) {
          console.log(item.first_name+' '+item.last_name);
          $('#cur_refresh').append(item.first_name +' '+ item.last_name+' ');

What is the better way to do that operation in Drupal 7 to maintain the div style?

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/2/feed