ticket-view.inc.php

        <?php csrf_token(); ?>
        <input type="hidden" name="id" value="<?php echo $ticket->getId(); ?>">
        <input type="hidden" name="a" value="process">
        <input type="hidden" name="do" id="action" value="">
        <hr style="margin-top:1em"/>
        <p class="full-width">
            <span class="buttons pull-left">
                <input type="button" value="<?php echo __('Cancel');?>" class="close">
            </span>
            <span class="buttons pull-right">
                <input type="submit" value="<?php echo __('OK');?>">
            </span>
         </p>
    </form>
    <div class="clear"></div>
</div>
<script type="text/javascript">
$(function() {
    $(document).on('click', 'a.change-user', function(e) {
        e.preventDefault();
        var tid = <?php echo $ticket->getOwnerId(); ?>;
        var cid = <?php echo $ticket->getOwnerId(); ?>;
        var url = 'ajax.php/'+$(this).attr('href').substr(1);
        $.userLookup(url, function(user) {
            if(cid!=user.id
                    && $('.dialog#confirm-action #changeuser-confirm').length) {
                $('#newuser').html(user.name +' &lt;'+user.email+'&gt;');
                $('.dialog#confirm-action #action').val('changeuser');
                $('#confirm-form').append('<input type=hidden name=user_id value='+user.id+' />');
                $('#overlay').show();
                $('.dialog#confirm-action .confirm-action').hide();
                $('.dialog#confirm-action p#changeuser-confirm')
                .show()
                .parent('div').show().trigger('click');
            }
        });
    });

    // Post Reply or Note action buttons.
    $('a.post-response').click(function (e) {
        var $r = $('ul.tabs > li > a'+$(this).attr('href')+'-tab');
        if ($r.length) {
            // Make sure ticket thread tab is visiable.
            var $t = $('ul#ticket_tabs > li > a#ticket-thread-tab');
            if ($t.length && !$t.hasClass('active'))
                $t.trigger('click');
            // Make the target response tab active.
            if (!$r.hasClass('active'))
                $r.trigger('click');

            // Scroll to the response section.
            var $stop = $(document).height();
            var $s = $('div#response_options');
            if ($s.length)
                $stop = $s.offset().top-125

            $('html, body').animate({scrollTop: $stop}, 'fast');
        }

        return false;
    });

});

$(function() {
    $("#cc_users").select2({width: '350px'});
    $("#bcc_users").select2({width: '350px'});
});

$(function() {
   $('#cc_users').on("select2:select", function(e) {
     var el = $(this);
     var tid = <?php echo $ticket->getThreadId(); ?>;

    if(el.val().includes("NEW")) {
      $("li[title='— Add New —']").remove();
      var url = 'ajax.php/thread/' + tid + '/add-collaborator' ;
       $.userLookup(url, function(user) {
         e.preventDefault();
          if($('.dialog#confirm-action').length) {
              $('.dialog#confirm-action #action').val('addcc');
              $('#confirm-form').append('<input type=hidden name=user_id value='+user.id+' />');
              $('#overlay').show();
          }
       });
          var arr = el.val();
          var removeStr = "NEW";

          arr.splice($.inArray(removeStr, arr),1);
          $(this).val(arr);
     }
  });

  $('#bcc_users').on("select2:select", function(e) {
      var el = $(this);
      var tid = <?php echo $ticket->getThreadId(); ?>;

      if(el.val().includes("NEW")) {
        $("li[title='— Add New —']").remove();
        var url = 'ajax.php/thread/' + tid + '/add-collaborator' ;
         $.userLookup(url, function(user) {
            e.preventDefault();
            if($('.dialog#confirm-action').length) {
                $('.dialog#confirm-action #action').val('addbcc');
                $('#confirm-form').append('<input type=hidden name=user_id value='+user.id+' />');
                $('#overlay').show();
            }
         });
         var arr = el.val();
         var removeStr = "NEW";

         arr.splice($.inArray(removeStr, arr),1);
         $(this).val(arr);
      }
  });

  $('#cc_users').on("select2:unselecting", function(e) {
      var confirmation = confirm(__("Are you sure you want to remove the collaborator from receiving this reply?"));
      if (confirmation == false) {
        $('#cc_users').on("select2:opening", function(e) {
          return false;
        });
        return false;
      }

 });

 $('#bcc_users').on("select2:unselecting", function(e) {
     var confirmation = confirm(__("Are you sure you want to remove the collaborator from receiving this reply?"));
     if (confirmation == false) {
         $('#bcc_users').on("select2:opening", function(e) {
           return false;
         });
         return false;
       }
 });
});
</script>