Redmine/app/views/timelog/new.js.erb

$('#time_entry_activity_id').html('<%= escape_javascript options_for_select(activity_collection_for_select_options(@time_entry), default_activity(@time_entry)) %>');
$('#time_entry_issue').html('<%= escape_javascript link_to_issue(@time_entry.issue) if @time_entry.issue.try(:visible?) %>');