confirmation added to form if no tags selected

app/views/admin/announcements/_form.html.erb

@@ -328,7 +328,17 @@
     </div>
   </div>
 </span>
-
+<% if !@module_app.tags.empty? %>
+  <script type="text/javascript">
+    $("form.previewable").on("submit", function(){
+      if(!$("input[name='bulletin[tags][]']").is(":checked")){
+        if(!confirm("You have selected no tag, do you wish to continue?")){
+          return false;
+        }
+      }
+    })
+  </script>
+<% end %>
 <% content_for :page_specific_javascript do %>
   <script>
     function Appendzero(obj)