Load image menu on demand

boards/models/attachment/viewers.py

@@ -118,7 +118,7 b' class AbstractViewer:'
         for item in items:
             cm_items.append(('{}: {{name: "{}", callback: function(key, opt) {{window.location="{}";}}}}')\
                     .format(item['name'], item['label'], item['url']))
-        return '<script>$.contextMenu({{trigger: "left", selector: "#file{} .file-menu", items: {{ {} }} }});</script>'.format(self.hash, ', '.join(cm_items))
+        return '<script>$.contextMenu({{trigger: "left", selector: "#file{} .file-menu", build: function($trigger, e) {{return {{items: {{ {} }} }}}}}});</script>'.format(self.hash, ', '.join(cm_items))
 
 
 class VideoViewer(AbstractViewer):