Update to point to widgetsnbextension

notebook/notebookapp.py

@@ -241,12 +241,12 @@ class NotebookWebApplication(web.Application):
         # BEGIN HARDCODED WIDGETS HACK
         widgets = None
         try:
-            widgets = __import__('jupyter-js-widgets-nbextension')
+            import widgetsnbextension as widgets
         except:
             try:
-                widgets = __import__('ipywidgets')
+                import ipywidgets as widgets
             except:
-                app_log.warning('Widgets are unavailable. Please install jupyter-js-widgets-nbextension or ipywidgets 4.0')
+                app_log.warning('Widgets are unavailable. Please install widgetsnbextension or ipywidgets 4.0')
         if widgets is not None:
             handlers.append(
                 (r"/nbextensions/widgets/(.*)", FileFindHandler, {

notebook/static/notebook/js/main.js

@@ -59,7 +59,7 @@ require([
     utils.load_extension('widgets/extension').catch(function () {
     // Fallback to the ipywidgets extension
         utils.load_extension('widgets/notebook/js/extension').catch(function () {
-            console.warn('ipywidgets package not installed.  Widgets are not available.');
+            console.warn('Widgets are not available.  Please install widgetsnbextension or ipywidgets 4.0');
         });
     });
     // END HARDCODED WIDGETS HACK