Handle patch events on source changes

holoviews/plotting/bokeh/callbacks.py

@@ -272,7 +272,7 @@ def set_customjs_callback(self, js_callback, handle):
         if self.on_events:
             for event in self.on_events:
                 handle.js_on_event(event, js_callback)
-        elif self.on_changes:
+        if self.on_changes:
             for change in self.on_changes:
                 handle.js_on_change(change, js_callback)
         elif hasattr(handle, 'callback'):
@@ -389,7 +389,7 @@ def set_server_callback(self, handle):
         if self.on_events:
             for event in self.on_events:
                 handle.on_event(event, self.on_event)
-        elif self.on_changes:
+        if self.on_changes:
             for change in self.on_changes:
                 handle.on_change(change, self.on_change)
 
@@ -913,6 +913,7 @@ class CDSCallback(Callback):
     attributes = {'data': 'source.data'}
     models = ['source']
     on_changes = ['data']
+    on_events = ['patch']
 
     def initialize(self, plot_id=None):
         super(CDSCallback, self).initialize(plot_id)