Button on_click callback never called

[Marc]

Do you have a reproducible example of on_click not working?

[StuckDuckF]

Does the original post work for you Mr. @Marc ?

[ahuang11]

on_click callbacks should have an event in args

    def _download_callback(self, event):
        pn.state.notifications.success('_download_callback')
            
    def __init__(self):
        self.download_button = pn.widgets.Button(name="Download")
        self.download_button.on_click(self._download_callback)
        super().__init__()

The error is nested in the browser console