I was able to solve this by using guidance found in this post.
The solution that I was able to implement was to pass the figure data for the graph as another argument to the callback. I.e.
@app.callback(
Output(‘my_div’, ‘children’)
, [Input(‘reading_gap_ethnicity_by_year’, ‘clickData’)
, Input(‘reading_gap_ethnicity_by_year’, ‘figure’)]) <- pass in the figure data
def do_something_with_selections(values, figureData):
… now extract the selected point from ‘values’ and its name from ‘figureData’
The approach I referenced in my original post still does not work.
…hope this helps someone else…