Hi Venkat,
Is it that the function fnOnSelectChart is getting called and the alerts do not return anything?
I tried the same, I get empty alerts- those methods returns the indices and names respectively of the legend items on selection of legend items. Sorry for the incorrect information in the earlier post.
If possible, can you please post a screenshot of the bar chart that is rendered and the expected value on selection of a bar - just to better understand your scenario.
Regards,
Ria