The javascript function of "clearChart" does not work properly while no feeding data.
In my scenario, I want to grab the data from db every hour, and when i click the "clear" button, the chart will be cleared.
Because the date interval is so long, while I clicking the "clear" button and trigger the "clearChart" function, it will be no feeding data at the moment. In this scenario, the chart will become a blankboard, and the data will not display in the chart though the feeding data is not null from then.
I think it should be a bug.
thanks and forgive my poor English.