Listening to Other Query Events

Chart developers may need to apply particular logic to their charts whenever a query event is triggered. Handler functions can be defined to override the following list of query methods:

• controller.onStart: Called as soon as the query execution begins.

• controller.onNoDataFound: Called when no data is available for the given query.

• controller.onNotDirtyData: Called as soon as all of the data is received.

• controller.onStreamError: Called when the query execution returns an error from the server.