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