Opaque listener handle returned by the Google Charts event helpers.
The real handle exposes only getKey(); listeners are detached by passing the handle back to GoogleEvents.removeListener (there is no remove() method on the handle itself).
getKey()
remove()
Opaque listener handle returned by the Google Charts event helpers.
The real handle exposes only
getKey(); listeners are detached by passing the handle back to GoogleEvents.removeListener (there is noremove()method on the handle itself).