ui.Map.onChangeZoom

Registers a callback that's fired when the map zoom level changes.

Returns an ID which can be passed to unlisten() to unregister the callback.

Usage	Returns
Map.onChangeZoom(callback)	String

Argument	Type	Details
this: ui.map	ui.Map	The ui.Map instance.
callback	Function	The callback to fire when the map zoom change. The callback is passed two parameters: the new zoom level and the map widget itself.