Adds an event handler that executes code when a marker is created or deleted.
| _eventType | Type of event to add. Can be “created” or “deleted”. STRING |
| _function | Function to call when marker is created or deleted. <CODE> |
| _eventId | Unique ID. Used with ‘CBA_fnc_removeMarkerEventHandler’. |
_id = ["created", {systemChat str _this}] call CBA_fnc_addMarkerEventHandler;commy2