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Adds an Event Handler to the given object.
  • You can add as many Event Handlers of any type as you like to every unit. Existing Event Handlers do not get overwritten.
  • Use removeEventHandler to remove an Event Handler.
Read Event Handlers for more information and a list of all available Event Handlers.
Some event handlers are persistent (i.e. they stay attached to the unit, even after it dies and respawns).
Event Handlers


target addEventHandler [type, code]
target: Object or Arma 3 logo black.png2.10 Group
type: String - see Event Handlers for the full list of available options
code: Code or String - Code that should be executed when the Event Handler fires; executed in missionNamespace by default. Several Magic Variables are available:
  • Event Handler parameters are accessible via _this.
  • The Event Handler type is available as _thisEvent.
  • The Event Handler index is available as _thisEventHandler.
Return Value:
Number - The index of the added Event Handler. Indices start at 0 for each unit and increment with each added Event Handler.


Example 1:
_index = player addEventHandler ["Killed", {_this exec "playerKilled.sqs"}];
Example 2:
this addEventHandler ["Killed", { params ["_unit", "_killer"]; systemChat format ["%1 has been killed by %2.", _unit, _killer]; }];

Additional Information

See also:
removeEventHandler removeAllEventHandlers Event Handlers addMPEventHandler addMissionEventHandler BIS fnc addScriptedEventHandler


Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note
Posted on Jun 07, 2015 - 21:06 (UTC)
When using overridable EH, such as "InventoryOpened" and similar, where returning true allows to override default action, exitWith cannot be used to return value. So:
if (whatever) exitWith {true}; false;
Forget about it, will not work. Instead use:
if (whatever) then {true} else {false};
100% satisfaction guaranteed!