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Introduced with Operation Flashpoint: Resistance version 1.851.85Arguments of this scripting command don't have to be local to the client the command is executed onEffects of this scripting command are not broadcasted over the network and remain local to the client the command is executed on
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Adds event handler (EH) to the given object and returns EH handle. If EH has some data to return upon event (e.g. the "killed" EH will return an array with 2 elements: the killed unit, and the killer), it is passed in _this variable. Since Arma 3 v.1.63.137807 the EH handle is also stored in _thisEventHandler variable and is available during EH code execution.

For more information about event handlers and their types check the scripting topic Event handlers in this reference. You may add as many event handlers of any type as you like to every unit. For instance, if you add an event handler of type "killed" and one already exists, the old one doesn't get overwritten. Use removeEventHandler to delete event handlers.
Some event handlers are persistent (i.e. they stay attached to a unit, even after it dies and respawns). Arguments of this scripting command have to be local to the client the command is executed on "Killed" and "Hit" eventhandlers are executed where given unit is local.


object addEventHandler [type, command]
object: Object
[type, command]: Array
type: String - Event Handler type
command: Code or String - code that should be executed once the event occurs, by default executed in missionNamespace
Return Value:
Number - The index of the currently added event handler is returned. Indices start at 0 for each unit and increment with each added event handler.


Example 1:
_EHkilledIdx = player addEventHandler ["killed", {_this exec "playerKilled.sqs"}]
Example 2:
this addEventHandler ["killed", "hint format ['Killed by %1',_this select 1]"]

Additional Information

See also:
EventHandlers listaddMPEventHandlerremoveEventHandlerremoveAllEventHandlers
Event Handlers


Only post proven facts here. Report bugs on the Feedback Tracker and discuss on the Arma Discord or on the Forums.


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Posted on July 7, 2015 - 21:06 (UTC)
Killzone Kid
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!