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Hover & click on the images for description


Sets given event handler of in-game UI. If EH function returns true, performed action is overridden. Event handlers available are:
  • "PrevAction" - mouse scroll up
  • "Action" - action key press
  • "NextAction" - mouse scroll down
In order to remove a previously added event handler, set it again with an empty code string "".
This is a "set" command, which means event handlers are not stackable and will replace previously set event handlers of the same type.
Arma 3
Since Arma 3 v1.50 the event handler receives an array of the selected/activated action's arguments in _this variable:

params ["_target", "_caller", "_index", "_engineName", "_text", "_priority", "_showWindow", "_hideOnUse", "_shortcut", "_visibleMenu", "_eventName"];

  • _target: Object - target object to which action is attached
  • _caller: Object - caller object, basically player
  • _index: Number - index of the action in action menu (0 - top most)
  • _engineName: String - engine based action name ("User" for user added actions)
  • _text: String - localized action plain text as seen by the caller
  • _priority: Number - action priority value
  • _showWindow: Boolean - action showWindow value
  • _hideOnUse: Boolean - action hideOnUse value
  • _shortcut: String - action shortcut name or ""
  • _visibleMenu: Boolean - action menu visibility - on first scroll or action press the menu is still invisible, the menu is shown but no action is performed
  • _eventName: String - event name
GUI Control - Event HandlersEvent HandlersInteraction


inGameUISetEventHandler [handlerName, code]
handlerName: String
code: String
Return Value:


Example 1:
inGameUISetEventHandler ["Action", "hint 'Lights, Camera, Action!'; true"]; sleep 10; inGameUISetEventHandler ["Action", ""]; // removes the "Action" EH
Example 2:
inGameUISetEventHandler ["PrevAction", "hint str _this; false"]; inGameUISetEventHandler ["NextAction", "hint str _this; false"]; inGameUISetEventHandler ["Action", "hint str _this; false"];
Example 3:
Deny any weapon disassembly:
inGameUISetEventHandler ["Action", " if (_this select 3 == 'DisAssemble') then { hint 'You are not allowed to do this'; true } "];
Example 4:
Detect explosive/mine placement:
private _onMagazineUse = ' params ["_target", "", "", "_action", "", "", "", "", "", "", "_event"]; if (_action == "UseMagazine") then { if (_event == "Action") then { _target spawn { waitUntil {!(all_magazines isEqualTo magazines _this)}; { 0 = all_magazines deleteAt (all_magazines find _x); } count magazines _this; hint format ["Magazine Used: %1", all_magazines select 0]; }; } else { all_magazines = magazines _target; }; }; false '; inGameUISetEventHandler ["PrevAction", _onMagazineUse]; inGameUISetEventHandler ["NextAction", _onMagazineUse]; inGameUISetEventHandler ["Action", _onMagazineUse];

Additional Information

See also:
isActionMenuVisible addEventHandler ctrlAddEventHandler displayAddEventHandler actionIDs actionParams addAction setUserActionText showHUD inputAction removeAction removeAllActions action enableWeaponDisassembly


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
AgentRev - c
Posted on May 12, 2016 - 20:51 (UTC)
In case of the "Action" event, (_showWindow || _visibleMenu) also denotes if the action is performed or not. For example, if the action menu is closed or fading off, pressing Spacebar will bring it up and trigger an "Action" event; in that case, _visibleMenu is false. But if the action menu is open, and Spacebar is pressed to perform the selected action, then _visibleMenu will be true. If _showWindow is true, then it means the action was performed, regardless of _visibleMenu.