Maintenance script: UI Lua API import (WAR 1.4.8)

2026-10-16T19:52:15Z

UI Lua API import (WAR 1.4.8)

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{{LuaApi|group=Window}}
Removes a window's handler for a game event.

<pre>
WindowUnregisterEventHandler(windowName, eventId)
</pre>

== Arguments ==
;windowName : <code>string</code> – Name of the window that owns the handler.
;eventId : <code>number</code> – The event, usually a <code>SystemData.Events.*</code> value.

== Returns ==
Nothing.

== Details ==
* Removes the handler added with [[API:WindowRegisterEventHandler|WindowRegisterEventHandler]] for this window and event.
* If the window has no handler for the event, nothing happens.
* <code>eventId</code> is truncated to a whole number.
* The function needs at least two arguments and only reads the last two.

== Errors ==
* <code>Error in function call 'WindowUnregisterEventHandler': Window %s does not exist</code>

== Example ==
From <code>easystem_utils/source/datautils.lua</code>:
<pre>
function DataUtils.Shutdown ()
WindowUnregisterEventHandler ("Root", SystemData.Events.ITEM_SET_DATA_ARRIVED)
-- ...
end
</pre>

== See also ==
* [[API:WindowRegisterEventHandler|WindowRegisterEventHandler]]
* [[API:WindowUnregisterCoreEventHandler|WindowUnregisterCoreEventHandler]]

API:WindowUnregisterEventHandler - Revision history

Maintenance script: UI Lua API import (WAR 1.4.8)