OnElementDataChange

This event is triggered when an elementdata entry for an element changes. A client can perform this change on the element or it can be done using setElementData.

Parameters

string theName, var theOldValue

• theName: The name of the element data entry that changed
• theOldValue: The old value of this entry before it changed. The new value can be accessed using getElementData ( source, theName ).

Global parameters

• source: The source of this event is the element whose element data changed
• client: The client global variable is set to the client that called setElementData, or nil if it was called on the server.
• sourceResource: The resource which changed the element data. (Only works in versions above 1.3.4-5937)

Cancelling

This event cannot be cancelled using cancelEvent. To reverse the effect, use setElementData with the old value. See Example.

Example

Click to collapse [-]

Server

This example outputs a message to players when any of their element data values is changed.

function outputChange(dataName,oldValue)
	if getElementType(source) == "player" then -- check if the element is a player
		local newValue = getElementData(source,dataName) -- find the new value
		outputChatBox("Your element data '"..tostring(dataName).."' has changed from '"..tostring(oldValue).."' to '"..tostring(newValue).."'",source) -- output the change for the affected player
	end
end
addEventHandler("onElementDataChange",getRootElement(),outputChange)

Click to collapse [-]

Server

This example checks and possibly reverses an element's data change.

function checkChange(dataName,oldValue)
    if client then
        -- The client can only set 'special_thing' on its own player
        if dataName == "special_thing" and client ~= source then
            outputChatBox( "Illegal setting of "..tostring(dataName).."' by '"..tostring(getPlayerName(client)) )
            setElementData( source, dataName, oldValue ) -- Set back the original value
        end
    end
end
addEventHandler("onElementDataChange",getRootElement(),checkChange)

See Also

Element events

• onElementClicked
• onElementColShapeHit
• onElementColShapeLeave
• onElementDataChange
• onElementDestroy
• onElementDimensionChange
• onElementInteriorChange
• onElementModelChange
• onElementStartSync
• onElementStopSync

Event functions

• addEvent
• addEventHandler
• cancelEvent
• cancelLatentEvent
• getEventHandlers
• getLatentEventHandles
• getLatentEventStatus
• removeEventHandler
• triggerEvent
• wasEventCancelled