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Revision as of 21:20, 2 April 2018 by Myonlake (talk | contribs) (Parameters)

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.


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)


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


Click to collapse [-]

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
Click to collapse [-]

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

See Also

Element events

Event functions