frame replacing

Hi,

There is a simple boolean variable which determines if some "all" debuffs are shown or only own debuffs(of the target).

So when = true then it will only show own debuffs
when = false it will show all debuffs

I want to make a modifier with the shift key to show all debuffs when the shiftkey is pressed and hide them again when shift is realeased.

if IsShiftKeyDown() then
 cfg.aura.onlyShowPlayer = false
 else
 cfg.aura.onlyShowPlayer = true
 end

This is my very simple solution for it which works. The problem here is though it only works on starting of the script. That is not very efficent because I would send my user into a loadingscreen.

OnUpdate should fix my problem here which will run this specific code everytime a frame gets rendered which is pretty handy and is what I want to accomplish.

So this is what I made

local function onUpdate(self,elapsed)
 if IsShiftKeyDown() then
 cfg.aura.onlyShowPlayer = false
 else
 cfg.aura.onlyShowPlayer = true
 end 
 end
 
 local shiftdebuffs = CreateFrame("frame")
 shiftdebuffs:SetScript("OnUpdate", onUpdate)

My problem is now that it doesn't work. I new to the onUpdate stuff and only copy pasted it from another addon I did which worked fine.
Right it goes straight to = false, which is only happening I think because it is the default.

thanks for the help

weird title, can't change it.