How to run lua function when joining a group?

[pbutter]

Hi

I just got into creating addons and I made one where it warns me if I have Glyph of Untamed Stars active when in a group, but this only runs OnLoad and I'm kind of lost as to where I can find information on how to get this to run when joining a group.

Thanks for you time!

[MunkDev]

Hey, use /eventtrace to track events in the game. Can't check right now, but using that tool you should be able to find which event fires when you join a group.

Here's a list of events:
http://wowprogramming.com/docs/events

Using something like this to catch it:

local function EventHandler (self, event, ...)
    if  self[event] then
        self[event](self, ...)
    end
end
 
local f = CreateFrame("FRAME", "MyAddon", UIParent)
 
function f:ADDON_LOADED(...)
    -- do stuff when loaded
end
 
function f:PLAYER_LOGOUT(...)
    -- do stuff when you log out
end
 
function f:PLAYER_STARTED_MOVING(...)
    -- do stuff when you start moving
end
 
f:RegisterEvent("ADDON_LOADED")
f:RegisterEvent("PLAYER_LOGOUT")
f:RegisterEvent("PLAYER_STARTED_MOVING")
f:SetScript("OnEvent", EventHandler)

[myrroddin]

GROUP_ROSTER_UPDATE is the event that fires. Note that it can fire twice, once when you join a group, and again when your group joins a larger group. The event also fires whenever someone joins, leaves, etc.

As always, check documentation and related APIs.

[pbutter]

Thanks guys!