Making a simple addon need event help

[Spawnova]

I'm making a simple addon to check my pets health and see if it's below 80% but i'm stuck on what event i should use to check it's health

i'm very newby to lua and have only made one other addon i get the jist of it but choosing what events i should use is still a bit difficult

[Xrystal]

UNIT_HEALTH with arg1 being "pet"
http://wowprogramming.com/docs/events/UNIT_HEALTH

And then use GetUnitHealth("pet")
http://wowprogramming.com/docs/api/UnitHealth

This is of course you are talking about hunter pets. If you are talking about the critter pets these are listed elsewhere on the same site under pet battle.

[Haleth]

UnitHealth, not GetUnitHealth.

Also a good idea is to check if the unitID returned by UNIT_HEALTH is that of the unit you're interested in before you do anything else.

[Dridzt]

local eventframe = CreateFrame("Frame")

eventframe:SetScript("OnEvent", 
	function(self,event,...)
		return self.event and self.event(...)
	end)
	
eventframe:RegisterUnitEvent("UNIT_HEALTH_FREQUENT","pet")

function eventframe.UNIT_HEALTH_FREQUENT(...)
	local hpRatio = UnitHealth("pet")/UnitHealthMax("pet") < 0.8 and print("Pet Health Low!")
end

[Xrystal]

Originally Posted by Haleth UnitHealth, not GetUnitHealth. Also a good idea is to check if the unitID returned by UNIT_HEALTH is that of the unit you're interested in before you do anything else.

Oops so it was. Erm, it's 2am, guess I misread it with my tired eyes. Yeah that might work. Thanks haleth.

[Spawnova]

Ok, I went over everything you guys posted and it really helped alot!

Thanks Dridzt your code made it easier for me to understand what i needed to change and now everything works fine =D

and thanks everyone else all very helpful =)