Backpack ChildAdded Event not Triggered

Help and Feedback Scripting Support
#1

Hi,

In my code I want to print a message whenever a child has been added to the player’s backpack.

The problem is that the Backpack.ChildAdded event is not triggered when I put a tool in the players backpack at run-time

I’ve created the following “serverscript” and stored it under the “ServerScriptService”:

local Players = game:GetService("Players")

local function playerAdded(player)

	local backpack = player:WaitForChild("Backpack")
	
	local function printMessage()
		print("item added to backpack")
	end

	backpack.ChildAdded:Connect(printMessage)
end

Players.PlayerAdded:Connect(playerAdded)

Any idea what I could be doing wrong here?

Many thanks
Rim

8 Likes
Player tools don't load in the backpack
#2

First things first check if PlayerAdded event is being triggered becuase sometimes it’s not (when the first player joins the game it is possible that the script is being executed after they join and for that first player in game you have to execute the function you connect manually).

2 Likes
#3

Thanks for the quick reply.

I just double checked and the “PlayerAdded” event is definitely triggered when the player enters the game.

Also, I just noticed that when I put a “ChildAdded” event on the “Workspace” folder it works fine. So the issue just occurs on the player’s “Backpack”

This code works fine:

local Players = game:GetService("Players")

local function playerAdded(player)

	local backpack = player:WaitForChild("Backpack")
	
	local function printMessage()
		print("item added to Workspace")
	end

	game.Workspace.ChildAdded:Connect(printMessage)
end

Players.PlayerAdded:Connect(playerAdded)

This code does not work:

local Players = game:GetService("Players")

local function playerAdded(player)

	local backpack = player:WaitForChild("Backpack")
	
	local function printMessage()
		print("item added to backpack")
	end

	backpack.ChildAdded:Connect(printMessage)
end

Players.PlayerAdded:Connect(playerAdded)

Any ideas what I’m doing wrong here?

I’ve uploaded the file to hopefully make it easier to troubleshoot:
BackpackEventProblem.rbxl (16.6 KB)

Regards
Rim

#4

I wrote this to check whether the ‘Connection’ is being destroyed after the playerAdded function ends its execution and indeed the connection with the event is being lost. This is something that may help us but I still have not found the solution.

So basically somehow it’s getting disconnected after ‘wait(1)’.

local Players = game:GetService("Players")

local tab = {};

function playerAdded(player)
	local backpack = player:WaitForChild("Backpack")
		
	local function printMessage()
		print("item added to backpack")
	end
	local index = #tab + 1;
	tab[index] = backpack.ChildAdded:Connect(printMessage);
	
	spawn(function()
		while wait() do
			print(tab[index].Connected);
		end
	end)
	wait(1);
end

Players.PlayerAdded:Connect(playerAdded)
1 Like
#5

I found the solution, backpack is being destroyed and a new instance of backpack is created each time the character is added.

Once a character dies, the Backpack is removed and a new one will be created – populating it with the contents of StarterPack and StarterGear .

Source: Backpack | Documentation - Roblox Creator Hub
That is why our connection was disappearing.

local Players = game:GetService("Players")

function playerAdded(player)
	player.CharacterAdded:Connect(function()
		local backpack = player:WaitForChild("Backpack")
		
		local function printMessage()
			print("item added to backpack")
		end
		
		backpack.ChildAdded:Connect(printMessage);
	end)
end

Players.PlayerAdded:Connect(playerAdded)
26 Likes
Cant tell when a child is added in the backpack of the player?
#6

Many thanks for solving my problem Kacper!

#7

You’re welcome!
I learned something new too :relaxed:

1 Like