✓ ANSWER ACCEPTED

How to pass a table containing functions from client to server?

Asked Jan 1, 2019184 views3 answers

When I do a FireServer with a table containing functions as a parameter, the server script doesn't receive the functions.

Example :

Local script :

local test = {
	text = "text";
	function1 = function()
		print("function1")
	end;
}

local re = game.ReplicatedStorage:WaitForChild("RemoteEvent")

re:FireServer(test)

Server script :

game.ReplicatedStorage.RemoteEvent.OnServerEvent:Connect(function(player, test)
	print(test.text)
	test.function1()
end)

It does print the text, but it is unable to find the function.

The error message is : attempt to call field 'function1' (a nil value)

Am I doing something wrong? If not, is there a way to avoid this problem?

AnonymousJan 1, 2019

3 answers

✓ Accepted answer

Functions cannot be passed through remotes; if an attempt is made, the receiving remote will simply receive the argument as nil. There at least two workarounds for this issue:

Have a different remote for each function.
Have an argument that identifies which function to use.

Both of these solutions require you to define the functions on the receiving end:

-- Client:
remote_event:FireServer("func1")

-- Server:
local funcs = {}
function funcs.func1()
	print("func1")
end
function funcs.func2()
	print ("func2")
end
-- ...

remote_event.OnServerEvent:Connect(function(player, func)
	local f = funcs[func]
	if not f then
		return
	end
	f()
end)

AnonymousJan 1, 2019Permalink

2 comments

Would this still be the ideal solution if I'm passing an object (custom object) as a parameter? It feels wrong to rewrite methods. In the example, I used a normal table just to simplify the question

AnonymousJan 1, 2019#

What do you mean by custom object? An Instance, table, custom userdata, etc.?

AnonymousJan 1, 2019#

This is just an update to what Dandystan has posted. It is very common for you to need to pass arguments in a remote and you can use ... Variable Number of Arguments.

Example:-

-- Client:
remote_event:FireServer("func1", "hi") -- prints func1 hi
remote_event:FireServer("func1", "hi", "hi2") -- prints func1 hi
remote_event:FireServer("func2", "hi") -- prints func2 hi nil
remote_event:FireServer("func2", "hi", "hi2") -- prints func2 hi hi2

-- Server:
local funcs = {}
function funcs.func1(arg)
    print("func1", arg)
end
function funcs.func2(arg1, arg2)
    print ("func2")
end

-- server

remote_event.OnServerEvent:Connect(function(player, func, ...) --- ... varargs
    if  funcs[func] then
        funcs[func](...) -- pass args over to the function
    end
end)

AnonymousJan 1, 2019Permalink

Look into ModuleScripts. I've found them very helpful. Store your functions in the module. Unsure if this will help you though. If you dm me on Discord, I can help you better. Bark#4492. I'm in the SH discord.

AnonymousJan 1, 2019Permalink

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