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How do you connect to a function with an argument?

Asked by
Explosivesguy2 20
7 years ago

Sorry if this is something really easy to learn, but I just don't get it. I'm trying to connect to my function while passing along the argument for num1.

wait()
player = game.Players.LocalPlayer
MainGUI = script.Parent.ScreenGui
Scroll = MainGUI.ScrollingFrame
RStorage = game:GetService("ReplicatedStorage")
ClassFolder = RStorage.ClassFolder

-- Button List
Class1 = Scroll.Class1
Class1Event = ClassFolder.Class1Event


function mainEvent(num1)
    if num1 == 1 then
        Class1Event:FireServer()
    end
end

Class1.MouseButton1Down:connect(mainEvent(1))

It gives me the error: "Attempt to connect failed: Passed value is not a function" and afterwards "attempt to call a nil value"

The error is line 19

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Why would you want an argument which will be the same forever? Just use variables! hiimgoodpack 2009 — 7y
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I'm pretty new at scripting, how would you do this? Explosivesguy2 20 — 7y
0
Re-read my answer btw User#18043 95 — 7y

2 answers

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Answered by
User#18043 95
7 years ago
Edited 7 years ago

You cannot pass a value through the connection. You have to call the function with a parameter sent in through the parenthesis to send the value.

MainGUI = script.Parent.ScreenGui
Scroll = MainGUI.ScrollingFrame
Class1 = Scroll.Class1

function mainEvent(num)
    if num1 == 1 then 
        Class1Event:FireServer()
    end
end

function passparameter()
    mainEvent(1)
end

Class1.MouseButton1Down:Connect(passparameter)

Also :connect() is deprecated, ROBLOX is case-sensitive so it has to be :Connect()

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I forgot the :FireServer() doesn't require a parameter, only :FireClient() does. Sorry for my mistake. User#18043 95 — 7y
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it's ok lol, I didn't use the passparameter Explosivesguy2 20 — 7y
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Sociallycole, it does not matter on connect's capitalization. roblox simply ignores this. Albino_Albino 0 — 7y
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Answered by
Firedan1176 29
6 years ago
Edited 6 years ago

As @User#18043 mentioned, you can't directly pass arguments, but you can still do this:

Class1.MouseButton1Down:Connect(function() mainEvent(1) end)

If you're going to make multiple connections to MouseButton1Down on multiple, different Classes and want to utilize the same mainEvent function, this would be a solution as you can supply different arguments, such as in the case of GUI TextButtons:

local buttons = YouGui

buttons.FirstButton.MouseButton1Down:Connect(function() mainEvent(1) end)
buttons.SecondButton.MouseButton1Down:Connect(function() mainEvent(2) end)

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