How To Make Custom Events For Your Script

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#1

How do you create custom events?
That is what I’ll be covering in this tutorial and hopefully it will help you out.
If some parts do not make sense to you, I will explain at the end.

To start off, create a script, any kind (server, local, module).

Let’s make a variable and set it to a string.

local myVariable = "Hello world!"

Our goal is to make an event that fires whenever the variable is changed.
Let’s start off with creating the event.
Insert a BindableEvent as a variable, and set its Event property as another one.

local event = Instance.new("BindableEvent")
local Changed = event.Event

local myVariable = "Hello world!"

How does the event fire? Manually. This is obviously not the most efficient way, but it’s the easiest and events were not intended to detect variable changes anyway.

Pop in a :Fire() statement everytime you change the variable.

local event = Instance.new("BindableEvent")
local Changed = event.Event

local myVariable = "Hello world!"

myVariable = "Hi!"
event:Fire(myVariable)

myVariable = "Hello!"
event:Fire(myVariable)

That solves the firing, but how do we receive it?
Like any other event.

Let’s print myVariable everytime the event is called.

local event = Instance.new("BindableEvent")
local Changed = event.Event

local myVariable = "Hello world!"

Changed:Connect(function(value)
    print(value)
end)

myVariable = "Hi!"
event:Fire(myVariable)

myVariable = "Hello!"
event:Fire(myVariable)

And there you have it! Your own custom event. Keep in mind that events were not intended for detecting variable changes and was only used for tutorial purposes.

Review

local event = Instance.new("BindableEvent") --Creates the event
local Changed = event.Event --Bind the Event property to make it look like a real event

local myVariable = "Hello world!" --Set the initial value

Changed:Connect(function(value) --Changed is equal to 'event.Event'
    print(myVariable) --Print myVariable whenever it changes
end) --Close the event

myVariable = "Hi!" --Change the variable
event:Fire(myVariable) --Fire the event

myVariable = "Hello!" --Change the variable
event:Fire(myVariable) --Fire the event

If you still don’t understand, feel free to ask questions in the comments.

8 Likes
#2

Good tutorial, I would highly recommend to anyone following it that instead of setting the variable and then firing the event that you create a function for handling this.

Ex.

local function changeMyVariable(newValue)
    myVariable = newValue
    event:Fire(myVariable)
end

This makes it easier to code, and you are less likely to forget to fire the event.

3 Likes
#3

This could be really useful for creating events like .Touched, or PlayerEntered. This is really useful for modules

For anyone wondering how:

local module = {}
module.__index = module

function module.new(part)
    local self = setmetatable({}, module)
    
    self._TouchedEvent = Instance.new("BindableEvent")
    self.Touched = self._TouchedEvent.Event

    game.RunService.RenderStepped:Connect(function()
		local parts = workspace:GetPartsInPart(part)

		for _, hit in (parts) do
			self._TouchedEvent:Fire(hit)
		end
    
    end

    return self
end

return module

Script:

local touchedModule = require(script.Parent)

local touchedZone = touchedModule.new(workspace.Part)
touchedZone.Touched:Connect(function(hit)
	print(hit)
end

This basically creates a better touched event with OP’s method above

1 Like
#4

I did state that it is not recommended to use events for variable change detection, but yes, it works.