Events

OnEvent is a function that returns keys to use when hydrating or creating an instance. Those keys let you connect functions to events on the instance.

local button = New "TextButton" {
    [OnEvent "Activated"] = function(_, numClicks)
        print("The button was pressed", numClicks, "time(s)!")
    end
}

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Usage

To use OnEvent in your code, you first need to import it from the Fusion module, so that you can refer to it by name:

local Fusion = require(ReplicatedStorage.Fusion)
local OnEvent = Fusion.OnEvent

When you call OnEvent with an event name, it will return a special key:

local key = OnEvent("Activated")

When that key is used in a property table, you can pass in a handler and it will be connected to the event for you:

local button = New "TextButton" {
    [OnEvent("Activated")] = function(_, numClicks)
        print("The button was pressed", numClicks, "time(s)!")
    end
}

If you're using quotes '' "" for the event name, the extra parentheses () are optional:

local button = New "TextButton" {
    [OnEvent "Activated"] = function(_, numClicks)
        print("The button was pressed", numClicks, "time(s)!")
    end
}