Key detection is when you detect the event of pressing a key, or letting go of it.
Actually, there are two ways to do it. You could use UserInputService, or using ContextActionService. ContextActionService is useful for mobile support, like making a button that makes your character change colour.
--NOTE: If you're using key detection, it will only apply for one player, meaning it needs to be in a client --directory, like StarterGui, StarterPack, StarterPlayerScripts. --Method 1: local userInputService = game:GetService('UserInputService') userInputService.InputBegan:Connect(function(input,obj) local key = input.KeyCode if key == Enum.KeyCode.E and not obj then print('Player is pressing the E key') end end userInputService.InputEnded:Connect(function(input) local key = input.KeyCode if key == Enum.KeyCode.E then print('Player has let go of the E key') end end --Method 2: local contextActionService = game:GetService('ContextActionService') function EKey(actionName,inputState,obj) if not obj then if inputState == Enum.UserInputState.Begin then print('Player is pressing the E key') elseif inputState == Enum.UserInputState.End then print('Player has let go of the E key') end end end contextActionService:BindAction('PrintE',EKey,false,Enum.KeyCode.E) --Argument 1: Action name, Argument 2: Function to bind, Argument 3: Create touch button for mobile, Argument 4: Which key to bind
In method 1, InputBegan and InputEnded are both events, that are being connected to an anonymous function. In the function for InputBegan, it checks if obj is nonexistent. Obj is a variable that tells us whether the player is hovering over a gui, or typing in a textbox. And of course, it checks if the player is pressing the E key.
In method 2, it's making a function that checks if the inputState is Begin or End. It's self-explanatory, because it's Begin if you're pressing the key, and it's end when you let go. Then, it's binding it to when you're pressing E, binding it to the function EKey, calling the action EPrint.
Imagine if you wanted to make it so that when you pressed R with your gun equipped it would reload. You will need to use key detection! Or maybe when you press C, it will make you crouch! Still, you need to use key detection!