How would you reference a player's GUI from a script inside the character?

Help and Feedback Scripting Support
#1

I’m trying to create a system where if a script detects a RopeConstraint in the HumanoidRootPart, it will turn a GUI frame green, and if not, red. But, I keep getting the error, Workspace.godtrek102playz.LocalScript:6: attempt to index nil with 'ScreenGui'

Here’s the code.

rope = script.Parent.HumanoidRootPart:FindFirstChild("RopeConstraint")
name = script.Parent.Name
if rope then
game.Players.name.PlayerGui.ScreenGui.Frame.BackgroundColor3 = Color3.fromRGB(255,0,0)
elseif not rope then
game.Players.name.PlayerGui.ScreenGui.Frame.BackgroundColor3 = Color3.fromRGB(0,255,0)
end

#2

Maybe use .LocalPlayer?

game.Players.LocalPlayer.PlayerGui.ScreenGui.Frame.BackgroundColor3 = Color3.fromRGB(255,0,0)
Optimization

  1. Use game:GetService() rather than using the dot operator.
    Example:
    Use game:GetService("Players") instead of game.Players. This allows to eliminate possible errors and helps you to access the services even if they are renamed.

  2. I see you using the Frame object multiple times, so declare it as a variable.

  3. Try using ternary operations if you understand them.

local rope = script.Parent.HumanoidRootPart:FindFirstChild("RopeConstraint")
local frame = game:GetService("Players").LocalPlayer.PlayerGui.ScreenGui.Frame

frame.BackgroundColor3 = rope and Color3.fromRGB(255, 0, 0) or Color3.fromRGB(0, 255, 0)
1 Like
#3

I tried the LocalPlayer fix to replace
game.Players.name.PlayerGui.ScreenGui.Frame.BackgroundColor3 =
but all it does is just turn the icon green when it’s supposed to be red and doesn’t change when a RopeConstraint is added to the HumanoidRootPart.

#4

If you have the character all you need to do is use:

local player = game.Players:GetPlayerFromCharacter(character)

Then to get plrgui

local plrGui = player.PlayerGui

#5

rope = script.Parent.HumanoidRootPart:FindFirstChild("RopeConstraint")
local player = game.Players:GetPlayerFromCharacter()
local plrGui = player.PlayerGui
if rope then
plrGui.ScreenGui.Frame.BackgroundColor3 = Color3.fromRGB(255,0,0)
elseif not rope then
plrGui.PlayerGui.ScreenGui.Frame.BackgroundColor3 = Color3.fromRGB(0,255,0)
end
What should I put in place of “character”? It gives me the error “Unknown global ‘character’” If I leave it blank, the script doesn’t work.

#6

Put script.Parent in the place of character

#7

You can get the Player using the :GetPlayerFromCharacter function. Here is an example:

local character = script.Parent
local player = game:GetService("Players"):GetPlayerFromCharacter(character)
local rope = script.Parent.HumanoidRootPart:FindFirstChild("RopeConstraint")
local RopeName = script.Parent.Name

if player then
if rope then
player.PlayerGui.ScreenGui.Frame.BackgroundColor3 = Color3.fromRGB(255,0,0)
else
game.Players.name.PlayerGui.ScreenGui.Frame.BackgroundColor3 = Color3.fromRGB(0,255,0)
end
end

The function above gets the player and all the folders involving the player using the API GetPlayerFromCharacter. You can read more about the API here.

#8

local character = script.Parent
local player = game:GetService("Players"):GetPlayerFromCharacter(character)
local rope = script.Parent.HumanoidRootPart:FindFirstChild("RopeConstraint")
if player then
if rope then
player.PlayerGui.ScreenGui.Frame.BackgroundColor3 = Color3.fromRGB(255,0,0)
else
player.PlayerGui.ScreenGui.Frame.BackgroundColor3 = Color3.fromRGB(0,255,0)
end
end
Again, this just turns the frame green and no change in color is made when a RopeConstraint gets attached. I might just post the .rbxm file with all the components since I’m quite lost here.

#9

If you want the UI to be updated upon something being changed, in your case a RopeConstraint added as a child of HumanoidRootPart, you need to listen to that change via an event and then update the UI.

Try:

local frame = game:GetService("Players").LocalPlayer.PlayerGui.ScreenGui.Frame
local hrp = script.Parent.HumanoidRootPart

local function updateUI()
    local rope = hrp:FindFirstChild("RopeConstraint")
    frame.BackgroundColor3 = rope and Color3.fromRGB(255, 0, 0) or Color3.fromRGB(0, 255, 0)
end

hrp.ChildAdded:Connect(updateUI)
updateUI()