How do I allow only specific characters in a textbox?

Help and Feedback Scripting Support
1

I am trying to make a keybind system that only allows specific letters to be entered into a textbox.

local UsableKeybinds = {"E","Q","F","V","1"}

How would I achieve this? I’ve looked already and it seems nothing could help.

2

You check everytime the text in the textbox changes and loop through the text. If the character is not allowed just remove it

3

I found a better way

local textBox = script.Parent

local BadCharacters = "da"

textBox.Changed:Connect(function(property)
	
	local t = textBox.Text
	
	t = string.gsub(t, "["..BadCharacters.."]", "")
	
	textBox.Text = t
	
end)

just add all the illegal characters to the BadCharacters variable

4

When the text changes :GetPropertyChangedSignal("Text") , loop through the text and if the character isn’t in the table table.find() change it using string.gsub

5

Don’t use textbox.Changed for this, you only want to check when the text changes.

6

This should work:

local UsableKeybinds = {"E","Q","F","V","1"}

local box = script.Parent

local function textChange()
    if table.find(UsableKeybinds, string.sub(-1,-1)) == nil then 
        box.Text = string.gsub(box.Text, ".?$", "")
    end
end