Hello, I have a text box where you can donate points to your team. And obviously, the game will break if you donate a string to an int value. So, how can I make it possible to only be able to write numbers in the text box?
Please don't take this question down, I have looked everything up, and this is my last resort,
BTW THIS IS NOT A REQUEST, I JUST WANT TO KNOW WHAT STRING MANIPULATION I NEED TO USE AND HOW I USE IT!
Thank you.
SummerEquinox's answer probably works, but here's a much simpler way
TextBox:GetPropertyChangedSignal("Text"):Connect(function()
if tonumber(TextBox.Text) then
-- send the donation
else
TextBox.Text = "Enter a number to donate" -- do not send the donation
end
end)
tonumber is a Lua function that checks if the string can be turned into a number. It is related to tostring if you've heard of that
Note: tonumber returns nil if it can't convert the string to a number, but if it can then it returns the string converted to a number
Say you have a TextBox - you can allow only numbers (where num >0) to be typed in it with the following code:
function Format(t)
return t:gsub("%D", "")
end
script.Parent:GetPropertyChangedSignal("Text"):Connect(function()
script.Parent.Text = Format(script.Parent.Text)
end)
If you wanted to check the text afterwards - you could do:
script.Parent.FocusLost:Connect(function()
if string.match(script.Parent.Text, "%D+") then
print('Text is not a positive number')
script.Parent.Text = "TextBox"
end
end)
Respect
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6 comments
You should also mention to number returns nil if it cannot concert its arguments to a number. Good answer nonetheless
convert*
This is definitely the more ideal solution, I kind of jumped on string manipulation since he mentioned it. OP use this instead.
But what if I dont want to allow negative numbers either??
Should I just use: if newValue < 0 then...
Well, I think you would want newValue >= 0 but yeah that’s the way to do it