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How do I check if a property exists? [Solved]
This prints true
1 | print(game.StarterGui.ScreenGui.Home.Contents.Archivable) |
This prints an error
1 | print(game.StarterGui.ScreenGui.Home.Contents.BrickColor) |
This prints nil
1 | print(game.StarterGui.ScreenGui.Home.Contents:FindFirstChild("Archivable")) |
This prints nil
1 | print(game.StarterGui.ScreenGui.Home.Contents:FindFirstChild("BrickColor")) |
Using . or [] reports an error if it doesn't exist. :FindFirstChild() only looks for children, not properties. I just need to see if a property on any given object exists.
EDIT:
As shown in the comments, if object:IsA("GuiBase") worked for what I was looking to do.
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There's no way to do this via a script, and no reason to. Just look on the wiki. Perci1 4988 — 8y
1
Well, I suppose you could use pcall, but there's still no reason to bother. Perci1 4988 — 8y
1
pcall is the only thing I can think of. GoldenPhysics 474 — 8y
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I am using a recursive loop to check if all the objects and their children have a certain property, and if they do, change it. GShocked 150 — 8y
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1
Instead of checking for the property, just check what object it is. Then change the property if it's the correct object. Perci1 4988 — 8y
0
Ya I just figured I'd see if this is something that exists in Rbx.Lua before resorting to that. I'll just have to check if each object is any variation of a GUI. GShocked 150 — 8y
2
You can do object:IsA("GuiBase"). It will return true if it's any GUI object. Perci1 4988 — 8y
0
OK thanks, that worked! GShocked 150 — 8y
2 answers
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1
1 | if object[property_name] then |
2 | print(property_name.. " exists!") |
3 | end |
or
1 | if pcall(function() return object[property_name] end) then |
2 | print("that property exists!") |
3 | end |
Edit:
The function to check for a property:
1 | function check4property(obj, prop) |
2 | return ({pcall(function()if(typeof(obj[prop])=="Instance")then error()end end)})[1] |
3 | end |
How to use:
1 | check4property(game.Workspace, "Size") |
2 | --returns true |
3 | check4property(game.Workspace, "Baseplate") |
4 | --returns false |
It also checks if the userdata it gets is actually a Property or a Instance.
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Does not work all of the time. For example, if a weld's Attachment 0 is nil, it will return nil, however Attachment0 is still a property. User#19006 0 — 6y
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I am using a solution with pcall, as seen below. Note hereGoesObjectToCheck is the variable name for the instance we want to check
01 | local function hasProperty(object, prop) |
02 | local t = object[prop] --[[this is just done to check if the property existed, if it did nothing would happen, if it didn't an error will pop, the object[prop] is a different way of writing object.prop, (object.Transparency or object["Transparency"])]] |
03 | end |
04 |
05 |
06 | local success = pcall(function() hasProperty(hereGoesObjectToCheck, "Transparency") end)) --[[this is the part checking if the transparency property/attribute]] |
07 |
08 | if success then |
09 | --[[your code]] |
10 | end |
Yes, I know it's 5 years old question.