Access function from script of all children?

Questions & Answers
1

Heya, I have an empty object called “AllTheDoors” that is the parent of every door in the game. Each door has a script called “DoorScript.js”, and within that, a function called recieveProperties(). How do I call this function for every child? I wrote this so far:

var DoorScripts : DoorScript[];
DoorScripts = GetComponentsInChildren(DoorScript) as DoorScript[];

for (var child : DoorScript in DoorScripts)
{
    child.recieveProperties(true, true, true);
}

The only issue is that I continually receive this error:

NullReferenceException: Object reference not set to an instance of an object

Please help as soon as possible.

2

You might try moving some of that code into an Awake() or Start() call, like so:

var DoorScripts : DoorScript[];

function Start()
{
	DoorScripts = GetComponentsInChildren(DoorScript) as DoorScript[];
	for (var child : DoorScript in DoorScripts)
	{
		child.recieveProperties(true, true, true);
	}
}

If that’s not the problem, try to figure out which reference(s) are null: the array itself, or its contents. You could, for example, add Debug.Log(child) inside the loop to list each child before operating on it.

3

Lol I actually just found the solution here: Unity - Scripting API: Component.GetComponentsInChildren

Instead of:
var DoorScripts : DoorScript;

I was supposed to put:
var DoorScripts : Component;

I was confused by a previous Unity Question. Bah, my bad. But thanks so much for your help anyway!

4

Bah, I was confused by another Unity Question. I found the solution here: Unity - Scripting API: Component.GetComponentsInChildren

Instead of:

var DoorScripts : DoorScript[];

I was supposed to put:

var DoorScripts : Component[];

Moral of the Story: Read the f-ing manual… -.-

But thanks to everyone else who helped, though! :slight_smile:

5

I actually just found the solution here: Unity - Scripting API: Component.GetComponentsInChildren

Instead of:

var DoorScripts : DoorScript[];

I was supposed to put:

var DoorScripts : Component[];

I was confused by a previous Unity Question. My mistake. Thanks everyone for your help, anyway!