Problem accessing variable for each child

Question

I'm trying to run through each child of a parent object and check if a variable is true.

I have this:

 for(var child : Transform in transform){
     if(child.gameObject.isGoalNode){
         //do stuff
     }
 }

isGoalNode is a variable in the script attached to each child individually. If I print the child.gameObject.isGoalNode, I get null.

I've also tried it through GetComponent:

 for(var child : Transform in transform){
     var childScript = GetComponent(RepairMiniGame);
     print(childScript.isGoalNode);
     if(child.gameObject.isGoalNode){
         //do stuff
     }
 }

Which turns up a NullReferenceException.

I'm sure I'm just missing something in the logic, so I thought someone here might know what I'm doing wrong.

Thank you!

Answer 1

You are accessing the component but you are not using it.

 var someScript : ExampleScript; // Declare your type
     someScript = GetComponent (ExampleScript); // Get the component
     someScript.DoSomething (); // Access a variable in that component

If you use GetComponent() it will look for the component attached to the GameObject you are calling it from. Which is not what you want.

In your case it would be something like:

     for ( var i = 0; i < number of children here; i++ )
     {
         var childScript = gameObject.transform.GetChild(i).GetComponent(RepairMiniGame);
              if ( childScript.isGoalNode )
              {
                 Debug.Log( childScript.gameObject.name );
                 
                 //Do Something
             }
 
     }

Where i is the index of the current loop and i < 3 if you have 3 child objects. Remember your first child is at index 0.

Edit: While I was whiping this up quickly I failed noticed that the order wasn't determined by the hierarchy. This shouldn't be a problem if you are just looping through them all.

*Edit: Remember isGoalNode has to be a public bool to access it.

Hope this helps.

Problem accessing variable for each child

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