How to use GetComponentsInChildren ( Example :- to print all children gameobject'sname )

Question

i started learning editor scripting....i streaked while my experimentation. kindly anyone help me to understand GetComponentsInChildren.

my project structure is like this

alt text

i want to print the names of all child(Top to Bottom) one by one...including Bottom (inactive child)

my code attached to Top is

public class Example : MonoBehaviour {

 public GameObject[] obj;
 void Awake(){
     obj = GameObject.GetComponentsInChildren<GameObject>();
     foreach(GameObject ob in obj)
     {
         Debug.Log(ob.name);
     }
 }

}

i tried and failed with this code...It will be very helpfull if anyone help me to get it :)

Answer 1

Best Answer

Answer by gjf · Jul 09, 2014 at 10:05 AM

look for the Transform component

 using UnityEngine;
 using System.Linq;
 
 public class Example : MonoBehaviour
 {
     public Transform[] obj;
 
     void Awake()
     {
         obj = GetComponentsInChildren<Transform>(true);
 
         foreach (var ob in obj.Where(ob => (ob != transform)))
         {
             Debug.Log(ob.name);
         }
     }
 }

the true in the GetComponents call will get active AND inactive.

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gamedevelopingboy · Jul 09, 2014 at 10:29 AM 0

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wow it working..thank you so much... :)

gamedevelopingboy · Jul 09, 2014 at 11:52 AM 0

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can u explain how .Where(ob => (ob != transform) work...im new to programming...

gamedevelopingboy · Jul 09, 2014 at 11:53 AM 0

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is => stands for lessthan or equal operator there?

gjf · Jul 09, 2014 at 12:14 PM 0

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it's LINQ - the following does the same:

 foreach (var ob in obj)
 {
     if (ob != transform)
     {
         Debug.Log(ob.name)
     }
 }

it checks to see whether the child object is actually the parent since GetComponentsInChildren returns that too.

apologies for complicating things for you.

gamedevelopingboy · Jul 09, 2014 at 12:31 PM 0

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thank you so much!!! :)

Answer 2

Answer by papabooish · Jul 09, 2014 at 10:30 AM

GameObject isn't a component, it's a container for components, so you can't search for it (as far as I know). Instead as said search for the transform component, since all GameObjects contain a transform (In fact the whole object hierarchy is located on the transform component)

 void Awake() {
     bool includeInactive = true;
     Transform[] ts = GetComponentsInChildren<Transform>(includeInactive);
     foreach(Transform t in ts)
         Debug.Log(t.name);
 }

This should find all Transforms, including the Transform of the GameObject that the script is attached to and print the name.

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Answer 3

Wiki

Answer by ruudlenders · Jul 09, 2014 at 10:30 AM

GetComponentsInChildren isn't the best way to loop through a parent-child structure. GetComponentsInChildren search for specific components, but a game object's name is not part of any component. For your specific example, I would do this:

 void Awake()
 {
     PrintNames(this.transform);
 }
 
 void PrintNames(Transform parent)
 {
     Debug.Log(parent.name);
     
     foreach (var child in transform)
     {
         PrintNames(child);
     }
 }

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How to use GetComponentsInChildren ( Example :- to print all children gameobject'sname )

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