How do I check if a child object exists?

Question

At certain points in my game the PlayerController/object picks up another gameObject which temporarily becomes a child of the player. (I say temporarily as the picked up object has a destroy by time script on it)

Anyway... how can I check if this child object is present on the parent?

???

Answer 1

Best Answer

Answer by sprawww · Mar 22, 2015 at 07:53 PM

 Transform[] ts = GetComponentsInChildren<Transform>();
         foreach(Transform t in ts)
         {
             if(//your condition here)
             {
                 //do something
             }
         }

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sprawww · Mar 23, 2015 at 08:55 AM 0

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Thanks for accepting. Also, depending on how expensive your if statement is, you might want to add a break; after //do something, as in:

 if(//your condition here)
 {
 //do something
 break;
 }

isteffy · Mar 11, 2016 at 11:34 AM 0

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This solution will find if the child exists but not if the child does not exist

Lo0NuhtiK · Mar 11, 2016 at 11:45 AM 2

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isteffy · 5 $$anonymous$$utes ago 0 This solution will find if the child exists but not if the child does not exist

The topic is "How do I check if a child object exists?" ...and if you check if something exists, then you'll learn the answer to either question.

Look in the fridge for a sammich. If there's one in there then you know one exists. If there isn't one in there, then one doesn't exist.

If DoesExist = true, then DoesNotExist = false.
If DoesExist = false, then DoesNotExist = true.

isteffy Lo0NuhtiK · May 21, 2016 at 08:28 PM 0

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Ah yes you are correct. I was not seeing the 'break;' in your loop which would halt the loop after finding the sandwich. my b +1 for you

afakul · Jul 31, 2021 at 11:25 AM 0

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the sadnese is i dont know how to put what in your condition here

rage_co afakul · Jul 31, 2021 at 01:05 PM 0

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what do you want to check for? if it's for children...you can simply check

 if(ts.Length != 0)
 {
   //Do Something
 }

this means that the statement will execute when any child exists

Answer 2

Answer by mjcollum · Aug 28, 2015 at 07:03 AM

old thread but for anyone looking

transform.childcount returns an int. if this is 0 it has no children.

http://docs.unity3d.com/ScriptReference/Transform-childCount.html

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Answer 3

Answer by Mickwa · Mar 22, 2015 at 07:48 PM

Maybe just comparing transform to null will solve Your problem? Example:

 using UnityEngine;
 using System.Collections;
 
 public class Test : MonoBehaviour
 {
 
     GameObject go;
     Transform t;
     void Start()
     {
         go = new GameObject();
         t = go.transform;
         Destroy(go, 2f);
     }
 
     void Update()
     {
         if (t == null) 
             Debug.Log("Object does not exist");
         else
             Debug.Log("Object exists");
     }
 }

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Answer 4

Answer by Riley Smit · Apr 21, 2016 at 11:38 AM

You can use transform.childCount

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Answer 5

Answer by JeffBrin · Jan 14 at 03:38 PM

Old thread but if anyone needs, you could use a try catch

 bool childExists = false;
 try
 {
     child = GetComponentInChildren<Transform>(); // Replace Transform with any other script that would only be on this child
     childExists = true;
 }
 catch{
 }

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How do I check if a child object exists?

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