Traverse up the hierarchy to find first parent with specific tag

Questions & Answers
1

I have a child object that needs to find the first parent object with a certain tag.

Parent Object ("Foo tag") \ Child Object \ Child Object | Child Object | Child Object \ Child Object (needs to traverse up the tree until it finds the "Foo tag"

I can't just do a find for the foo tag because I have multiple objects with that tag - I need to find the one that is a parent of this child.

5

Here is a solution in C# (tested and working in Unity 5.1):

public static GameObject FindParentWithTag(GameObject childObject, string tag)
{
   Transform t = childObject.transform;
   while (t.parent != null)
   {
      if (t.parent.tag == tag)
      {
         return t.parent.gameObject;
      }
      t = t.parent.transform;
   }
   return null; // Could not find a parent with given tag.
}
2

See comments above for answer. It is working great.

3

I hope this helps someone – and please correct me where I’m wrong!

// FIND PARENT WITH TAG
function findParentWithTag(tagToFind:String) {
	return findParentWithTag(tagToFind, this.gameObject);
}
function findParentWithTag(tagToFind:String, startingObject:GameObject) {
	var parent = startingObject.transform.parent;
	while (parent != null) { 
		if (parent.tag == tagToFind) {
			return parent.gameObject as GameObject;
		}
		parent = parent.transform.parent;
	}
	return null;
}
6

(Tested and working in Unity 5.1)

var elevatorComponent : Transform;

function Start() {

	elevatorComponent = transform.parent.parent;

}
7

if you had a commponent (like a c# class) on the gameobject that you want to find.
you could do transform.GetComponentInParent<ComponentName>().transform

this will search through all of the parents that this child is attached to

4

Imagine a form with three uls (as sections). Each section has several ‘li checkbox /li’ and the last one says Check/Uncheck All. Here is the code, which will change all checkboxes in same ul.

$(document).ready(function(){
  $('.check-all').change( function(){
    $(this).closest("ul").find('input[type=checkbox]').attr('checked', $(this).attr('checked') || false );
  });
});