Mouseover on dropdown list

Questions & Answers
1

Hi, when I use Dropdown on unity UI, a DropDown list is created with all the options that can be selected.

I was wondering if there was any way, we could know which option is currently being mouse-over?

Thanks

2

Check out the EventTrigger component.
The dropdown component has a Template Structure with an “Item” in it, this is like the prefab for the dropdown items which are created at runtime. You’ll attach the EventTrigger component to the Item and a script that will identify the dropdown item being hovered over (OnPointerEnter event).

Here’s a shot of the setup:

82196-eventtriggerexample.png
82196-eventtriggerexample.png709×341 36.6 KB

And here’s the EventTriggerTest.cs script:

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class EventTriggerTest : MonoBehaviour
{
	public Text label;
	public Toggle toggle;
	
	public void WhoAmI()
	{
		if (!label || !toggle)
		{
			Debug.LogError("please assign both the label and the toggle in the inspector");
			return;
		}

		Debug.LogFormat("label: {0}    toggle.isOn: {1}", label.text, toggle.isOn);
	}
}

The script (like all other UI event scripts) does not necessarily need to be attached to the same game object as the Event Trigger.

3

This is great!

And a way to also get the item info more directly in your handler is to make you event handler like so:

public void OnDropdownItemHighlighted(GameObject dropdownItem) //or Text dropdownItemText, etc.
{
   //do whatever you want with the item
}