Ignore UI element from clicking

FixMouseClicksForUI.cs

// ignore mouse clicks for UI
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class FixMouseClicksForUI : MonoBehaviour
{
    GameObject lastselect;

    void Start()
    {
        lastselect = new GameObject();
    }

    void Update()
    {
        if (EventSystem.current.currentSelectedGameObject == null)
        {
            EventSystem.current.SetSelectedGameObject(lastselect);
        }
        else
        {
            lastselect = EventSystem.current.currentSelectedGameObject;
        }
    }
}

UIIgnoreRaycast.cs

using UnityEngine;

// http://answers.unity3d.com/questions/816861/46-ui-image-is-capturing-clicks-how-to-prevent.html

public class UIIgnoreRaycast : MonoBehaviour, ICanvasRaycastFilter
{
	public bool IsRaycastLocationValid(Vector2 screenPoint, Camera eventCamera)
	{
		return false;
	}
}