Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.
CloseFor some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.
CloseUnityEvent that is triggered when the Button is pressed.
Use UnityEvent.AddListener to extend the onClick click events. The added UnityAction is called when the Button press is released. A Button can have multiple listeners. As an example, in the script example below, btn3 can have TaskOnClick added as a second listener call.
Note that EventType.MouseDown and EventType.MouseUp are called prior to onClick.
// To use this example, attach this script to an empty GameObject. // Create three buttons (Create>UI>Button). Next, select your // empty GameObject in the Hierarchy and click and drag each of your // Buttons from the Hierarchy to the Your First Button, Your Second Button // and Your Third Button fields in the Inspector. // Click each Button in Play Mode to output their message to the console. // Note that click means press down and then release.
using UnityEngine; using UnityEngine.UI;
public class Example : MonoBehaviour { //Make sure to attach these Buttons in the Inspector public Button m_YourFirstButton, m_YourSecondButton, m_YourThirdButton;
void Start() { //Calls the TaskOnClick/TaskWithParameters/ButtonClicked method when you click the Button m_YourFirstButton.onClick.AddListener(TaskOnClick); m_YourSecondButton.onClick.AddListener(delegate {TaskWithParameters("Hello"); }); m_YourThirdButton.onClick.AddListener(() => ButtonClicked(42)); m_YourThirdButton.onClick.AddListener(TaskOnClick); }
void TaskOnClick() { //Output this to console when Button1 or Button3 is clicked Debug.Log("You have clicked the button!"); }
void TaskWithParameters(string message) { //Output this to console when the Button2 is clicked Debug.Log(message); }
void ButtonClicked(int buttonNo) { //Output this to console when the Button3 is clicked Debug.Log("Button clicked = " + buttonNo); } }