Function Not Appearing In OnClick Editor

Question

I have just started working with Unity, so I’m experiencing all the thrills and joy of learning a new programming suite from the ground up. All I want to do is create at OnClick function and link it to my button. Here is the code I’ve got:

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

public class btnSceneSelect : MonoBehaviour
{
    public void LoadSceneSelect ()
    {
        SceneManager.LoadScene( 1 );
    }
}

Here is a screenshot of the LoadSceneSelect function NOT appearing for selection for use with the OnClick event. The only option that appears under Monoscript is “string name”:

75629-onclick.png1206×796 71 KB

I think we can all agree that LoadSceneSelect is a public void function with no parameters.

I would appreciate any insight that could be offered. Thank you!

Juneberry

Answer 1

Instead of selecting the C# class, select the GameObject that btnSceneSelect is attached to.

If btnSceneSelect is not attached to a GameObject, attach it to one (other than the button).

Arms

I imagine it should also be recommended that this "attached GameObject" be an EventsSystem. I take it that's what it's there for? Thanks!

– Juneberry

Also the method needs to have zero or one parameter, or it will not show up.

– Garibald

You can indeed attach it to the button itself and it works fine.

– Seato

Answer 2

Select the button as a gameobject instead of the script

i mean you have attached the script containing the script to that button

Drag that button into the field instead of the script

Also you can do it via script too

Unity Discussions – 26 Aug 14

Unity 4.6: GetComponent().onClick... how do you add an event to button click?

The problem is simple: new UI system has cool buttons, but if I want to really use them I need to be able to add onClick events by code. Why? Well if I know I can atach script to the button in the editor, but most of the stuff must be created after...

Riedel

Answer 3

I seen this so many times everywhere and doesnt help me.

I am using a game object with script attatched.

I can see the script name and a bunch of other functions but not the methods I put in the script.

They are public void and no parameters.

Im doing everything right cant get it to show up.

Legend

I solved my issue of the fonction not showing by adding a Static instance of my MenuManager script which allows it to be accessed by any other script and the OnClick Editor. Just adding theses two lines: public static MenuManager Instance; void Awake(){ Instance = this; }

– Tbilisi

Answer 4

Kinda late, but if anyone else is facing this issue, make sure that the function in your script is set to ‘public’ ( ie public void function() ) instead of just void funtion() which is sometimes set to private by default. Should work after that.

Dihedral

OMG that was a silly one but I guess pretty obvious once you know it... Thanks dude

– Slider

It also helps to ensure you have all required semi colons and no compile errors. I missed a compile error in the bottom left which is easy to miss since the error message is so small on a big monitor.

– Dieterich

Yeah, I thought it was only private if you wrote private before void. I guess not! thx for the idea.

– Taciturnity

Answer 5

When you clicked on On Click() little circle to add your Script, you need to be under the Scene tab, not the Assets tab. Hopefully this helps!

If this is the Happiecat vids, you may also need to change the coding in script.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;
  
public class SceneSelectButton : MonoBehaviour
{
    public void LoadSceneSelect()
    {
        SceneManager.LoadScene(1);
    }
}

That should be all you need to change to get buttons to work!

Cowrie

Your answer actually solved my problem. I was in Assets every time. Thanks a lot! :)

– Pavior

This answer helps. [165448-註解-2020-08-14-003101.png|165448]

– Metameric

thank you this worked!!!

– Indurate

This was the issue for me -- thank you!!!

– Knight

Answer 6

make sure that you attached the script to your game object because sometimes it gets removed without any reason

Dielle

Answer 7

Above solutions works depending upon your scenario.

My scenario: Prefab
I am trying to attach onClick for a button on (ThemeSelectorButton) which is part of my Prefab (ThemeSelectorGroup).

1. I dragged my C# script(ThemeSelectorButton.cs) to ThemeSelectorButton(in Hierarchy).
2. Now, this C# script appears as an added component in Inspector of this ThemeSelectorButton.
3. [Imp] Now, instead of dragging C# script from Project/Assets/Scripts, drag it from the newly added component(Script) formed in Step 2, onto None(Object) under “On Click” of the Button(in Inspector)

3rd step gives you all the public methods in dropdown and not just MonoScript.

147116-screenshot-2019-10-07-at-65625-am.png1896×1600 338 KB

Hyunhz

Answer 8

One more thing to note, if the function you want to use modifies any non-public (or otherwise out of scope) properties of the class, then it will be unavailable regardless of the function’s scope.

Madrigal

Answer 9

you need to drag and drop Game Object you attached the button to.
Example :
Button1 inside panel1
you have to drag and drop panel1 in OnClick inside button1 script.
because you attached the script to panel1
then you will find the Public functions only available in last one (which is the name of the script) of the listview

Prepotent

Answer 10

it can be work that your function to define void instead of any type

Staggs

Thank you so much! This was my problem. My function was defined to return bool instead of defined as void return.

– Norm

Answer 11

Certain functions won’t show up in the list. If your function has any non-primitive types in its parameter list, the button won’t be able to press it. It can take int, string, bool, float, and so on, including MonoBehaviour and its subtypes. But it doesnt work on any struct or enum type. It also accepts methods with no parameters.

Spellman

Answer 12

In my case,

The function not showing up on the onClick Editor is because my function is with two parameters.

//Two parameters case, not showing
public void myFunction(string value1, string value2)
{
      //myFunction...
}

Then I change to this, it works, but you have to pass in the value in combination and split it inside the function.

Example:

1. value1 = "something"
2. value2="another"
3. then pass it in one value="something|another"

public void myFunction(string value)
{
     string value1 = value.Split('|')[0];
     string value2 = value.Split('|')[1];
      //myFunction...
}

Cognoscenti

Answer 13

Hi guys, I know this is an old post, but for me what happened was that I was requesting a type Enum as the function’s first argument.
It only shows up if I change that to a more predictable type like string, int, etc. I’m guessing Unity doesn’t really know how to handle custom Enums in the UI.
Hope this helps other people with the same issue!

Gelsenkirchen

This was my issue, thanks! I had an enum as the parameter and it wouldn't show up until I changed it to a simple type.

– Alf

Answer 14

As Ironic as it may seem, I had to restart Unity for my function to appear on the OnClick() menu.

I use Hot Reload and I think that the function wasn’t detected because of it.

Estimative