Type IPointerClickHandler expected Button received. i:0. Argument is out of range.

Hey,

Following my previous thread ( http://forum.unity3d.com/threads/button-action-with-arguments.263613/ )

I tried to format things a little bit like so :

Code (JavaScript):

1. var btnNames : List.<String> = new List.<String>() ;
2.  
3. function Awake ()
4. {
5.  
6.     btnNames.Add ( "Button1" );
7.     btnNames.Add ( "Button2" );
8.     btnNames.Add ( "Button3" );
9.  
10.     for( var k : int = 0; k < btnNames.Count ; k++ )
11.     {
12.         if( GameObject.Find(btnNames[k]) ) GameObject.Find(btnNames[k]).GetComponent(UI.Button).onClick.AddListener( function() { OnButtonClick(btnNames[k]); } );
13.     }
14.  
15. }
16.  
17. function OnButtonClick ( _which : String )
18. {
19.     switch ( _which )
20.     {
21.         case "Button1":
22.             print("Btn1");
23.         break;
24.  
25.         case "Button2":
26.             print("Btn2");
27.         break;
28.  
29.         case "Button3":
30.             print("Btn3");
31.         break;
32. }
33. }

But unfortenetely, when clicking a button, I got this error:

Type IPointerClickHandler expected Button received. i:0. Argument is out of range.
Parameter name: index
UnityEngine.EventSystems.EventSystem:Update()

Am I doing something wrong?

Thans in advance

 

Sorry about that, it's due to copy/paste into this forum, there was lot of things to re-arrange and I forgot that one.
The typo isn't in my script and it's compiling very well!

 

It appears UnityEvent.AddListener() takes a UnityAction as its parameter; perhaps that's where the error is? I'm using C#, so I can't immediately test this, but perhaps you might also get away with:

Code (csharp):

1. [...].onClick.AddListener( function(buttonParam) { OnButtonClick(btnNames[k]); } );

If it helps, I got nearly the exact same error message when I was feeding ExecuteEvents.Execute() the wrong type of EventData; perhaps you have some faulty code there instead?

 

Well, there is nothing more on the script nor in the project. But okay, I'll wait until the error become clearer! Thanks!

@Senshi : I don't know, but what I can say is that if I place a string directly ( OnButtonClick("test") ) instead of the value inside an array, it's working just fine.

 

Well, wasn't quick enough. If by any case you want / have time to have a look here it is.

As a workaround I used a similar script attached to every button GO and then check the name to manage actions.

 

I have the same issue using List too. I'm using the same code in 4.5 and it works there. Seems like a problem with List.

 

Actually I've tried with built in arrays and doesn't change a thing

 

Good stuff. I had alot of those in a complex GUI based on array lengths etc. The call was maddening as it told nothing about where it was or what scripts were associated with it etc. I has to go back in and put print() after each loop to see which loops were out of range when instantiating UI objects.

For the others..once I took care of out of range exceptions it worked and was not due to the UI.

 

Well well well, first, I have to tell that I really didn't understood why the making of specificaly 3 loops would have crash the thing but I tried anyway. I tried with 10 but same bug occured.

Then, I know just a few about closure, but I checked your link. The thing that I can relate is that if inside my loop, instead of using the array value at index ( array[ i ] ) , I use a temporary variable that I fill with this value, and THEN I pass this value to the function, at this time I only get the last occurence of the loop when print().

 

I managed to go around the problem by storing my vars in a GameObject which is not part of the Canvas/UI. Apparently, Canvas elements like panels, buttons and so on are not considered a GameObject.

 

gegebel could you please give an example? I'm running into this issue as well.

 

I first used several scripts and tried to access them via script, but when the scripts were attached to new UI stuff, I couldn't get any reference to them, always got "out of range" or other strange errors.
Now I created an empty GameObject with a script attached to it. Whenever I need a button to have a reference I can adjust it by adding a reference to my empty GameObject in the "On Click" part of the button in the Inspector.
Another possibility would be to use the "singleton" method by using public static variables instead of just public. Note that static vars are only available once though but can be referenced without using GameObject.Find (Which is a bad programming habit anyway).

 

Thank you for sharing Gegebel!

 

I have the same problems, can you help me out, describe how you add the reference

buttonClone.GetComponent<Button>().onClick.AddListener(delegate {myVoid(mystring);});

and i get weird errors. I'm getting crazy from errors with no sense

 

Wrapping the click handler in a try/catch and logging the resulting exception quickly found my problem...

Code (CSharp):

1.     public void OnPressed()
2.     {
3.         try {
4.             thing.DoYourJob();
5.         } catch (System.Exception e) {
6.             Debug.LogError(string.Format("OnPressed exception: {0}", e));
7.         }
8.     }