Dropdown Coroutine error

Hello. I got some problem.

I use Dropdown in panel and use event On value changed.

I setactive false panel with Dropdown. and get error.

Coroutine couldn't be started because the the game object 'Dropdown' is inactive!
UnityEngine.EventSystems.EventSystem:Update()


If i use standart button and setactive panel false i dont get this error.
How i can fix error when i use Dropdown?

Also i dont get error if destroy panel with Dropdown from Dropdown ( if i use on value changed ).





Before i deactivate panel.
I StopAllCoroutines(); from Dropdown. This not help too. I got the same error.
Please help.

 

Hello thanks for reply.

I'll make simple script.

Code (CSharp):

1.    
2.     public GameObject testPanel;
3.     public Dropdown testDropDown;
4.  
5.     public void TestActive()
6.     {
7.         testDropDown.StopAllCoroutines();
8.         testDropDown.enabled = false;
9.         testPanel.SetActive(false);
10.     }
11.  

And got the same Error.

I'll try use this with testDropDown.StopAllCoroutines(); and without and got same effect.

 

I never do this. But i'll try. Thanks for reply.

 

Hello again.

Bug ID 758873

I send project.
Sorry if make incorrectly bug report message.
Also i send additional information with screen and script in mail.

 

Hello, I am getting the same error. Any progress or at least workaround?

 

Hello Again. Thanks for reply. Sorry my late answer.

I'll try disable Dropdown in unity 5.3.4.f1 and get same error.
Dropdown still cant disable himself, or mb i use him wrong? I dont use any scripts.
How i can disable dropdown OnValueChanged?



Also i again put DropDown in Panel and Disable Panel from DropDown, and get same error.

 

Thanks i'll will try.

 

Hello again.
I write two simple scripts to enable disable DropDown.

First script work correctly.

Code (CSharp):

1. public class DropDownFirstUtility : MonoBehaviour
2. {
3.     #region public
4.     public Dropdown MyDropDown;
5.     #endregion
6.  
7.     public void Enable()
8.     {
9.         #region Enable
10.         MyDropDown.gameObject.SetActive(true);
11.         #endregion
12.     }
13.  
14.     public void Disable()
15.     {
16.         #region Disable
17.         StartCoroutine(DisableDropDown());
18.         #endregion
19.     }
20.  
21.     private IEnumerator DisableDropDown()
22.     {
23.         #region DisableDropDown
24.         yield return new WaitForSeconds(0.15f);
25.         MyDropDown.gameObject.SetActive(false);
26.         #endregion
27.     }
28. }

If i init OnValueChanged in Unity Editor all works fine.
I can disable and enable DropDown.

In second script i init OnValueChanged from script by AddListener.

Code (CSharp):

1. public class DropDownSecondUtility : MonoBehaviour
2. {
3.     #region public
4.     public Dropdown MyDropDown;
5.     #endregion
6.  
7.     #region private
8.     private List<string> TaskList;
9.     #endregion
10.  
11.     private void Awake()
12.     {
13.         #region Awake
14.         Init();
15.         #endregion
16.     }
17.  
18.     private void Init()
19.     {
20.         #region Init
21.         TaskList = new List<string>();
22.         MyDropDown.options.Clear();
23.  
24.         TaskList.Add("Commands");
25.         TaskList.Add("Utilize");
26.         TaskList.Add("Stop");
27.  
28.         foreach (var n in TaskList)
29.         {
30.             MyDropDown.options.Add(new Dropdown.OptionData() { text = n });
31.         }
32.  
33.         MyDropDown.transform.FindChild("Label").GetComponent<Text>().text = TaskList[MyDropDown.value];
34.  
35.         AddListener();
36.         #endregion
37.     }
38.  
39.     private void AddListener()
40.     {
41.         #region AddListenerAddBuildingsInQueue
42.         MyDropDown.onValueChanged.RemoveAllListeners();
43.         MyDropDown.onValueChanged.AddListener((value) => SetCommands());
44.         #endregion
45.     }
46.  
47.     private void SetCommands()
48.     {
49.         #region SetCommands
50.         switch (TaskList[MyDropDown.value])
51.         {
52.             case "Commands":
53.                 print("Commands");
54.                 break;
55.             case "Utilize":
56.                 print("Utilize");
57.                 Disable();
58.                 break;
59.             case "Stop":
60.                 print("Stop");
61.                 break;
62.         }
63.         #endregion
64.     }
65.  
66.     private void Disable()
67.     {
68.         #region Disable
69.         StartCoroutine(DisableDropDown());
70.         #endregion
71.     }
72.  
73.     public void Enable()
74.     {
75.         #region Enable
76.         MyDropDown.gameObject.SetActive(true);
77.         #endregion
78.     }
79.  
80.     private IEnumerator DisableDropDown()
81.     {
82.         #region DisableDropDown
83.         yield return new WaitForSeconds(0.15f);
84.         MyDropDown.gameObject.SetActive(false);
85.         #endregion
86.     }
87. }

All works fine until i'll try disable DropDown. If i disable him i cant enable him again.
I click on DropDown and nothing happend.



He dont response on my click, and nothing happend.
But if i doubleclick near him on empty space he response.

How i can fix it? Or i init wrong DropDown from script.

I hope you understand what i mean.

 

When i remove listener i add him again.

Code (CSharp):

1. MyDropDown.onValueChanged.AddListener((value) => SetCommands());

Code (CSharp):

1. MyDropDown.onValueChanged.RemoveAllListeners();

If i dont use RemoveAllListeners he start dublicate all events, when i make UI dynamic. Because sometimes i need reInit options.


But if i comment this line i still get same problem. DropDown dont response after i close him, and response if i click near him in empty space.
Its look like he drop option list and make they transparent.

 

Yes ofc, i make tested proj with two scripts.

I put empy object with script to scene, and make Button to ReEnable DropDown.

I add file to yandex disk

https://yadi.sk/d/ABp04bKmqtq3U


If you click to "Utilize" in DropDown you disable him, after this click on button to reenable him.

 

Yes thanks now all works fine, i thought what 0.15 ms enough.