TextMesh Pro ActivateInputField not working in OnEnable

EDIT: This actually appears to be a bug in TMP_InputField not InputField. Updated repro steps later in the thread.

I found an old issue (637877) that was supposedly fixed. However, when I call ActivateInputField in OnEnable the InputField does not receive focus. I end up having to set a flag in OnEnable and then call the same code in Update for it to work properly. Super ugly...

Am I doing something stupid here?

This doesn't work:

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3.  
4. public class Console : MonoBehaviour
5. {
6.     public GameObject inputField;
7.  
8.     private void OnEnable()
9.     {
10.         InputField field = inputField.GetComponent<InputField>();
11.         field.ActivateInputField();
12.     }
13. }
14.  

This however DOES work:

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3.  
4. public class Console : MonoBehaviour
5. {
6.     public GameObject inputField;
7.     private bool shouldEnable = false;
8.  
9.     private void OnEnable()
10.     {
11.         shouldEnable = true;
12.     }
13.  
14.     private void Update()
15.     {
16.         if(shouldEnable)
17.         {
18.             InputField field = inputField.GetComponent<InputField>();
19.             field.ActivateInputField();
20.             shouldEnable = false;
21.         }
22.     }
23. }
24.  

 

Don't know about that bug, but you can try 2 things, either try Canvas.Forceupdate before activating it.
Or if it still persists I've rewrote your code to be Update independent.
Also, there is no point in referencing inputfield as a gameobjct and then getting component, so I changed that too.

Code (CSharp):

1.     public InputField inputField;
2.  
3.     private void OnEnable()
4.     {
5.         Invoke("ActivateInputfield", 0.01f);
6.     }
7.  
8.     private void ActivateInputfield()
9.     {
10.         inputField.ActivateInputField();
11.     }

 

Still a little ugly to call Invoke, but better than what I had! Thanks for the refactor!

I'll submit a bug.

 

Just got back to this...

As I was creating a small project to reproduce this issue I realized it only occurs when using a TMP_InputField, not an InputField.

Code (CSharp):

1. using TMPro;
2. using UnityEngine;
3. using UnityEngine.UI;
4.  
5. public class Console : MonoBehaviour
6. {
7.     //public InputField inputField;
8.     public TMP_InputField inputField;
9.    
10.     private void OnEnable()
11.     {      
12.         inputField.ActivateInputField();
13.     }
14. }

There's a repo here with a project to reproduce the Issue:
https://github.com/baconhand/InputFieldOnEnableBug

Repro:

1. Run the project
2. Type some sample text to test the input is working
3. Press the TAB key
4. Press the TAB key again

Result: TMP_InputField isn't activated. Exact same code works with InputField.

 

I got this to work by moving the select() into Start(). Of course, this isn't the same as OnEnable but for a quick fix for people who don't actually enable or disable.

 

I am also having this issue, if the input field is a TMPro TMP_InputField then the functions ActivateInputField() and DeactivateInputField() simply don't work on them when calling it inside an event.
TMP_InputField.ActivateInputField() inside a function which is listening to an event--> Doesn't work.
It seems by the answers above that it indeed works in Update() and Start() functions, but not on OnEnable or other UnityEvents like the one I was trying to use. This seems to be a bug to be fixed

 

Still an issue in 2023, the above workaround code still works :

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3. public class Console : MonoBehaviour
4. {
5.     public GameObject inputField;
6.     private bool shouldEnable = false;
7.     private void OnEnable()
8.     {
9.         shouldEnable = true;
10.     }
11.     private void Update()
12.     {
13.         if(shouldEnable)
14.         {
15.             InputField field = inputField.GetComponent<InputField>();
16.             field.ActivateInputField();
17.             shouldEnable = false;
18.         }
19.     }
20. }