Catching get focused for UI InputField

Hi,

this is my first questions, so please excuse some mistakes ;) I already tried to find a answer for my question, but without any success.

Now to the problem. In my game you can navigate with WASD. I created with the new UI system an InputField to chat and send "console commands".

In my Controller.cs I already have a bool for "isInChat", which I want to send when I click into the InputFiled, but I can't find a function like "OnFocus" or such stuff.

I tried:

 void OnPointerClick(PointerEventData eventData)
 void OnDeselect(BaseEventData eventData)
 void OnPointerEnter(BaseEventData eventData)
 void OnPointerEnter(PointerEventData eventData)

I added it to differend GameObjects (InputField itself, InputField->InputField Input Caret and InputField->Text) but none of them react in any way.

Has someone an idea?

Thanks alot and with best regards

Alex

P.S.: Unity 5.3.1