How to override click on checkbox in mobile record page

I have a custom section that i've added to the mobile app.

This section record module has a check box.

When i "click" the checkbox, the record is automatically updated with the value of the checkbox (in the backend).

I need to update other fields on the record page, jest before it sends the update to the server.. basically what i need is to "catch" the "onClick / OnTouch" of the checkbox field -> update other field based on the checkBox field value -> (continue)send the update to the server..

Any Idea ? 

Thanks,

Eran.