Help me!!!

[quochuynh67]

Which are lines of code you handle when user click on clean button on the keybeard to focus the previous pin box?

[MarcelGarus]

The boxes themselves don't have any concept of "focus". Rather, the whole code input is treated as one single input (and it also uses one single input under the hood).
Just, the "actual" input is hidden and every time its content changes, the code elements are rebuilt.