Now that we have our bank account back on screen, we will add an input field with the #number id (and of the number type) that captures the amount of money we want to deposit or withdraw from our account. We add a Deposit-Withdrawal button to initiate this action, and also an Add interest button to calculate and add interest to our account. Our screen now looks like the following screenshot:

Changing data screen

Here is the code of bank_terminal_s5.dart (declarations are left out for brevity):

void main() {
  bind_elements();                                   (1)
  attach_event_handlers();                           (2)
  disable_transactions(true);                        (3)
}
bind_elements() {
  owner = querySelector('#owner'');
  balance = querySelector ('#balance'');
  number = querySelector ('#number'');
  btn_other = querySelector ('#btn_other'');
  amount...