Save form with loader

Hi,

I have a simple form.
I would like when i click “save”, display a loader or text “in progress…” for example, because i do some operations and it takes sometimes a long time.
Is it possible to do this and how ?

Thanks
Guy
v9.6.018

HI,
nobody had to solve this “problem” ?
any help ?

Thanks
Guy
V9.6.018