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Detection whether a Vaadin UI/Window has been activated again

Gerhard Mueller
5 years ago Jan 17, 2017 5:31pm
Background:

I open a Lotus Notes document with a Link in my Vaadin Application.
In the Lotus Notes Document some updates will be done in my database.
When I activate my Vaadin Web application again (return to the browser tab of my Vaadin app.),
I need to show the database updates immediately in my vaadin application.
 
Is there a way to check whether the Vaadin application (or Browser-Tab) is activated again?
If it's possible with Javascript, how to start then the server side check to my database?
 
Thanks very much for any help.
Gerhard