New answers tagged countdown
In your situation the count down might be unnecessary. Especially since the app is going mobile, the user would want as little clutter as possible on their (possibly tiny) screens. A solution to indicate that changes weren't saved back to the server would be a good addition as you and Yvonne suggest.
First, be sure to provide some feedback to the user: I like the "you are offline" message. Second, give the user the idea of being in-control: the button "reconnect" is good (even if an auto-re-connector technically would do the best job). Third: the system should try to re-connect automatically (as gmail does). Just in case the user is not in front of the ...
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