What kind of feedback is appropriate to inform the user that he's actually offline?
I need the feedback to be simple, clear, understandable, user-friendly and corporate. But I don't know the best way to do it.
This is an expense report application.
Input fields are automatically saved at each modification. Users can create an expense report while offline, but some features do not work in this case. For example: calculating a cost per kilometer ride.
So I wish, in this case, inform them that they are offline and that their actions are still possible, but limited.
This is an application for all professionals, regardless of their business sector. So it will reach a wide audience.
I would like feedback for offline-mode corporate but not aggressive. I don't want it looking like an error message. The expense report creation must be pleasant for the user even if it's limited.
I don't know what kind of feedback message would do the best experience : should I use an icon? Should I use a simple feedback like "no connection" or a full explanation stating what the user can still do or not ?