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Let’s say someone is writing a reply to an online forum on their iPhone when they lose connection.
Is it possible to use HTML5 local storage to save their submission and post it when they get connection back?
If so, how do I tell if the phone has a connection or not?
Yes you can by implementing your custom logic into the app.
To see if a connection is available you could either use
navigator.onLineflag (but it seems that is not completely reliable):Does Safari and/or WebKit implement the equivalent of window.navigator.online?
http://html5demos.com/offline
or try to load content from the internet and see if it’s possible or not:
Checking online status from an iPhone web app