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Editorial Team
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Asked: 2026-05-25T06:55:50+00:00

How do I setup the basic switching of offline storage modes (offline/online) in Web

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How do I setup the basic switching of offline storage modes (offline/online) in Web SQL? I know there’s javascript

window.navigator.onLine. I can check the mode and then go through a process…

//All GET/POST performed with AJAX
//On Startup pulldown entire accessible database into offline storage (Doesn't seem secure IMO)
//if(read) pull from offline
//if(create, update, delete and online) pull from standard db, mark changes with offline expiration flag
//if(create, update, delete and offline) perform operation on offline storage, persist with POST when next online (change flag)

I’m asking if there is any OOB integration for these standard tasks?

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  1. Editorial Team

    The navigator.online property generally isn’t very useful – in a desktop browser all it does is hook into the File -> Work Offline menu. It may be more useful on an iPad, I don’t know because I don’t have one, and I’m guessing there’s not a File menu, but I would recommend you test.

    A common approach to this issue is to set up two easily distinguishable files in the fallback section of your manifest. Every time you want to connect back to the server attempt to fetch the file with AJAX and, in the callback, check it to see if you got the online file or the fallback, then branch accordingly.

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