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Updated online-offline-events.md
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John Kleinschmidt 2017-10-18 10:06:27 -04:00 committed by GitHub
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docs/tutorial/online-offline-events.md
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# Online/Offline Event Detection
Online and offline event detection can be implemented in the renderer process
using standard HTML5 APIs, as shown in the following example.
[Online and offline event](https://developer.mozilla.org/en-US/docs/Online_and_offline_events) detection can be implemented in the renderer process using the [`navigator.onLine`](http://html5index.org/Offline%20-%20NavigatorOnLine.html) attribute, part of standard HTML5 API.
The `navigator.onLine` attribute returns `false` if any network requests are guaranteed to fail i.e. definitely offline (disconnected from the network). It returns `true` in all other cases.
Since all other conditions return `true`, one has to be mindful of getting false positives, as we cannot assume `true` value necessarily means that Electron can access the internet. Such as in cases where the computer is running a virtualization software that has virtual ethernet adapters that are always “connected.”
Therefore, if you really want to determine the internet access status of Electron,
you should develop additional means for checking.
Example:
_main.js_
@ -78,13 +83,3 @@ _online-status.html_
</body>
</html>
```
**NOTE:** If Electron is not able to connect to a local area network (LAN) or
a router, it is considered offline; all other conditions return `true`.
So while you can assume that Electron is offline when `navigator.onLine`
returns a `false` value, you cannot assume that a `true` value necessarily
means that Electron can access the internet. You could be getting false
positives, such as in cases where the computer is running a virtualization
software that has virtual ethernet adapters that are always "connected."
Therefore, if you really want to determine the internet access status of Electron,
you should develop additional means for checking.