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Updated online-offline-events.md

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Added more info, to clarify things.
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Sarthak Tripathi 2017-10-18 16:28:18 +05:30 • committed by GitHub
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docs/tutorial/online-offline-events.md
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# Online/Offline Event Detection # Online/Offline Event Detection
Online and offline event detection can be implemented in the renderer process Online and offline event detection can be implemented in the renderer process
using standard HTML5 APIs, as shown in the following example. using standard HTML5 NavigatorOnLine API.
The navigator.onLine attribute returns `false` if the user agent will not contact the network when the user follows links or when a script requests a remote page (or knows that such an attempt would fail) i.e. definitely offline (disconnected from the network) and must return `true` otherwise.
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_ _main.js_
@ -78,13 +84,3 @@ _online-status.html_
</body> </body>
</html> </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.