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I have an Office.js add-in which runs entirely on the client machine, served by localhost using Windows operating system. The manifests are in a local shared folder and all of the required files and javascripts are also stored locally (including the appropriate additional files specific for that client scripts) so theoretically the add-in has no need for internet access to work properly.

If the add-in is first loaded while it is online and internet cache is populated, then the offline behavior is as this answer describes it. However if Temporary Internet Files are deleted and the add-in is launched while it has no internet access, it loads the html markup, but then it hangs and seemingly it doesn't do anything. I inspected network traffic and there cannot be seen any attempts to load any scripts.

The add-in's web pages can be loaded with a browser without any problem even when the Temporary Internet Files are cleared entirely.

I know that Office.js add-ins are web based, but is there a way to make the add-in work totally offline, not depending on Temporary Internet Files when everything is provided locally?

Balázs Váradi
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  • How are you referencing Office.js? – Marc LaFleur Sep 25 '17 at 22:19
  • Have you tried using the Nuget package for Office-js or the experimental NPM [package](https://github.com/officedev/office-js). It should work as long as you host things locally and put the manifest on a shared location. – Sudhi Ramamurthy Sep 26 '17 at 10:01
  • Office.js is referenced via relative path from index.html (the entry html): That lib/office folder contains all files and folders from the master/dist directory of the NPM repository's current release (^1.0.0.0). – Balázs Váradi Sep 26 '17 at 13:19

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