When looking at downloading a file I always end up at the docs for chrome.downloads API, but this is only available for extensions and not packaged apps.
So how can I download a file in a Chrome packaged app?
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Pier
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Define "download". Do you want to give it to users or use it internally? – Daniel Herr Aug 25 '17 at 03:38
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Use it internally, and maybe later show it to the user. – Pier Aug 25 '17 at 04:41
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There's a bug report on this. Looks like one of the users found a hacky way to get it to work with an iframe - https://bugs.chromium.org/p/chromium/issues/detail?id=821219 – Michael Schwartz Mar 30 '18 at 07:42
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See the documentation for Referencing external resources.
In short, the recommendation is to save downloaded resources (e.g. images) as blob: URLs that you can store in any of the Storage APIs.
Xan
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1For anyone trying to figure this out check this other answer: https://stackoverflow.com/questions/34531428/chrome-apps-how-to-save-blob-content-to-filesystem-in-the-background – Pier Aug 26 '17 at 18:47
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I made this repo with an example app: https://github.com/PierBover/chrome-os-app-download-example – Pier Aug 26 '17 at 19:56