I've not used it yet, but there's a module for doing that here:

https://github.com/simonh1000/file-reader

Note you have to enable native modules in your config, and you can't just
install it as a package as Elm packages don't allow native code.

On Sat, Nov 5, 2016 at 8:27 AM, Martin DeMello <[email protected]>
wrote:

> I'm a bit lost trying to put the pieces together for this. I have a web
> service that does file format conversion, and I want to use the
> binary->json converter to import a binary file into an elm frontend.
>
> Here's some code to illustrate what I want to achieve. I can call my
> webapp via
>
> $ curl --form "[email protected]" --form "from=binary" --form
> "to=json" http://localhost:1234/json
>
> and in my view I have
>
>   form [class "pure-form", id "convert-form"]
>   [ fieldset []
>       [ input [ type' "file" , class "pure-button"] []
>       , a [class "pure-button", onClick UploadFile] [text "Load"]
>       ]
>   ]
>
> From what I can tell, I'll need to go through the ports system both to
> upload the file and to attach the binary data to a POST request, but I'm
> not too familiar with javascript either, and I'm hoping this is something
> someone has already figured out for their own app.
>
> martin
>
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