The problem is `download` property that gets munged in advanced
compilation.
You can use `aset` to prevent it from being munged:
(aset lnk "download" filename)
or alternatively provide extern file to tell Closure compiler not to munge
it:
function HTMLLinkElement() {}
HTMLLinkElement.proptotype.download;
2015-02-15 3:35 GMT+02:00 Mike Thompson <[email protected]>:
> On Friday, February 13, 2015 at 6:05:37 PM UTC+11, Jensontech wrote:
> > I need to allow the user to save content generated by Clojurescript to
> their local drive.
> >
> > I do it using this code -
> >
> > (defn- save-file
> > [filename content]
> > (let [lnk (get-element-by-id "file-export-link")
> > blob (js/Blob. (js/Array. content) {:type "text/plain"})]
> > (set! (.-href lnk) (.createObjectURL js/URL blob))
> > (set! (.-download lnk) filename)
> > (.click lnk)))
> >
> > When the function runs it does a pseudo download to the named file. This
> works with ":optimizations :none".
> >
> > When I try the same thing with ":optimizations :advanced", instead of
> doing a download and prompting to open or save a file, it moves the browser
> to a URL like: "blob:null/d9bbcdab-7c87-....etc"
> >
> > I have tried Chas Emericks's url package https://github.com/cemerick/url
> to create the URL but it still doesn't work.
> >
> > Something is being munged by the optimization, but I am not sure what.
> > Does anyone have any ideas how to go about fixing this?
>
> I hesitate to offer advice here, because I'm just finding my way in these
> sort of matters myself but ...
>
> 1. You are using HTML5 APIs: Blob and URL.
> 2. Your code works with optimisation :none, but not :advanced
> 3. I conclude that advanced optimisation is munging the symbols.
> 4. Which means you need to include externs for this API for URL and Blob)
>
> This appears to be the right set of externs:
> https://code.google.com/p/closure-compiler/source/browse/externs/fileapi.js
>
> But at that point, I run out of knowing much. Because it is part of Google
> Closure, you'd think there was some way of pulling in that file.
>
> Background:
> http://lukevanderhart.com/2011/09/30/using-javascript-and-clojurescript.html
>
>
> Alternative thought ...
>
> Perhaps you could the `goog` wrappers for the "HTML5 API":
> http://docs.closure-library.googlecode.com/git/namespace_goog_fs.html
>
> (But I can't see how to get a Blob).
>
> (ns my.module
> (:require [goog.fs :as fs]))
>
> ;; later
> (.createObjectUrl fs blob)
>
> ;; or maybe
> (fs/createObjectUrl blob)
>
> ;; BUT no idea how to create a Blob in the first place.
>
> --
> Mike
>
>
>
> --
> Mike
>
>
>
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