javascript - Firefox -- "FileReader is not defined" only when called from Web Worker - Stack Overflow

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In Firefox, the following code works correctly when run in the main browser thread as normal--

var fr = new FileReader();

..but when run from a web worker, the following error is thrown:

FileReader is not defined

The same code works fine in Chrome and Safari.

Any suggestions for supporting FileReader in a web worker in Firefox?

In Firefox, the following code works correctly when run in the main browser thread as normal--

var fr = new FileReader();

..but when run from a web worker, the following error is thrown:

FileReader is not defined

The same code works fine in Chrome and Safari.

Any suggestions for supporting FileReader in a web worker in Firefox?

• javascript
• firefox
• filereader
• web-worker
• fileapi

Share Improve this question Follow asked Mar 30, 2014 at 7:35 Stu BlairStu Blair 1,34311 gold badge1616 silver badges2424 bronze badges 3

• 1 Did you try using FileReaderSync instead of FileReader ? – adeneo Commented Mar 30, 2014 at 8:08
• @adeneo, yes, that does appear to be supported. Does FF not support asynchronous file reading? Are chrome/safari actually operating synchronously when I use FileReader? – Stu Blair Commented Mar 30, 2014 at 9:14
• 1 Well, FileReaderSync is only supported in workers, as you generally don't need asynchronous file reading in a worker, but I'm not sure why Firefox doesn't support the regular async FileReader in worker, I thought they did, but at least they support the synchronous version, so you can just use that as you don't need async behaviour in a worker anyway. – adeneo Commented Mar 30, 2014 at 9:17

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1 Answer 1

Sorted by: Reset to default 7

As adeneo pointed out, it seems that FileReader is simply not supported by Firefox in Web Workers. I was able to use FileReaderSync instead to acplish what I needed.

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