jQuery.ajax and image data encoding

Question

I'm trying to fetch an image stored at S3, via AJAX, which has been uploaded using InkFilePicker. InkFilePicker has a method called filepicker.read() which can be used to read the raw data from an image. However, it's quite limited so I want to use jQuery.ajax() instead. But it seems that they don't return exactly the same data.

The data received when using filepicker.read() looks like this when logging it to the console:

Data from filepicker.read()

When using jQuery.ajax() it looks like this:

Data from jQuery.ajax()

When using the data returned by jQuery.ajax() my other scripts seems to break (I'm extracting the EXIF data).

So, why does it look different at all? Does jQuery try to encode/decode the data somehow? Can I prevent that?

@Max No. I just want to fetch the raw image data so I can process it (in this case, extract EXIF data). — Linus
– Linus, Commented Oct 20, 2013 at 11:44
@Max, well I couldn't make it work when the image wasn't on the same server and inserted dynamically into the DOM. Instead I use this: github.com/mattiasw/ExifReader in combination with an ajax range request. — Linus
– Linus, Commented Oct 20, 2013 at 12:50

Kijewski · Accepted Answer · 2013-10-30 01:13:30Z

1

Ok, I had to add this to override the mimetype for some reason...

$.ajax({
...
  beforeSend: function(xhr) {
      xhr.overrideMimeType( "text/plain; charset=x-user-defined" )
  }
...
})

edited Oct 30, 2013 at 1:13

Kijewski

26.1k14 gold badges108 silver badges149 bronze badges

answered Oct 20, 2013 at 12:44

Linus

2,8193 gold badges31 silver badges45 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Linus Over a year ago

Yes. At least it makes the rest of my scripts work without complaining about bad image data...

Collectives™ on Stack Overflow

jQuery.ajax and image data encoding

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related