PlayFramework: Ajax + Drag n' Drop + File Uplo

Question

Does anyone know of a way to upload a file via Ajax and using drag n' drop from the desktop that supports PlayFramework's ability to convert file uploads to a File object?

I've tried several different methods, and nothing works correctly.

Answer 1

Not really sure this will qualify as an answer since I'm not a hundred percent sure it will work. But it should work :)

If I understand you correctly, you want to drag files from the desktop and drop them in a drop zone somewhere in your browser. This triggers an ajax upload call to a play server.

I've got the second part of that working, using a straight jquery ajax post. The files are received just fine. For the first part, I'd try using the dnd support in html 5 (scroll down to Dragging Files):

http://www.html5rocks.com/tutorials/dnd/basics/

Answer 2

Here's my successful attempt:

Edit routes file and add

POST    /upload                                 Application.upload

Our controller is Application, I'll be using it to keep it simple.

Edit your Application controller class

public static void upload(String qqfile) {


if (request.isNew) {

    FileOutputStream moveTo = null;

    Logger.info("Name of the file %s", qqfile);
    // Another way I used to grab the name of the file
    String filename = request.headers.get("x-file-name").value();

    Logger.info("Absolute on where to send %s", Play.getFile("").getAbsolutePath() + File.separator + "uploads" + File.separator);
    try {

        InputStream data = request.body;


        moveTo = new FileOutputStream(new File(Play.getFile("").getAbsolutePath()) + File.separator + "uploads" + File.separator + filename);
        IOUtils.copy(data, moveTo);

    } catch (Exception ex) {

        // catch file exception
        // catch IO Exception later on
        renderJSON("{success: false}");
    }

}


renderJSON("{success: true}");
} 

Edit your Application.html in app/views/Application folder/package

#{extends 'main.html' /}
#{set title:'Multiple Uploads' /}

<div id="file-uploader">
    <noscript>
        <p>Please enable JavaScript to use file uploader.</p>
        <!-- or put a simple form for upload here -->
    </noscript>

    <script>
        function createUploader(){
            var uploader = new qq.FileUploader({
                element: document.getElementById('file-uploader'),
                action: '/upload',
                debug: true
            });
        }

        // in your app create uploader as soon as the DOM is ready
        // don't wait for the window to load
        window.onload = createUploader;
    </script>    
</div>

Edit your main layout: main.html, located in the app/views folder/package and add this line after jQuery

<script src="@{'/public/javascripts/client/fileuploader.js'}" type="text/javascript"></script>

Final notes Remember to download the script from AJAX Upload Valums, enjoy!

You can also grab the source here.

I tested it in different browsers it works for me at least. Credits to Riyad in Play! mailing list who hinted me about the request.body

P.S: I'm using the one I posted as a comment before

Edit The answer with code has been added as directed by T.J. Crowder, I agree :)

Answer 3

The simple upload part (not drag&drop just click on "upload a file") is not working with Ie7 & 8 (don't try others ie)

See getting Java Bad File Descriptor Close Bug while reading multipart/form-data http body