Because Content-Types are so often wrong on the internet (particularly when
set to text/html or text/plain), browsers use
content-sniffing<http://mimesniff.spec.whatwg.org/>.
Because your response does not look like HTML, it might very-well be
sniffed as text/plain by the browser, which will then skip the
onSubmitComplete.
Try prepending "<html><body>" to your response so that browsers will
"sniff" it as text/html (or in other words, send back HTML, not something
that's only *labelled* as being HTML)
On Monday, November 12, 2012 1:11:48 PM UTC+1, Thomas Lefort wrote:
>
> I implemented a simple image uploader which relies on the form panel. I
> pass an image file via a filupload widget and a multipart encoding to the
> server which then processes the image, stores it on the disk and returns
> the image file path as a text/html response. On the client side I have an
> onSubmitCompleted event handler that sets the image widget url to the one
> returned by the servlet.
>
> The onSubmitCompleted handler is sometimes (actually quite often) not
> called. I checked with firebug, the servlet does return the right file
> path, the image is stored, etc... The servlet also gets fully executed with
> no error (checked with various traces). I have the behavior for (at least)
> FF16. I have the issue in hosted mode or in compiled ran locally (with the
> embedded jetty).
>
> Here's my servlet code:
>
> @Override
> protected void doPost(HttpServletRequest request, HttpServletResponse
> response) throws ServletException, IOException {
> response.setContentType("text/html");
> PrintWriter writer = response.getWriter();
> try {
> // default values for width and height
> int width = 50;
> int height = 50;
> InputStream filecontent = null;
> String saveFile = null;
> List<FileItem> items = new ServletFileUpload(new
> DiskFileItemFactory()).parseRequest(request);
> for (FileItem item : items) {
> if (item.isFormField()) {
> String fieldName = item.getFieldName();
> String fieldValue = item.getString();
> if(fieldName.equalsIgnoreCase("width")) {
> width = Integer.parseInt(fieldValue);
> }
> if(fieldName.equalsIgnoreCase("height")) {
> height = Integer.parseInt(fieldValue);
> }
> } else {
> String fieldName = item.getFieldName();
> saveFile = FilenameUtils.getName(item.getName());
> if(fieldName.equalsIgnoreCase("image")) {
> filecontent = item.getInputStream();
> }
> }
> }
> // check values
> if(filecontent == null) {
> throw new FileNotFoundException("no file provided");
> }
> // Process the input stream
> ByteArrayOutputStream out = new ByteArrayOutputStream();
> int len;
> byte[] buffer = new byte[8192];
> while ((len = filecontent.read(buffer, 0, buffer.length)) !=
> -1) {
> out.write(buffer, 0, len);
> }
>
> String imagePath = processAndStoreImage(out, saveFile, width,
> height);
> System.out.println(imagePath);
>
> // return the url of the file
> writer.println(imagePath);
>
> } catch (Exception e) {
> writeError(writer, "Error whilst processing and storing
> image.");
> } finally {
> writer.flush();
> writer.close();
> }
>
> }
>
> and the onSubmitHandler
>
> imageForm.addSubmitCompleteHandler(new
> FormPanel.SubmitCompleteHandler() {
> public void onSubmitComplete(SubmitCompleteEvent event) {
> final String result = event.getResults();
> // update thumbnail view with new image
> thumbnailImage.setUrl(result);
> Window.alert("YES");
> }
> });
>
>
>
>
>
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