Albert,
Not sure if you are still stuck on this.. but if you make the following 2
changes this should work for you...
1) Change 'onInitialize' method to return 'form'. (It is returning
'vPanel' in your code.)
2) Add following line:
fileUpload.setName("myFile");
This should work.
On Thu, May 6, 2010 at 11:15 AM, Ajay Chitre <[email protected]> wrote:
> Adding some more info...
>
>
>
> In the debugger when I set a breakpoint in 'onInitialize' at this line:*
>
> RootPanel.get().add(form); *
>
> the form seems to be built properly as follows:
>
>
> <form method="post" enctype="multipart/form-data" action="
> http://127.0.0.1:8888/showcase/myFormHandler"; target="FormPanel_1"><table
> cellpadding="0" cellspacing="0"><tbody><tr><td style="vertical-align: top;"
> align="left"><div class="gwt-HTML"><b>Select a
> file:</b></div></td></tr><tr><td style="vertical-align: top;"
> align="left"><input id="gwt-debug-cwFileUpload" class="gwt-FileUpload"
> type="file"></td></tr><tr><td style="vertical-align: top;" align="left"><div
> class="gwt-HTML"><br></div></td></tr><tr><td style="vertical-align: top;"
> align="left"><button class="gwt-Button" tabindex="0" type="button">Upload
> File</button></td></tr></tbody></table></form>
>
>
> But under firebug, the form shows up as this...
>
> <form target="FormPanel_1" action="
> http://127.0.0.1:8888/showcase/myFormHandler";
> enctype="multipart/form-data" method="post"></form>
>
> So seems like there's something in the Showcase application framework
> that's causing this. Any ideas?
>
>
>
>
> On Wed, May 5, 2010 at 8:01 AM, Something Something <
> [email protected]> wrote:
>
>> Hello,
>>
>> I am writing a GWT application based on the 'Showcase' sample (
>> http://gwt.google.com/samples/Showcase/Showcase.html). I am trying to
>> get the 'File Upload' feature to work. I have changed the 'CwFileUpload'
>> class as follows:
>>
>> public Widget onInitialize() {
>> // Create a FormPanel and point it at a service.
>> * final FormPanel form = new FormPanel();*
>> form.setAction(GWT.getModuleBaseURL() + "*myFormHandler*");
>>
>> // Because we're going to add a FileUpload widget, we'll need to set
>> the
>> // form to use the POST method, and multipart MIME encoding.
>> form.setEncoding(FormPanel.ENCODING_MULTIPART);
>> form.setMethod(FormPanel.METHOD_POST);
>>
>> // Create a vertical panel to align the content
>> VerticalPanel vPanel = new VerticalPanel();
>> form.setWidget(vPanel);
>> // Add a label
>> vPanel.add(new HTML(constants.cwFileUploadSelectFile()));
>>
>> // Add a file upload widget
>> final FileUpload fileUpload = new FileUpload();
>> fileUpload.ensureDebugId("cwFileUpload");
>> vPanel.add(fileUpload);
>>
>> // Add a button to upload the file
>> Button uploadButton = new Button(constants.cwFileUploadButton());
>> uploadButton.addClickHandler(new ClickHandler() {
>> public void onClick(ClickEvent event) {
>> String filename = fileUpload.getFilename();
>> if (filename.length() == 0) {
>> Window.alert(constants.cwFileUploadNoFileError());
>> } else {
>> // Window.alert(constants.cwFileUploadSuccessful());
>> form.submit();
>> }
>> }
>> });
>> vPanel.add(new HTML("<br>"));
>> vPanel.add(uploadButton);
>>
>> // Add an event handler to the form.
>> form.addSubmitHandler(new SubmitHandler() {
>> @Override
>> public void onSubmit(SubmitEvent event) {
>> if (fileUpload.getFilename().length() == 0) {
>> Window.alert("Must select a valid file");
>> event.cancel();
>> }
>> }
>> });
>>
>> form.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() {
>> public void onSubmitComplete(SubmitCompleteEvent event) {
>> // When the form submission is successfully completed, this
>> // event is fired. Assuming the service returned a response of
>> type
>> // text/html, we can get the result text here (see the FormPanel
>> // documentation for further explanation).
>> Window.alert(event.getResults());
>> }
>> });
>> * RootPanel.get().add(form);*
>>
>> // Return the layout panel
>> return vPanel;
>> }
>>
>>
>> The code in *MyFormHandler *is given below (Note: This was directly
>> copied from the Google Appengine FAQ page):
>>
>> public void *doPost*(HttpServletRequest req, HttpServletResponse res)
>> throws ServletException, IOException {
>> try {
>> ServletFileUpload upload = new ServletFileUpload();
>> res.setContentType("text/plain");
>>
>> FileItemIterator iterator = upload.getItemIterator(req);
>> while (iterator.hasNext()) {
>> // IT NEVER GETS IN THIS LOOP
>> FileItemStream item = iterator.next();
>> InputStream stream = item.openStream();
>>
>> if (item.isFormField()) {
>> LOG.warning("Got a form field: " + item.getFieldName());
>> } else {
>> LOG.warning("Got an uploaded file: " + item.getFieldName() +
>> ", name = " + item.getName());
>>
>> // You now have the filename (item.getName() and the
>> // contents (which you can read from stream). Here we just
>> // print them back out to the servlet output stream, but you
>> // will probably want to do something more interesting (for
>> // example, wrap them in a Blob and commit them to the
>> // datastore).
>> int len;
>> byte[] buffer = new byte[8192];
>> while ((len = stream.read(buffer, 0, buffer.length)) != -1) {
>> res.getOutputStream().write(buffer, 0, len);
>> }
>> }
>> }
>> } catch (Exception ex) {
>> throw new ServletException(ex);
>> }
>> }
>>
>> When form is submitted, no "FileItems" (meaning form fields) are returned
>> in the Request object. I have tried moving the FormPanel to Showcase.java
>> and tried several combinations, but nothing is working :( Any ideas on
>> debugging this further will be greatly appreciated. Please help.
>>
>> Thank you.
>>
>>
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