fileupload in gwt

[kim young ill]

hi there
what's the best approach to handle a simple fileupload in gwt ?
normally it would be a normal POST with File-Field, problem is that a post to a servlet will make the page "refresh", that means user will be redirect from current page. is there a lightweight-approach which doesnt require this ? possibly an iframe which contains the form ?

thanx

[Thomas Broyer]

FormPanel defaults to submitting to an hidden iframe; couple that with a FileUpload widget and you're done.

Have a look at the GWTUploader project too.

[kim young ill]

ahh,
thanx, i'll have a look.

On Tue, Feb 14, 2012 at 11:29 AM, Thomas Broyer <t.br...@gmail.com> wrote:

FormPanel defaults to submitting to an hidden iframe; couple that with a FileUpload widget and you're done.

Have a look at the GWTUploader project too.

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[thalys...@cardif.com.br]

Hello, Everybody

I found a good sample here http://fkgwt20.googlecode.com/svn/mvpproject/, this Project that have several kind of examples included file upload that you can use of GWT.

Internet   t.br...@gmail.com Enviado Por: google-we...@googlegroups.com 14/02/2012 08:29 Favor responder a google-we...@googlegroups.com

Para google-we...@googlegroups.com cc Assunto Re: fileupload in gwt

FormPanel defaults to submitting to an hidden iframe; couple that with a FileUpload widget and you're done.
Have a look at the GWTUploader project too.

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[Amith K Bharathan]

Create a servlet in server and config it in web.xml

[kim young ill]

anyone know how to handle a cancel-upload case ?
i guess if the client just cut the line. server will get IOException & can handle that. what about clientside with FileUpload widget (or i guess  Formpanel should do sth here )?

thanx

On Wed, Feb 15, 2012 at 5:56 AM, Amith K Bharathan <amithkb...@gmail.com> wrote:

Create a servlet in server and config it in web.xml

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[Brandon Donnelson]

I've found can trick the formpanel self target by setting the target to null. If you wanted to post and redirect to servlet this is how I'd do it. I've also sharded data and uploaded it over rpc using the file reader, but this api is still limited. 

    FormPanel form = new FormPanel((String) null); // (String) null gets rid of self target
    form.setAction(action);
    form.setMethod(FormPanel.METHOD_POST);

Brandon 

http://c.gwt-examples.com

[kim young ill]

thanx, i'll try it out. that's weird thou since its not documented anywhere.

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[JoyaleXandre]

You can use something this code, I think it's self explaining.

// Create a FormPanel and point it at a service.
    final FormPanel form = new FormPanel();
    form.setAction(GWT.getHostPageBaseURL() + YOUR_SERVLET_PATH_HERE);

    // To upload a file with the form we need to set to multipart MIME encoding and POST method.
    form.setEncoding(FormPanel.ENCODING_MULTIPART);
    form.setMethod(FormPanel.METHOD_POST);

    // Create a panel to hold all of the form widgets.
    panel = new VerticalPanel();
    form.setWidget(panel);

    // Create a FileUpload widget.
    final FileUpload upload = new FileUpload();
    upload.setName("file");
    panel.add(upload);

    [SOME OTHER CODE HERE IF YOU WANT]

    // Add a submit button.
    final Button btnSubmit = new Button("Upload package");
    btnSubmit.addClickHandler(new ClickHandler() {

        @Override
        public void onClick(ClickEvent event) {
        if (upload.getFilename().length() == 0)
            Window.alert("The file path must not be empty");
        else {
            form.submit();
          }
        }
    });
    panel.add(btnSubmit);