Upload File with SmartGWT (LGPL)

Uploading file with SmartGWT is pretty simple - just use the build in DynamicForm component UploadItem. The problem comes in that moment when you need to obtain a notification from server that your upload finished successfully. There is no such an option (out-of-the-box) in LGPL version. There are two ways how to deal with it:

1. Use javascript JSNI call to receive a portion of a code (from server) triggering a function on client side. See this thread http://forums.smartclient.com/forum/smart-gwt-technical-q-a/5624-handling-smartgwt-upload-without-reloading?t=5477

2. Use a raw GWT widgets FormPanel and FileUpload item:

 
        final FormPanel form = new FormPanel();
        final FileUpload fu =  new FileUpload();
        final IButton btnUpload = new IButton("Nahraj");
        form.setEncoding(FormPanel.ENCODING_MULTIPART);
        form.setMethod(FormPanel.METHOD_POST);
        form.setAction(GWT.getHostPageBaseURL() + "upload");
        
        btnUpload.addClickHandler(new ClickHandler() {
			
			@Override
			public void onClick(ClickEvent event) {
				form.submit();
			}
		});
        
        VLayout holder = new VLayout();

        fu.setName("upload");
        holder.addMember(fu);
        holder.addMember(btnUpload);

        form.addSubmitHandler(new FormPanel.SubmitHandler() {
            public void onSubmit(SubmitEvent event) {
                btnUpload.setDisabled(true);
            }
        });
        
        form.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() {
            public void onSubmitComplete(SubmitCompleteEvent event) {
            	btnUpload.setDisabled(false);
            }
        });
        
        form.add(holder);
        

Correct - I get the objection that we should't mix GWT and SmartGWT widgets but we can do some exceptions sometimes, right? :-)