How to upload a file only on the client side?

Hi,

I defined a file upload. I do not want to send the file to the server, but instead directly show the content (txt file) to the user. How could I do this: getting the content of the file? What am I missing?

@UiField FormPanel form;
@UiField FileUpload upload;
@UiField Button submit;

form.setEncoding(FormPanel.ENCODING_MULTIPART);
form.setMethod(FormPanel.METHOD_POST);

@UiHandler("submit")
void onSubmit(ClickEvent event) {
    form.submit();
}

@UiHandler("form")
void onSubmitForm(SubmitCompleteEvent evt) {
    Sysout("this never executes: " + evt.getResults());
}

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