Thank you Ravi Sharma for your fast answer.
I already was suggested to use this style:
// Add an event handler to the form.
form.addFormHandler(new FormHandler() {
public void onSubmit(FormSubmitEvent event) {
// This event is fired just before the form is submitted. We
can take
// this opportunity to perform validation.
if (tb.getText().length() == 0) {
Window.alert("The text box must not be empty");
event.setCancelled(true);
}
}
public void onSubmitComplete(FormSubmitCompleteEvent 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());
}
});
And now my application works ok...
But I'm having problem of sending responses from server. For example
if I want to tell my application that the file is too big please send
the image that is not bigger than 1mb.
I get something like:
<h2>HTTP ERROR 500</h2>
<p>Problem accessing /officemanagerver1/upload. Reason:
</p><pre> Expected a redirect, tried to write content instead.</
pre><p></p><hr><i><small>Powered by Jetty://</small></i><br>
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[2:20:18 PM AMST] Manvel Saroyan: Here is how I'm tring to send
information from server :
res.setContentType("text/plain");
res.getWriter().write("Hello, world");
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