gistfile1.java

		blogout = new Button("Registrovat");
		blogout.addClickHandler(new ClickHandler(){
			public void onClick(ClickEvent sender) {
				RequestBuilder request = new RequestBuilder(RequestBuilder.POST, GWT.getModuleBaseURL()
						+ "userhandling/createUser");
				request.setRequestData("username=" + user.getText() + "&password=" + pass.getText() + "&im=" + im.getText()
						+ "&email=" + email.getText());
				request.setHeader("Content-Type", "application/x-www-form-urlencoded");
				request.setCallback(new RequestCallback() {
					public void onError(Request request, Throwable exception) {
						Freza.infoPopUp("Komunikace se serverem selhala", Freza.ERR);
					}

					public void onResponseReceived(Request request, Response response) {
						JSONValue jvalue = JSONParser.parse(response.getText());
						JSONObject jobject = jvalue.isObject();
						if(jobject == null || jobject.get("result").isString().stringValue().equalsIgnoreCase("error")){
							Freza.infoPopUp("Chyba: "+jobject.get("desc").isString().stringValue(), Freza.ERR);
							return;
						} else if(jobject.get("result").isString().stringValue().equalsIgnoreCase("success")){
							// TODO [x] if registration successful
							Freza.loginListener.notifyLogout();
							tp.selectTab(0);
							Freza.infoPopUp("Registrovano, pockej na autorizaci adminem", Freza.OK);
						} else {
							Freza.infoPopUp("Pri registraci doslo k nejake nekalosti, zkus znova", Freza.WRN);
						}
					}
				});
				try {
					Log.info("Request - create user");
					request.send();
				} catch (RequestException e) {
					Freza.infoPopUp("Neco slo spatne... hodne", Freza.ERR);
					Log.error("register button", e);
				}
			}