How to reopen/prevent closing of ControlsFX LoginDialog on failed login? - javafx-8

Question

In my application, the first I do is request the user to login using the controlsFX LoginDialog. If the login is successful, I display the application, however if it fails the login window will close.
I would rather the login window stay open to allow the user to attempt to login again.
public void start(Stage stage) throws Exception {
LoginDialog ld = new LoginDialog(new Pair<String, String>("", ""), new Callback<Pair<String,String>, Void>() {
#Override
public Void call(Pair<String, String> info) {
boolean success = login(info.getKey(), info.getValue());
if(success){
openDriverWindow(stage);
}else {
//Display error message
}
return null;
}
});
ld.show();
}
If the login is unsuccessful, the dialog closes - which requires the user to reopen the application.

Answer 1

You can use Dialog from JDK8u40 which will be released at march 2015 or use dialogs from ConrolsFX (openjfx-dialogs-1.0.2). There is a code to implement Dialog which will not be closed until authentication is not passed.
// Create the custom dialog.
Dialog<Pair<String, String>> dialog = new Dialog<>();
dialog.setTitle("Login Dialog");
dialog.setHeaderText("Look, a Custom Login Dialog");
dialog.setGraphic(new ImageView(this.getClass().getResource("login.png").toString()));
// Set the button types.
ButtonType loginButtonType = new ButtonType("Login", ButtonData.OK_DONE);
dialog.getDialogPane().getButtonTypes().addAll(loginButtonType, ButtonType.CANCEL);
// Create the username and password labels and fields.
GridPane grid = new GridPane();
grid.setHgap(10);
grid.setVgap(10);
grid.setPadding(new Insets(20, 150, 10, 10));
TextField username = new TextField();
username.setPromptText("Username");
PasswordField password = new PasswordField();
password.setPromptText("Password");
grid.add(new Label("Username:"), 0, 0);
grid.add(username, 1, 0);
grid.add(new Label("Password:"), 0, 1);
grid.add(password, 1, 1);
// Enable/Disable login button depending on whether a username was entered.
Button loginButton = (Button)dialog.getDialogPane().lookupButton(loginButtonType);
loginButton.setDisable(true);
**// Prevent closing dialog if not authenticated**
loginButton.addEventFilter(ActionEvent.ACTION, (event) -> {
if (!authenticated()) {
event.consume();
}
});
// Do some validation (using the Java 8 lambda syntax).
username.textProperty().addListener((observable, oldValue, newValue) -> {
loginButton.setDisable(newValue.trim().isEmpty());
});
dialog.getDialogPane().setContent(grid);
// Request focus on the username field by default.
Platform.runLater(() -> username.requestFocus());
// Convert the result to a username-password-pair when the login button is clicked.
dialog.setResultConverter(dialogButton -> {
if (dialogButton == loginButtonType) {
return new Pair<>(username.getText(), password.getText());
}
return null;
});
Optional<Pair<String, String>> result = dialog.showAndWait();
result.ifPresent(usernamePassword -> {
System.out.println("Username=" + usernamePassword.getKey() + ", Password=" + usernamePassword.getValue());
});
this example was given from this article where you can find many useful examples

Answer 2

Try this:
public class Main extends Application{
private boolean login(String key, String value){
Pair loginData = new Pair<String, String>("test", "test");
if (loginData.getKey().equals(key) && loginData.getValue().equals(value)) {
return true;
}
else {
//Вывести Alert.
Platform.runLater(new Runnable() {
#Override
public void run() {
try {
Alert alert = new Alert(Alert.AlertType.ERROR, "Вы ввели неправильное имя или пароль");
alert.setTitle("Error");
alert.showAndWait();
} catch (Exception e) {
e.printStackTrace();
}
}
});
return false;
}
}
#Override
public void start(Stage primaryStage) throws Exception {
primaryStage.setTitle("Terminal Kuban-electro");
getLogin(primaryStage);
primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>() {
#Override
public void handle(WindowEvent t) {
System.exit(0);
}
});
}
private void getLogin(Stage primaryStage){
LoginDialog ld = new LoginDialog(new Pair<String, String>("", ""), new Callback<Pair<String, String>, Void>() {
#Override
public Void call(Pair<String, String> info) {
boolean success = login(info.getKey(), info.getValue());
if (success) {
Scene scene = null;
try {
scene = new Scene(FXMLLoader.load(getClass().getClassLoader().getResource("fxml/main.fxml")));
primaryStage.setScene(scene);
primaryStage.show();
} catch (IOException e) {
}
} else {
getLogin(primaryStage);
}
return null;
}
});
ld.setHeaderText("Введите имя пользователя и пароль");
ld.setTitle("Авторизация");
ld.show();
}
public static void main(String[] args) throws MalformedURLException {
//Инициализация формы в потоке
Thread myThready = new Thread(() -> {
launch(args);
});
myThready.start();
}
}