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how to switching scenes in javafx (NO FXML)

I ask for your understanding, I am a beginner;)
I'm trying to build a simple application using JavaFX. The problem is that when I open the window the first time it goes well, but if I want to change the scene it throws an error...
Exception in thread "JavaFX Application Thread"
java.lang.IllegalArgumentException:
AnchorPane#1809546[styleClass=root]is already set as root of another
scene#
Main class
public class Main extends Application{
//private Stage primaryStage;
#Override
public void start(Stage primaryStage) {
Login login = new Login();
Scene scene = login.okno();
primaryStage.setTitle("Komunikator sieciowy JAVA");
primaryStage.setScene(scene);
primaryStage.setResizable(false);
primaryStage.show();
}
//public Stage getPrimaryStage() {
// return this.primaryStage;
//}
public static void main(String[] args) {
launch(args);
}
}
Login
public class Login {
private GridPane grid;
private Scene scene;
private Text title;
private Label nick;
private Button wejdzBtn;
private TextField userName;
//private Alert oknoDlg;
public Login() {
grid = new GridPane();
grid.setAlignment (Pos.CENTER);
grid.setHgap(10);
grid.setVgap(10);
grid.setPadding(new Insets(25,25,25,25));
scene = new Scene (grid, 300, 150);
utworzBtn();
utworzLogin();
utworzTekst();
utworzNick();
//oknoDialogowe();
}
//private void oknoDialogowe() {
//Alert oknoDlg = new Alert(Alert.AlertType.CONFIRMATION);
//oknoDlg.setTitle("Informacja");
//oknoDlg.setContentText("test");
// oknoDlg.setHeaderText(null);
//oknoDlg.showAndWait();
//}
private void utworzBtn() {
wejdzBtn = new Button("Zaloguj si\u0119");
HBox hbBtn = new HBox(10);
hbBtn.setAlignment (Pos.BOTTOM_RIGHT);
hbBtn.getChildren().add(wejdzBtn);
grid.add(hbBtn, 1, 2);
//wejdzBtn.setDisable(true);
wejdzBtn.setOnAction(e -> {
Messages mess = new Messages();
grid.getScene().setRoot(mess.messa());;
});
}
private void utworzLogin() {
nick = new Label("Nick:");
grid.add(nick, 0, 1);
}
private void utworzNick() {
userName = new TextField();
grid.add(userName,1,1);
// informacja w polu tekstowym
userName.setPromptText("Max 15 znak\u00f3w");
userName.setFocusTraversable(false);
//maksymalna ilość znaków
final int maxLength = 15;
userName.setOnKeyTyped(t -> {
if (userName.getText().length() > maxLength)
{
int pos = userName.getCaretPosition();
userName.setText(userName.getText(0, maxLength));
userName.positionCaret(pos);
}
});
}
private void utworzTekst() {
title = new Text ("Dzień dobry!");
title.setFont(Font.font("Calibri", FontWeight.NORMAL, 20));
grid.add(title, 0, 0, 2, 1);
}
public Scene okno() {
return scene;
}
}
and and a little another class that I'm trying to change with button from login.java
public class Messages {
private AnchorPane anchor;
private Scene scena;
//private Label nick;
private Button sendBtn;
private TextField poleDoWpisywania;
private TextArea poleDoWyswietlania, pobierzNick;
public Messages() {
anchor = new AnchorPane();
scena = new Scene(anchor, 700, 600);
pobierzNick();
poleDoWpisywania();
poleDoWyswietlania();
utworzPrzycisk();
}
private void utworzPrzycisk() {
sendBtn = new Button("Wy\u015Blij");
sendBtn.setDisable(true);
}
private void pobierzNick(){
pobierzNick = new TextArea();
pobierzNick.setEditable(false);
pobierzNick.setWrapText(true);
}
private void poleDoWpisywania() {
poleDoWpisywania = new TextField();
}
private void poleDoWyswietlania() {
poleDoWyswietlania = new TextArea();
poleDoWyswietlania.setEditable(false);
poleDoWyswietlania.setWrapText(true);
}
public Pane messa() {
return anchor;
}
}
could I ask you to show the right way to fix the bug?

JavaFX defines a scene graph which is a tree data structure that has a single root node. For your application (i.e. the code you posted), the root node is the primaryStage (this is the parameter in method start() in class Main). The primaryStage can have several Scenes. Each Scene must have its own root node.
The error message you are getting means that a Scene's root cannot also be the root of another Scene. In other words anchor is the root for scena in class Messages which means it can't be set as the root for scene in class Login.
Apart from that, if you want to change Scene's you need to call method setScene() of class Stage. Here is your Login class and Messages class with changes that solve the run-time error you are getting and perform the scene change when the user clicks on wejdzBtn button.
Login.java
(I only changed the lambda expression in method utworzBtn().)
public class Login {
private GridPane grid;
private Scene scene;
private Text title;
private Label nick;
private Button wejdzBtn;
private TextField userName;
public Login() {
grid = new GridPane();
grid.setAlignment(Pos.CENTER);
grid.setHgap(10);
grid.setVgap(10);
grid.setPadding(new Insets(25,25,25,25));
scene = new Scene(grid, 300, 150);
utworzBtn();
utworzLogin();
utworzTekst();
utworzNick();
}
private void utworzBtn() {
wejdzBtn = new Button("Zaloguj si\u0119");
HBox hbBtn = new HBox(10);
hbBtn.setAlignment (Pos.BOTTOM_RIGHT);
hbBtn.getChildren().add(wejdzBtn);
grid.add(hbBtn, 1, 2);
wejdzBtn.setOnAction(e -> {
Messages mess = new Messages();
Window w = scene.getWindow();
if (w instanceof Stage) {
Stage s = (Stage) w;
s.setScene(mess.getScena());
}
});
}
private void utworzLogin() {
nick = new Label("Nick:");
grid.add(nick, 0, 1);
}
private void utworzNick() {
userName = new TextField();
grid.add(userName,1,1);
userName.setPromptText("Max 15 znak\u00f3w");
userName.setFocusTraversable(false);
final int maxLength = 15;
userName.setOnKeyTyped(t -> {
if (userName.getText().length() > maxLength)
{
int pos = userName.getCaretPosition();
userName.setText(userName.getText(0, maxLength));
userName.positionCaret(pos);
}
});
}
private void utworzTekst() {
title = new Text ("Dzień dobry!");
title.setFont(Font.font("Calibri", FontWeight.NORMAL, 20));
grid.add(title, 0, 0, 2, 1);
}
public Scene okno() {
return scene;
}
}
Messages.java
(I added method getScena().)
public class Messages {
private AnchorPane anchor;
private Scene scena;
private Button sendBtn;
private TextField poleDoWpisywania;
private TextArea poleDoWyswietlania, pobierzNick;
public Messages() {
anchor = new AnchorPane();
scena = new Scene(anchor, 700, 600);
pobierzNick();
poleDoWpisywania();
poleDoWyswietlania();
utworzPrzycisk();
}
private void utworzPrzycisk() {
sendBtn = new Button("Wy\u015Blij");
sendBtn.setDisable(true);
}
private void pobierzNick() {
pobierzNick = new TextArea();
pobierzNick.setEditable(false);
pobierzNick.setWrapText(true);
}
private void poleDoWpisywania() {
poleDoWpisywania = new TextField();
}
private void poleDoWyswietlania() {
poleDoWyswietlania = new TextArea();
poleDoWyswietlania.setEditable(false);
poleDoWyswietlania.setWrapText(true);
}
public Scene getScena() {
return scena;
}
public Pane messa() {
return anchor;
}
}

Thanks a lot Abra, I've been thinking about it for the last 6 hours and haven't noticed this problem. I have also removed
public Pane messa ();
return anchor;
I do not need it ;)

When trying to add items to a JavaFX TableView through an ObservableList, the TableView items won't show

I'm making a grocery list app, and it has the feature to add items to the list(a tableview) along with the # of items and price. THe thing is, it works(because the tableview doesnt say "No content in table") But the table is blank. Any suggestions?
Code:
package listproject;
public class Main extends Application{
public Node getNodeByRowColumnIndex(final int row,final int column,GridPane gridPane) {
Node result = null;
ObservableList<Node> childrens = gridPane.getChildren();
for(Node node : childrens) {
if(gridPane.getRowIndex(node) == row && gridPane.getColumnIndex(node) == column) {
result = node;
break;
}
}
return result;
}
ObservableList<Product> data =
FXCollections.observableArrayList(
);
#Override
public void start(Stage primaryStage) {
primaryStage.setTitle("Grocery List");
primaryStage.setWidth(450);
primaryStage.setHeight(800);
//menu buttons
Button addLinkMain = new Button("Add an Item");
Button addLinkTitle = new Button("Add an Item");
Button mainLinkAdd = new Button("Back");
Button mainLinkTitle = new Button("Back");
Button addItem = new Button("Add");
Button setTitleMenu = new Button("Set Title");
Button setTitleAdd = new Button("Set Title");
Button clear = new Button("Clear");
//items for the item addition screen
TextField title = new TextField("Name");
TextField quantity = new TextField("#");
TextField price = new TextField("$");
HBox addBox = new HBox();
BorderPane addBorder = new BorderPane();
HBox addMenu = new HBox();
//mainScene items
BorderPane pane = new BorderPane();
HBox mainscenemenu=new HBox();
TableView<Product> tableview = new TableView<Product>();
//tableview items
TableColumn itemTitle=new TableColumn("Product");
TableColumn itemQuantity=new TableColumn("Quantity");
TableColumn itemPrice=new TableColumn("Price");
//settitle items
TextField listTitle= new TextField("Rename the List");
Button setTittle = new Button("Set List Title");
BorderPane setTitlePane=new BorderPane();
StackPane setTitleFieldContainer=new StackPane();
HBox setTitleOwnMenu = new HBox();
//Scene declaration
Scene mainScene = new Scene(pane);
primaryStage.setScene(mainScene);
Scene addScene = new Scene(addBorder);
Scene setTitleScene = new Scene(setTitlePane);
//Main Scene
pane.setCenter(tableview);
pane.setBottom(mainscenemenu);
tableview.getColumns().addAll(itemTitle,itemQuantity,itemPrice);
mainscenemenu.getChildren().addAll(setTitleMenu,clear,addLinkMain);
tableview.setItems(data);
//Item Addition Scene
addBox.getChildren().addAll(title,quantity,price);
addMenu.getChildren().addAll(mainLinkAdd,addItem,setTitleAdd);
addBorder.setCenter(addBox);
addBorder.setBottom(addMenu);
//Set Title Scene
setTitleFieldContainer.getChildren().addAll(listTitle);
setTitleOwnMenu.getChildren().addAll(addLinkTitle,setTittle,mainLinkTitle);
setTitlePane.setCenter(setTitleFieldContainer);
setTitlePane.setBottom(setTitleOwnMenu);
//Menu Button Event Handlers
addLinkMain.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent e) {
primaryStage.setScene(addScene);
}
});
addLinkTitle.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent e) {
primaryStage.setScene(addScene);
}
});
mainLinkAdd.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent e) {
primaryStage.setScene(mainScene);
}
});
mainLinkTitle.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent e) {
primaryStage.setScene(mainScene);
}
});
setTitleMenu.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent e) {
primaryStage.setScene(setTitleScene);
}
});
setTitleAdd.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent e) {
primaryStage.setScene(setTitleScene);
}
});
//Adding an Item to the List *unfinished
addItem.setOnAction(new EventHandler<ActionEvent>(){
#Override
public void handle(ActionEvent event) {
data.add(new Product(title.getText(),quantity.getText(),price.getText()));
}
});
//Changing the Title of The List
setTittle.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
primaryStage.setTitle(listTitle.getText());
}
});
//Clearing the List
clear.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
tableview.getItems().clear();
}
});
//Show the Stage
primaryStage.show();
}
public static void main(String[] args){
launch(args);
}
}

You never set the cellValueFactorys for the table's columns. You need to do this to specify the part of the items that should be displayed in the column.
An example with anonymus classes as cellValueFactorys can be found here.
Using PropertyValueFactory could reduce the amount of code needed. More about this here.
A tutorial can be found here: https://docs.oracle.com/javase/8/javafx/user-interface-tutorial/table-view.htm

Switching between the classes

I have main class where has started first stage and I wanna to launch by button_info another stage , which code I wrote to another class. I do not use FXML, just classic JavaFx even if the FMXL is better. Any idea ? Thanks.
mainclass
public class StartClass extends Application {
#Override
public void start(Stage primaryStage) {
/*******************************
* Incialization of variables *
*******************************/
final Group group = new Group();
final TransactionWindows tw = new TransactionWindows();
final InfoWindow iw = new InfoWindow();
/*******************************
* Button *
*******************************/
final Button button_zacit = new Button ();
button_zacit.setText("Začít");
button_zacit. setPrefHeight(30);
button_zacit.setPrefWidth(103);
button_zacit.setLayoutX(255);
button_zacit.setLayoutY(150);
group.getChildren().add(button_zacit);
final Button button_info = new Button ();
button_info.setText("Info");
button_info. setPrefHeight(30);
button_info.setPrefWidth(103);
button_info.setLayoutX(255);
button_info.setLayoutY(217);
group.getChildren().add(button_info);
final Button button_konec = new Button ();
button_konec.setText("Konec");
button_konec. setPrefHeight(30);
button_konec.setPrefWidth(103);
button_konec.setLayoutX(255);
button_konec.setLayoutY(285);
group.getChildren().add(button_konec);
/*******************************
* Text *
*******************************/
final Text text_uvod = new Text ();
text_uvod.setText("Vítejte ve hře Guess Word");
text_uvod.setLayoutX(78);
text_uvod.setLayoutY(57);
text_uvod.setTextAlignment(TextAlignment.CENTER);
text_uvod.setFont(new Font(30));
group.getChildren().add(text_uvod);
/*******************************
* Methods of Button *
*******************************/
button_konec.setOnAction(new EventHandler<ActionEvent> () {
#Override
public void handle(ActionEvent t) {
Platform.exit();
}
});
button_info.setOnAction(new EventHandler<ActionEvent> () {
#Override
public void handle(ActionEvent t) {
InfoWindow.launch();
}
});
Pane root = new Pane();
root.getChildren().addAll(group);
Scene scene = new Scene(root, 600, 400);
// scene.getStylesheets().addAll("mainpackage/GW.css");
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
class where is another stage:
ublic class InfoWindow extends Application{
#Override
public void start(Stage infoStage) throws Exception {
/********************************
* Inicializaion of variables *
*******************************/
Group groupInfo = new Group();
/*******************************
* TextArea *
*******************************/
TextArea textarea_info = new TextArea();
textarea_info.setPrefHeight(241);
textarea_info.setPrefWidth(454);
textarea_info.setLayoutX(73);
textarea_info.setLayoutY(35);
textarea_info.setText("Text se bude brát ze složky");
textarea_info.setEditable(false);
groupInfo.getChildren().add(textarea_info);
Pane root = new Pane();
root.getChildren().addAll(groupInfo);
Scene scene = new Scene(root, 600, 400);
infoStage.setScene(scene);
infoStage.show();
}
}

So you want the InfoWindow as a popup window?
If so, then the InfoWindow should be subclass of Stage and not Application.

ControlsFX 8.20.7 Wizard examples - getting Wizards to work

I am trying to develop a wizard using the new ControlsFX 8.20.7 release. I have taken a look at the following example: BitBucket ControlsFX, and especially the method
showLinearWizard()
I simply can't understand how to use this API, can anyone help me get going or link to some examples?
This is my code right now, full of errors:
public class WizardTest extends Application {
private final ComboBox<StageStyle> styleCombobox = new ComboBox<>();
private final ComboBox<Modality> modalityCombobox = new ComboBox<>();
private final CheckBox cbUseBlocking = new CheckBox();
private final CheckBox cbCloseDialogAutomatically = new CheckBox();
private final CheckBox cbShowMasthead = new CheckBox();
private final CheckBox cbSetOwner = new CheckBox();
private final CheckBox cbCustomGraphic = new CheckBox();
private Stage stage;
#Override
public void start(Stage primaryStage) {
Button btn = new Button();
btn.setText("Say 'Hello World'");
btn.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
showLinearWizard();
}
});
StackPane root = new StackPane();
root.getChildren().add(btn);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
private void showLinearWizard() {
// define pages to show
Wizard wizard = new Wizard();
wizard.setTitle("Linear Wizard");
// --- page 1
int row = 0;
GridPane page1Grid = new GridPane();
page1Grid.setVgap(10);
page1Grid.setHgap(10);
page1Grid.add(new Label("First Name:"), 0, row);
TextField txFirstName = createTextField("firstName");
wizard.getValidationSupport().registerValidator(txFirstName, Validator.createEmptyValidator("First Name is mandatory"));
page1Grid.add(txFirstName, 1, row++);
page1Grid.add(new Label("Last Name:"), 0, row);
TextField txLastName = createTextField("lastName");
wizard.getValidationSupport().registerValidator(txLastName, Validator.createEmptyValidator("Last Name is mandatory"));
page1Grid.add(txLastName, 1, row);
WizardPane page1 = new WizardPane();
page1.setHeaderText("Please Enter Your Details");
page1.setContent(page1Grid);
// --- page 2
final WizardPane page2 = new WizardPane() {
#Override
public void onEnteringPage(Wizard wizard) {
String firstName = (String) wizard.getSettings().get("firstName");
String lastName = (String) wizard.getSettings().get("lastName");
setContentText("Welcome, " + firstName + " " + lastName + "! Let's add some newlines!\n\n\n\n\n\n\nHello World!");
}
};
page2.setHeaderText("Thanks For Your Details!");
// --- page 3
WizardPane page3 = new WizardPane();
page3.setHeaderText("Goodbye!");
page3.setContentText("Page 3, with extra 'help' button!");
ButtonType helpDialogButton = new ButtonType("Help", ButtonData.HELP_2);
page3.getButtonTypes().add(helpDialogButton);
Button helpButton = (Button) page3.lookupButton(helpDialogButton);
helpButton.addEventFilter(ActionEvent.ACTION, actionEvent -> {
actionEvent.consume(); // stop hello.dialog from closing
System.out.println("Help clicked!");
});
// create wizard
wizard.setFlow(new LinearFlow(page1, page2, page3));
System.out.println("page1: " + page1);
System.out.println("page2: " + page2);
System.out.println("page3: " + page3);
// show wizard and wait for response
wizard.showAndWait().ifPresent(result -> {
if (result == ButtonType.FINISH) {
System.out.println("Wizard finished, settings: " + wizard.getSettings());
}
});
}
private TextField createTextField(String id) {
TextField textField = new TextField();
textField.setId(id);
GridPane.setHgrow(textField, Priority.ALWAYS);
return textField;
}
}

The problem was that I forgot to add the
openjfx-dialogs.jar

How to get clicked item in textbox from dropdown listview javafx 8?

I am trying to get clicked value in my textbox, i have added listener but not getting the adjact output. Please suggest me how to do.
ObservableList<String> data5 = FXCollections.observableArrayList(smooth);
listView.setItems(data5);
listView.getSelectionModel().selectedItemProperty().addListener(
new ChangeListener<String>() {
public void changed(ObservableValue<? extends String> ov,
String old_val, String new_val)
{
System.out.println("********"+new_val);
txtCustomerName.textProperty();
txtCustomerName.setText(new_val);
}
});

public class FillForm extends Application {
Text addressOne;
Text addressTwo;
Text mobileOne;
Text email;
#Override
public void start(Stage stage) throws Exception {
Label companyNameLbl = new Label("Company Name");
ComboBox<String> companyName = new ComboBox<String>();
companyName.setEditable(true);
populateCompanyName(companyName);
addComboListener(companyName);
HBox companyHbox = new HBox(25);
companyHbox.getChildren().addAll(companyNameLbl, companyName);
Label addressOneLbl = new Label("Address One");
addressOne = new Text();
HBox addressOneHbox = new HBox();
addressOneHbox.getChildren().addAll(addressOneLbl, addressOne);
Label addressTwoLbl = new Label("Address two");
addressTwo = new Text();
HBox addressTwoHbox = new HBox();
addressTwoHbox.getChildren().addAll(addressTwoLbl, addressTwo);
Label mobileLbl = new Label("Company Name");
mobileOne = new Text();
HBox mobileHbox = new HBox();
mobileHbox.getChildren().addAll(mobileLbl, mobileOne);
Label emailLbl = new Label("Company Name");
email = new Text();
HBox emailHbox = new HBox();
emailHbox.getChildren().addAll(emailLbl, email);
VBox form = new VBox(20);
form.getChildren().addAll(companyHbox, addressOneHbox, addressTwoHbox,
mobileHbox, emailHbox);
Scene scene = new Scene(form);
stage.setScene(scene);
scene.getStylesheets().add("/comboStyles.css");
stage.show();
}
private void addComboListener(final ComboBox<String> combo) {
combo.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent e) {
if (combo.getValue().equals("Apple")) {
addressOne.setText("\t Apple address one");
addressTwo.setText("\t Apple address two");
mobileOne.setText("\t Apple mobile number");
email.setText("\t Apple email");
}
}
});
}
public void populateCompanyName(ComboBox<String> combo) {
combo.getItems().add("Intel");
combo.getItems().add("Apple");
combo.getItems().add("Microsoft");
}
public static void main(String[] args) {
launch(args);
}
}
comboStyles.css
.combo-box .arrow, .combo-box .arrow-button{
-fx-background-color: transparent;
}
output:
I have made a rough example without using proper layouts. You use the appropriate layout for your UI. Populate the combobox with your data5 list and in the action listener of the combo box check for the selected value and fill other fields.
Update
Since you have to use only text box as your company said, the below links guide you in that. You have to create a customized text box by extending the Text class of Javafx.
https://github.com/privatejava/javafx-autocomplete-field
http://blog.ngopal.com.np/2011/07/04/autofill-textbox-with-filtermode-in-javafx-2-0-custom-control/
Autofill text field jars:
https://code.google.com/p/jfx-autocomplete-textfield/