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problem when trying JavaFX EventHandler ActionEvent with JOptionPane on Mac

after run this and press {play} button java stops and not respond on Mac
so I don't know what is the problem , I tried it in another another device (macOS )and same result.
any one have an idea !
import javafx.application.Application;
import javafx.event.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.*;
import javax.swing.*;
public class MyFX_event_1 extends Application{
public static void main(String[] args) { Application.launch(args); }
public void start(Stage primaryStage){
// Create a pane and set its properties
HBox pane = new HBox(10);
Button btn1 = new Button("PLAY");
MyHandlerClass handler1 = new MyHandlerClass();
btn1.setOnAction(handler1);
pane.getChildren().addAll(btn1);
// Create a scene and place it in the stage
Scene scene = new Scene(pane, 100, 100);
primaryStage.setTitle("HandleEvent"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
}
class MyHandlerClass implements EventHandler<ActionEvent> {
#Override
public void handle(ActionEvent e) {
JOptionPane.showMessageDialog(null , "game will start");}
}
}

JavaFX wait until value is set

I am struggling with the following problem:
I have something like a popup in my javafx application, that should block the application, until the user made some input. It is NOT a seperate stage, where i can call showAndWait() and then return the input of the stage. The popup is realized as a pane, that is placed over the other components. And now i do something like this:
PopupPane pp = new PopupPane()
stackPane.add(new PopupPane()); //show pane
//... waiting until user terminates popup
return pp.getInput(); //returns input when user terminates popup
So i want pp.getInput() to wait, until the user presses the OK/CANCEL/APPLY/... button in my popup. How can i realize something like showAndWait() in this situation?

One possible way to do this would be to utilize an additional pane that can be disabled while the "popup" is being displayed.
For example, say the root layout pane of your Scene is a StackPane. You could wrap all the rest of your interface in another Pane that you'll disable or enable as needed.
When the "popup" needs to be displayed, add it to your StackPane and disable the "content" pane. When the popup closes, just remove it from your StackPane and re-enable the "content" pane.
Here's a quick and admittedly unattractive example of the concept:
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class SimulatedPopupExample extends Application {
private static StackPane root;
private static BorderPane content;
public static void main(String[] args) {
launch(args);
}
private static void showPopup() {
// Disable the main layout pain
content.setDisable(true);
VBox popup = new VBox();
popup.setPadding(new Insets(10));
popup.setAlignment(Pos.CENTER);
popup.setStyle("-fx-border-color: black; -fx-background-color: -fx-base;");
popup.setMaxSize(200, 200);
popup.getChildren().add(
new Button("Close Popup") {{
setOnAction(event -> {
// Re-enable the pane
content.setDisable(false);
// Remove popup from root layout
root.getChildren().remove(popup);
});
}}
);
// Add popup to root layout
root.getChildren().add(popup);
}
#Override
public void start(Stage primaryStage) {
// Simple Interface
root = new StackPane();
content = new BorderPane(
new Button("Show \"Popup\"") {{
setOnAction(e -> showPopup());
}},
new Button("Top Button"),
new Button("Right Button"),
new Button("Bottom Button"),
new Button("Left Button")
);
root.getChildren().add(content);
// Show the stage
primaryStage.setScene(new Scene(root));
primaryStage.setWidth(500);
primaryStage.setHeight(400);
primaryStage.setTitle("SimulatedPopupExample Sample");
primaryStage.show();
}
}
The Result:

Here is a Custom Dialog that can not be closed or accepted until the user enter data in the TextField
private void showInputTextDialog(){
Label lblAmt = new Label("Enter Amount");
Button btnOK = new Button("OK");
TextField txtAmt = new TextField();
AnchorPane customDialog = new AnchorPane();
customDialog.setStyle("-fx-border-color:red;-fx-border-width:10px; -fx-background-color: lightblue;");
customDialog.getChildren().addAll(lblAmt,btnOK,txtAmt);
lblAmt.setLayoutX(30);
lblAmt.setLayoutY(30);
txtAmt.setLayoutX(164);
txtAmt.setLayoutY(25);
txtAmt.setMaxWidth(116);
btnOK.setLayoutX(190);
btnOK.setLayoutY(100);
btnOK.setStyle("-fx-font-size: 18px;-fx-font-weight: bold;");
lblAmt.setStyle("-fx-font-size: 18px;-fx-font-weight: bold;");
txtAmt.setStyle("-fx-font-size: 18px;-fx-font-weight: bold;");
Scene secondScene = new Scene(customDialog, 300, 180);
EventHandler<ActionEvent> filter = event -> {
if(txtAmt.getText().isEmpty()) {
event.consume();
}
};
// New window (Stage)
Stage newWindow = new Stage();
//newWindow.initStyle(StageStyle.UNDECORATED);
newWindow.initModality(Modality.APPLICATION_MODAL);
newWindow.setResizable(false);
//newWindow.setTitle("Custom Dialog");
newWindow.setScene(secondScene);
btnOK.addEventHandler(ActionEvent.ACTION,filter);
btnOK.setOnAction(evt -> {
String str = txtAmt.getText();
System.out.println("################ str "+str);
if(txtAmt.getText().trim().equals("")) {
evt.consume();
txtAmt.clear();
txtAmt.requestFocus();
}else{
txAMT = Double.valueOf(str);
newWindow.close();
}
});
newWindow.setOnCloseRequest(event -> {
if(txtAmt.getText().isEmpty()) {
event.consume();
}
});
txtAmt.requestFocus();
newWindow.showAndWait();
}

Java FX update one TextField based on another TextField value

I am new to JAVA FX, I want to 'live' update one TextField based on another TextField value.
This is my snippet code:
#FXML
private void initialize() {
tf_code.textProperty().addListener((observable, oldValue, newValue) -> {
System.out.println(newValue.substring(2, 6));
tf_newCode.setText(newValue.substring(2, 6));
});
}
Should I add another listener to my second TextField ?

Works for me. Note that the below code does not require a .fxml file. Perhaps the call to method substring() in the code you posted is throwing an Exception that you are unaware of because you are catching it in an empty catch block? Of-course I'm only guessing since you only posted part of your code.
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
public class JfxTst00 extends Application {
public void start(Stage mainStage) throws Exception {
mainStage.setTitle("JfxTst00");
BorderPane root = new BorderPane();
TextField tf_NewCode = new TextField();
TextField tf_Code = new TextField();
tf_Code.textProperty().addListener((observable, oldVal, newVal) -> tf_NewCode.setText(newVal));
root.setTop(tf_Code);
root.setBottom(tf_NewCode);
Scene scene = new Scene(root, 220, 70);
mainStage.setScene(scene);
mainStage.show();
}
public static void main(String[] args) {
launch(args);
}
}

Your questions does not actually explain the problem you're facing, though I see a few that you should be having.
First of all, you only need one listener for the first TextField because that is the one we are watching for changes.
Then you need to account for input into the TextField that is less than 2 characters and more than 6. Since you have set hard limits in your subString(2, 6) call, we only want our listener to work within those constraints.
Here is a simple text application that demonstrates:
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class TextFieldBinding extends Application {
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage primaryStage) {
// Simple interface
VBox root = new VBox(5);
root.setPadding(new Insets(10));
root.setAlignment(Pos.CENTER);
TextField txt1 = new TextField();
TextField txt2 = new TextField();
txt1.textProperty().addListener((observable, oldValue, newValue) -> {
// First, only update txt2 if the new value entered in txt1 is greater than 2, otherwise
// our substring() method will throw an exception
if (newValue.length() > 2) {
// We also need to prevent trying to get a substring that exceeds the remaining length
// of the txt1 input
int maxIndex;
if (newValue.length() < 6) {
maxIndex = newValue.length();
} else {
maxIndex = 6;
}
// Now set the text for txt2
txt2.setText(newValue.substring(2, maxIndex));
}
});
root.getChildren().addAll(txt1, txt2);
// Show the Stage
primaryStage.setWidth(300);
primaryStage.setHeight(300);
primaryStage.setScene(new Scene(root));
primaryStage.show();
}
}

Let Window scroll down in JavaFX

So I am trying to learn Java now that I know JavaScript and PHP. I am working in Netbeans with JavaFX and I am trying to create a program that creates 5 buttons. (This is modifying the code that comes with Netbeans when creating a new JavaFX Application.) If I change the y-argument of the scene to be less than the y of all of the buttons, it will not display the remaining buttons and it will not be able scroll down. This is what I have so far. How do I enable it to scroll down so all buttons can be seen? I know that I can just change the scene back to its old height but I want to learn about scrolling with JavaFX.
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;
import javax.swing.JScrollPane;
public class JavaFXApplication1 extends Application {
#Override
public void start(Stage primaryStage) {
GridPane root = new GridPane();
Button[] btn=new Button[5];
for(int i=0;i<5;i++){
btn[i] = new Button();
btn[i].setText(i+"");
GridPane.setRowIndex(btn[i],i);
root.getChildren().addAll(btn[i]);
btn[i].setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
System.out.println("This is a button");
}
});
}
Scene scene = new Scene(root, 300, 50);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}

Using ScrollPane to set root as:
ScrollPane sp = new ScrollPane();
sp.setContent(root);
Scene scene = new Scene(sp, 300, 50);

TextField right alignment issue javafx

I have textfield that containing a value and that value should be Right alignment.
When i run the application it display the text left alignment but i set the Right alignment.
and problem with 3rd textfield.
After clicking the update button it works fine.
So may i know why it is behave different.
Code:
import java.io.File;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
public class TextFieldAlignment extends Application {
TextField rText;
File file;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage stage) {
rText = new TextField("updated right1 updated right2 updated right3 updated right4");
rText.setAlignment(Pos.CENTER_RIGHT);
Button btn = new Button("update");
btn.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent t) {
rText.setText("updated right1 updated right2 updated right3 updated right4");
// applyWorkaround();
}
});
final Label labelFile = new Label();
Button btn2 = new Button();
btn2.setText("Open FileChooser'");
btn2.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
FileChooser fileChooser = new FileChooser();
//Set extension filter
FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter("AVI files (*.exml)", "*.exml");
fileChooser.getExtensionFilters().add(extFilter);
//Show open file dialog
file = fileChooser.showOpenDialog(null);
// rText.setText(file.getPath());
}
});
VBox root = new VBox();
root.getChildren().addAll(rText, btn, btn2);
stage.setScene(new Scene(root, 200, 300));
stage.show();
}
}

Put the setalignment and settext after you add the TextField to the Scene.
Ref: Java API docs for Node
Node objects may be constructed and modified on any thread as long
they are not yet attached to a Scene. An application must attach nodes
to a Scene, and modify nodes that are already attached to a Scene, on
the JavaFX Application Thread.