How to Fix 'JavaFX Dialogbox taking user input' problem - javafx

Question

I am creating a JavaFx dialog box and I have written to a large extent the code. My problem is how to display the error message if a user enters the invalid input. I know I have to use a while loop somewhere but not sure where because of the structure of JavaFx dialog box. Second problem is if the user enters the right input, say 1 for yes, I would want to call a function to carry out a task.
The code I have written brings up the pop up box and prints the consequence of the user input to the console.
public static void AnotherMatch() {
//creates a popUp window
Stage popUp = new Stage();
// makes sure no changes are made in the Main window while this window is open
popUp.initModality(Modality.APPLICATION_MODAL);
popUp.setTitle("New Game");
popUp.setMinWidth(400);
popUp.setHeight(200);
TextPanel textPanel2 = new TextPanel();
TextField nameInput = new TextField();
Button button = new Button("Enter");
//label explains how the game works
Label displayLabel = new Label();
displayLabel.setText("Do you want to play another match: Yes: 1 -- No: 2");
button.setOnAction(e -> isChoice(nameInput, nameInput.getText()));
//vbox stores label and is set in centre
VBox windowDisplay = new VBox();
windowDisplay.setStyle("-fx-background-color:Wheat"); //background colour is set
windowDisplay.getChildren().addAll(displayLabel,nameInput, button);
windowDisplay.setAlignment(Pos.CENTER);
Scene scene = new Scene(windowDisplay);
popUp.setScene(scene);
popUp.showAndWait(); }
Code for isChoice function
private static boolean isChoice(TextField nameInput, String message) {
// TODO Auto-generated method stub
try {
int choice = Integer.parseInt(nameInput.getText());
if(choice == 1) {
System.out.println("I want to play game again");
return true;
}
else if (choice == 2){
System.out.println("I want to stop playing");
return false;
}
else {
System.out.println("Invalid entry");
return false;
}
}
catch(NumberFormatException e){
System.out.println(message + " Invalid .Enter 1 for yes and 2 for no");
return false;
}
}
The user should be asked to enter yes or no. If the user invalid input, an error message should be displayed to the user and the answer asked again until they answer yes or no.

Answer 1

One way you can do is using Bindings to disable the Button unless the TextField contains Yes or No(ignore case).
Demo App using Bindings.
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.event.ActionEvent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
/**
*
* #author blj0011
*/
public class JavaFXApplication357 extends Application
{
#Override
public void start(Stage primaryStage)
{
TextField textField = new TextField();
Button btn = new Button();
btn.disableProperty().bind(Bindings.notEqualIgnoreCase("yes", textField.textProperty()).and(Bindings.notEqualIgnoreCase("no", textField.textProperty())));
btn.setText("Say 'Hello World'");
btn.setOnAction((ActionEvent event) -> {
System.out.println("Hello World!");
});
StackPane root = new StackPane(new VBox(textField, 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);
}
}