Javafx: Close alert box (or, any dialog box) programatically

Question

I have a JavaFx application in which I display an alert box using:

alert = new Alert(AlertType.CONFIRMATION);
alert.setTitle(\"Title\");
alert.setHeaderText(         


        

Answer 1

You can invoke close() method on the Alert or any Dialog.

Here is a simple example which waits for 5 secs, and if the Alert is still showing, it closes it.

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.control.Alert;
import javafx.scene.control.ButtonBar;
import javafx.scene.control.ButtonType;
import javafx.stage.Stage;

import java.util.Optional;

public class Main extends Application{

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        Alert alert = new Alert(Alert.AlertType.CONFIRMATION);
        alert.setTitle("Title");
        alert.setHeaderText("Some Text");
        alert.setContentText("Choose your option.");
        ButtonType buttonTypeOne = new ButtonType("Yes");
        ButtonType buttonTypeCancel = new ButtonType("No", ButtonBar.ButtonData.CANCEL_CLOSE);
        alert.getButtonTypes().setAll(buttonTypeOne, buttonTypeCancel);

        Thread thread = new Thread(() -> {
            try {
                // Wait for 5 secs
                Thread.sleep(5000);
                if (alert.isShowing()) {
                    Platform.runLater(() -> alert.close());
                }
            } catch (Exception exp) {
                exp.printStackTrace();
            }
        });
        thread.setDaemon(true);
        thread.start();
        Optional<ButtonType> result = alert.showAndWait();
    }
}

Answer 2

It's closing opened dialog in 2 second.

dialog = new Dialog<>();
dialog.setTitle("It's a dialog!");
dialog.show();

    Thread newThread = new Thread(new Runnable() {
    @Override
        public void run() {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException ex) {
                Thread.currentThread().interrupt();
            }

            Platform.runLater(new Runnable() {
                @Override
                public void run() {
                    dialog.close();
                }
                });
            }
    });
    newThread.start();

Answer 3

Try this

public void function2 {
    Button cancelButton = ( Button ) alert.getDialogPane().lookupButton( buttonTypeCancel );
    cancelButton.fire();
}

Or for more general

public void function2 {
    for ( ButtonType bt : alert.getDialogPane().getButtonTypes() )
    {
        if ( bt.getButtonData() == ButtonBar.ButtonData.CANCEL_CLOSE )
        {
            Button cancelButton = ( Button ) alert.getDialogPane().lookupButton( bt );
            cancelButton.fire();
            break;
        }
    }
}

---

Full example:

@Override
public void start( final Stage primaryStage )
{
    Alert alert = new Alert( Alert.AlertType.CONFIRMATION );
    alert.setTitle( "Title" );
    alert.setHeaderText( "Some Text" );
    alert.setContentText( "Choose your option." );
    ButtonType buttonTypeOne = new ButtonType( "Yes" );
    alert.initModality( Modality.NONE );
    ButtonType buttonTypeCancel = new ButtonType( "No", ButtonBar.ButtonData.CANCEL_CLOSE );
    alert.getButtonTypes().setAll( buttonTypeOne, buttonTypeCancel );

    Button b = new Button( "close alert" );
    b.setOnAction(( ActionEvent event ) ->
    {
        for ( ButtonType bt : alert.getDialogPane().getButtonTypes() )
        {
            System.out.println( "bt = " + bt );
            if ( bt.getButtonData() == ButtonBar.ButtonData.CANCEL_CLOSE )
            {
                Button cancelButton = ( Button ) alert.getDialogPane().lookupButton( bt );
                cancelButton.fire();
                break;
            }
        }
    });

    final Scene scene = new Scene( new Group( b ), 400, 300 );
    primaryStage.setScene( scene );
    primaryStage.show();

    Optional<ButtonType> result = alert.showAndWait();
    if ( result.get() == buttonTypeOne )
    {
        System.out.println( "one " );
    }
    else if( result.get() == buttonTypeCancel )
    {
        System.out.println( "cancel " );
    }
}