How to create and show common dialog (Error, Warning, Confirmation) in JavaFX 2.0?

How do I create and show common dialogs (Error, Warning, Confirmation) in JavaFX 2.0? I can't find any "standard" classes like Dialog, DialogBox, Message or something.

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EDIT: dialog support was added to JavaFX, see https://stackoverflow.com/a/28887273/1054140

There were no common dialog support in a year 2011. You had to write it yourself by creating new Stage():

Stage dialogStage = new Stage();
dialogStage.initModality(Modality.WINDOW_MODAL);


VBox vbox = new VBox(new Text("Hi"), new Button("Ok."));
vbox.setAlignment(Pos.CENTER);
vbox.setPadding(new Insets(15));


dialogStage.setScene(new Scene(vbox));
dialogStage.show();
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Sergey is correct, but if you need to get a response from your home-spun dialog(s) for evaluation in the same block of code that invoked it, you should use .showAndWait(), not .show(). Here's my rendition of a couple of the dialog types that are provided in Swing's OptionPane:

public class FXOptionPane {


public enum Response { NO, YES, CANCEL };


private static Response buttonSelected = Response.CANCEL;


private static ImageView icon = new ImageView();


static class Dialog extends Stage {
public Dialog( String title, Stage owner, Scene scene, String iconFile ) {
setTitle( title );
initStyle( StageStyle.UTILITY );
initModality( Modality.APPLICATION_MODAL );
initOwner( owner );
setResizable( false );
setScene( scene );
icon.setImage( new Image( getClass().getResourceAsStream( iconFile ) ) );
}
public void showDialog() {
sizeToScene();
centerOnScreen();
showAndWait();
}
}


static class Message extends Text {
public Message( String msg ) {
super( msg );
setWrappingWidth( 250 );
}
}


public static Response showConfirmDialog( Stage owner, String message, String title ) {
VBox vb = new VBox();
Scene scene = new Scene( vb );
final Dialog dial = new Dialog( title, owner, scene, "res/Confirm.png" );
vb.setPadding( new Inset(10,10,10,10) );
vb.setSpacing( 10 );
Button yesButton = new Button( "Yes" );
yesButton.setOnAction( new EventHandler<ActionEvent>() {
@Override public void handle( ActionEvent e ) {
dial.close();
buttonSelected = Response.YES;
}
} );
Button noButton = new Button( "No" );
noButton.setOnAction( new EventHandler<ActionEvent>() {
@Override public void handle( ActionEvent e ) {
dial.close();
buttonSelected = Response.NO;
}
} );
BorderPane bp = new BorderPane();
HBox buttons = new HBox();
buttons.setAlignment( Pos.CENTER );
buttons.setSpacing( 10 );
buttons.getChildren().addAll( yesButton, noButton );
bp.setCenter( buttons );
HBox msg = new HBox();
msg.setSpacing( 5 );
msg.getChildren().addAll( icon, new Message( message ) );
vb.getChildren().addAll( msg, bp );
dial.showDialog();
return buttonSelected;
}


public static void showMessageDialog( Stage owner, String message, String title ) {
showMessageDialog( owner, new Message( message ), title );
}
public static void showMessageDialog( Stage owner, Node message, String title ) {
VBox vb = new VBox();
Scene scene = new Scene( vb );
final Dialog dial = new Dialog( title, owner, scene, "res/Info.png" );
vb.setPadding( new Inset(10,10,10,10) );
vb.setSpacing( 10 );
Button okButton = new Button( "OK" );
okButton.setAlignment( Pos.CENTER );
okButton.setOnAction( new EventHandler<ActionEvent>() {
@Override public void handle( ActionEvent e ) {
dial.close();
}
} );
BorderPane bp = new BorderPane();
bp.setCenter( okButton );
HBox msg = new HBox();
msg.setSpacing( 5 );
msg.getChildren().addAll( icon, message );
vb.getChildren().addAll( msg, bp );
dial.showDialog();
}

}

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Update: JavaFX 8u40 includes simple Dialogs and Alerts!, check out this blog post which explains how to use the official JavaFX Dialogs!

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You can give dialog box which given by the JavaFX UI Controls Project. I think it will help you

Dialogs.showErrorDialog(Stage object, errorMessage,  "Main line", "Name of Dialog box");
Dialogs.showWarningDialog(Stage object, errorMessage,  "Main line", "Name of Dialog box");
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Update

Official standard dialogs are coming to JavaFX in release 8u40, as part of the implemenation of RT-12643. These should be available in final release form around March of 2015 and in source code form in the JavaFX development repository now.

In the meantime, you can use the ControlsFX solution below...

ControlsFX is the defacto standard 3rd party library for common dialog support in JavaFX (error, warning, confirmation, etc).

There are numerous other 3rd party libraries available which provide common dialog support as pointed out in some other answers and you can create your own dialogs easily enough using the sample code in Sergey's answer.

However, I believe that ControlsFX easily provide the best quality standard JavaFX dialogs available at the moment. Here are some samples from the ControlsFX documentation.

standard dialog

command links

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public myClass{


private Stage dialogStage;






public void msgBox(String title){
dialogStage = new Stage();
GridPane grd_pan = new GridPane();
grd_pan.setAlignment(Pos.CENTER);
grd_pan.setHgap(10);
grd_pan.setVgap(10);//pading
Scene scene =new Scene(grd_pan,300,150);
dialogStage.setScene(scene);
dialogStage.setTitle("alert");
dialogStage.initModality(Modality.WINDOW_MODAL);


Label lab_alert= new Label(title);
grd_pan.add(lab_alert, 0, 1);


Button btn_ok = new Button("fermer");
btn_ok.setOnAction(new EventHandler<ActionEvent>() {


@Override
public void handle(ActionEvent arg0) {
// TODO Auto-generated method stub
dialogStage.hide();


}
});
grd_pan.add(btn_ok, 0, 2);


dialogStage.show();


}






}
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Recently released JDK 1.8.0_40 added support for JavaFX dialogs, alerts, etc. For example, to show a confirmation dialog, one would use the Alert class:

Alert alert = new Alert(AlertType.CONFIRMATION, "Delete " + selection + " ?", ButtonType.YES, ButtonType.NO, ButtonType.CANCEL);
alert.showAndWait();


if (alert.getResult() == ButtonType.YES) {
//do stuff
}

Here's a list of added classes in this release:

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Adapted from answer here: https://stackoverflow.com/a/7505528/921224

javafx.scene.control.Alert

For a an in depth description of how to use JavaFX dialogs see: JavaFX Dialogs (official) by code.makery. They are much more powerful and flexible than Swing dialogs and capable of far more than just popping up messages.

import javafx.scene.control.Alert
import javafx.scene.control.Alert.AlertType;
import javafx.application.Platform;


public class ClassNameHere
{


public static void infoBox(String infoMessage, String titleBar)
{
/* By specifying a null headerMessage String, we cause the dialog to
not have a header */
infoBox(infoMessage, titleBar, null);
}


public static void infoBox(String infoMessage, String titleBar, String headerMessage)
{
Alert alert = new Alert(AlertType.INFORMATION);
alert.setTitle(titleBar);
alert.setHeaderText(headerMessage);
alert.setContentText(infoMessage);
alert.showAndWait();
}
}

One thing to keep in mind is that JavaFX is a single threaded GUI toolkit, which means this method should be called directly from the JavaFX application thread. If you have another thread doing work, which needs a dialog then see these SO Q&As: JavaFX2: Can I pause a background Task / Service? and Platform.Runlater and Task Javafx.

To use this method call:

ClassNameHere.infoBox("YOUR INFORMATION HERE", "TITLE BAR MESSAGE");

or

ClassNameHere.infoBox("YOUR INFORMATION HERE", "TITLE BAR MESSAGE", "HEADER MESSAGE");
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This works since java 8u40:

Alert alert = new Alert(AlertType.INFORMATION, "Content here", ButtonType.OK);
alert.getDialogPane().setMinHeight(Region.USE_PREF_SIZE);
alert.show();
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To make an example of Clairton Luz work, you need to run in the FXApplicationThread and insert into Platform.runLater method your code snippet:

  Platform.runLater(() -> {
Alert alert = new Alert(Alert.AlertType.ERROR);
alert.setTitle("Error Dialog");
alert.setHeaderText("No information.");


alert.showAndWait();
}
);

Otherwise, you'll get: java.lang.IllegalStateException: Not on FX application thread


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