javaFX :: popup window launches, but controller doesn't...? - javafx

Question

I am writing an app where I need the same custom popup window to appear when different buttons are clicked. Right now the popup is just a simple "Are You Sure? OK/Cancel" window, but later it will expand to include more customized features... so I can't use the quickie Dialog built-ins.
Here's the weird thing. When Button X is pushed, the popUp (defined in FXML) launches just fine, but my controller class doesn't seem to be running. I didn't think that you could do that. What I can't figure out is why the controller isn't running. I would have thought the app would crash if the controller wasn't working.
Here' the code a button will call to launch the popup:
private void popUpLaunch(Button caller){
Stage popUpStage = new Stage();
Parent root;
try {
root = FXMLLoader.load(getClass().getResource("popUp1.fxml"));
popUpStage.setScene(new Scene(root));
popUpStage.initModality(Modality.APPLICATION_MODAL); // popup
popUpStage.initOwner(caller.getScene().getWindow());
popUpStage.showAndWait();
} catch (IOException e) {
e.printStackTrace();
}
}
All of that works great. Here's the complete FXML, /src/sl/view/popUp1.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>
<?import javafx.scene.text.Text?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="130.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sl.view.PopUp1Controller">
<children>
<Text fx:id="popUpMessageText" layoutX="14.0" layoutY="14.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Message Goes Here" textAlignment="CENTER" wrappingWidth="577.6708984375" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<font>
<Font size="38.0" />
</font>
</Text>
<Button fx:id="btnPopUpOK" layoutX="126.0" layoutY="68.0" mnemonicParsing="false" prefHeight="31.0" prefWidth="157.0" text="OK" />
<Button fx:id="btnPopUpCancel" layoutX="286.0" layoutY="68.0" mnemonicParsing="false" prefHeight="31.0" prefWidth="169.0" text="Cancel" />
</children>
</AnchorPane>
The window loads just fine. And finally, here's the complete controller, /src/sl/view/PopUp1Controller.java:
package sl.view;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.text.Text;
import javafx.stage.Stage;
public class PopUp1Controller {
#FXML Text popUpMessageText;
#FXML Button btnPopUpOK;
#FXML Button btnPopUpCancel;
Stage stage;
public void start(Stage stage) throws Exception{
System.out.println("Popup controller launched!"); // never reach this... so the controller is not launching???
this.stage = stage;
popUpMessageText.setText("Interesting message here!");
btnPopUpOK.setOnAction(event -> {
System.out.println("You cliced OK...");
});
btnPopUpCancel.setOnAction(event -> {
System.out.println("You cliced Cancel");
stage.close();
});
}
}
Some thoughts...
I used SceneBuilder to generate the FXML. When I assigned the Controller Class for that AnchorPane, I picked "sl.view.PopUp1Controller" from the drop-down menu. So I'm pretty sure that's right.
Also: I've looked through the other "JavaFX Popup" posts, but I don't see one that specifically addresses my issue. A lot of post are like the below post which are basically, "Why not use these other popup options rather than re-invent the wheel?" e.g.:
JavaFX 2 custom popup pane
In my case, I do want to reinvent the wheel, because I need my popups to carry more-then-usual functionality, they will not be simple dialog boxes.

Answer 1

If you want code in a controller to execute when the controller is initialized, put it in the initialize() method (see the documentation):
public class PopUp1Controller {
#FXML Text popUpMessageText;
#FXML Button btnPopUpOK;
#FXML Button btnPopUpCancel;
public void initialize() {
System.out.println("Popup controller launched!"); // never reach this... so the controller is not launching???
popUpMessageText.setText("Interesting message here!");
btnPopUpOK.setOnAction(event -> {
System.out.println("You cliced OK...");
});
btnPopUpCancel.setOnAction(event -> {
System.out.println("You cliced Cancel");
btnPopupCancel.getScene().getWindow().hide();
});
}
}