How do I pass a value to a method that calls a new page in the Controller class of the method?

Others 2022-04-21 22:17:00 views: 0
Karishma Parmar :

I have a pane with 10 films, and every time the user clicks on a film thumbnail, I have a method that will take the user to a tickets page where they can select how many tickets they'd like to buy. However, I'm trying to figure out how to pass the Film object loadTicketPage in the Controller class for the called tickets page, when I call the film object from the movie page Controller. 

public class controller {
    public void initialize() {
        film1.setImage(getFilmFromList(0).getThumbnail());
        film2.setImage(getFilmFromList(1).getThumbnail());
        film3.setImage(getFilmFromList(2).getThumbnail());
        film4.setImage(getFilmFromList(3).getThumbnail());
        film5.setImage(getFilmFromList(4).getThumbnail());
        film6.setImage(getFilmFromList(5).getThumbnail());
        film7.setImage(getFilmFromList(6).getThumbnail());
        film8.setImage(getFilmFromList(7).getThumbnail());
        film9.setImage(getFilmFromList(8).getThumbnail());
        film10.setImage(getFilmFromList(9).getThumbnail());

    }

    public void loadTicketPage(Film film) {
        try {
            Parent root = FXMLLoader.load(getClass().getResource("ticketsPage.fxml"));

            Scene scene = new Scene(root);
            Stage stage = new Stage();

            stage.initModality(Modality.APPLICATION_MODAL);

            stage.setScene(scene);
            stage.setTitle("Ticket Page");
            stage.show();

        } catch (IOException e) {
            System.out.println(e);
        }
    }

    public void film1() {
        Double price = getFilmFromList(0).getPrice();
        String title = getFilmFromList(0).getFilmName();
        loadTicketPage(getFilmFromList(0));

    }

    public void film2() {
        Double price = getFilmFromList(1).getPrice();
        String title = getFilmFromList(1).getFilmName();
        loadTicketPage(getFilmFromList(1));
    }
}

public class TicketsPageController {
    public Label filmName;
    public Label filmDescription;

    public void initialize() {
        filmName.setText(film.getFilmTitle)
    }
}

Here is fxml file for the ticketsPage:

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.String?>
<?import javafx.collections.FXCollections?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.effect.SepiaTone?>
<?import javafx.scene.image.Image?>
<?import javafx.scene.image.ImageView?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>

<AnchorPane prefHeight="670.0" prefWidth="1000.0" style="-fx-background-color: maroon;" xmlns="http://javafx.com/javafx/8.0.172-ea" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.TicketsPageController">
   <children>
      <Label fx:id="lblHello" layoutX="308.0" layoutY="9.0" prefHeight="94.0" prefWidth="460.0" text="Hello! Welcome to Cinema Enterpriso" textAlignment="CENTER" textFill="WHITE" wrapText="true">
         <font>
            <Font name="Broadway" size="30.0" />
         </font>
      </Label>
      <ImageView fitHeight="141.0" fitWidth="297.0" layoutX="10.0" layoutY="10.0" pickOnBounds="true" preserveRatio="true">
         <image>
            <Image url="@images/University_of_Huddersfield_logo.jpg" />
         </image>
      </ImageView>
      <Button fx:id="btnOpenLogin" layoutX="770.0" layoutY="46.0" mnemonicParsing="false" onAction="#btnOpenLoginClick" style="-fx-background-color: tan;" text="Login">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnSignUp" layoutX="840.0" layoutY="46.0" mnemonicParsing="false" onAction="#btnCreateNewUser" style="-fx-background-color: tan;" text="Sign Up">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnBasket" layoutX="925.0" layoutY="46.0" mnemonicParsing="false" onAction="#btnOpenOrderSummary" style="-fx-background-color: tan;" text="Basket">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Label layoutX="35.0" layoutY="328.0" text="Please select your tickets:" textFill="WHITE">
         <font>
            <Font name="Broadway" size="24.0" />
         </font>
      </Label>
      <ComboBox fx:id="ticketType1" layoutX="51.0" layoutY="383.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="Adult"> </String>
               <String fx:value="Child"> </String>
               <String fx:value="Teen"> </String>
               <String fx:value="Student"> </String>
               <String fx:value="Senior"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="ticketType2" layoutX="51.0" layoutY="437.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="Adult"> </String>
               <String fx:value="Child"> </String>
               <String fx:value="Teen"> </String>
               <String fx:value="Student"> </String>
               <String fx:value="Senior"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="ticketType3" layoutX="51.0" layoutY="489.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="Adult"> </String>
               <String fx:value="Child"> </String>
               <String fx:value="Teen"> </String>
               <String fx:value="Student"> </String>
               <String fx:value="Senior"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="ticketType4" layoutX="51.0" layoutY="541.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="Adult"> </String>
               <String fx:value="Child"> </String>
               <String fx:value="Teen"> </String>
               <String fx:value="Student"> </String>
               <String fx:value="Senior"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="ticketType5" layoutX="51.0" layoutY="592.0" prefWidth="150.0" promptText="Ticket type" style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
          <items>
              <FXCollections fx:factory="observableArrayList">
                  <String fx:value="Adult"> </String>
                  <String fx:value="Child"> </String>
                  <String fx:value="Teen"> </String>
                  <String fx:value="Student"> </String>
                  <String fx:value="Senior"> </String>
              </FXCollections>
          </items>
      </ComboBox>
      <ComboBox fx:id="no1" layoutX="218.0" layoutY="383.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="no2" layoutX="217.0" layoutY="435.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">

         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="no3" layoutX="217.0" layoutY="488.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="no4" layoutX="218.0" layoutY="542.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <ComboBox fx:id="no5" layoutX="217.0" layoutY="594.0" prefHeight="31.0" prefWidth="79.0" promptText="no." style="-fx-background-color: tan;">
         <effect>
            <SepiaTone />
         </effect>
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="1"> </String>
               <String fx:value="2"> </String>
               <String fx:value="3"> </String>
               <String fx:value="4"> </String>
               <String fx:value="5"> </String>
               <String fx:value="6"> </String>
            </FXCollections>
         </items>
      </ComboBox>
      <Label fx:id="filmName" layoutX="521.0" layoutY="123.0" text="Film" textFill="WHITE">
         <font>
            <Font name="Broadway" size="30.0" />
         </font>
      </Label>
      <Label fx:id="filmDescription" layoutX="485.0" layoutY="189.0" text="Description" textFill="WHITE">
         <font>
            <Font name="Broadway" size="24.0" />
         </font>
      </Label>
      <Button fx:id="btnAddToOrder1" layoutX="325.0" layoutY="383.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder1" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnAddToOrder2" layoutX="325.0" layoutY="435.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder2" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnAddToOrder3" layoutX="325.0" layoutY="489.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder3" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnAddToOrder4" layoutX="325.0" layoutY="541.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder4" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnAddToOrder5" layoutX="325.0" layoutY="595.0" mnemonicParsing="false" onAction="#btnAddTicketToOrder5" style="-fx-background-color: tan;" text="Add to order" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
      <Button fx:id="btnBackHomepage" layoutX="485.0" layoutY="594.0" mnemonicParsing="false" onAction="#btnBackToHomePageClick" prefHeight="31.0" prefWidth="155.0" style="-fx-background-color: tan;" text="Back to Homepage" textFill="MAROON">
         <effect>
            <SepiaTone />
         </effect>
      </Button>
   </children>
</AnchorPane>

Here is the stacktrace:

Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2566)
    ... 45 more
Caused by: java.lang.NullPointerException
    at sample.TicketsPageController.setStuff(TicketsPageController.java:54)
    at sample.TicketsPageController.initialize(TicketsPageController.java:41)
    ... 55 more

Here is my TicketPageController

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.stage.Window;

import java.io.IOException;

public class TicketsPageController {
    public Label lblHello;
    public Button btnOpenLogin;
    public Button btnSignUp;
    public Button btnBasket;
    public Label filmName;
    public Label filmDescription;
    public ComboBox ticketType1;
    public ComboBox ticketType2;
    public ComboBox ticketType3;
    public ComboBox ticketType4;
    public ComboBox ticketType5;
    public ComboBox no1;
    public ComboBox no2;
    public ComboBox no3;
    public ComboBox no4;
    public ComboBox no5;
    public Button btnAddToOrder1;
    public Button btnAddToOrder2;
    public Button btnAddToOrder3;
    public Button btnAddToOrder4;
    public Button btnAddToOrder5;
    public Button btnBackHomepage;
    private String filmTitle;

    private Film film;

    public void initialize() {
          setStuff();
//        System.out.println(filmTitle);
          filmName.setText(filmTitle);
    }

//    public void setFilm(Film film) {
//        System.out.println("in set film");
//        this.film = film;
//
//    }

    public void setFilm(Film film) {
        this.film = film;
        filmName.setText(film.getFilmName());
    }

    public void setStuff() {
        System.out.println("test");
        filmTitle = film.getFilmName();
    }

    public String printFilm(){
        return film.getFilmName();
    }

    public void btnOpenLoginClick(ActionEvent actionEvent) {
        printFilm();
    }

    public void btnCreateNewUser(ActionEvent actionEvent) {
    }

    public void btnOpenOrderSummary(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder1(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder2(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder3(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder4(ActionEvent actionEvent) {
    }

    public void btnAddTicketToOrder5(ActionEvent actionEvent) {
    }

    public void btnBackToHomePageClick(ActionEvent actionEvent) throws IOException {
        Window mainWindow = btnBackHomepage.getScene().getWindow();
        Parent newRoot = FXMLLoader.load(getClass().getResource("homepage.fxml"));
        mainWindow.getScene().setRoot(newRoot);
    }
}
Samuel Philipp :

During the load process of the new Pane you can get the controller from the FXMLLoader and pass the film to it:

public void loadTicketPage(Film film){
    try {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("ticketsPage.fxml"));

        Scene scene = new Scene(loader.load());
        Stage stage = new Stage();

        stage.initModality(Modality.APPLICATION_MODAL);

        stage.setScene(scene);
        stage.setTitle("Ticket Page");

        // get the controller and set the film
        TicketsPageController controller = loader.getController();
        controller.setFilm(film);

        stage.show();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Assuming your controller looks like the following:

public class TicketsPageController {
    private Film film;

    public Label filmName;
    public Label filmDescription;

    public void setFilm(Film film) {
        this.film = film;
        filmName.setText(film.getFilmTitle());
    }
}

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