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How do I dynamically add javaFX shapes to a shared pane through its controller class?

I am creating an application which requires a graph consisting of nodes and edges to be displayed. Each node is represented by a Circle object and each edge is a Line.
I have multiple scenes in the application, but the graph needs to be displayed in more than one of these scenes. So, I have created a fxml file using scene builder which only consists of an anchor pane which I want to be able to display my graph on. I have included this fxml file in the other scenes that require the graph to be displayed, so that I can use one controller to add the graph to a single anchor pane which will be shared across many scenes.
However, when I add my circles and lines as children to the anchor pane using the controller, they are not visible. Using the debug tool I can see that they are indeed children of the anchor pane, but they are not being displayed. I can see objects that I add to the anchor pane using scene builder (for example, I used scene builder to add a circle to the anchor pane and I could see that when running my GUI, but none of the other children which I added via code).
To reduce the scope of the problem, I attempted to create a single circle and add it to the anchor pane through my controller class. Despite being a child of the anchor pane, this circle was not visible when running the GUI.
GraphPaneController.java
public class GraphPaneController {
#FXML Pane paneGraph;
public void addCircle() {
Circle circle = new Circle();
circle.setFill(Color.RED);
circle.setRadius(50);
circle.setCenterX(0);
circle.setCenterY(0);
paneGraph.getChildren().add(circle);
}
}
MainMenuController.java
public class MainMenuController {
public void startButtonClicked() {
FXMLLoader loader = new FXMLLoader(getClass().getResource("graph_pane.fxml"));
Parent root = loader.load();
GraphPaneController gpController = loader.getController();
controller.addCircle();
Frontend.setRoot("gamemode_select");
}
}
Frontend.java
public class Frontend extends Application {
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage mainStage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("mainmenu.fxml"));
Scene scene = new Scene(root, 600, 400);
mainStage.setScene(scene);
mainStage.show();
}
public static void setRoot(String fxml) throws IOException {
newScene.setRoot(loadFXML(fxml));
}
public static Parent loadFXML(String fxml) throws IOException {
FXMLLoader fxmlLoader = new FXMLLoader(Frontend.class.getResource(fxml + ".fxml"));
return fxmlLoader.load();
}
}
mainmenu.fxml
<VBox prefHeight="400.0" prefWidth="640.0" xmlns="http://javafx.com/javafx/19" xmlns:fx="http://javafx.com/fxml/1" fx:controller="graphvis.group30.MainMenuController">
<children>
<AnchorPane id="ap" maxHeight="-1.0" maxWidth="-1.0" prefHeight="-1.0" prefWidth="-1.0" VBox.vgrow="ALWAYS">
<children>
<ImageView fitHeight="400.0" fitWidth="640.0" opacity="0.19" pickOnBounds="true" />
<Label layoutX="198.0" layoutY="112.0" text="Graph Colouring Game">
<font>
<Font size="24.0" />
</font>
</Label>
<Button id="btnInputGraphFromFile" layoutX="255.0" layoutY="200.0" mnemonicParsing="false" onAction="#btnInputGraphFromFileClicked" prefHeight="25.0" prefWidth="130.0" text="Input graph from file" />
<Button id="btnCreateRandomGraph" layoutX="255.0" layoutY="235.0" mnemonicParsing="false" onAction="#btnCreateRandomGraphClicked" text="Create random graph" />
<Label layoutX="197.0" layoutY="138.0" prefHeight="61.0" prefWidth="245.0" text="Made by Nathan Macdonald, Kasper van der Horst, Oguz Kagan Yarim, Miriam Espinosa, Dorina Sili" textAlignment="CENTER" wrapText="true">
<font>
<Font size="10.0" />
</font>
</Label>
<Button layoutX="255.0" layoutY="269.0" mnemonicParsing="false" onAction="#btnQuitClicked" prefHeight="25.0" prefWidth="130.0" text="Quit" />
</children>
</AnchorPane>
</children>
</VBox>
graph_pane.fxml
<AnchorPane fx:id="paneGraph" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/19" xmlns:fx="http://javafx.com/fxml/1" fx:controller="graphvis.group30.GraphPaneController" />
gamemode_select.fxml
<VBox prefHeight="400.0" prefWidth="640.0" xmlns="http://javafx.com/javafx/19" xmlns:fx="http://javafx.com/fxml/1" fx:controller="graphvis.group30.GamemodeSelectController">
<children>
<AnchorPane maxHeight="-1.0" maxWidth="-1.0" prefHeight="-1.0" prefWidth="-1.0" VBox.vgrow="ALWAYS">
<children>
<fx:include source="graph_pane.fxml" />
<Label layoutX="139.0" layoutY="14.0" prefHeight="63.0" prefWidth="159.0" text="Select Gamemode:" wrapText="true">
<font>
<Font size="18.0" />
</font>
</Label>
<Button fx:id="btnGamemode1" layoutX="299.0" layoutY="33.0" mnemonicParsing="false" onAction="#btnGamemode1Clicked" text="untill death" />
<Button fx:id="btnGamemode2" layoutX="384.0" layoutY="33.0" mnemonicParsing="false" onAction="#btnGamemode2Clicked" text="timed" />
<Button fx:id="btnGamemode3" layoutX="440.0" layoutY="33.0" mnemonicParsing="false" onAction="#btnGamemode3Clicked" text="random " />
<Button fx:id="btnBack" layoutX="14.0" layoutY="360.0" mnemonicParsing="false" onAction="#btnBackClicked" text="back" />
</children>
</AnchorPane>
</children>
</VBox>
When viewing the gamemode select screen, I expect to see the circle that I added to the graph pane through the GraphPaneController, but it is not there. What do I do so that I can add visual components to a pane which is shared across multiple scenes?

So I got this to work by creating a model class (GraphModel) and a viewer class (GraphView) for the graph. The model class handles creating the vertices and edges, and the viewer class is reponsible for displaying the graph.
GraphView extends javafx.scene.layout.Pane and contains an AnchorPane attribute, containing the elements of the graph to be displayed, which can be added to scenes by calling a getAnchorPane method on the GraphView object.

Hbox has child Buttons , how to grab and addlisteners to them?

to start here's the FXML, a simple Hbox with Buttons inside :
<HBox fx:id="hboxOfCategories" alignment="CENTER_LEFT" spacing="10.0">
<children>
<Button maxHeight="1.7976931348623157E308" mnemonicParsing="false" prefHeight="57.0" prefWidth="82.0" text="Boissons" />
<Button layoutX="10.0" layoutY="10.0" maxHeight="1.7976931348623157E308" mnemonicParsing="false" prefHeight="57.0" prefWidth="82.0" text="Burger" />
<Button layoutX="102.0" layoutY="10.0" maxHeight="1.7976931348623157E308" mnemonicParsing="false" prefHeight="57.0" prefWidth="82.0" text="Tacos" />
<Button layoutX="378.0" layoutY="10.0" maxHeight="1.7976931348623157E308" mnemonicParsing="false" prefHeight="57.0" prefWidth="82.0" text="Pizza" />
<Button layoutX="194.0" layoutY="10.0" maxHeight="1.7976931348623157E308" mnemonicParsing="false" prefHeight="57.0" prefWidth="82.0" text="Baguette Farcie" textAlignment="CENTER" wrapText="true" />
<Button layoutX="286.0" layoutY="10.0" maxHeight="1.7976931348623157E308" mnemonicParsing="false" prefHeight="57.0" prefWidth="82.0" text="Souflee" />
</children>
</HBox>
i saved his content inside an Observable list , it had to be type Node because the .getChildren() method returns something that's type Node :
fxml controller code :
#FXML
private void initialize(){
ObservableList<Node> hboxButtons = hboxOfCategories.getChildren();
}
How can i grab those buttons and add a listener to them that triggers when the buttons are clicked ?
something like this :
hboxofCategories.getchildren().addlistener(e -> {
doEpicStuff();
});

This should do the trick :
for(Node button : hboxOfCategories.getChildren())
{
((Button)button).setOnAction(a -> {
System.out.println("Pressed : "+ ((Button)button).getText());
});
}
Output :
EDIT :
Here is how you can get the index :
for(int i=0;i<hboxOfCategories.getChildren().size();i++)
{
Button button=(Button)hboxOfCategories.getChildren().get(i);
int index=i;
button.setOnAction(a->
{
System.out.println("Name : "+button.getText()+" | Index : "+index);
});
}

Resizing window to accommodate an ImageView (JavaFX)

I am looking to resize the window to make fit an ImageView that changes size when a button is pressed. The ImageView is contained within an AnchorPane. I can't seem to find any resources that explain how to do this nor have I been able to find anything within SceneBuilder. Thanks!
<AnchorPane prefHeight="400" prefWidth="600" style="-fx-background-color: #282828;" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.Controller">
<children>
<HBox maxHeight="-Infinity" maxWidth="-Infinity" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.topAnchor="0.0">
<children>
<VBox prefHeight="200.0" prefWidth="100.0" style="-fx-background-color: #535353;">
<children>
<Pane prefHeight="50.0" prefWidth="100.0" />
<Button fx:id="topButton" mnemonicParsing="false" onAction="#handleTopButton" prefHeight="25.0" prefWidth="100.0" text="Top" />
<Button fx:id="sideButton" mnemonicParsing="false" onAction="#handleSideButton" prefHeight="25.0" prefWidth="100.0" text="Side" />
<Button fx:id="frontButton" mnemonicParsing="false" onAction="#handleFrontButton" prefHeight="25.0" prefWidth="100.0" text="Front" />
<Pane prefHeight="50.0" prefWidth="100.0" />
<Label fx:id="scaleLabel" prefHeight="17.0" prefWidth="103.0" text="Scale" textAlignment="CENTER" textFill="WHITE" />
<Slider fx:id="scale" max="3.0" min="1.0" />
<Label fx:id="sliceLabel" text="Slice" textAlignment="CENTER" textFill="WHITE" />
<Slider fx:id="slice" disable="true" />
<Pane prefHeight="50.0" prefWidth="100.0" />
<Button fx:id="mipButton" disable="true" mnemonicParsing="false" onAction="#handleMipButton" prefHeight="25.0" prefWidth="100.0" text="MIP" />
<Button mnemonicParsing="false" prefHeight="25.0" prefWidth="100.0" text="Histogram" />
<Button fx:id="exitButton" mnemonicParsing="false" onAction="#handleExitButton" prefHeight="25.0" prefWidth="100.0" text="Exit" />
</children>
</VBox>
<ImageView fx:id="imageView"/>
</children>
</HBox>
</children>

Use a container that respects the preferred size of its contained Node, e.g. BorderPane
Call method sizeToScene to resize the application window when you change the image (after a button click as you described in your question).
Here is a very minimal implementation of the above.
NOTE: Replace url with the actual URL of your image in the Image constructor in the below code.
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
public class ImgVwTst extends Application {
#Override
public void start(Stage primaryStage) throws Exception {
BorderPane root = new BorderPane();
Image img = new Image("url");
ImageView imgVw = new ImageView(img);
root.setCenter(imgVw);
HBox hBox = new HBox();
hBox.setAlignment(Pos.CENTER);
Button nextImageButton = new Button("next");
nextImageButton.setOnAction(e -> {Image img2 = new Image("url");
imgVw.setImage(img2);
primaryStage.sizeToScene();});
hBox.getChildren().add(nextImageButton);
root.setBottom(hBox);
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}

Scaling UI to fit application window using JavaFX and SceneBuilder 8

We're currently developing a social media platform as a project at school (to be handed in in 2 weeks), and we've ran into some issues when trying to get the UI to scale with the application window. Currently it works as supposed when previewing it in SceneBuilder (see the first link) , but it seems to be stuck in the upper left corner when running the actual application via IntelliJ IDEA. I've also linked a screenshot of how it's actual behavior is (second link).
This is how the scaling should work, and as you can see it does work when i use SceneBuilder's preview function.
This is how the scaling is working when we run the app, which isn't scaling at all.
At the moment we're just trying to understand whats wrong, therefore our only focus is the 'discover page' of the platform (you access the page from the events page). So i will post the fxml code for the discover page as well as the events controller. Bare in mind this is my first ever post on here, so if there's anything else that could help you help us just tell me and i'll get it uploaded! Here is a screenshot of all the classes in our project, if there's any other class that would be helpful if i post just say the word :)
All classes in the project.
FXML for the Discover page:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ChoiceBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TableColumn?>
<?import javafx.scene.control.TableView?>
<?import javafx.scene.control.TextArea?>
<?import javafx.scene.effect.DropShadow?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.text.Font?>
<?import javafx.scene.text.Text?>
<BorderPane fx:id="borderPaneDiscover" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="-Infinity" minWidth="-Infinity" prefHeight="600.0" prefWidth="900.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="JavaFX.DiscoverController">
<center>
<AnchorPane prefHeight="200.0" prefWidth="900.0" BorderPane.alignment="CENTER">
<children>
<TableView fx:id="tableViewDiscover" layoutY="62.0" onMouseClicked="#showDetails" prefHeight="331.0" prefWidth="900.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="65.0">
<columns>
<TableColumn fx:id="eventNameColumnDiscover" minWidth="180.0" prefWidth="75.0" text="Event name" />
<TableColumn fx:id="eventLocationColumnDiscover" minWidth="180.0" prefWidth="75.0" text="Event location" />
<TableColumn fx:id="eventDateColumnDiscover" minWidth="180.0" prefWidth="75.0" text="Event date" />
<TableColumn fx:id="eventCategoryColumnCategory" minWidth="180.0" prefWidth="75.0" text="Event category" />
<TableColumn fx:id="eventCreatorColumnDiscover" minWidth="180.0" prefWidth="75.0" text="Event Creator" />
</columns>
<columnResizePolicy>
<TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
</columnResizePolicy>
</TableView>
<Label alignment="CENTER" prefHeight="18.0" prefWidth="190.0" text="Choose category of the event:" textAlignment="CENTER" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" />
<ChoiceBox fx:id="choiceBoxDiscover" layoutX="375.0" layoutY="20.0" prefHeight="30.0" prefWidth="150.0" AnchorPane.leftAnchor="375.0" AnchorPane.rightAnchor="375.0" AnchorPane.topAnchor="20.0" />
<Button fx:id="buttonGo" layoutX="505.0" mnemonicParsing="false" onAction="#showTableDiscover" prefHeight="30.0" prefWidth="55.0" style="-fx-background-color: #313131; -fx-text-fill: #FFF; -fx-font-weight: BOLD;" text="Go" AnchorPane.rightAnchor="15.0" AnchorPane.topAnchor="20.0">
<effect>
<DropShadow />
</effect>
</Button>
</children>
</AnchorPane>
</center>
<bottom>
<AnchorPane prefHeight="145.0" prefWidth="900.0" BorderPane.alignment="CENTER">
<children>
<TextArea fx:id="textAreaDescription" editable="false" layoutX="60.0" layoutY="20.0" prefHeight="120.0" prefWidth="250.0" wrapText="true" AnchorPane.bottomAnchor="10.0" AnchorPane.leftAnchor="60.0" AnchorPane.rightAnchor="590.0" AnchorPane.topAnchor="20.0" />
<TextArea fx:id="textAreaParticipants" editable="false" layoutX="360.0" layoutY="20.0" prefHeight="120.0" prefWidth="250.0" wrapText="true" AnchorPane.bottomAnchor="10.0" AnchorPane.rightAnchor="290.0" AnchorPane.topAnchor="20.0" />
<Button fx:id="attendButton" layoutX="660.0" layoutY="45.0" mnemonicParsing="false" onAction="#attendEvent" prefHeight="50.0" prefWidth="100.0" style="-fx-background-color: #313131; -fx-text-fill: #ffffff; -fx-font-weight: BOLD;" text="Attend" AnchorPane.bottomAnchor="50.0" AnchorPane.rightAnchor="40.0" AnchorPane.topAnchor="45.0">
<effect>
<DropShadow />
</effect>
</Button>
<Text layoutX="65.0" layoutY="15.0" strokeType="OUTSIDE" strokeWidth="0.0" style="-fx-font-size: 14; -fx-font-weight: BOLD;" text="Description:" AnchorPane.leftAnchor="60.0" AnchorPane.topAnchor="2.0">
<font>
<Font name="Segoe UI Symbol" size="14.0" />
</font>
</Text>
<Text layoutX="365.0" layoutY="15.0" strokeType="OUTSIDE" strokeWidth="0.0" style="-fx-font-size: 14; -fx-font-weight: BOLD;" text="Participants:" AnchorPane.rightAnchor="457.0" AnchorPane.topAnchor="2.0">
<font>
<Font name="Segoe UI Symbol" size="14.0" />
</font>
</Text>
</children>
</AnchorPane>
</bottom>
<top>
<AnchorPane prefHeight="16.0" prefWidth="900.0" BorderPane.alignment="CENTER">
<children>
<Label alignment="CENTER" contentDisplay="CENTER" layoutX="315.0" prefHeight="54.0" prefWidth="289.0" text="Discover events" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0">
<font>
<Font name="System Bold" size="36.0" />
</font>
</Label>
<Button alignment="CENTER_RIGHT" layoutX="833.0" layoutY="10.0" mnemonicParsing="false" onAction="#BackToEvents" prefHeight="34.0" prefWidth="55.0" style="-fx-background-color: #313131; -fx-text-fill: #FFF; -fx-font-size: 14; -fx-font-weight: BOLD;" text="Back" AnchorPane.rightAnchor="15.0" AnchorPane.topAnchor="10.0">
<font>
<Font name="Segoe UI Symbol" size="20.0" />
</font>
<effect>
<DropShadow />
</effect>
</Button>
</children>
</AnchorPane>
</top>
</BorderPane>
FXML for the events page:
package JavaFX;
import javafx.collections.*;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import java.io.IOException;
public class EventsController {
private ObservableList<String> usersChoice = FXCollections.observableArrayList("My events(attended/to attend and created)", "Discover(search by category and attend)", "Create event");
#FXML
private BorderPane eventsPane;
#FXML
private ChoiceBox <String> choicebox;
#FXML
private Label labelOfUserChoice;
#FXML
private void initialize(){
choicebox.setItems(usersChoice);
//choicebox.getSelectionModel().selectedItemProperty().addListener(changeListener);
}
#FXML
private void changeLabel() throws IOException/*, InterruptedException*/{
switch (choicebox.getValue()) {
//ask sokol about it
case ("My events(attended/to attend and created)"):
labelOfUserChoice.setText("You have chosen: " + choicebox.getValue());
choicebox.setDisable(true);
//TimeUnit.SECONDS.sleep(5);
loadMyEvents();
break;
case ("Discover(search by category and attend)"):
labelOfUserChoice.setText("You have chosen: " + choicebox.getValue());
choicebox.setDisable(true);
//TimeUnit.SECONDS.sleep(1);
loadDiscover();
break;
case ("Create event"):
labelOfUserChoice.setText("You have chosen: " + choicebox.getValue());
//TimeUnit.SECONDS.sleep(1);
loadCreateEvent();
break;
default:
System.out.println("YOU'VE BETTER LEARN HOW TO USE JFX!");
}
}
#FXML
private void goToMainMenu(ActionEvent event) throws IOException {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/resources/mainMenu.fxml"));
BorderPane pane = loader.load();
eventsPane.getChildren().setAll(pane);
}
#FXML
private void goToProfile(ActionEvent event) throws IOException {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/resources/profile.fxml"));
BorderPane pane = loader.load();
eventsPane.getChildren().setAll(pane);
}
#FXML
private void goToFriends(ActionEvent event) throws IOException {
FXMLLoader loader = new FXMLLoader(getClass().getResource("/resources/friendsPage.fxml"));
loader.setLocation(getClass().getResource("/resources/friendsPage.fxml"));
BorderPane pane = loader.load();
eventsPane.getChildren().setAll(pane);
}
#FXML
private void goToChat(ActionEvent event) throws IOException {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/chatclient/FXMLDocument.fxml"));
BorderPane pane = loader.load();
eventsPane.getChildren().setAll(pane);
}
private void loadMyEvents() throws IOException {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/resources/myEvents.fxml"));
BorderPane pane = loader.load();
eventsPane.getChildren().setAll(pane);
}
private void loadDiscover() throws IOException{
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/resources/discover.fxml"));
BorderPane pane = loader.load();
eventsPane.getChildren().setAll(pane);
}
private void loadCreateEvent() throws IOException{
FXMLLoader loader = new FXMLLoader();
loader.setLocation(getClass().getResource("/resources/createEvent.fxml"));
BorderPane pane = loader.load();
eventsPane.getChildren().setAll(pane);
}
}
So far i've read probably all the posts in here that are issues remotely like ours, but none of them have seemed to work. I haven't been able to find a post stating the exact same issue as ours, where the preview window in SceneBuilder works as supposed and the program when we run it doesn't. I hope someone can help us out, thanks in advance! :)

passing parametres to FXML file from the controller

Hello I'm new to javaFX, and trying to create a simulation application of the scheduling algorithms.
I did the logic package, but still have problems with the UI. what i want to do is to allow the user to enter the number of jobs and in the next window i want to display text fields where he can put the executing time of each job, in other words i should display the text fields n time as the number of jobs given by the user.
this is what i did for the first interface :
<?xml version="1.0" encoding="UTF-8"?>
<GridPane xmlns:fx="http://javafx.com/fxml/1" alignment="center" hgap="10" styleClass="mainFxmlClass" vgap="10" fx:controller="ui.FXMLController">
<padding><Insets bottom="10" left="25" right="25" top="25" /></padding>
<stylesheets>
<URL value="#fxml.css" />
</stylesheets>
<children>
<Text id="welcome-text" text="Welcome" GridPane.columnIndex="0" GridPane.columnSpan="2" GridPane.rowIndex="0" />
<Label text="Le nombre de Processus:" GridPane.columnIndex="0" GridPane.rowIndex="1" />
<TextField fx:id="textField" GridPane.columnIndex="1" GridPane.rowIndex="1" />
<Label text="Choisissez un Algorithm d'Ordonancement :" GridPane.columnIndex="0" GridPane.rowIndex="2" />
<HBox alignment="bottom_right" spacing="10" GridPane.columnIndex="1" GridPane.rowIndex="5" />
<Text fx:id="actiontarget" GridPane.columnIndex="1" GridPane.rowIndex="7" />
<Button onAction="#handleButtonAction" text="Next" GridPane.columnIndex="1" GridPane.rowIndex="4" />
<MenuButton mnemonicParsing="false" prefHeight="25.0" prefWidth="150.0" text="Algo ... " GridPane.columnIndex="1" GridPane.rowIndex="2">
<items>
<MenuItem mnemonicParsing="true" text="Fifo" onAction="#handleButtonAction" />
<MenuItem mnemonicParsing="false" text="Tourniquet" />
<MenuItem mnemonicParsing="false" text="PCTER" />
<MenuItem mnemonicParsing="false" text="PCTE" />
</items>
</MenuButton>
</children>
</GridPane>
this is my controller :
public class FXMLController implements Initializable {
#FXML
private Label label;
#FXML
private Button button;
#FXML
private TextField textField;
#FXML
private Integer i;
#FXML
public void handleButtonAction() throws IOException{
String t = textField.getText();
IntegerStringConverter a = new IntegerStringConverter();
this.i = a.fromString(t);
Parent window = FXMLLoader.load(getClass().getResource("FXML1.fxml"));
Scene secondScene = new Scene(window);
Stage stage = new Stage();
stage.setScene(secondScene);
stage.show();
stage.show();
}
}
i dont know if there is a way to pass parameters from the controller to the FXML file and to do a loop in the FXML.. please help

If I understand you correctly, you want to request user input and create nodes in the GUI according to the input.
You can't create loops respectively control structures in a fxml file, but you can dynamically add and remove nodes (i.e. TextFields) by
defining a Vertical Box / Horizontal Box,
<VBox id="HBox" fx:id="myVBox" ...>
get the input as an integer,
int sum = Integer.parseInt(textField.getText());
and add the nodes in a for-loop,
for(int i=0, i<sum, i++) {
myVBox.getChildren().add(new TextField("executing time"));
}
and update the view.
Hope it helps.

AFAIK, you can't do that. You have to reverse the controL flow:
The controller should create the necessary controls (labels, textfields etc.) in a loop, possibly using a different FXML, which just defines that part.