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javafx TreeTableView string array columns

All existing answers were using a class object to display multiple columns. Do I have to use a class? Can I just use a string array like C#'s ListViewItem? If I can, how?
For example, display "hello" in the first column and "world" in the second column.
public class HelloController {
#FXML
private TreeTableView mytree;
#FXML
private TreeTableColumn colFirst;
#FXML
private TreeTableColumn colSecond;
#FXML
void initialize()
{
TreeItem<String[]> item = new TreeItem<String[]>(new String[]{"hello", "world"});
colFirst.setCellValueFactory((CellDataFeatures<Object, String[]> p)
-> new ReadOnlyStringWrapper(p.getValue().toString()));
mytree.setRoot(item);
}
}
fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<VBox alignment="CENTER" spacing="20.0" xmlns="http://javafx.com/javafx/17" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.example.fx2.HelloController">
<TreeTableView fx:id="mytree" prefHeight="200.0" prefWidth="200.0">
<columns>
<TreeTableColumn id="colFirst" prefWidth="75.0" text="First" />
<TreeTableColumn id="colSecond" prefWidth="75.0" text="Second" />
</columns>
</TreeTableView>
</VBox>

Never use raw types: parameterize your types properly:
public class HelloController {
#FXML
private TreeTableView<String[]> mytree;
#FXML
private TreeTableColumn<String[], String> colFirst;
#FXML
private TreeTableColumn<String[], String> colSecond;
// ...
}
Then in the lambda expression, p is a TreeTableColumn.CellDataFeatures<String[], String>, so p.getValue() is a TreeItem<String[]> and p.getValue().getValue() is the String[] representing the row.
So you can do
#FXML
void initialize() {
TreeItem<String[]> item = new TreeItem<String[]>(new String[]{"hello", "world"});
colFirst.setCellValueFactory(p
-> new ReadOnlyStringWrapper(p.getValue().getValue()[0]));
mytree.setRoot(item);
}

How to know which button is bieng clicked in javafx

How to know which button has envoked the function. I have read other answers on stackoverflow like this one . I tried creating a new button and giving it a value of event.getSource() but it is not working
#FXML
Button v1;
#FXML
Button v2;
#FXML
Button v3;
#FXML
Button v4;
#FXML
Button v5;
#FXML
Button v6;
public void printButton(ActionEvent event){
Button sourceButton = (Button) event.getSource();
if(sourceButton == v1){
System.out.print("v1");
}
else if(sourceButton == v2){
System.out.print("v2");
}
else if(sourceButton == v3){
System.out.print("v3");
}
else if(sourceButton == v4){
System.out.print("v4");
}
else if(sourceButton == v5){
System.out.print("v5");
}
else if(sourceButton == v6){
System.out.print("v6");
}
}
I have created the button in fxml and it calls the same function printButton();

This answer is using java 8 update 211 for testing.
The comments are suggesting that changing == to .equals() was the solution to this. However, Button does not override .equals(), so both of those ways are doing effectively the same thing.
Running up the sample application below to test resulted in all of the 3 buttons working as expected. Therefore, there may have been something incorrect in the FXML file with OP's code, which (as I write this) has not been shown from OP.
In the example below, note that the fxml file:
Specifies the controller with fx:controller="sample.Controller"
Contains 3 buttons with their ids matching exactly to the ones declared in Controller
On each button, includes onAction="#printButton" , and the name in quotes matches the method name in Controller onAction="#printButton".
Please note all of these are within the same package.
Main.java:
package sample;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Controller.java
package sample;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
public class Controller {
#FXML
Button v1;
#FXML
Button v2;
#FXML
Button v3;
public void printButton(ActionEvent event){
Button sourceButton = (Button) event.getSource();
if(sourceButton.equals(v1)){
System.out.print("v1");
}
else if(sourceButton == v2){
System.out.print("v2");
}
else if(sourceButton == v3){
System.out.print("v3");
}
}
}
sample.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.HBox?>
<?import javafx.scene.layout.VBox?>
<VBox alignment="CENTER" spacing="10.0" xmlns="http://javafx.com/javafx/10.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<padding>
<Insets bottom="20.0" left="20.0" right="20.0" top="20.0"/>
</padding>
<HBox alignment="CENTER" spacing="10.0">
<Button fx:id="v1" mnemonicParsing="false" onAction="#printButton" text="Button 1"/>
<Button fx:id="v2" mnemonicParsing="false" onAction="#printButton" text="Button 2"/>
<Button fx:id="v3" mnemonicParsing="false" onAction="#printButton" text="Button 3"/>
</HBox>
<Label text="Source:"/>
<Label fx:id="lblSource"/>
</VBox>

make your life easy how about using isPressed() function ?
if( v1.isPressed() ) {
name2 = n1.getText();
System.out.println(" V1 got called ");
}
v1.isPressed(); means check whether v1 has been clicked or not it return true or false
i'm not sure about also v1.isfire(); I think this one can make auto click

JavaFx actions between controllers

How i can do button action for editing TableView. I need to put text from TextArea to table when i touch button. And if put System.out.println in inputToTable() it is work.
public class InputController {
public TextArea inputArea;
public Button inputButton;
private TableController tableController;
public void initialize() {
tableControllerInit();
}
public void inputToTable() {
if(inputArea.getText() != "") {
tableController.tableInfo.setItems(FXCollections.observableArrayList(new InputObject(inputArea.getText())));
}
}
private void tableControllerInit() {
try {
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("table.fxml"));
fxmlLoader.load();
tableController = fxmlLoader.getController();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public class TableController {
#FXML TableView<InputObject> tableInfo;
#FXML TableColumn<InputObject, String> col1;
public void initialize() {
col1.setCellValueFactory(new PropertyValueFactory<>("text"));
}
}
public class Controller implements Initializable {
#Override
public void initialize(URL location, ResourceBundle resources) {
}
}
public class InputObject {
String text;
public InputObject(String text) {
this.text = text;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
}
<BorderPane fx:controller="sample.Controller" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1">
<left>
<fx:include source="table.fxml"/>
</left>
<center>
<fx:include source="input.fxml"/>
</center>
</BorderPane>
<TableView fx:controller="sample.TableController" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:id="tableInfo" prefHeight="400.0" prefWidth="330.0">
<columns>
<TableColumn fx:id="col1" prefWidth="75.0" text="Output" />
</columns>
<columnResizePolicy>
<TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
</columnResizePolicy>
</TableView>
<VBox fx:controller="sample.InputController" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" alignment="TOP_CENTER" prefHeight="200.0" prefWidth="100.0" BorderPane.alignment="CENTER">
<children>
<TextArea fx:id="inputArea" prefHeight="188.0" prefWidth="270.0" />
<Button fx:id="inputButton" onAction="#inputToTable" mnemonicParsing="false" text="Input">
<VBox.margin>
<Insets bottom="30.0" left="30.0" right="30.0" top="30.0" />
</VBox.margin>
</Button>
</children>
</VBox>

You load table.fxml twice: once via the fx:include in the main FXML file, and once in InputController, via the FXMLLoader you create in the tableControllerInit() method. Consequently, two instances of TableController are created, one associated with the first UI you load from table.fxml, and one associated with the second UI you load from table.fxml.
The UI you load via the fx:include is displayed in the VBox defined in the main FXML file. The UI you load with the FXMLLoader is never displayed (in fact, you never even keep a reference to it, you just call loader.load() and discard the result). When you try to update the table's items (do you really intend to replace all the existing items, by the way?), you refer to the second controller instance, which is associated with the UI which is never displayed. Consequently, you are updating a table that is not displayed, and you never see any results.
What you really need to do is share the same data between the two controllers associated with the two fx:includes. You can do this simply by injecting those two controllers into the main controller, as described in the "Nested Controllers" section in the documentation.
First, give the fx:include elements fx:id attributes:
<BorderPane fx:controller="sample.Controller" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1">
<left>
<fx:include fx:id="table" source="table.fxml"/>
</left>
<center>
<fx:include fx:id="input" source="input.fxml"/>
</center>
</BorderPane>
Then you can inject the controllers into the main controller by creating fields with the word "Controller" appended to the fx:id. Create a single observable list, which will represent the list of items displayed in the table, and pass it to each controller:
public class Controller implements Initializable {
#FXML
private TableController tableController ;
#FXML
private InputController inputController ;
#Override
public void initialize(URL location, ResourceBundle resources) {
ObservableList<InputObject> items = FXCollections.observableArrayList();
tableController.setTableItems(items);
inputController.setTableItems(items);
}
}
Finally, just define the obvious methods in each of the other two controllers:
public class TableController {
#FXML
private TableView<InputObject> tableInfo;
#FXML
private TableColumn<InputObject, String> col1;
public void initialize() {
col1.setCellValueFactory(new PropertyValueFactory<>("text"));
}
public void setTableItems(ObservableList<InputObject> tableItems) {
tableInfo.setItems(tableItems);
}
}
Now the table is displaying the contents of the items list created in the main controller's initalize() method, and the InputController has a reference to the same list. So all you need to do is update that list in the InputController. I assume you just want to add items to the table (not replace them all):
public class InputController {
#FXML
private TextArea inputArea;
#FXML
private Button inputButton;
private ObservableList<InputObject> tableItems ;
public void setTableItems(ObservableList<InputObject> tableItems) {
this.tableItems = tableItems ;
}
public void inputToTable() {
if(! inputArea.getText().isEmpty()) {
tableItems.add(new InputObject(inputArea.getText()));
}
}
}
More generally, if you have more data to share among the different controllers, you would create one or more "model" classes and share a model instance with the controllers. Then you can observe the properties of the model and update them. See Applying MVC With JavaFx for a more comprehensive example.

JavaFx element not binding to controller variable on fx:id [duplicate]

This question already has answers here:
JavaFX FXML controller - constructor vs initialize method
(3 answers)
Closed 6 years ago.
This is likely pilot error, but the FXML attribute is not binding to the controller class on fx:id. I've whittled it down to a trivial example, but still "no joy". What am I overlooking?
FXML file...
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.BorderPane?>
<BorderPane fx:id="mainFrame" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.controller.BorderPaneCtrl">
<left>
<AnchorPane fx:id="anchorPaneLeft" prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER" />
</left>
</BorderPane>
The associated Java code is...
package sample.controller;
import javafx.fxml.FXML;
import javafx.scene.layout.AnchorPane;
public class BorderPaneCtrl {
#FXML private AnchorPane anchorPaneLeft;
public BorderPaneCtrl() {
/* so, #FXML-annotated variables are accessible, but not
* yet populated
*/
if (anchorPaneLeft == null) {
System.out.println("anchorPaneLeft is null");
}
}
/* this is what was missing...added for "completeness"
*/
#FXML
public void initialize() {
/* anchorPaneLeft has now been populated, so it's now
* usable
*/
if (anchorPaneLeft != null) {
// do cool stuff
}
}
Ego is not an issue here, I'm pretty sure I'm overlooking something simple.

FXML elements are not assigned yet in constuctor, but you can use Initializable interface where elements are already assigned.
public class Controller implements Initializable {
#FXML
AnchorPane anchorPaneLeft;
public Controller() {
System.out.println(anchorPaneLeft); //null
}
#Override
public void initialize(URL location, ResourceBundle resources) {
System.out.println(anchorPaneLeft); //AnchorPane
}
}
I assume that you know that you should create controllers with FXML by using for example: FXMLLoader.load(getClass().getResource("sample.fxml");

Adding a list of specific node on a custom JavaFX FXML control

I'm trying to create a toolbar in JavaFX to add buttons using FXML like this:
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.net.*?
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import com.supridatta.javafx.*?>
<BorderPane xmlns:fx="http://javafx.com/fxml/1" prefHeight="200" prefWidth="320" fx:controller="com.supridatta.javafx.MainController">
<stylesheets>
<URL value="#main.css"/>
</stylesheets>
<top>
<com.supridatta.javafx.ButtonBar fx:id="buttonBar">
<buttons>
<ButtonBarButton path="/com/supridatta/javafx/icons/plus.png"/>
<ButtonBarButton path="/com/supridatta/javafx/icons/minus.png"/>
<ButtonBarButton path="/com/supridatta/javafx/icons/last.png"/>
</buttons>
</com.supridatta.javafx.ButtonBar>
</top>
<bottom>
<Button text="Exibir todos" onAction="#showAllButtons"/>
</bottom>
</BorderPane>
Here is the corresponding java class:
package com.supridatta.javafx;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.geometry.Pos;
import javafx.scene.Node;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
public class ButtonBar extends StackPane {
private final HBox contentPane = new HBox();
private final ObservableList<ButtonBarButton> buttons = FXCollections.observableArrayList();
public ButtonBar() {
initButtonBar();
}
private void initButtonBar() {
getChildren().add(contentPane);
setAlignment(Pos.CENTER);
buttons.addListener(new ListChangeListener<Node>() {
#Override
public void onChanged(ListChangeListener.Change<? extends Node> c) {
while (c.next()) {
if (c.wasAdded()) {
for (Node node : c.getAddedSubList()) {
contentPane.getChildren().add(node);
}
}
if (c.wasRemoved()) {
for (Node node : c.getAddedSubList()) {
contentPane.getChildren().remove(node);
}
}
}
}
});
}
public void setButtons(ObservableList<ButtonBarButton> contents) {
this.buttons.setAll(contents);
}
public ObservableList<ButtonBarButton> getButtons() {
return buttons;
}
public void addButton(ButtonBarButton button) {
buttons.add(button);
}
public void removeButton(ButtonBarButton button) {
buttons.remove(button);
}
}
When I run the project I'm getting this exception:
java.lang.IllegalArgumentException: Unable to coerce ButtonBarButton#2fd0ac8f[styleClass=button ButtonBarButton]'' to
interface javafx.collections.ObservableList.
Thanks in advance.

Since you have a setButtons method defined, the FXMLLoader is going to attempt to pass in the value defined by the elements inside <buttons>...</buttons> to that method. (See Introduction to FXML, and note in particular "A read-only list property is a Bean property whose getter returns an instance of java.util.List and has no corresponding setter method." - my emphasis.)
If you have a getButtons() method returning a list, and no setButtons method, then the FXMLLoader will do what you want, and pass the value corresponding to each element to the add method invoked on the result of calling getButtons(). I.e. it does
getButtons().add(new ButtonBarButton(...));
getButtons().add(new ButtonBarButton(...));
...
You either want it to do this, or you want it to do
setButtons(FXCollections.observableArrayList(new ButtonBarButton(...), new ButtonBarButton(...), ...));
So you have two fixes: either remove the setButtons(...) method from ButtonBar, or arrange to pass in an ObservableList:
<buttons>
<FXCollections fx:factory="observableArrayList">
<ButtonBarButton path="/com/supridatta/javafx/icons/plus.png"/>
<ButtonBarButton path="/com/supridatta/javafx/icons/minus.png"/>
<ButtonBarButton path="/com/supridatta/javafx/icons/last.png"/>
</FXCollections>
</buttons>