JavaFX can't show contextmenu in FXML Application - contextmenu

Question

i'm beginning with JavaFX.
I'm testing to create a FXML project and trying to display a context menu when i click into a row of the tableview, but i can´t see my context menu.
My code is:
package fxmltableview;
import java.net.URL;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ResourceBundle;
import javafx.beans.binding.Bindings;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableRow;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
/**
*
* #author aCedano
*/
public class FXMLTableViewController implements Initializable {
#FXML private TableView<Person> tableView;
#FXML private TableColumn<Person, String> firstNameColumn;
#FXML private TableColumn<Person, String> lastNameColumn;
#FXML private TableColumn<Person, String> testColumn;
#FXML private ContextMenu resultadoContextMenu;
Connection con;
private DBClass objDbClass;
private ObservableList<Person> data;
#Override
public void initialize(URL location, ResourceBundle resources) {
assert tableView != null : "fx:id=\"tableView\" was not injected: check your FXML file...";
firstNameColumn.setCellValueFactory(new PropertyValueFactory<>("test"));
lastNameColumn.setCellValueFactory(new PropertyValueFactory<>("firstName"));
testColumn.setCellValueFactory(new PropertyValueFactory<>("lastName"));
objDbClass = new DBClass();
try{
con = objDbClass.getConnection();
buildData();
tableView.setRowFactory(
(TableView<Person> tableView1) -> {
final TableRow<Person> row = new TableRow<>();
final ContextMenu rowMenu = new ContextMenu();
MenuItem editItem = new MenuItem("Edit");
MenuItem removeItem = new MenuItem("Delete");
removeItem.setOnAction((ActionEvent event) -> {
tableView1.getItems().remove(row.getItem());
});
rowMenu.getItems().addAll(editItem, removeItem);
row.contextMenuProperty().bind(
Bindings.when(Bindings.isNotNull(row.itemProperty()))
.then(rowMenu)
.otherwise((ContextMenu)null));
return row;
});
tableView.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent e) -> {
if (e.getButton() == MouseButton.SECONDARY)
resultadoContextMenu.show(tableView, e.getScreenX(), e.getScreenY());
});
}
catch(ClassNotFoundException | SQLException ce){
}
}
//Populate table
public void buildData(){
data = FXCollections.observableArrayList();
try{
String SQL = "Select * from tbltest Order By test";
ResultSet rs = con.createStatement().executeQuery(SQL);
while(rs.next()){
Person cm = new Person();
cm.setFirstName(rs.getString("test"));
cm.setLastName(rs.getString("nombre"));
cm.setTest(rs.getString("apellido"));
data.add(cm);
}
tableView.setItems(data);
tableView.getItems();
}
catch(SQLException e){
System.out.println("Error on Building Data");
}
}
}
I'm using Scene builder and my FXML file is:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.effect.*?>
<?import javafx.scene.text.*?>
<?import javafx.scene.paint.*?>
<?import javafx.geometry.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.cell.*?>
<?import javafx.collections.*?>
<?import fxmltableview.*?>
<!--/*<AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" fx:controller="fxmltableview.FXMLDocumentController">
<children>
<Button layoutX="126" layoutY="90" text="Click Me!" onAction="#handleButtonAction" fx:id="button" />
<Label layoutX="126" layoutY="120" minHeight="16" minWidth="69" fx:id="label" />
</children>
</AnchorPane>*/-->
<GridPane alignment="CENTER" hgap="10.0" prefHeight="689.0" prefWidth="710.0" vgap="10.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="fxmltableview.FXMLTableViewController">
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
<children>
<Button mnemonicParsing="false" text="Button" GridPane.rowIndex="1">
<effect>
<DropShadow />
</effect>
</Button>
<Label style="-fx-font: NORMAL 20 Tahoma;" text="Address Book" textOverrun="CENTER_ELLIPSIS" GridPane.rowIndex="2">
<font>
<Font name="Gill Sans MT Bold" size="13.0" />
</font>
<textFill>
<LinearGradient endX="1.0" endY="1.0" startX="0.5769230769230769">
<stops>
<Stop color="BLACK" />
<Stop color="WHITE" offset="1.0" />
</stops>
</LinearGradient>
</textFill></Label>
<TableView fx:id="tableView" prefHeight="265.0" prefWidth="502.0" tableMenuButtonVisible="true" GridPane.columnIndex="0" GridPane.rowIndex="3">
<columns>
<TableColumn fx:id="firstNameColumn" prefWidth="100" text="First Name">
<cellValueFactory>
<PropertyValueFactory property="firstName" />
</cellValueFactory>
<contextMenu>
<ContextMenu fx:id="resultadoContextMenu">
<items>
<MenuItem mnemonicParsing="false" text="Unspecified Action" />
</items>
</ContextMenu>
</contextMenu>
</TableColumn>
<TableColumn fx:id="lastNameColumn" prefWidth="100" text="Last Name">
<cellValueFactory>
<PropertyValueFactory property="lastName" />
</cellValueFactory>
</TableColumn>
<TableColumn fx:id="testColumn" prefWidth="300" text="Email Address">
<cellValueFactory>
<PropertyValueFactory property="test" />
</cellValueFactory>
</TableColumn>
</columns>
<items>
<FXCollections fx:factory="observableArrayList">
<!--/* <Person email="jacob.smith#example.com" firstName="Jacob" lastName="Smith" />
<Person email="isabella.johnson#example.com" firstName="Isabella" lastName="Johnson" />
<Person email="ethan.williams#example.com" firstName="Ethan" lastName="Williams" />
<Person email="emma.jones#example.com" firstName="Emma" lastName="Jones" />
<Person email="michael.brown#example.com" firstName="Michael" lastName="Brown" />/*-->
</FXCollections>
</items>
<columnResizePolicy>
<TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
</columnResizePolicy>
</TableView>
</children>
<columnConstraints>
<ColumnConstraints />
</columnConstraints>
<rowConstraints>
<RowConstraints />
<RowConstraints />
<RowConstraints />
<RowConstraints />
</rowConstraints>
</GridPane>

Answer 1

You have null condition to show your context menu. Add data to your tableView and click on row. (I think your ResultSet is empty)
tableView.setItems(data);