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POupdateItem's second param have never be false in javafx2
 

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    <p>I use javafx2 control TableView to dispay records in the database(I have 20 records now). And when display the record,I want to add button in each row. so I search lots of article use google,and write some code below.</p> <p>the key code is:</p> <pre><code> protected void updateItem(Long item, boolean empty) { super.updateItem(item, empty); if(empty) { setText(null); setGraphic(null); } else { final Button button = new Button("modifty"); setGraphic(button); setContentDisplay(ContentDisplay.GRAPHIC_ONLY); } } </code></pre> <p>I debug this code,the param "empty" would never be "false", so the button would never be display in the table view,</p> <p>can anyone help me? thanks</p> <p>below is the complete code(java and fxml):</p> <p>java:</p> <pre><code> package com.turbooo.restaurant.interfaces.javafx; import java.io.IOException; import java.net.URL; import java.text.SimpleDateFormat; import java.util.List; import java.util.ResourceBundle; import javafx.beans.property.SimpleStringProperty; import javafx.beans.value.ObservableValue; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.event.ActionEvent; import javafx.fxml.FXML; import javafx.fxml.FXMLLoader; import javafx.fxml.Initializable; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.control.ContentDisplay; import javafx.scene.control.TableCell; import javafx.scene.control.TableColumn; import javafx.scene.control.TableView; import javafx.scene.control.cell.PropertyValueFactory; import javafx.stage.Modality; import javafx.stage.Stage; import javafx.util.Callback; import com.turbooo.restaurant.domain.Customer; import com.turbooo.restaurant.domain.CustomerRepository; import com.turbooo.restaurant.interfaces.facade.dto.CustomerDto; import com.turbooo.restaurant.interfaces.facade.dto.assembler.CustomerDtoAssembler; import com.turbooo.restaurant.util.ContextHolder; import com.turbooo.restaurant.util.UTF8Control; public class CustomerController implements Initializable { @FXML private TableView&lt;CustomerDto&gt; customerTableView; @Override public void initialize(URL arg0, ResourceBundle arg1) { TableColumn&lt;CustomerDto, Long&gt; idCol = new TableColumn&lt;CustomerDto, Long&gt;("id"); idCol.setCellValueFactory( new PropertyValueFactory&lt;CustomerDto,Long&gt;("id") ); TableColumn&lt;CustomerDto, String&gt; nameCol = new TableColumn&lt;CustomerDto, String&gt;("name"); nameCol.setMinWidth(100); nameCol.setCellValueFactory( new PropertyValueFactory&lt;CustomerDto,String&gt;("name") ); TableColumn&lt;CustomerDto, String&gt; birthdayCol = new TableColumn&lt;CustomerDto, String&gt;("birthday"); birthdayCol.setCellValueFactory( new Callback&lt;TableColumn.CellDataFeatures&lt;CustomerDto, String&gt;, ObservableValue&lt;String&gt;&gt;() { @Override public ObservableValue&lt;String&gt; call(TableColumn.CellDataFeatures&lt;CustomerDto, String&gt; customer) { if (customer.getValue() != null) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); return new SimpleStringProperty(sdf.format(customer.getValue().getBirthday())); } else { return new SimpleStringProperty(""); } } }); TableColumn&lt;CustomerDto, Long&gt; actionCol = new TableColumn&lt;CustomerDto, Long&gt;("action"); actionCol.setCellFactory( new Callback&lt;TableColumn&lt;CustomerDto,Long&gt;, TableCell&lt;CustomerDto,Long&gt;&gt;() { @Override public TableCell&lt;CustomerDto, Long&gt; call(TableColumn&lt;CustomerDto, Long&gt; arg0) { final TableCell&lt;CustomerDto, Long&gt; cell = new TableCell&lt;CustomerDto, Long&gt;() { @Override protected void updateItem(Long item, boolean empty) { super.updateItem(item, empty); if(empty) { setText(null); setGraphic(null); } else { final Button button = new Button("modifty"); setGraphic(button); setContentDisplay(ContentDisplay.GRAPHIC_ONLY); } } }; return cell; } }); //TODO add button column customerTableView.getColumns().addAll(idCol, nameCol, birthdayCol, actionCol); loadData(); } public void loadData() { CustomerRepository cusRepo = (CustomerRepository)ContextHolder.getContext().getBean("customerRepository"); List&lt;Customer&gt; customers = cusRepo.findAll(); CustomerDtoAssembler customerDTOAssembler = new CustomerDtoAssembler(); List&lt;CustomerDto&gt; customerDtos = customerDTOAssembler.toDTOList(customers); ObservableList&lt;CustomerDto&gt; data = FXCollections.observableArrayList(customerDtos); customerTableView.setItems(data); } public void showNewDialog(ActionEvent event) { ResourceBundle resourceBundle = ResourceBundle.getBundle( "com/turbooo/restaurant/interfaces/javafx/customer_holder", new UTF8Control()); Parent container = null; try { container = FXMLLoader.load( getClass().getResource("customer_holder.fxml"), resourceBundle); } catch (IOException e) { e.printStackTrace(); } container.setUserData(this); //pass the controller, so can access LoadData function in other place later Scene scene = new Scene(container, 400, 300); Stage stage = new Stage(); stage.setScene(scene); stage.initModality(Modality.APPLICATION_MODAL); stage.show(); } } </code></pre> <p>fxml:</p> <pre><code> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;?import java.lang.*?&gt; &lt;?import java.util.*?&gt; &lt;?import javafx.scene.control.*?&gt; &lt;?import javafx.scene.layout.*?&gt; &lt;?import javafx.scene.paint.*?&gt; &lt;BorderPane prefHeight="345.0" prefWidth="350.0" xmlns:fx="http://javafx.com/fxml" fx:controller="com.turbooo.restaurant.interfaces.javafx.CustomerController"&gt; &lt;center&gt; &lt;TableView fx:id="customerTableView" prefHeight="200.0" prefWidth="200.0" /&gt; &lt;/center&gt; &lt;top&gt; &lt;HBox alignment="CENTER_LEFT" prefHeight="42.0" prefWidth="350.0"&gt; &lt;children&gt; &lt;Button text="new" onAction="#showNewDialog"/&gt; &lt;Separator prefHeight="25.0" prefWidth="13.0" visible="false" /&gt; &lt;Button text="modify" /&gt; &lt;Separator prefHeight="25.0" prefWidth="15.0" visible="false" /&gt; &lt;Button text="delete" /&gt; &lt;/children&gt; &lt;/HBox&gt; &lt;/top&gt; &lt;/BorderPane&gt; </code></pre>
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