我正在尝试执行Primefaces Showcase上可用的 DataTable 示例。所有功能都有效，但是当我选择一行时，所选行的值不会显示在我的<p:dialog>.
我已经检查了所有替代方案，但没有任何效果。有人可以帮助我吗？
我正在使用 Primefaces 3.3 和 glassfish 3.0.1。这是我的代码：
数据表复杂.xhtml
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui"
xmlns:f="http://java.sun.com/jsf/core">
<h:head>
</h:head>
<body>
<h:form id="form">
<p:dataTable var="car" value="#{tableBean.cars}" rowKey="#{car.model}" paginator="true" rows="10"
selection="#{tableBean.selectedCar}" selectionMode="single" id="carsTable">
<p:ajax event="rowSelect" update=":form:display" oncomplete="carDialog.show()" />
<f:facet name="header">
List of Cars
</f:facet>
<p:column headerText="Model" sortBy="#{car.model}" filterBy="#{car.model}" id="model">
#{car.model}
</p:column>
<p:column headerText="Year" sortBy="#{car.year}" filterBy="#{car.year}" id="year">
#{car.year}
</p:column>
<p:column headerText="Manufacturer" sortBy="#{car.manufacturer}" filterBy="#{car.manufacturer}" id="manufacturer">
#{car.manufacturer}
</p:column>
<p:column headerText="Color" sortBy="#{car.color}" filterBy="#{car.color}" id="color">
#{car.color}"
</p:column>
</p:dataTable>
<p:dialog header="Car Detail" widgetVar="carDialog" resizable="false"
width="200" showEffect="explode" hideEffect="explode">
<h:panelGrid id="display" columns="2" cellpadding="4">
<h:outputText value="Model:" />
<h:outputText value="#{tableBean.selectedCar.model}" id="model"/>
<h:outputText value="Year:" />
<h:outputText value="#{tableBean.selectedCar.year}" id="year"/>
<h:outputText value="Manufacturer:" />
<h:outputText value="#{tableBean.selectedCar.manufacturer}" id="manufacturer"/>
<h:outputText value="Color:" />
<h:outputText value="#{tableBean.selectedCar.color}" id="color"/>
</h:panelGrid>
</p:dialog>
</h:form>
</body>
</html>
TableBean.java
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import javax.enterprise.context.SessionScoped;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
@ViewScoped
@ManagedBean(name = "tableBean")
@SessionScoped
public class TableBean implements Serializable {
private final static String[] colors;
private final static String[] manufacturers;
static {
colors = new String[10];
colors[0] = "Black";
colors[1] = "White";
colors[2] = "Green";
colors[3] = "Red";
colors[4] = "Blue";
colors[5] = "Orange";
colors[6] = "Silver";
colors[7] = "Yellow";
colors[8] = "Brown";
colors[9] = "Maroon";
manufacturers = new String[10];
manufacturers[0] = "Mercedes";
manufacturers[1] = "BMW";
manufacturers[2] = "Volvo";
manufacturers[3] = "Audi";
manufacturers[4] = "Renault";
manufacturers[5] = "Opel";
manufacturers[6] = "Volkswagen";
manufacturers[7] = "Chrysler";
manufacturers[8] = "Ferrari";
manufacturers[9] = "Ford";
}
private List<Car> cars;
private Car selectedCar;
private Car[] selectedCars;
public TableBean() {
cars = new ArrayList<Car>();
populateRandomCars(cars, 50);
}
public Car getSelectedCar() {
return selectedCar;
}
public void setSelectedCar(Car selectedCar) {
this.selectedCar = selectedCar;
}
private void populateRandomCars(List<Car> list, int size) {
for(int i = 0 ; i < size ; i++)
list.add(new Car(getRandomModel(), getRandomYear(), getRandomManufacturer(), getRandomColor()));
}
private int getRandomYear() {
return (int) (Math.random() * 50 + 1960);
}
private String getRandomColor() {
return colors[(int) (Math.random() * 10)];
}
private String getRandomManufacturer() {
return manufacturers[(int) (Math.random() * 10)];
}
private String getRandomModel() {
return UUID.randomUUID().toString().substring(0, 8);
}
public List<Car> getCars() {
return cars;
}
}
汽车.java
import java.io.Serializable;
import javax.enterprise.context.SessionScoped;
import javax.faces.bean.ManagedBean;
@ManagedBean(name = "car")
@SessionScoped
public class Car implements Serializable {
private String model;
private int year;
private String manufacturer;
private String color;
private int price;
public Car(){
}
public Car(String model, int year, String manufacturer, String color) {
this.model = model;
this.year = year;
this.manufacturer = manufacturer;
this.color = color;
}
public Car(String model, int year, String manufacturer, String color, int price) {
this.model = model;
this.year = year;
this.manufacturer = manufacturer;
this.color = color;
this.price = price;
}
public String getModel() {
return model;
}
public void setModel(String model) {
this.model = model;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public String getManufacturer() {
return manufacturer;
}
public void setManufacturer(String manufacturer) {
this.manufacturer = manufacturer;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
@Override
public boolean equals(Object obj) {
if(obj == null)
return false;
if(!(obj instanceof Car))
return false;
Car compare = (Car) obj;
return compare.model.equals(this.model);
}
@Override
public int hashCode() {
int hash = 1;
return hash * 31 + model.hashCode();
}
@Override
public String toString() {
return "Car{" + "model=" + model + ", year=" + year + ", manufacturer=" + manufacturer + ", color=" + color + ", price=" + price + '}';
}
}
编辑：要解决这个问题，只需在 TableBean.java 上添加@ViewScoped。