FacesException:启用选择时，DataModel 必须实现 org.primefaces.model.SelectableDataModel [英] FacesException: DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled
问题描述
我正在尝试学习 PF，所以我首先显示数据表，然后在 rowClick 传递参数时导航到下一页，但遇到以下错误.我发现了这个问题的类似问题，但还没有运气.我希望有人能帮助我.
I am trying to learn PF so I started with displaying datatable first and navigating to next page on rowClick passing parameters, but got stuck with the following error. I found similar problem for that question but no luck yet. I hope somebody will help me out.
我收到以下错误:
DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled.
Caused by:
javax.faces.FacesException - DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled.
我的主页:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Primefaces 3.1</title>
</h:head>
<h:body>
<h:form id="form">
<p:dataTable value="#{tableBean.cars}" var="var" rowkey="#{var.model}"
selection="#{tableBean.car}" selectionMode="single">
<p:column> <f:facet name="header">
<h:outputText styleClass="outputText" value="Model"></h:outputText>
</f:facet>
<h:outputText styleClass="outputText"
value="#{var.model}"></h:outputText>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText styleClass="outputText" value="Color"></h:outputText>
</f:facet>
<h:outputText styleClass="outputText"
value="#{var.randomColor}"></h:outputText>
</p:column></p:dataTable>
</h:form>
</h:body>
</html>
我的 bean 类:
@ManagedBean
@ViewScoped
public class TableBean extends ListDataModel<Car> implements SelectableDataModel<Car>{
private List<Car> cars;
private Car car;
public List<Car> getCars() {
cars = new ArrayList<Car>();
Car car1 = new Car();
car1.setModel("BMW");
car1.setRandomColor("Black");
cars.add(car1);
Car car2 = new Car();
car2.setModel("Audi");
car2.setRandomColor("White");
cars.add(car2);
return cars;
}
public String onRowSelect(){
System.out.println("Row Click!!!");
return "otherpage";//Does this nav works???if not how???
}
public Car getCar() {
return car;
}
@Override
public Car getRowData(String pArg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public Object getRowKey(Car pArg0) {
// TODO Auto-generated method stub
return null;
}
}
其他豆:
public class Car{
private String model;
private String randomColor;
public String getRandomColor() {
return randomColor;
}
public void setRandomColor(String pRandomColor) {
randomColor = pRandomColor;
}
public String getModel() {
return model;
}
public void setModel(String pModel) {
model = pModel;
}
}
推荐答案
#{tableBean.cars} 必须实现 SelectableDataModel 如果你没有指定
The #{tableBean.cars} must implement SelectableDataModel if you don't specify the rowKey attribute on the <p:dataTable>.
然而，您已经在 #{tableBean} 上实现了它.这个不对.您可以在 PrimeFaces 展示中找到正确的示例.基本上，根据展示代码示例，您的 TableBean 类必须如下所示:
You have however implemented it on the #{tableBean} instead. This is not right. You can find correct examples in the PrimeFaces showcase. Basically, your TableBean class must look like this according to the showcase code example:
@ManagedBean
@ViewScoped
public class TableBean implements Serializable {
private List<Car> cars;
private Car car;
private CarDataModel carsModel;
public TableBean() {
cars = new ArrayList<Car>();
// Populate cars here and thus NOT in the getter method!
carsModel = new CarDataModel(cars);
}
// ...
}
CarDataModel 看起来像这样(同样，刚刚从 PrimeFaces 展示代码示例中复制):
Where the CarDataModel look like this (again, just copied from PrimeFaces showcase code example):
public class CarDataModel extends ListDataModel<Car> implements SelectableDataModel<Car> {
public CarDataModel() {
}
public CarDataModel(List<Car> data) {
super(data);
}
@Override
public Car getRowData(String rowKey) {
List<Car> cars = (List<Car>) getWrappedData();
for(Car car : cars) {
if(car.getModel().equals(rowKey))
return car;
}
return null;
}
@Override
public Object getRowKey(Car car) {
return car.getModel();
}
}
最后使用 #{tableBean.carsModel} 而不是 #{tableBean.cars} 作为
Finally use #{tableBean.carsModel} instead of #{tableBean.cars} as value of <p:dataTable>. Exactly as in the showcase example.
<p:dataTable value="#{tableBean.carsModel}" var="car" ... />
另一种更简单的方法是在 rowKey 属性.
Another, easier, way is to just specify the rowKey attribute on the <p:dataTable>.
<p:dataTable value="#{tableBean.cars}" var="car" rowKey="#{car.model}" ... />
这样您就不需要整个 SelectableDataModel.您只需要确保它永远不会 null 并且在各行中始终是唯一的.另见 DataModel 必须实现 org.primefaces.model.SelectableDataModel 当选择已启用，但我已经定义了rowKey.
This way you don't need the whole SelectableDataModel. You only need to ensure that it's never null and always unique across the rows. See also DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled, but I have already defined rowKey.
这篇关于FacesException:启用选择时，DataModel 必须实现 org.primefaces.model.SelectableDataModel的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
