FacesException:启用选择后，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
我试图学习PF，所以我首先显示数据表，然后在rowClick传递参数的页面上导航到下一页，但由于出现以下错误而陷入困境.对于该问题，我发现了类似的问题，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.
我遇到以下错误:
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.
我的页面:
<?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>
我的豆类:
@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;
}
}
OtherBean:
OtherBean:
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
如果未在<p:dataTable>上指定rowKey属性，则#{tableBean.cars}必须实现SelectableDataModel.
The #{tableBean.cars} must implement SelectableDataModel if you don't specify the rowKey attribute on the <p:dataTable>.
但是，您已经在#{tableBean}上实现了它.这个不对.您可以在 PrimeFaces展示柜中找到正确的示例.基本上，根据展示代码示例，您的TableBean类必须看起来像这样:
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的外观(再次从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}代替#{tableBean.cars}作为<p:dataTable>的值.完全与展示示例相同.
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只在<p:dataTable>上指定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并且在所有行中始终是唯一的即可.另请参见 DataModel何时必须实现org.primefaces.model.SelectableDataModel选择已启用，但是我已经定义了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:启用选择后，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！
