可重用的 JSF 2 包含问题

Question

我正在基于 JSF 2.0 中的 ajax 请求开发 State-City 下拉列表。问题是我想在将来的实现中重用这个 jsf 模块(bean 和 xhtml(。

是否有任何解决方案可以使父Bean可以轻松地从另一个文件中实现的下拉列表中检索id？

我脑海中出现的第一个解决方案是使用 ui：include，但我在存储最终选定选项的变量上遇到了空值。

这是片段。基本结构为：

1. StateCityBean (Ajax Menu controller(
2. stateCityBean.xhtml (Ajax Menu(
3. ParentBean(此处使用选定的城市变量(
4. parentBean.xhtml (ui：include to stateCityBean.xhtml 在这里(

州城市豆

@ManagedBean(name = "stateCityBean")
@ViewScoped
public class StateCityBean implements Serializable {
private static final long serialVersionUID = 7344375121014662582L;
private static final Logger LOG = Logger.getLogger(MenuEstadoCidadeBean.class);
private Collection<SelectItem> stateList;
private Collection<SelectItem> stateCity;
private String selectedState; //not used yet, test purpose
private Integer selectedCity; //not used yet, test purpose
//All the code here is perfectly fine. Cities are loading based on the selected state in parentBean. 
}

州城豆.xhtml

<t:subform id="stateCitySelectMenu">
<span class="label tamanho20">STATE:</span> 
<span aria-live="polite">
<h:selectOneMenu class="tamanho10" id="stateList" name="stateList" value="#{bean.selectedState}" title="State">
<f:selectItems value="#{stateCityBean.stateList}" />
<f:ajax event="valueChange" render="CityList" listener="#{stateCityBean.searchCities(bean.selectedState)}" onevent="loadingGif"/>
</h:selectOneMenu>
</span> 
<span class="tamanho20">CITY:</span> 
<span aria-live="polite"> 
<h:selectOneMenu class="tamanho20" title="City" id="CityList" name="CityList" value="#{bean.selectedCity}">
<f:selectItems value="#{stateCityBean.cityList}" />
</h:selectOneMenu>
</span>
</t:subform>

父母豆.xhtml

<ui:include src="stateCityBean.xhtml">
<ui:param name="bean" value="#{parentBean}" />
</ui:include>

父母豆.java

@ManagedBean
@RequestScoped
public class parentBean implements Serializable {
private static final long serialVersionUID = -874412419784226660L;
private static final Logger LOG = Logger.getLogger(parentBean.class);
String selectedState;
Integer selectedCity;
public String getSelectedState() {
return selectedState;
}
public void setSelectedState(String selectedState) {
this.selectedState = selectedState;
}
public Integer getSelectedCity() {
return selectedCity;
}
public void setSelectedCity(Integer selectedCity) {
this.selectedCity= selectedCity;
}
public void doSomethingWithTheSelectedCityId(){
//bla bla bla
return "anotherPage"
}
}

Answer 1

好的。我解决了问题。

显然是

在州城.xhtml我删除了：

<t:subform id="stateCitySelectMenu">

仅此而已。