可重用的JSF 2包含问题

Question

我正在基于JSF 2.0中的ajax请求进行State-City Dropdown。 问题是我想将此jsf模块（bean和xhtmls）重用于以后的实现。

有什么解决方案可以使parentBean轻松地从另一个文件中实现的下拉菜单中检索ID？

我想到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。

这是代码段。 基本结构是：

1. StateCityBean（Ajax菜单控制器）
2. stateCityBean.xhtml（Ajax菜单）
3. ParentBean（此处使用selectedCity变量）
4. parentBean.xhtml（ui：包括到stateCityBean.xhtml的位置在此处）

stateCityBean

@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. 

}

stateCityBean.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> 

parentBean.xhtml

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

parentBean.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。 我解决了问题。

显然是

在stateCity.xhtml我删除了：

<t:subform id="stateCitySelectMenu">

就是这样。