可重复使用的JSF 2包括问题

问题描述：

我正在研究基于JSF 2.0中的ajax请求的状态城市下拉菜单。问题是我想重用这个jsf模块（beans和xhtmls）以供将来实现。可重复使用的JSF 2包括问题

是否有任何解决方案可以使parentBean更容易从另一个文件中实现的下拉列表中检索id？

它出现在我脑海中的第一个解决方案是使用ui：include，但是我在存储最终选定选项的变量中遇到空值。

以下是摘录。的基本结构是：

StateCityBean（Ajax的菜单控制器）
stateCityBean.xhtml（Ajax的菜单）
ParentBean（selectedCity变量这里使用）
parentBean.xhtml（UI：包括至stateCityBean .xhtml是这里）

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" 
} 

}

我会推荐另一种方法，你应该创建一个自定义组件和一个托管bean来管理，然后将其注入到你的愿望MB中。 –

@JorgeCampos但我这样做就是这样。 stateCityBean和stateCityBean.xhtml是“组件”，你不觉得吗？或者你的意思是一个JSF组件？ –

差不多。 JSF复合组件。这里有一个例子：https://www.tutorialspoint.com/jsf/jsf_composite_components.htm –

答

确定。我解决了这个问题。

显然是在S

在stateCity.xhtml我删除：

<t:subform id="stateCitySelectMenu">

就是这样。

可重复使用的JSF 2包括问题

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