可重複使用的JSF 2包括問題

我正在研究基於JSF 2.0中的ajax請求的狀態城市下拉菜單。問題是我想重用這個jsf模塊（beans和xhtmls）以供將來實現。可重複使用的JSF 2包括問題

是否有任何解決方案可以使parentBean更容易從另一個文件中實現的下拉列表中檢索id？

它出現在我腦海中的第一個解決方案是使用ui：include，但是我在存儲最終選定選項的變量中遇到空值。

以下是摘錄。的基本結構是：

StateCityBean（Ajax的菜單控制器）
stateCityBean.xhtml（Ajax的菜單）
ParentBean（selectedCity變量這裏使用）
parentBean.xhtml（UI：包括至stateCityBean .xhtml是這裏）

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" 
} 

}

來源

2017-08-21 Max Benin

我會推薦另一種方法，你應該創建一個自定義組件和一個託管bean來管理，然後將其注入到你的願望MB中。 –

@JorgeCampos但我這樣做就是這樣。 stateCityBean和stateCityBean.xhtml是「組件」，你不覺得嗎？或者你的意思是一個JSF組件？ –

差不多。 JSF複合組件。這裏有一個例子：https://www.tutorialspoint.com/jsf/jsf_composite_components.htm –

確定。我解決了這個問題。

顯然是在S

在stateCity.xhtml我刪除：

<t:subform id="stateCitySelectMenu">

就是這樣。

來源

2017-08-23 14:46:54

可重複使用的JSF 2包括問題

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