當我添加selectOneMenu（主要面孔）時，JSF頁面不起作用

Question

我有一個名爲Lecturer的託管bean。講師管理bean包含部門之間的關係。我想顯示存儲在數據庫中的所有部門。當我註冊講師時，我需要獲得其部門。

我的講師管理bean。我有適當的setter和getter方法。我只是爲了澄清而忽略它。

public class Lecturer 
{ 

    private String name; 
    private String surname; 

    private String email; 
    private String username; 
    private String password; 


    private List<Department> departments; 

    private LecturerService lecturerService; 
    private DepartmentService departmentService; 
} 

我Licturer.xhtml文件：

<h:form> 
<f:view> 
<p:panelGrid columns="2"> 

<f:facet name="header">Lecturer Registration Form</f:facet> 

<h:outputLabel for="name" value="Name :" /> 
<p:inputText id="name" value="#{Lecturer.name}" label="Name" required="true" /> 

<h:outputLabel for="surname" value="Surname :" /> 
<p:inputText id="surname" value="#{Lecturer.surname}" label="Surname" required="true" /> 

<h:outputLabel for="department" value="Department :" /> 


<p:selectOneMenu value="#{Lecturer.departments}" effect="fade" editable="true" var="p" > 
<f:selectItem itemLabel="Select One" itemValue="" /> 
<f:selectItems value="#{Lecturer.departments}" var="lec" 
itemLabel="#{lec.name}" itemValue="#{lec.name}"/> 
</p:selectOneMenu> 


<h:outputLabel for="email" value="Email :" /> 
<p:inputText id="email" value="#{Lecturer.email}" label="Email" required="true" /> 

<h:outputLabel for="username" value="User Name :" /> 
<p:inputText id="username" value="#{Lecturer.username}" label="Email" required="true" /> 

<h:outputLabel for="password" value="Password :" /> 
<p:inputText id="password" value="#{Lecturer.password}" label="Password" required="true" /> 

<f:facet name="footer"> 

<p:commandButton type="submit" 
       id="lecturer" 
       action="#{Lecturer.registerLecturer}" 
       value="Register" icon="ui-icon-disk"> 

       </p:commandButton> 

</f:facet> 

</p:panelGrid> 
</f:view> 
</h:form> 

我faces-config.xml中

<managed-bean> 
     <managed-bean-name>Lecturer</managed-bean-name> 
     <managed-bean-class>com.studinfo.controller.Lecturer</managed-bean-class> 
     <managed-bean-scope>session</managed-bean-scope> 

     <managed-property> 
      <property-name>departmentService</property-name> 
      <property-class>com.studinfo.services.DepartmentService</property-class> 
      <value>#{DepartmentService}</value> 
     </managed-property> 

     <managed-property> 
      <property-name>lecturerService</property-name> 
      <property-class>com.studinfo.services.LecturerService</property-class> 
      <value>#{LecturerService}</value> 
     </managed-property> 
    </managed-bean> 

當我刪除selectOneMenu用於標籤。我的頁面正常工作。

有關解決方案的任何想法？

我是否必須在字符串和Department類之間添加轉換器？

Answer 1

的p:selectOneMenu的value屬性應該保持參考到一個部門（這是選擇部門），而不是整個列表。你需要在你的bean添加一個字段這一點，如：

private Department selectedDepartment 
// getter and setter 

然後在你的facelet改變p:selectOneMenu的價值屬性和f:selectItems：

<p:selectOneMenu value="#{Lecturer.selectedDepartment}" effect="fade" 
       editable="true" var="p" > 
    <f:selectItem itemLabel="Select One" itemValue="" /> 
    <f:selectItems value="#{Lecturer.departments}" var="lec" 
       itemLabel="#{lec.name}" itemValue="#{lec}"/> 
</p:selectOneMenu> 

此外，您將需要一個轉換映射選定的字符串對象。