selectOneMenu用於不顯示值

SimController：

private static List<SelectItem> userList; 

public List<SelectItem> getUserList(String Id) { 
    try { 
     userList = new ArrayList<SelectItem>(); 
     userList = PDAO.getUserList(Id); 
    } catch (ClassNotFoundException | SQLException e) { 
     e.printStackTrace(); 
    } 

    return userList; 
} 

public void setUserList(List<SelectItem> userlist){ 
    this.userlist = userlist; 
}

PDAO：

public static List<SelectItem> getUserList(String Id) throws ClassNotFoundException, SQLException { 
    String sqlCmdName = "sql_get_other_users"; 
    String sql = getSql(sqlCmdName); 
    sql = Util.prepareSqlExt(sql, new String[] { Id }); 
    return (List<SelectItem>) buildResultSet(new ConverterToUserList(), sqlCmdName, sql); 
} 


class ConverterToUserList implements ResultSetConverterInterface { 

public Object convertResultSet(ResultSet resultSet) throws SQLException { 
    List<SelectItem> userList = new ArrayList<SelectItem>(); 
    while (resultSet.next()) { 
     userList.add(new SelectItem(resultSet.getString(1))); 

    } 
    if (userList.isEmpty()) 
     return null; 
    return userList; 
} 
}

HTML：

<t:div styleClass="#{SimController.simTabName=='SIMULATION_USERS'?'tabPaneActive':'tabPane'}"> 
       <h:commandButton style="width: 120px !important;" id="TabId3" value="#{messages.tab_other_user}" action="#{SimController.goOtherUsers}" immediate="true" onclick="wait2();"> 
        <f:param name="id" value="#{pSimController.details.Id}" /> 
       </h:commandButton> 
      </t:div> 



<h:selectOneMenu styleClass="linkButtons" value="SimController.userListtry" onchange="document.getElementById('SimFormId:mdsTabId3').click();"> 
    <f:selectItem itemValue="" itemLabel="-" /> 
    <f:selectItems value="#{SimController.userList}" /> 
</h:selectOneMenu>

我得到的值當我打印出用戶列表時最新的可能的時候，也就是說，它們是過去之前的HTML是：

[[email protected], [email protected], [email protected], [email protected], [email protected]]

這對我來說看起來不錯，但我總是得到以下信息

org.apache.myfaces.shared.util.SelectItemsIterator hasNext 
WARNING: ValueExpression #{SimController.userList} of UISelectItems with component-path {Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /pages/pSim.xhtml][Class: org.apache.myfaces.custom.document.Document,Id: appId][Class: org.apache.myfaces.custom.document.DocumentBody,Id: appBodyId][Class: javax.faces.component.html.HtmlPanelGrid,Id: j_id_t][Class: javax.faces.component.html.HtmlPanelGroup,Id: j_id_1u][Class: javax.faces.component.html.HtmlPanelGrid,Id: j_id_1v][Class: javax.faces.component.html.HtmlPanelGroup,Id: j_id_1z][Class: javax.faces.component.html.HtmlPanelGrid,Id: j_id_20][Class: javax.faces.component.html.HtmlSelectOneMenu,Id: j_id_28][Class: javax.faces.component.UISelectItems,Id: j_id_2a]} does not reference an Object of type SelectItem, array, Iterable or Map, but of type: null 

org.apache.myfaces.shared.renderkit.html.HtmlGridRendererBase renderChildren 
WARNING: PanelGrid {Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /pages/pSim.xhtml][Class: org.apache.myfaces.custom.document.Document,Id: appId][Class: org.apache.myfaces.custom.document.DocumentBody,Id: appBodyId][Class: javax.faces.component.html.HtmlPanelGrid,Id: j_id_t][Class: javax.faces.component.html.HtmlPanelGroup,Id: j_id_1u][Class: javax.faces.component.html.HtmlPanelGrid,Id: j_id_1v][Class: javax.faces.component.html.HtmlPanelGroup,Id: j_id_1z][Class: javax.faces.component.html.HtmlPanelGrid,Id: j_id_20] Location: /pages/planung/inc/buttonStripBottomSimul.xhtml at line 3 and column 55} has not enough children. Child count should be a multiple of the columns attribute.

菜單是HTML頁面上顯示的卻是空。

任何想法，爲什麼這是這種情況？

感謝您的幫助。

海盜

來源

2017-08-16 Viking

您在哪裏打印清單？我沒有看到代碼。是因爲SimController對於userList沒有getter？ – vvtx

它說上面的SimController中的getUserList ...我錯過了什麼嗎？ – Viking

Getters不採取方法論據。你有一個'public List getUserList（String Id）'，但你應該有一個'public List getUserList（）'方法。 – BalusC

正如@balusc已經指出的那樣，嘗試<f:selectItems value="#{SimController.getUserList(id)}"從facelet裏，如果你可以訪問id，這是我的猜測是#{pSimController.details.Id}。

來源

2017-08-16 14:19:11 mrod

既然不能從評論關閉問題...這裏是信貸@BalusC

吸氣劑不採取方法的參數。你有一個公共列表getUserList（String Id），但你應該有一個公共List getUserList（）方法。 - BalusC 7分鐘前

感謝您的幫助

來源

2017-08-16 14:24:51 Viking

selectOneMenu用於不顯示值

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