我正在尝试使用 Ajax 和 JSF 2.0/primeface 创建一个简单的下拉框。基于 First Dropdown 选择，第二个下拉框使用 AJAX 调用填充。
当我选择第一个下拉列表时，它会根据 Ajax 调用正确填充第二个下拉框。但是当我在第二个下拉列表中进行选择并单击按钮{基本上提交表单以进行某些操作}时，它会给出错误消息“formViewBusinessCode：selectedBusinessCode：验证错误：值无效”
当我签入控制台时，“selectedBusinessCode”{Id of second dropdown} 的值为空。我很困惑，因为它正确填充但只有在选择后它才会给出错误值无效（基本上为空），为什么选择的值没有到达 bean？有人可以指出我在这里缺少的东西吗，TIA
xhtml代码如下
<h:outputText styleClass="outputText" value="#{constant.businessCodeGroup}"></h:outputText>
<h:selectOneMenu id="selectedBusinessCodeGroup" value="#{viewBusinessCodeBean.selectedBusinessCodeGroup}" >
<f:selectItem itemValue="SELCT" itemLabel="Select Business Code Group" />
<f:selectItems value="#{viewBusinessCodeBean.businessCodeGroupList}" />
<p:ajax listener="#{viewBusinessCodeBean.getOnlyBusinessCodeListByAjaxCall}" event="change" update="selectedBusinessCode" process="@this"/>
</h:selectOneMenu>
<h:outputText styleClass="outputText" value="#{constant.businessCode}"></h:outputText>
<h:selectOneMenu id="selectedBusinessCode" value="#{viewBusinessCodeBean.selectedBusinessCode}">
<f:selectItem itemValue="SELCT" itemLabel="Select Business Code" />
<f:selectItems value="#{viewBusinessCodeBean.businessCodeList}" itemLable="#{viewBusinessCodeBean.businessCodeList.getlable}"
itemValue="#{viewBusinessCodeBean.businessCodeList.getValue}" />
</h:selectOneMenu>
<h:commandButton value="View" action="#{viewBusinessCodeBean.getOnlyBusinessCodeDescription}"></h:commandButton>
bean编码如下。它是一个@ManagedBean
填充第一个下拉框
public ViewBusinessCodeBean() {
logger.entering(CLASS_NAME);
this.businessCodeGroupList = new ArrayList<SelectItem>();
List<String>tempBusinessCodeList = new BusinessCodeTableServices().getBusinessCodeGroupList();
Iterator<String>iterator = tempBusinessCodeList.iterator();
while(iterator.hasNext()){
String businessCodeGroup = iterator.next();
logger.debug(businessCodeGroup);
SelectItem item = new SelectItem(businessCodeGroup);
businessCodeGroupList.add(item);
}
logger.exiting(CLASS_NAME);
}
填充第二个下拉列表的 Ajax 调用方法
public void getOnlyBusinessCodeListByAjaxCall() {
this.businessCodeList = new ArrayList<SelectItem>();
List<String>tempBusinessCodeList = new BusinessCodeTableServices().getOnlyBusinessCodeList(getSelectedBusinessCodeGroup());
Iterator<String>iterator = tempBusinessCodeList.iterator();
while(iterator.hasNext()){
String businessCode = iterator.next();
SelectItem item = new SelectItem(businessCode,businessCode,businessCode);
businessCodeList.add(item);
}
}