Question

我正在开发一个页面来生成动态下拉菜单。如果我使用硬编码值，我可以在表单提交上获取所选值。但是如果我动态生成，那就不起作用了。任何人都可以帮我吗？

豆（工作）：

public String getApplication_environment() {
    return application_environment;
}

public void setApplication_environment(String application_environment) {
    this.application_environment = application_environment;
}

private List<SelectItem> application_environment_list = ENVIRONMENT_LIST;

public static final List<SelectItem> ENVIRONMENT_LIST = new ArrayList<SelectItem>() {
{
    add(new SelectItem("A"));
    add(new SelectItem("B"));
    add(new SelectItem("C"));
    add(new SelectItem("D"));
}
};

Bean（不工作）：

public static final List<SelectItem> ENVIRONMENT_LIST = new ArrayList<SelectItem>() {
{
    for(int i=0;i<3;i++){
        add(new SelectItem("--"+i));
    }
}
};

XHTML代码：

<f:view>
<div>
    <ui:include src="header.xhtml"></ui:include>
<h:body>
<h:form>
<rich:panel styleClass="panel-bgimage"
style="vertical-align:middle;">
<table>
<tr>
<td align="center"><h:outputText value="Tags"
    styleClass="headerOutputCell" /> <h:selectOneMenu
    value="#{ProjectTags.application_environment}" id="application_environment">
    <f:selectItems value="#{ProjectTags.application_environment_list}" var="coll" itemValue="#{coll.label}" itemLabel="#{coll.value}" />
    </h:selectOneMenu></td>
</tr>
 <tr height="30px">
 <td></td>
 </tr>
 <tr>
 <td align="center"><h:selectManyCheckbox
 value="#{ProjectTags.environments}" styleClass="headerOutputCell">
 <f:selectItems value="#{ProjectTags.environmentsValue}" />
 </h:selectManyCheckbox></td>
 </tr>
 <tr height="30px">
 <td></td>
 </tr>
 <tr>
 <td align="center"><h:commandLink id="hmPromote" onclick="dlgConfirmation.show();return false" styleClass="homebtn">
 <center class="buttonText">Promote</center>
 </h:commandLink> 
 </td>
 </tr>
 </table>
 <h:panelGrid id="panel" cellpadding="10"
 cellspacing="1" rendered = "#{ProjectTags.isNewTag}" >
 <table>
 <tr><td>
 <h:panelGrid columns="2" align="center">
 <h:outputText styleClass="headerOutputCell" value="New tag     " />
 <h:selectBooleanCheckbox value="#{ProjectTags.rememberMe}" > 
 <f:ajax event="click" execute="@form" />
 </h:selectBooleanCheckbox>
 </h:panelGrid>
 <h:panelGroup>
 <h:commandLink id="hmSubmit" onclick="modalDialogCreate.show();return false" styleClass="homebtn">
 <center class="buttonText">Submit</center>
 </h:commandLink>
 </h:panelGroup>
 </td></tr>
 </table>
 </h:panelGrid>
  </rich:panel>
 <p:confirmDialog id="confirmDialog"
 message="Are you sure to promote the tags?"
 header="Confirm Promote" severity="alert" widgetVar="promoteDialog">
 </p:confirmDialog>
 <p:dialog id="modalDialog" header="Please wait" widgetVar="dlgConfirmation" modal="true">
 <h:panelGrid columns="2">
 <h:graphicImage value="/images/icon-alert.png" />
 <h:outputText value="Are you sure to promote the tags?" style="FONT-SIZE: medium;" />
 </h:panelGrid>
 <h:panelGroup>
 <h:commandButton id="confirm" value="OK" onclick="dlgConfirmation.hide();promoteProcess.show()"
 action="#{ProjectTags.promoteTags}" immediate="true" style="padding:5px;"/>           
 <h:commandButton id="Logout" value="Cancel" oncomplete="dlgConfirmation.hide()" style="padding:5px;"/>
 </h:panelGroup>
 </p:dialog>
 <p:dialog id="modalDialogCreate" header="Please wait" widgetVar="modalDialogCreate" modal="true">
 <h:panelGrid columns="2">
 <h:graphicImage value="/images/icon-alert.png" />
 <h:outputText value="Are you sure to create new tag?" style="FONT-SIZE: medium;" />
 </h:panelGrid>
 <h:panelGroup>
 <h:commandButton id="c_confirm" value="OK" onclick="modalDialogCreate.hide();promoteProcess.show()"
 action="#{ProjectTags.createNewTag}" immediate="true" style="padding:5px;"/>           
 <h:commandButton id="c_cancel" value="Cancel" oncomplete="modalDialogCreate.hide()" style="padding:5px;"/>
 </h:panelGroup>
 </p:dialog>

 <p:dialog id="modalDialogProcess" header="Please wait" widgetVar="promoteProcess" modal="true">
 <h:panelGrid columns="2">
 <h:outputText value="Your Request is being processed"
 style="FONT-SIZE: large;" />
 <h:graphicImage value="./images/gears_animated.gif" />
 <h:outputText
 value="*Please do not click refresh till the request is in process"
 style="FONT-SIZE: smaller;" />
 <h:outputText id="elapsedTime" value="" style="FONT-SIZE: smaller;"></h:outputText>
 </h:panelGrid>
 </p:dialog>
 </h:form>
 </h:body>
 </div>
 </f:view>