调用验证程序，但不显示错误消息 [英] Validator is called but error message is not displayed

问题描述

当我单击命令按钮时.调用validate方法，但未显示错误消息.

when i click on the command button. validate method is getting called but the error message is not getting displayed..

这是我的代码.

<h:form id="form">
    <h:body>
        <p:panel style="width:500px">
            <h:outputLabel for="year" value="Select Year: *" style="font-weight:bold" />
            <p:selectOneMenu id="year" value="#{leaveBean.year}">
                <f:selectItem itemLabel="Select One" itemValue="null" />
                <f:selectItems value="#{leaveBean.yearDTO}" var="currentUser" itemValue="#{currentUser.name}" itemLabel="#{currentUser.name}" />
                <f:validator validatorId="LeaveCardValidator" />
            </p:selectOneMenu>
        </p:panel>

        <p:commandButton value="Submit" action="#{leaveController.leaveCard}" update="updateList,updateDetails" id="button"/>
       <h:message for="year" style="color:red"/>

推荐答案

您似乎希望JSF在每个ajax请求上自动更新<h:message>.这是不正确的.也许您对PrimeFaces <p:messages>或<p:growl>感到困惑，它们每个都有一个autoUpdate属性，使您可以告诉他们在每个ajax请求中自动更新.

You seem to expect that JSF auto-updates the <h:message> on every ajax request. This is untrue. Perhaps you're confusing with PrimeFaces <p:messages> or <p:growl> which have each an autoUpdate attribute which enables you to tell them to auto-update themselves on every ajax request.

您确实需要确保ajax更新覆盖了<h:message>.只需给它一个ID

You really need to make sure that the <h:message> is covered by the ajax update. Just give it an ID

<h:message id="yearMessage" ... />

并将其包含在ajax更新的客户端ID集合中

and include it in the client ID collection of the ajax update

<p:commandButton ... update="updateList updateDetails yearMessage" />

另一种选择是将<h:message>替换为<p:messages autoUpdate="true">.

An alternative would be to replace <h:message> by <p:messages autoUpdate="true">.

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