仅在显示特定的h:message时显示JSF元素 [英] Display JSF element only if specific h:message is being displayed

问题描述

我有一个带有多个输入的h:form，每个输入都有自己的h:message，我正在寻找一种仅在特定条件下显示(使用render或分配一些styleClass)其他元素的方式正在显示h:message(在未显示h:message时隐藏).

I have a h:form with several inputs and each of them got its own h:message and I'm looking for a way to show (using render or assigning some styleClass) some other element only when specific h:message is being shown (and hide when that h:message is not being displayed).

这是一个代码段

<li>
    <h:panelGroup id="current_password_wrapper">
        <p:password value="#{myBean.myCurrPass}" id="current_password" required="true"
            styleClass="required_field" />
    </h:panelGroup>
    <h:message for="current_password"/>
</li>
<li>
    <h:panelGroup id="new_password_wrapper">
        <p:password value="#{myBean.myNewPass}" id="new_password" required="true"/>
    </h:panelGroup>
    <h:message for="new_password"/>
    <h:commandLink value="my value"/>
</li>

我想仅在显示<h:message for="new_password"/>时使h:commandLink可见

到目前为止，我什么都找不到...

So far I couldn't find anything...

推荐答案

如果您的环境支持EL 2.2，则可以检查

If your environment supports EL 2.2, then you could check if FacesContext#getMessageList() isn't empty for the particular client ID.

<p:password binding="#{new_password}" ... />
<h:commandLink ... rendered="#{not empty facesContext.getMessageList(new_password.clientId)}" />

如果由于验证错误而显示该消息，那么您也可以只检查

If the message is being shown as result of a validation error, then you could also just check the UIInput#isValid() state of the component associated with the message.

<p:password binding="#{new_password}" ... />
<h:commandLink ... rendered="#{not new_password.valid}" />

请注意，手动将表情消息添加到上下文不会将输入组件标记为无效.因此，应该使用抛出ValidatorException的真实Validator，或者必须以编程方式进行显式的input.setValid(false)调用.

Note that manually adding a faces message to the context won't mark the input component invalid. Therefor either a true Validator should be used which throws a ValidatorException, or an explicit input.setValid(false) call has to be done programmatically.

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