通常验证失败时 JSF 中的条件样式 [英] Conditional style in JSF when validation has failed in general

问题描述

我有 h:messages 来显示错误消息，并且有一个组件，我希望它的样式在发生验证错误时更改(如果任何组件有验证错误或呈现任何验证消息，则更改此样式特定组件).

i have h:messages to display error messages, and there's a component that i want its style to change in case of validation error occurs (if any component has a validation error or any validation message is rendered then change the style of this specific component).

如果组件有验证错误，我知道如何更改样式:JSF:检查 < 是否存在的更好方法;h:message for="id"/>

i know about the way to change the style if the component has validation errors: JSF : Better way to check for existence of <h:message for="id"/>

但我想要一种更通用的方法，如果表单中的任何组件无效，或者换句话说，任何验证消息都被呈现，则更改样式.

but i want a more general way, to change style if any component in the form is not valid, or in other words any validation message is rendered.

请告知如何实现.

推荐答案

您可以使用 FacesContext#isValidationFailed() 用于检查一般情况下验证是否失败.

You can use FacesContext#isValidationFailed() to check if validation has failed in general.

<h:outputText ... styleClass="#{facesContext.validationFailed ? 'fail' : 'success'}" />

或者，您可以使用 FacesContext#getMessageList() 检查是否有任何人脸消息.这不一定表示一般的验证失败，也可以是在 action 方法中添加的全局/成功消息.

Alternatively, you can use FacesContext#getMessageList() to check if there are any faces messages. This does not necessarily indicate a general validation failure, there can namely also be global/success messages which are been added in action method.

<h:outputText ... styleClass="#{not empty facesContext.messageList ? 'hasmessage' : 'nomessage'}" />

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