如何在JSF中显示应用程序的错误？ [英] How to display my application's errors in JSF?

问题描述

在我的JSF / Facelets应用程序中，以下是我表单部分的简化版本：

In my JSF/Facelets app, here's a simplified version of part of my form:

<h:form id="myform">
  <h:inputSecret value="#{createNewPassword.newPassword1}" id="newPassword1" />
  <h:message class="error" for="newPassword1" />
  <h:inputSecret value="#{createNewPassword.newPassword2}" id="newPassword2" />
  <h:message class="error" for="newPassword2" />
  <h:commandButton value="Continue" action="#{createNewPassword.continueButton}" />
</h:form>

我希望能够根据某些特定的h：message标签分配错误在continueButton（）方法中发生。需要为newPassword和newPassword2显示不同的错误。验证器将无法正常工作，因为将会传递结果（来自DB）的方法在continueButton（）方法中运行，并且运行两次太贵了。

I'd like to be able to assign an error to a specific h:message tag based on something happening in the continueButton() method. Different errors need to be displayed for newPassword and newPassword2. A validator won't really work, because the method that will deliver results (from the DB) is run in the continueButton() method, and is too expensive to run twice.

我无法使用h：messages标签，因为该页面有多个地方需要显示不同的错误消息。当我尝试这个，页面显示每个消息的重复。

I can't use the h:messages tag because the page has multiple places that I need to display different error messages. When I tried this, the page displayed duplicates of every message.

我尝试这是一个最好的猜测，但没有运气：

I tried this as a best guess, but no luck:

public Navigation continueButton() {
  ...
  expensiveMethod();
  if(...) {
    FacesContext.getCurrentInstance().addMessage("newPassword", new FacesMessage("Error: Your password is NOT strong enough."));
  }
}

我缺少什么？任何帮助将不胜感激！

What am I missing? Any help would be appreciated!

推荐答案

如果有人好奇，我能够根据您的所有回答组合！

In case anyone was curious, I was able to figure this out based on all of your responses combined!

这是在Facelet中：

This is in the Facelet:

<h:form id="myform">
  <h:inputSecret value="#{createNewPassword.newPassword1}" id="newPassword1" />
  <h:message class="error" for="newPassword1" id="newPassword1Error" />
  <h:inputSecret value="#{createNewPassword.newPassword2}" id="newPassword2" />
  <h:message class="error" for="newPassword2" id="newPassword2Error" />
  <h:commandButton value="Continue" action="#{createNewPassword.continueButton}" />
</h:form>

这是在continueButton（）方法中：

This is in the continueButton() method:

FacesContext.getCurrentInstance().addMessage("myForm:newPassword1", new FacesMessage(PASSWORDS_DONT_MATCH, PASSWORDS_DONT_MATCH));

它的工作原理！感谢您的帮助！

And it works! Thanks for the help!

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