如何在不同的消息元素中显示相同输入字段的 ValidatorException 和 required="true"

我采取了以下BalusC 启动示例 https://stackoverflow.com/a/7493527/617373并通过添加提交按钮和附加 h:messages 并删除f:ajax来自h:inputSecret's（删除了f:ajax由于某种原因，当我第一次离开时h:inputSecret它立即显示第二个“需要值”错误h:inputSecret- 但用户没有机会输入......？？？

好吧，长话短说：

我试图弄清楚如何在全局 h:messages 中而不是在密码字段的单独 h:message 中显示有关两个密码字段（密码不相等）的验证错误 我确实希望 required="true" 将显示在<h:message每个领域的...

但现在验证消息（由我的异常引发）和 required="true" 显示在同一个地方

这是代码：

<h:outputLabel for="password" value="Password:" />
<h:inputSecret id="password" value="#{bean.password}" required="true">
    <f:validator validatorId="confirmPasswordValidator" />
    <f:attribute name="confirm" value="#{confirmPassword.submittedValue}" />
</h:inputSecret>
<h:message id="m_password" for="password" />

<h:outputLabel for="confirm" value="Password (again):" />
<h:inputSecret id="confirm" binding="#{confirmPassword}" required="true">
</h:inputSecret>
<h:message id="m_confirm" for="confirm" />

还有额外的h:commandButton with h:messages在该代码下面：

<h:commandButton value="doSomething" action="#{myBean.myAction}">
    <f:ajax execute="password confirm" render="m_password m_confirm"></f:ajax>
</h:commandButton>
<h:messages globalOnly="true" styleClass="validation_value_required"/>

@FacesValidator("confirmPasswordValidator")
public class ConfirmPasswordValidator implements Validator {

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        String password = (String) value;
        String confirm = (String) component.getAttributes().get("confirm");

        if (password == null || confirm == null) {
            return; // Just ignore and let required="true" do its job.
        }

        if (!password.equals(confirm)) {
            throw new ValidatorException(new FacesMessage("Passwords are not equal."));
        }
    }

}

Also

提前谢谢，

解决方案（感谢BalusC）

changed

<f:attribute name="confirm" value="#{confirmPassword.submittedValue}" />

to

<f:attribute name="confirm" value="#{confirmPassword}" />

and

String confirm = (String) component.getAttributes().get("confirm");

into

UIInput confirmPasswordComponent = (UIInput) component.getAttributes().get("confirm");
String confirm = (String) confirmPasswordComponent.getSubmittedValue();

and

throw new ValidatorException(new FacesMessage("Passwords are not equal."));

into

context.addMessage(null, new FacesMessage("Passwords are not equal."));
context.validationFailed();
((UIInput) component).setValid(false);
confirmPasswordComponent.setValid(false);
return;

If a Validator在特定组件上抛出ValidatorException，那么它的FacesMessage将自动与该组件关联Validator被调用。

您需要手动添加FacesMessage on a null客户端 ID，以便它最终出现在<h:messages globalOnly="true">。还需要手动设置validationFailed() on FacesContext这样 JSF 就不会更新模型值也不会调用该操作。如果有必要（尽管建议），您还需要手动将组件标记为无效，以便任何适当的侦听器/树访问者（例如用于突出显示）将考虑到这一点。

if (!password.equals(confirm)) {
    context.addMessage(null, new FacesMessage("Passwords are not equal."));
    context.validationFailed();
    ((UIInput) component).setValid(false);
    confirmPasswordComponent.setValid(false); // You'd need to pass it as component instead of as its submitted value in f:attribute.
}

顺便说一句，OmniFaces http://omnifaces.org项目有一个<o:validateEqual>组件应该可以使这个过程变得不那么乏味。也可以看看展示示例 http://showcase.omnifaces.org/validators/validateEqual.