JSF验证器方法导致重复的FacesMessage显示在p:messages中 [英] JSF validator method results in duplicate FacesMessage shown in p:messages

问题描述

我有两个PrimeFaces p:calendar组件，一个代表开始日期，另一个代表结束日期.

I have two PrimeFaces p:calendar components, one representing a begin and the other representing an end date.

我想在其中任何一个更改时立即运行一个验证器方法.

I want to run a validator method now whenever one of them changes.

以下是结束日期部分:

                <p:calendar id="end-date"
                            widgetVar="testEndDate"
                            value="#{testManager.endDate}"
                            mindate="#{testManager.minEndDate}"
                            maxdate="#{testManager.maxEndDate}"
                            validator="#{testManager.validateEndDate}">
                    <p:ajax event="dateSelect" update="begin-date msgs" global="false" />
                </p:calendar>

这是验证器方法代码:

@Override
public void validateEndDate(FacesContext context, UIComponent component, Object value)throws ValidatorException
{
    System.out.println(this.getClass().getSimpleName() + ".validateEndDate()!");

    Date beginDate = this.getBeginDate();
    Date endDate = (Date)value;

    if ( endDate != null && endDate.getTime() <= beginDate.getTime() )
    {
        System.out.println("End date less than or equal to begin date!");

        // this.setValidated( false );
        //
        // throw new ValidatorException( JsfUtil.getValidationErrorFacesMessage( "common.validator.validTo.message" ) );
        context.addMessage(null, JsfUtil.getValidationErrorFacesMessage("common.validator.validTo.message"));
    }

    List < FacesMessage > messages = context.getMessageList();

    if ( !messages.isEmpty() )
    {
        System.out.println("Faces messages list not empty! Size = " + messages.size());

        this.setValidated(false);

        throw new ValidatorException(messages);
    }

    this.setValidated(true);
}

这就是我要做的:

• 通过命令按钮显示对话框.
• 点击空白的结束日期日历输入，弹出日历.
• 单击22(与开始日期相同).

• Show the dialog via command button.
• Click into the empty end date calendar input, which pops up the calendar.
• Click on the 22 (same date as the begin date).

至少从控制台输出来看，代码基本上是有效的:

The code basically works, at least according to the console output:

INFO: DefaultValidatingBeginEndDateChecker.validateEndDate()!
INFO: End date less than or equal to begin date!
INFO: Faces messages list not empty! Size = 1

但是，这在用户界面上显示了相同的FacesMessage 两次:

However, this shows the same FacesMessage twice on the UI:

如您所见，输出与验证器方法所说的不符.

As you can see, the output doesn't match what the validator method is saying.

有人知道发生了什么/错误以及如何解决此问题? (还请注意注释过的代码显示了有效的解决方案，但是我需要知道为什么它不起作用，因为我还有另一个更复杂的验证器，该验证器具有1+ ifs，应该显示多个消息...). /p>

Does anyone know what's going on/wrong and how to fix this? (Also note the outcommented code showing the working solution, but I need to know why this isn't working, because I have another more complex validator which has 1+ ifs which is supposed to show more than one message...).

推荐答案

有效的方法是将面孔消息收集在自己的列表中:

What works is to collect the faces messages in an own list:

    List<FacesMessage> messages = new ArrayList<FacesMessage>();

    if ( endDate != null && endDate.getTime() <= beginDate.getTime() )
    {
        System.out.println( "End date less than or equal to begin date!" );

        // context.addMessage( null, JsfUtil.getValidationErrorFacesMessage( "common.validator.validTo.message" ) );
        messages.add( JsfUtil.getValidationErrorFacesMessage( "common.validator.validTo.message" ) );
    }

    // ... more ifs

    if ( !messages.isEmpty() )
    {
        System.out.println( "Faces messages list not empty! Size = " + messages.size() );

        this.setValidated( false );

        throw new ValidatorException( messages );
    }

    this.setValidated( true );

Doh.

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