JSF 2:不显示Ajax错误 [英] JSF 2 : Ajax errors not displayed

问题描述

我目前正在尝试Ajax功能，并且对如何显示执行Ajax时出现的错误消息感到好奇? 例如，我有一个primefaces按钮:

Im currently trying out the ajax feature, and im curious about how can i display the error messages occured when i do the ajax stuff ? For example, i have a primefaces button :

<p:commandButton value="Refresh" update="debugPanel messages" 
   action="#{checkbocLabBean.submit}"/>

在测试该按钮时，似乎什么也没有发生，直到我检查服务器日志，才有例外.原来，我有错字.应该是#{checkboxLabBean.submit}.

When testing that button, nothing seems to happen, until i check the server logs, there's an exception. It turns out that i have a typo. Should be #{checkboxLabBean.submit}.

我现在唯一想到的就是禁用ajax，在我的情况下添加ajax ="false"，错误就会出现.

The only thing i can think of right now is to have disable the ajax, adding ajax="false" in my case, and the error will show up.

在使用ajax请求时，还有其他方法可以在开发阶段将错误显示在浏览器中吗?

Is there any other ways to show errors right into the browser in development phase when using ajax requests ?

推荐答案

Ajax请求是异步发生的.默认情况下，它们不会影响整个文档. PrimeFaces的ajax请求期间引发的异常将委派给 <p:ajaxStatus> .您可以在<facet name="error">中完成您的任务.

Ajax requests happens asynchronously. They do by default not affect the entire document. Exceptions thrown during PrimeFaces' ajax requests are delegated to <p:ajaxStatus>. You can do your thing in <facet name="error">.

<p:ajaxStatus>
    <f:facet name="start">Loading...</f:facet>
    <f:facet name="success"><h:outputText value="" /></f:facet>
    <f:facet name="error">An error has occurred!</f:facet>
</p:ajaxStatus>

如果您想用错误页面替换当前文档(这是一个非常合理的选择)，那么很高兴知道PrimeFaces在后台使用了jQuery，并且您可以按照以下方式配置jQuery:

If you rather want to replace the current document with the error page -which is a very reasonable choice- then it's good to know that PrimeFaces uses jQuery under the covers and that you can configure jQuery as follows to do so:

<script>
    jQuery.ajaxSetup({
        error: handleXhrError
    });

    function handleXhrError(xhr) {
        document.open();
        document.write(xhr.responseText);
        document.close();
    }
</script>

另请参见:

• 如何保护服务器上的Web应用程序侧错误?
• 服务器端的处理jQuery的ajax请求中的HTTP错误

See also:

• How to safeguard webapplication on server-side errors?
• Handling of server-side HTTP errors in jQuery's ajax requests

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