JSF 2.0在commandLink和commandButton上导航不起作用 [英] JSF 2.0 navigating on commandLink and commandButton doesn't work

问题描述

我正在使用JSF 2.0，在commandLink和commandButton之后都无法导航.我使用以下代码:

I'm using JSF 2.0 and I have a problem with navigation after both commandLink and commandButton. I use following code:

<h:commandLink action="login?faces-redirect=true" 
    value="#{showElementBean.showElement()}"> Login </h:commandLink>  

<h:commandButton action="login?faces-redirect=true" value="Move to login.xhtml" />

这些标记位于表单内，登录仅是示例.单击呈现的控件的结果始终是POST，同时刷新当前页面.我怎么了?

These tags are inside a form, login is just an example. Result of clicking on rendered controls is always POST with refresh of a current page. What do I wrong?

修改: 根据BalusC的评论，我添加了真实的代码片段:

According to comments of BalusC I' adding real code fragment:

<h:commandLink actionListener="#{showElementBean.showElement(element)}" 
    value="View" > </h:commandLink>

我有一个包含元素列表的页面，并且我想添加指向元素视图页面的链接.因此，我需要将此元素传递给显示页面.我是JSF入门，例如在Rails中，我将使用GET和URL参数，但是我不知道如何在JSF中使用它.

I have a page with a list of elements and I want to add links that leads to element view page. Thus I need to pass this element to a show page. I'm JSF primer, e.g. in Rails I'd use GET and URL params, but I don't know how to do it 'in JSF-way'.

推荐答案

此行为有很多可能的原因.在以下答案中均引用了它们，并给出了解决方案: commandButton/commandLink/ajax action/未调用侦听器方法或输入值未更新.

There are a lot of possible causes for this behaviour. They are all cited in the following answer, along with solutions: commandButton/commandLink/ajax action/listener method not invoked or input value not updated.

但是，在您的特定情况下，您似乎宁愿对普通的GET请求而不是POST请求感兴趣，因为您想要的只是简单的页面到页面导航.在这种情况下，您需要使用<h:link>或<h:button>:

However, in your particular case, you seem rather to be interested in plain GET requests instead of POST requests, as all you want is simple page-to-page navigation. In that case, you need a <h:link> or <h:button> instead:

<h:link outcome="login" value="Login" />

<h:button outcome="login" value="Move to login.xhtml" />

(我不知道您要使用两者 #{showElementBean.showElement()}和Login作为命令链接值做什么，所以我省略了前者)

(I have no idea what you're trying to do with both #{showElementBean.showElement()} and Login as command link value, so I omitted the former)

• 何时应使用h:outputLink代替h:commandLink?

这篇关于JSF 2.0在commandLink和commandButton上导航不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！