JSF传递参数并重定向到视图范围 [英] JSF Passing parameter and redirecting to view scope

问题描述

我正在尝试将参数传递给另一页.我有一个图像类别，该列表在会话范围内，在我的标题模板中为此类别中的每个类别都创建了一个链接.

I'm trying to pass a parameter to an other page. I have a category of images and that list is in a session scope, a link is created for each of this category in my header template.

我想重定向到新页面，并传递所选的类别.

I would like to redirect to a new page, and pass the selected category.

<h:dataTable id="categoryMenu" value="#{menuBean.listCategory}" var="category">
    <h:column>
        <h:link value="#{category.name}"
     outcome="/image/imageList.xhtml" >
        </h:link>
    </h:column>
</h:dataTable>

但是现在我希望与ImageListBean.java关联的页面imageList.xhtml获得选定的类别.

But now I would like that my page imageList.xhtml associated with a ImageListBean.java get the selected category.

我通过使用f:param请求GET参数尝试了很多事情，但是因为我的ImageListBean.java必须处于视图范围内，所以它不起作用.

I tried a lot of things by requesting GET parameters with f:param, but because my ImageListBean.java must be as view scoped it does not work.

推荐答案

您的ViewScoped bean应该没有问题.使用以下代码:

Your ViewScoped bean shouldn't be problem. With this code:

<h:link value="#{category.name}" outcome="/image/imageList.xhtml">
  <f:param name="categoryName" value="#{category.name}"/>
</h:link>

您应该可以使用以下方法在后备Bean中访问此参数:

you should be able to access this parameter in your backing bean with this:

FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("categoryName")

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