JSF 2 f：ui里面的param：重复 [英] JSF 2 f:param inside of ui:repeat

问题描述

如上所述，我需要为

as the question above mentiones, i need to create "dynamic" params for a

<ui:composition>
    <h:link>
        <h:outputText value="link with params" />
        <ui:repeat var="parameter" value="#{bean.getCurrentParameter}"> //customClass

            test: #{parameter.name} #{parameter.value} //output is fine

            <f:param name="#{parameter.name}" value="#{parameter.value}" />
        </ui:repeat>
    </h:link>
</ui:composition>

遗憾的是，test正确返回所有值，但是当我悬停链接时，没有单个参数集（page.xhtml而不是page.xhtml？param1 = ddd& param2 = sss ...）

unfortunately the "test" returns all values correctly, but when I hover the link, there is not a single parameter set ("page.xhtml" instead of "page.xhtml?param1=ddd&param2=sss...")

要解释为什么我需要这个，我想获取当前页面的所有参数并添加/删除一个（点击的链接是我要删除/添加的链接）。

To unterstand why I need this, I want to get all parameters of the current page and add/remove one (the link clicked on is the one I want to remove/add).

我需要为每个链接生成自己的参数（当param1 = 1,2时，默认情况下，一个链接有例如param1 = 1,2,3（附加3）而另一个有param1 = 1,2,4（附加4））

to I need to generate for each link its own parameters (when param1=1,2 by default, one link has e.g. "param1=1,2,3" (appends 3) and the other one has "param1=1,2,4" (appends 4))

推荐答案

Classic taghandlers与组件标签问题。 < ui：repeat /> 是在构建视图树之后运行的组件标记，而< f：param /> 是在视图构建期间放置在视图树中的标记处理程序。这意味着< f：param /> 在< ui：repeat /> 永远进入页面。因此，< f：param /> 需要时， var =parameter无法使用。

Classic taghandlers vs component tags issue. <ui:repeat/> is a component tag that runs after the view tree has been built while <f:param/> is a tag handler that is placed in the view tree during view build. What this means is that <f:param/> is parsed and processed before <ui:repeat/> ever makes it into the page. As a result var="parameter" is not available for use when <f:param/> needs it.

要修复此问题，请改用< c：forEach /> 代码：

To fix, use the <c:forEach/> tag instead:

<h:link>
   <h:outputText value="link with params" />
   <c:forEach var="parameter" items="#{bean.getCurrentParameter}">
       test: #{parameter.name} #{parameter.value}
        <f:param name="#{parameter.name}" value="#{parameter.value}" />
   </c:forEach>
</h:link>

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