JSF将ui:param与复合组件结合起来 [英] JSF Combine ui:param with composite component

问题描述

您以前在这个论坛上救过我很多次，但现在我真的很困，现在不再在哪里搜索...

you have saved me many times ago with this forum, but now I am really stuck and don't now where to search any longer...

我总是收到以下错误消息(警告级别，但方法也未正确执行):

I always get the following error message (warning level, but method is also not executed correctly):

javax.el.PropertyNotFoundException: Target Unreachable, identifier 'editor' resolved to null: javax.faces.FacesException: #{cc.attrs.selectionListener}

我已将问题隔离为几行代码:

I have isolated the problem to a few lines of code:

这是我的主文件:

<c:forEach items="#{myBean.getEditors()}" var="currentEditor" >
    <ui:include src="#{currentEditor.getPanel()} >
        <ui:param name="editor" value="#{currentEditor} />
    </ui:include>
</c:forEach>

bean.getEditors()(会话作用域)现在仅返回一个列表，其中包含一个条目. 编辑器"是具有一些简单属性和两个侦听器方法的POJO.侦听器方法仅写入日志条目. (将来当然应该做更多的事情)

The bean.getEditors() (session scoped) just returns a list with one single entry at the moment. The 'editor' is a POJO with some simple attributes and two listener methods. The listener method does only write a log entry. (Should of course do more in future)

包含的文件如下:

<h:selectOneMenu value="#{editor.menuValue}>
    <f:selectItem itemValue="Value 1" />
    <f:selectItem itemValue="Value 2" />
    <a4j:ajax event="change" listener="#{editor.menutListener()}" />
</h:selectOneMenu>
<myComponent:treeComponent id="tree" selectionListener="#{editor.treeListener()} />

我创建的组件由一张richfaces树组成，单击节点时，将调用以下方法:

The component I created consists of a richfaces tree and when clicking on a node the following method is called:

<a4j:jsFunction name="performSelection" action="#{cc.attrs.selectionListener} />

我非常有信心构图本身还可以，因为我也在不同的地方使用它.当我从a4j:jsFunction中删除操作时，它也可以完美运行.

I am quite confident that the composition itself is ok because I use it also at different places. When I remove the action from the a4j:jsFunction it also works perfect.

对我来说，它闻起来有点像 JSF 1223错误

For me it smells a bit like the bug JSF 1223

该解决方法对我不起作用-可能是因为我在forEach中创建了参数.

The workaround does not work for me - probably because I create the param in the forEach.

我以前也遇到过类似的问题(ui:param +组件)，但是能够通过将完整路径作为属性而不是参数来解决它们.但这在这里不起作用，因为它被用在太多不同的地方.

I had similar problems (ui:param + component) before, but was able to solve them with giving the full path as attribute instead of a parameter. But this does not work here because it is used in too many different places.

请帮助，我不是唯一一个遇到此问题的人，但我只是没有找到其他与此相关的线程.

Please help, I cannot be the only one with this problem, but I simply do not find any other threads for this.

今天，我有了一个崭新的想法，甚至更加接近这个问题.您可能会忘记整个include/forEach的所有内容...

Today with a fresh mind I came even closer to the problem. You can forget the whole include/ forEach stuff...

<myComponent:treeComponent id="tree" selectionListener="#{myBean.getSingleEditor().treeListener()} />

可以，而

<ui:param name="editor" value="#{myBean.getSingleEditor()} />
<myComponent:treeComponent id="tree" selectionListener="#{editor.treeListener()} />

不起作用. 可以很好地执行JAVA代码，但是将错误写入日志，并且jsFunction的render和oncomplete方法不起作用. 我还尝试使用数据"而不是动作"进行测试.没有错误写入日志，但是甚至没有调用JAVA方法.

does not work. Well the JAVA code is performed, but the error is written to the log and the render and oncomplete method of the jsFunction do not work. I also tried to use "data" instead of "action" for testing. No error is written to log, but JAVA method is not even called.

推荐答案

经过几天的尝试和错误，我发现了一个对我有用的解决方案:

After many days of try&error I found a solution that is working for me:

我将侦听器方法分为JAVA类的一个参数和方法名(作为简单String)的一个参数

I splitted up the listener method to one parameter with the JAVA class and one parameter with the the method name (as simple String)

操作方法现在看起来像:

The action method now looks like:

<a4j:jsFunction name="performSelection" action="#{cc.attrs.listenerClass[cc.attrs.listenerMethodName]}" />

不好但是可以工作...也许对某人有帮助-或任何人都可以解释更多...

Not nice but working... Perhaps it helps someone - or anybody can explain more...

顺便说一句，以下内容对我不起作用:

By the way, the following was not working for me:

<a4j:jsFunction name="performSelection" action="#{cc.attrs.listenerClass[staticMethodName]}" />

虽然还可以...

<a4j:jsFunction name="performSelection" action="#{cc.attrs.listenerClass.staticMethodName()}" />

不知道-也许我的头一次又一次地在同一堵墙上奔跑...

Don't know - perhaps my head is running agains the same wall again and again...

这篇关于JSF将ui:param与复合组件结合起来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！