Managed Bean as Facelet参数使复合组件无法解析 [英] Managed Bean as Facelet parameter lets composite component prevent resolving
问题描述
在给定的情况下，我想将Facelet与其他ManagedBeans配合使用，因此将action-bean作为参数给出:
In the given case, I want to use a facelet with different ManagedBeans, so the regarding action-bean is given as an parameter:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html
xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html" >
<h:body>
<ui:include src="ratings.xhtml" >
<ui:param name="createAction" value="#{myOneCreateAction}" />
<ui:param name="ratings" value="#{context.ratings}" />
</ui:include>
</h:body>
</html>
我将创建动作作为参数value="#{myOneCreateAction}".
I'm giving the create action as parameter value="#{myOneCreateAction}".
在facelet中，该组件也是在其他页面上多次使用的组件-因此，我尝试在复合组件中对其进行重构.
Within that facelet is a component also being used several times on other pages - so I try to refactor it in a composite component.
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:io="http://java.sun.com/jsf/composite/inoutComponents">
<ui:composition>
<rich:dataTable id="ratingTblId"
value="#{ratings}"
var="rating">
<rich:column>
<io:removeButton
id="removeButton"
actionMethod="#{createAction.removeRating}"
immediate="true"
render=":#{rich:clientId('ratingTblId')}" />
<h:commandButton
id="removeButton2"
actionListener="#{createAction.removeRating}"
immediate="true" >
<f:ajax render="ratingTblId" />
</h:commandButton>
</rich:column>
</rich:dataTable>
</ui:composition>
</html>
请参见，该方法如何作为actionMethod="#{createAction.removeRating}"给予组件.该组件本身如下所示:
See, how the method is given as actionMethod="#{createAction.removeRating}" to the component. This component itself looks like following:
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:cc="http://java.sun.com/jsf/composite">
<!-- INTERFACE -->
<cc:interface>
<cc:attribute
name="actionMethod"
targets="remove"
method-signature="void f(javax.faces.event.ActionEvent)"/>
<cc:attribute name="render" required="false" />
</cc:interface>
<!-- IMPLEMENTATION -->
<cc:implementation>
<h:commandButton
id="remove"
actionListener="#{cc.attrs.actionMethod}"
onclick="if (!confirm('Do you really?')) { return false; }">
<f:ajax execute="@this" render="#{cc.attrs.render}" />
</h:commandButton>
</cc:implementation>
</ui:composition>
最后但并非最不重要的是托管bean
and last but not least, the managed bean
Name("myOneCreateAction")
@Scope(ScopeType.CONVERSATION)
public class MyOneCreateAction {
...
public void removeRating(ActionEvent ev) {
// do something
}
...
}
令人惊讶的是，当removeButton2正确跳转到正确的函数时，复合组件版本返回
Surprisingly, while the removeButton2 correctly jumps into the right function, the composite components version returns a
javax.faces.event.AbortProcessingException: Target Unreachable,
identifier 'createAction' resolved to null
相反.我正在将Mojarra JSF 2.1.26与Seam 2.3.1.CR1一起使用.没有嵌套的复合组件.将复合组件参数替换为#{myOneCreateAction.removeRating}时，它的工作原理与预期的一样.
instead. Am using Mojarra JSF 2.1.26 with Seam 2.3.1.CR1. There are no nested composite components. When replacing the composite component parameter to #{myOneCreateAction.removeRating}, it works like expected.
以前有人看过吗?我是盲人吗?任何已知的解决方法...?预先感谢！
Has anybody seen this before? Am I blind? Any work-arounds known... ? Thanks in advance!
推荐答案
作为一种变通办法，我重新编写了该组件，以将动作bean和动作方法作为两个单独的参数来解决，如下所示
As a work-around I rewrote the component to give action bean and action method as two separate parameters resolving them as following
xhtml:
<io:removeButton
id="removeButton"
actionBean="#{createAction}"
actionMethod="removeRating"
immediate="true"
render=":#{rich:clientId('ratingTblId')}" />
复合成分:
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:cc="http://java.sun.com/jsf/composite">
<!-- INTERFACE -->
<cc:interface>
<cc:attribute name="actionBean" />
<cc:attribute name="actionMethod" />
<cc:attribute name="render" required="false" />
</cc:interface>
<!-- IMPLEMENTATION -->
<cc:implementation>
<h:commandButton
id="remove"
action="#{cc.attrs.actionBean[cc.attrs.actionMethod]}"
onclick="if (!confirm('Do you really?')) { return false; }">
<f:ajax execute="@this" render="#{cc.attrs.render}" />
</h:commandButton>
</cc:implementation>
</ui:composition>
还更改了操作方法签名以返回String而不是void.那看起来不再那么性感了，但是行得通. :-/
also changing the action methods signature to return String instead of void. That does not look that super sexy anymore, but works. :-/
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