将操作方法​​名称作为参数传递给Facelets组件网络 [英] Passing action method names as arguments to facelets componenets

问题描述

我正在调用模板并传递如下参数:

I am calling a template and am passing in parameters like below:

<ui:include src="WEB-INF/Subviews/ProductEdit.xhtml">
    <ui:param name="items" value="#{produtList}"></ui:param>
    <ui:param name="itemToEdit" value="#{productToEdit}"></ui:param>
</ui:include>

在ProductEdit.xhtml中，我有类似

and in the ProductEdit.xhtml, I have something like

<ui:repeat value="#{items}" var="item">
  <tr>
    ...
    ...
    <td style="text-align: center">
      <h:commandLink style="cssGenericColumn" action="#{productEditAction}">
         <f:setPropertyActionListener target="#{itemToEdit}" value="#{item}"/>
      </h:commandLink>    
    </td>
  <tr>
</ui:repeat>

效果很好.

我现在想在ProductEdit.xhtml中对#{productEditAction}进行参数化，所以我做了以下

I now want to parameterize the #{productEditAction} in the ProductEdit.xhtml and so I did the following

<ui:include src="WEB-INF/Subviews/ProductEdit.xhtml">
    <ui:param name="items" value="#{produtList}"></ui:param>
    <ui:param name="itemToEdit" value="#{productToEdit}"></ui:param>
    <ui:param name="itemEditAction" value="#{productEditAction}"></ui:param>
</ui:include>

在第一页中，然后在ProductEdit.xhtml中，我

in the first page and then in ProductEdit.xhtml I do

<ui:repeat value="#{items}" var="item">
  <tr>
    ...
    ...
    <td style="text-align: center">
      <h:commandLink style="cssGenericColumn" action="#{itemEditAction}">
         <f:setPropertyActionListener target="#{itemToEdit}" value="#{item}"/>
      </h:commandLink>    
    </td>
  <tr>
</ui:repeat>

并且由于以下错误而失败

and this fails on the following error

javax.faces.el.EvaluationException: /WEB-INF/Subviews/ProductEdit.xhtml @45,89 action="#{itemEditAction}": Identity 'itemEditAction' does not reference a MethodExpression instance, returned type: java.lang.String
at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:    at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:    at javax.faces.component.UICommand.broadcast(UICommand.java:109)....
 ....
 ....
 ....

但是，如果操作绑定到模型对象，则此方法有效.像

This however works if the action bound to the model object. So something like

 <h:commandLink style="cssGenericColumn" action="#{item.editAction}">

有什么想法吗?

推荐答案

将方法作为参数传递应采用以下方式:

Passing a method as a parameter should be done in this way:

itemBean="#{bean}"
itemEditAction="productEditAction"

，然后在您的组件中将它们放到gheter中:

and in your component you will put them togheter:

action="#{itemBean[itemEditAction]}"

这篇关于将操作方法​​名称作为参数传递给Facelets组件网络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！