facelets:将带有ui:param的bean名称传递给action属性 [英] facelets: passing bean name with ui:param to action attribute

问题描述

由于某些自定义组件的属性中需要一个bean名称(不是bean实例)，因此我需要在页面之间传递实际的bean名称.由于非定制组件也使用bean本身，因此我想避免使用其他ui:param(如此处所述

Due to some custom components which expect a bean name (NOT the bean instance) in their attributes I need to pass the actual bean name between pages. As the bean itself is also used by non-custom components, I would like to avoid using additional ui:param (like described here Passing action in <rich:modalPanel>) since it will essentially specify the same bean.

是否可以使用ui:param提供的bean名称来指定组件的动作?

Is it possible to specify component's action using bean name provided with ui:param?

基本上，我正在尝试实现以下目标:

Basically I am trying to achieve the following:

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
template="/template.xhtml">

   <ui:param name="beanName" value="sessionBean"/>
   ...

</ui:composition>

和template.xhtml是

and template.xhtml is

<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:a4j="http://richfaces.org/a4j"
template="/someothertemplate.xhtml">

  </ui:define name="somename">
    <h:form>
        <a4j:commandButton value="test" action="#{beanName.delete}"/>
    </h:form>
  </ui:define>
</ui:composition>

尽管删除方法已正确定义(已通过action="#{sessionBean.delete}"验证)，但上面的代码为我提供了

Although delete method is properly defined (verified with action="#{sessionBean.delete}") the above code gives me

javax.faces.FacesException:#{beanName.delete}:javax.el.MethodNotFoundException:/template.xhtml @ 201,89 action =#{beanName.delete}":找不到方法:sessionBean.delete()

javax.faces.FacesException: #{beanName.delete}: javax.el.MethodNotFoundException: /template.xhtml @201,89 action="#{beanName.delete}": Method not found: sessionBean.delete()

推荐答案

您应该能够通过其作用域引用Bean:

You should be able to reference the bean via its scope:

 <a4j:commandButton value="test"
      action="#{sessionScope[beanName].delete}"/>

这篇关于facelets:将带有ui:param的bean名称传递给action属性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！