如何获取EL中当前组件的ID [英] How to get id of current component in EL

问题描述

我正在使用JSF和PrimeFaces，但是我需要获取组件ID的值.因为我要用不同的ID来动态地构建面板，所以要显示一个面板，我需要比较当前面板是否为当前面板，然后再显示它.

I'm working with JSF and PrimeFaces, but I need to get the value of the id of a component. Because I'm building dinamycally panels with diferent id, to show a the panel I need to compare if is the current panel, then show it.

例如，如果我有下一个面板

For example if I've the next panel

<p:outputPanel id="#{bean.getID}" autoUpdate="true"
   renderer=#{@this.id == bean.currentPanel}
>
</p:outputPanel>

还有

public class Bean(){
  private int numberPanels =0;
  private int currentPanel = 0;

  public int getID(){
     //...a process that return different ID
  }
  // getter's and setters

}

很显然，@this.id不起作用.那么，如何通过PrimeFaces获取JSF组件ID的值呢?

Obviously, @this.id doesn't work. So, how to get the value of ID of componente ne JSF with PrimeFaces?

推荐答案

EL范围中有一个隐式的#{component}对象，其结果为当前UI组件.有了这些信息，您将获得以下属性:

There is an implicit #{component} object in the EL scope that evaluates to the current UI component. Given this information, you'll get the following attribute:

rendered="#{component.id eq bean.currentPanel}"

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