Java + DOM：注册和使用修改监听器：教程？ [英] Java+DOM: Registering and using modification listeners: tutorials?

问题描述

请指出一些关于如何使用Java的DOM实现注册和使用修改监听器的教程或其他解释示例。

Please point me to some tutorials or other explaining examples about how to register and use modification listeners with Java's DOM implementation.

在web我只找到了Javascript或Flex示例。

On the web I find only Javascript or Flex examples.

我的目标是了解何时修改了 Node 。

My target is to get to know when a Node was modified.

我尝试了几种方法，没有任何作用。 Java的DOM不支持这个功能吗？

I tried out several approaches, nothing works. Could it be that Java's DOM doesn't support this feature?

推荐答案

获得！

Casting 是窍门！

我正在寻找 org.w3.dom的实现.events.EventTarget ，但似乎只有内部类实现它。所以它只是被手动（通过假设 EventTarget的Node instanceof / code>）。

I was looking for implementations of org.w3.dom.events.EventTarget, but it seems that only internal classes implement it. So it have just to be casted by hand (by just assuming that Node instanceof EventTarget).

org.w3c.dom.events.EventListener myModificationListener =
  new org.w3c.dom.events.EventListener() {

    @Override
    public void handleEvent(Event e) {
      if (e instanceof MutationEvent) {
        MutationEvent me = (MutationEvent) e;
        System.out.println("type: " + me.getType()
          + ", dest: " + me.getTarget());
      }
    }

  };

Node someDomNode = ...

// here the unusual casting magic happens
((EventTarget) node).addEventListener(
  "DOMSubtreeModified", // constant
  myModificationListener, true);

// modify the node here by appending a child
// -> listener gets invoked

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