如何在删除iframe时触发onunload事件?

时间:2011-12-30 07:13:26

标签: iframe triggers removechild onunload

删除iframe时,如何触发iframe的卸载事件?

使用下面的代码,当调用removeChild(iframe)时,不会触发onunload事件。

<!-- parent.html -->
<html>
  <head>
    <title>remove iframe</title>
    <script type="text/javascript">
      window.onload = function() {
        var button = document.getElementsByTagName("BUTTON")[0];
        button.onclick = function() {
          document.body.removeChild(document.getElementsByTagName("IFRAME")[0]);
        };
      };
    </script>
  </head>
  <body>
    <iframe src="./son.html" />
    <button>Remove iframe</botton>
  </body>
</html>
<!-- son.html -->
<html>
  <head>
    <title>son html</title>
    <script type="text/javascript">
      window.onload = function() { alert("hello"); };
      window.onunload = function() { alert("world!"); };
    </script>
  </head>
  <body style="background-color:#aaccee;">
  </body>
</html>

我该如何触发它?

1 个答案:

答案 0 :(得分:9)

在删除框架之前,您可以将iframe元素的src属性设置为“about:blank”,检查这是否使iframe触发onunload事件。

EG:

var iframe = document.getElementsByTagName("IFRAME")[0];
iframe.src = "about:blank";
document.body.removeChild(iframe);