检测iframe何时获取或失去焦点 [英] Detecting when an iframe gets or loses focus

问题描述

检测iframe何时获取或失去焦点的正确方法（即是否将接收键盘事件）是什么？以下内容在Fx4中无效：

What's the correct way of detecting when an iframe gets or loses focus (i.e. will or will not receive keyboard events)? The following is not working in Fx4:

var iframe = /* my iframe */;
iframe.addEventListener("focus", function() { /* never gets called */ }, false);

推荐答案

原来这不是真的可能。我不得不改变我的页面的逻辑，以避免跟踪iframe的重点。

Turns out it's not really possible. I had to change the logic of my page to avoid the need of tracking if the iframe has focus.

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