iframe在卸载事件之前 [英] iframe just before unload event

问题描述

我一直在努力完成像这样的事情

  $ iframe = $（'iframe'）; 
 $ iframe.beforeunload（function（）{
 debugger; 
}）; 
  

OR

  $ iframe = $（'iframe'）; 
 $ iframe.unload（function（）{
 debugger; 
}）; 
  

我甚至尝试将它绑定到iframe窗口本身，但没有任何运气

  $ iframe = $（'iframe'）; 
 $ iframe [0] .contentWindow.onunload = function（）{
 debugger; 
}; 
  

这些事件处理程序都不会触发我

，我很困惑为什么。重新加载iframe我从iframe外部使用 .reload（），也许我需要使用不同的方法？

解决方案

想通了！我不知道 contentWindow 在重新加载后会丢失它的引用。

  $ iframe.load（function（）{
 $ iframe [0] .contentWindow.onbeforeunload = function（）{
 debugger; 
}; 
}）; 
  

I need to capture an event which should be triggered just before the content of the iframe disappears.

I have been trying to accomplish something like this

$iframe = $('iframe');
$iframe.beforeunload(function () {
  debugger;
});

OR

$iframe = $('iframe');
$iframe.unload(function () {
  debugger;
});

I have even tried binding it to the iframe window itself without any luck

$iframe = $('iframe');
$iframe[0].contentWindow.onunload = function () {
  debugger;
};

None of these eventhandlers actually trigger for me

and I am quite confused why. To reload the iframe I use .reload() from outside the iframe and from within, maybe I need to use a different method?

解决方案

Figured it out! I didn't know the contentWindow looses its reference after a reload.

$iframe.load(function () {
  $iframe[0].contentWindow.onbeforeunload = function () {
    debugger;
  };
});

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