浏览器/选项卡使用javascript（或任何其他语言）关闭检测 [英] Browser/tab close detection using javascript (or any other language)

问题描述

我在不同的地方搜索过这个问题，但他们提到的只是使用javascript window.unload & window.onbeforeunload 。此外，它在大多数情况下都不能用于Chrome，因为它被阻止。

然后google如何设法做到这一点。如果我们正在撰写邮件并错误地关闭标签，谷歌会提示我们你确定吗？ BO $ b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b错误点击标签关闭。如果是的话，我允许他离开其他他留在页面&继续填写他的表格。

I searched for this question in various places, but all that they mention is the use of javascript window.unload & window.onbeforeunload. Also it doesn't work in chrome most of the times as it gets blocked.
Then how does google manage to do it. If we are composing a mail and by mistake close the tab, google prompts us by a "Are you sure?" box.
Can somebody help me out?
What actually I want to do is to ask confirmation of the user, when he is filling in the form and by mistake clicks on tab close. If yes, I allow him to navigate away else he stays on the page & continues to fill his form.

推荐答案

我测试过，在MDN上发布的示例在Chrome中清晰可见。

I tested and the example posted on MDN works clearly in Chrome.

<script>
    window.onbeforeunload = function (e) {
        e = e || window.event;

        // For IE and Firefox prior to version 4
        if (e) {
            e.returnValue = 'Any string';
        }

        // For Safari
        return 'Any string';
    };

    function formSubmit() {
      window.onbeforeunload = null; 
   }
</script>

...

   <form onsubmit="formSubmit()">...</form>

这样一个对话框打开，不会被弹出窗口阻止程序阻止，因为它来自用户点击。

This way a dialog opens that will not be blocked by a popup blocker as it is originated from a user click.

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