如何在onbeforeunload上执行ajax函数？ [英] How to execute ajax function onbeforeunload?

问题描述

我正在开发一个php / javascript聊天。

I'm developing a php/javascript chat.

当用户登录时，他/她的用户名被插入名为队列。
此插入返回 mysql_insert_id（），它将存储在名为 $ _ SESSION ['CHAT_QUEUE_ID']

When the user logs in, his/her username is inserted in a MySQL table called queue. This insert returns the mysql_insert_id() that will be stored in a session variable called $_SESSION['CHAT_QUEUE_ID']

我需要在用户关闭页面时删除MySQL表格行。

I need the MySQL table row to be deleted when the user closes the page.

I尝试了以下，但没有成功：

I tried the following, but without success:

js file

window.onbeforeunload = closeSession;
function closeSession(){
    $.ajax({
        url: "/chat/process/chat.php",
        type: "GET"
    });
    return "disconnected";
}

chat.php

$delete= "DELETE FROM queue WHERE id = " . $_SESSION['CHAT_QUEUE_ID'];
// query, etc

有没有办法做到这一点？

Is there any way to do this?

推荐答案

你激活你的ajax异步（jquery - ajax的默认值）。但浏览器不会等待卸载任何内容。

You fire your ajax async (default for jquery - ajax). But the browser won't wait for anything on unload.

尝试在ajax-settings中设置 async：false 。但是你永远无法确定每次都能在所有浏览器中使用它。

try setting async : false in the ajax-settings. But you can never be sure that this will work in all browsers everytime.

在这里看到评论：
http://api.jquery.com/unload/#dsq-comment-body-132164390

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