为什么我不能使用jQuery火从卸载事件处理Ajax请求？ [英] Why can't I use jQuery to fire an AJAX request from an unload event handler?

问题描述

我有以下的code，打算当用户关闭聊天窗口记录事件：

I have the following code, intended to log the event when a user closes a chat window:

$(window).unload( function() {
   test();
});

function test()
{
   alert("Hi");
   $.ajax({
      type: "POST",
      url: baseUrl + 'Index/test',
      data: "user_id=" + "Nisanth" + "& chat_id=" + 2,
      success: function(msg){
         alert(msg);
      }
   });
   alert('Success');
}

无论是你好和成功的消息警告罚款，但在AJAX回调警报不......我打算通过AJAX请求触发的操作也不会发生（我开发一个聊天应用程序，并打算登录的数据库中的条目，当用户关闭窗口）。

Both the "Hi" and "Success" messages alert fine but the alert in the AJAX callback doesn't... The operation I intend to trigger via the AJAX request is also not happening (I'm developing a chat application, and intend to log an entry in the database when the user closes the window).

推荐答案

由于阿贾克斯是异步的，页面被卸载之前，响应被正确发送，有效地终止连接。尝试设置异步：假; ，虽然这会耽误卸载页面收到后的反应，这不是很大的用户体验，如果你的服务器运行缓慢，直到

Because the ajax is asynchronous, the page is unloading before the response is properly sent, effectively terminating the connection. Try setting async:false;, although this will delay unloading the page until after the response is received, which isn't great for user experience if your server is running slow.

$(window).unload( function () { 
    test(); 
}); 
function test() 
{ 
    alert("Hi"); 
    $.ajax({ 
    async: false,
    type: "POST", 
    url: baseUrl + 'Index/test', 
    data: "user_id=" + "Nisanth" + "& chat_id=" + 2, 
    success: function(msg){ 
            alert(msg); 
        } 
    }); 
    alert('Success'); 
} 

这篇关于为什么我不能使用jQuery火从卸载事件处理Ajax请求？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！