如何在离开页面时处理jQuery ajax post错误

Is there a way to handle the error from an ajax request within JQuery such that when the user navigates away from the page, the resulting error is ignored?

是否有一种方法可以处理JQuery ajax请求的错误，以便当用户从页面导航时，结果的错误被忽略?

$(document).ready(function() {
 $.ajax( {
    url:'/server/url/',
    type: 'POST',
    data: {some..data},
    success:function(response) { do stuff with response },
    error: function(xhr, textStatus, errorThrown) {
           // Don't raise this alert if user has navigated away from the page
           alert('error');
    }
});

I'm curious if anybody knows of a clean way to handle this? I know you could create some logic in a $(window).bind("beforeunload", function(){}) method but I'd prefer if there was a way to handle the situation without doing this since Chrome appears to no longer support it. Is there for example a specific error that is returned in this case?

我很好奇是否有人知道一个干净的方法来处理这个问题?我知道你可以在$(窗口)中创建一些逻辑。bind(“beforeunload”，function(){})方法，但是我更希望有一种方法可以在不这样做的情况下处理，因为Chrome似乎不再支持它了。例如，在这种情况下会返回一个特定的错误吗?

Thanks.

谢谢。

3 个解决方案

#1

It looks like the answer to this is to examine the jqXHR.status. The XMLHttpRequest spec outlines these steps to set the status:

这个问题的答案似乎是检查jqXHR.status。XMLHttpRequest规范概述了设置状态的这些步骤:

The status attribute must return the result of running these steps:

状态属性必须返回运行这些步骤的结果:

If the state is UNSENT or OPENED, return 0 and terminate these steps.

如果未发送或打开状态，返回0并终止这些步骤。

If the error flag is set, return 0 and terminate these steps.

如果设置了错误标志，返回0并终止这些步骤。

Return the HTTP status code.¹

返回HTTP状态码

NOTE also: The error flag indicates some type of network error or request abortion. It is initially unset and is used during the DONE state.

注意:错误标志表明某些类型的网络错误或请求流产。它最初是未设置的，在完成状态中使用。

From what I understand therefore, this code check should fix the issue:

根据我的理解，这个代码检查应该解决这个问题:

    if (xhr.status == 0)
        alert('error');

¹_{https://web.archive.org/web/20120204040047/http://www.w3.org/TR/XMLHttpRequest/#the-status-attribute}

1 https:/ /web.archive.org/web/20120204040047/http:/www.w3.org/TR/XMLHttpRequest/ # status属性

#2

Checking the status didn't work for me, but

检查状态对我来说不是工作，但是。

// Ignore incomplete requests, likely due to navigating away from the page
if (jqXHR.readyState < 4) {
    return true;
}

in the error handler did (4 being DONE).

在错误处理程序中完成了(已完成4项)。

#3

I've had to handle this issue too a couple of times.

这个问题我也得处理好几次。

I'd recommend binding to the $(window).unload event, setting some variable somewhere, such as in your namespace (App.unloading = true) and then testing it in ajax error callbacks.

我建议您绑定$(窗口)。卸载事件，在某个地方设置某个变量，例如在名称空间中(app. unload = true)，然后在ajax错误回调中测试它。

See http://api.jquery.com/unload/

参见http://api.jquery.com/unload/

#1