jQuery AJAX 在窗口卸载时触发错误回调 - 如何过滤掉卸载并只捕获真正的错误?

问题描述

如果我在 $.ajax() 请求中间离开页面，它会触发错误回调.我已经在 Safari 和 FF 中测试了 GET 和 POST 请求.

If I navigate away from a page in the middle of an $.ajax() request it fires the error callback. I've tested in Safari and FF with both GET and POST requests.

一种可能的解决方案是在页面卸载时中止所有 AJAX 请求，但在卸载之前调用错误处理程序，因此这似乎是不可能的.

One potential solution would be to abort all AJAX requests on page unload, but the error handler is called before unload, so this doesn't seem possible.

我希望能够通过礼貌警报或模式对话框在客户端优雅地处理诸如 500 之类的真实错误，但我不希望在用户离开页面时调用此处理.

I want to be able to handle REAL errors such as 500s gracefully on the client side with a polite alert or a modal dialog, but I don't want this handling to be called when a user navigates away from the page.

我该怎么做?

--

(也很奇怪:当导航离开页面时，错误处理程序说 textStatus 参数是错误"，它在接收 500/bad 请求时抛出相同.)

(Also strange: When navigating away from a page, the error handler says that the textStatus parameter is "error", the same it throws when receiving a 500/bad request.)

推荐答案

在错误回调或$.ajax 你有三个输入参数:

In the error callback or $.ajax you have three input arguments:

function (XMLHttpRequest, textStatus, errorThrown) {
   this; // options for this ajax request
}

可以直接查看xhr.status获取HTTP响应码，例如:

You can check directly the xhr.status to get the HTTP response code, for example:

$.ajax({
  url: "test.html",
  cache: false,
  success: function(html){
    $("#results").append(html);
  },
  error: function (xhr, textStatus) {
    if (xhr.status == 500) {
      alert('Server error: '+ textStatus);
    }
  }
});

区分浏览器断开的连接和服务器关闭的情况(jasonmerino 的评论):

To tell the difference between a connection broken by the browser and the case where the server is down (jasonmerino's comment):

卸载时 xhr.readyState 应为 0，其中表示无响应服务器的 xhr.readyState 应该是 4.

On unload the xhr.readyState should be 0, where for a non responsive server the xhr.readyState should be 4.

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