AJAX错误：完成此操作所需的数据不可用 [英] AJAX Error: The data necessary to complete this operation is unavailable

问题描述

每当我向AJAX请求发送一个返回一个类型为text / plain的小响应的处理程序时，我会在IE中收到这个错误。似乎这个错误会开始发生，发生几次，然后它会停止。非常讨厌。

Every once and a while I get this error in IE when making an AJAX request to a handler that returns a small response of type text/plain. It seems that this error will start happening, occur a few times, and then it will stop. Very annoying.

我正在使用最新的jQuery库。当我尝试访问xhr.responseText时，该错误会抛出在complete（）函数中。如何防止这种情况发生？

I am using the latest jQuery library. The error throws in the complete() function when I try to access xhr.responseText. How can I prevent this from happening?

  $.ajax({
    url: "Inquire.ashx",
    data: data,
    dataType: "text",
    timeout: 5000,
    complete: function(xhr, status) {
      var resp = xhr.responseText; // ERROR!

      if(resp.substr(0, 4) == "http")
        window.open(resp, "PopWin");
      else
        showError(resp);
    }
  });

推荐答案

事实证明，错误是因为XmlHttpRequest的 readyState 属性为3，这意味着请求仍在进行中。我不明白为什么jQuery在readyState为4之前触发我的完整功能！我把它放在我成功回调的最顶端，并且没有看到错误，因为...

As it turns out, the error was caused because the readyState property of XmlHttpRequest was at 3, which means the request is still in process. I don't understand why jQuery fires my complete function before readyState is 4! I put this at the very top of my success callback, and have not seen the error since...

  if(xhr && xhr.readyState != 4) {
    setTimeout(arguments.callee, 50);
    return;
  }

这是一个非常丑的解决方案，我讨厌，但似乎修复问题。

This is a very ugly solution that I hate, but it seems to fix the problem.

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