AJAX错误：要完成此操作的数据是不可用 [英] AJAX Error: The data necessary to complete this operation is unavailable

问题描述

每一次，一段时间，我做一个AJAX请求处理程序返回类型text / plain的一个小的反响时出现在IE这个错误。看来，这个错误会开始发生，发生了几下，然后它会停下来。非常讨厌。

我使用的是最新的jQuery库。在完整的（）函数的错误抛出，当我尝试访问xhr.responseText。我怎样才能prevent这种情况的发生？

  $。阿贾克斯（{
    网址：Inquire.ashx
    数据：数据，
    数据类型：文本，
    超时：5000，
    完成：功能（XHR，状态）{
      VAR RESP = xhr.responseText; // 错误！

      如果（resp.substr（0，4）==的http）
        的window.open（RESP，PopWin）;
      其他
        showError（RESP）;
    }
  }）;
 

解决方案

事实证明，该错误造成的，因为在的 readyState的财产是在3，这意味着该请求仍在处理中。我不明白为什么jQuery的触发我的完整功能之前，readyState为4！我把这个在我的成功回调的最顶端，而没有看到错误，因为...

 如果（XHR＆安培;＆安培;！xhr.readyState = 4）{
    的setTimeout（arguments.callee的，50）;
    返回;
  }
 

这是我最讨厌一个很丑陋的解决方案，但它似乎解决问题。

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.

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);
    }
  });

解决方案

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;
  }

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

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