使用JSONP时，如何捕获jQuery $ .getJSON（或数据类型设置为'jsonp'的$ .ajax）错误？

问题描述

在jQuery中使用JSONP时是否可以捕获错误？我已经尝试了$ .getJSON和$ .ajax方法，但都没有捕获我正在测试的404错误。这是我尝试过的（请记住，这些都能成功运行，但我想在失败的情况下处理）：

Is it possible to catch an error when using JSONP with jQuery? I've tried both the $.getJSON and $.ajax methods but neither will catch the 404 error I'm testing. Here is what I've tried (keep in mind that these all work successfully, but I want to handle the case when it fails):

jQuery.ajax({
    type: "GET",
    url: handlerURL,
    dataType: "jsonp",
    success: function(results){
        alert("Success!");
    },
    error: function(XMLHttpRequest, textStatus, errorThrown){
        alert("Error");
    }
});

还有：

jQuery.getJSON(handlerURL + "&callback=?",
    function(jsonResult){
        alert("Success!");
    });

我也尝试添加$ .ajaxError，但这也不起作用：

I've also tried adding the $.ajaxError but that didn't work either:

jQuery(document).ajaxError(function(event, request, settings){
   alert("Error");
});

提前感谢您的回复！

推荐答案

似乎没有返回成功结果的JSONP请求永远不会触发任何事件，成功或失败，无论是好是坏还是显而易见的设计。

It seems that JSONP requests that don't return a successful result never trigger any event, success or failure, and for better or worse that's apparently by design.

搜索他们的bug追踪器之后，有这可能是使用超时回调的可能解决方案。请参阅。如果您无法捕获错误，您可以在等待合理的时间成功后至少超时。

After searching their bug tracker, there's a patch which may be a possible solution using a timeout callback. See bug report #3442. If you can't capture the error, you can at least timeout after waiting a reasonable amount of time for success.

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