Question

I am using a Jquery $.post request to get a JSON response that is generated by PHP. When the request is complete, a success or error message is displayed. During development however, I sometimes have PHP errors which end up being returned instead of the JSON. When this happens, I just get the error message:

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

The code I have now looks like this:

var request = $.post(url, data, null, "json");
request.fail(on_failure);
var on_failure = function(jqXHR, text_status, error_thrown)
{
    $("#text_status").empty().append(error_thrown);
};

I would like to be able to show the PHP error if one is returned rather than just indicate that there is a PHP error (just to speed up debugging). Obviously, if a non-JSON parsing error such as HTTP 404 occurs, I still want to display that. I found a method here的末尾，表示我可以使用类似的内容检测此错误

$.ajaxSetup({
    error: function(jqXHR, exception) {
        if (exception === 'parsererror') {
            alert('Requested JSON parse failed.');
        }
    }
});

但它似乎没有帮助我，因为它运行的每个请求而不是单个请求和（据我所知）它不允许访问返回数据中的错误消息。

Answer 1

不确定您使用的是哪个版本的jquery。无论如何，您是否尝试删除json dataType？

var request = $.post(url, data, null);

执行此jQuery将为您猜测dataType。

Answer 2

我讨厌窃取mkross1983的功劳，但他没有回复我的请求，将他的评论转变为答案。 mkross1983说：

您是否尝试在“网络”标签下使用Firebug查看请求的结果？有时可以在那里看到错误，可以提供一些问题的线索

Firebug“Net”标签已被证明是一种有价值的调试工具。通过这种方式，我可以准确地看到发出了什么请求以及发送给它的响应。它甚至允许我查看随请求一起发送的标头和cookie。

谢谢你mkross1983

JQuery AJAX request show AJAX and PHP errors

2 个答案: