jQuery.ajax响应数据未定义

问题描述

这是我的控制器操作中的代码:

Here is the code in my Controller Action:

[HttpPost]
public JsonResult MyAction()
{
    try
    {
        // Do something...

        return Json(new { Success = true });
    }
    catch(Exception ex)
    {
        return Json(new { Error = ex.Message });
    }
}

而且，这是我的脚本:

<script>
    $.ajax({
        type: "POST",
        url: '@Url.Action("MyAction", "MyController")',
        dataType: 'json'
    }).done(function (data) {
        alert(data.Success);
    }
    })
    .fail(function (data) {
        alert(data.Error);
    });
</script>

这成功完成(警报正确显示为"true")，但是当操作失败时，alert(data.Error)显示Undefined.

This works on success (the alert correctly shows "true"), but when the action fails, alert(data.Error) shows Undefined.

使用FireBug，我可以看到JSON数据已正确返回.为什么data.Error为未定义"?

Using FireBug, I can see that the JSON data is correctly returned. Why is data.Error "Undefined" then?

更新2:

对不起，我的代码出了点问题(不是这里的代码，而是我正在运行的代码). console.log(data)的正确输出是这样的:

Sorry, there was something wrong with my code (not the code here, but the code I was running). The correct output from console.log(data) is this:

Object {Error="Some error."}

推荐答案

来自服务器的两个响应都是成功的json响应.就客户端而言，有关该请求的所有信息均未失败.试试这个:

Both responses from the server are successful json responses. As far as the client is concerned, nothing about the request has failed. Try this:

$.ajax({
    type: "POST",
    url: '@Url.Action("MyAction", "MyController")',
    dataType: 'json'
}).done(function (data) {
    if (data.Success) {
        alert('success!');
    } else {
        alert(data.Error);
    }
})

这篇关于jQuery.ajax响应数据未定义的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！