ASP.NET MVC应用程序中的JQuery ajax parsererror

Question

我试图通过JQuery ajax方法调用ASP.NET MVC actionMethod.我的代码如下:

$('.Delete').live('click', function() {
    var tr = $(this).parent().parent();

    $.ajax({
        type: 'DELETE',
        url: '/Routing/Delete/' + tr.attr('id'),
        contentType: 'application/json; charset=utf-8',
        data: '{}',
        dataType: 'json',
        error: function(XMLHttpRequest, textStatus, errorThrown) {
            alert("Error: " + textStatus + " " + errorThrown);
            alert(XMLHttpRequest.getAllResponseHeaders());
        },
        success: function(result) {
            // Remove TR element containing waypoint details
            alert("Success");
            $(tr).remove();
        }
    });
});

我的行动方法是:

[AcceptVerbs(HttpVerbs.Delete)]
public string Delete(int id)
{
    // Deletion code

    return " ";
}

当我读到某个地方时,我返回一个空字符串,如果内容长度为0则会导致问题,当返回类型为字符串时,我会收到一个警告框,上面写着"错误:错误未定义",第二个警告框为空.

如果我使返回类型为void,则会收到一条警告"Error:parsererror undefined",第二个警告如下:

Server: ASP.NET Development Server/9.0.0.0
Date: Wed, 22 Jul 2009 08:27:20 GMT
X-AspNet-Version: 2.0.50727
X-AspNetMvc-Version: 1.0
Cache-Control: private
Content-Length: 0
Connection: Close

Answer 1

你的jQuery调用期望Json返回请求.所以:

[AcceptVerbs(HttpVerbs.Delete)]
public JsonResult Delete(int id) {
    // Deletion code
    return Json("");
}

而且我同意redsquare,最好返回这样的逻辑消息:

[AcceptVerbs(HttpVerbs.Delete)]
public JsonResult Delete(int id) {
    // Deletion code
    return Json(new { Success = true });
}

//then in your jQuery function you can check the result this way :
success: function(result) {
    if (result.Success) {
        alert("it was deleted!");
    }
    else {
        alert("something went wrong");
    }
}