AJAX responseText未定义 [英] AJAX responseText undefined

问题描述

JavaScript代码:

Javascript code:

...............
...............
var cutid = $(th).attr("data-cutid");

var request = $.ajax({
    type: "POST",
    contentType: "application/json; charset=utf-8",
    url: "Services/Cut.asmx/CheckCuts",
    data: "{'cuts':" + JSON.stringify(ListCuts) + ",'idCut':'" + cutid + "'}",
    dataType: "json"
}).responseText;

alert(request); // undefined

网络服务的功能:

    [WebMethod]        
    public string CheckCuts(List<CutM> cuts, Guid idCut)
    {
        return UtilCut.CheckCuts(cuts, idCut).ToString();
    }

responseText未定义.为什么?

The responseText is undefined. Why?

我在ajax请求中添加了 async:false . 将async设置为false意味着您要调用的语句必须先完成，然后才能调用函数中的下一条语句.

I added async: false to ajax request. Setting async to false means that the statement you are calling has to complete before the next statement in your function can be called.

此代码有效:

function AjaxCheckCuts(ListCuts,cutid) 
{
    var request = $.ajax({
    type: "POST",
    contentType: "application/json; charset=utf-8",
    url: "Services/Cut.asmx/CheckCuts",
    async: false,
    data: "{'cuts':" + JSON.stringify(ListCuts) + ",'idCut':'" + cutid + "'}",
    dataType: "json"       
    }).responseText;

    var r = jQuery.parseJSON(request);
    r = r.d;
    return r;
}

推荐答案

Web服务是否正常运行?返回HTTP 200吗?您能看到使用F12工具或Fiddler返回的数据吗?

Is the web service working correctly? Is it returning a HTTP 200? Can you see the data that is being returned using F12 tools or Fiddler?

$.ajax()返回延迟.定义一个done方法，使其在异步调用完成时执行.没有responseText属性，这就是为什么它返回undefined的原因.

$.ajax() is returning a deferred. Define a done method for it to execute when the async call completes. There is no responseText property, that's why it is returning a undefined.

尝试一下:

var cutid = $(th).attr("data-cutid");

var request = $.ajax({
    type: "POST",
    contentType: "application/json; charset=utf-8",
    url: "Services/Cut.asmx/CheckCuts",
    data: "{'cuts':" + JSON.stringify(ListCuts) + ",'idCut':'" + cutid + "'}",
    dataType: "json"
});

request.done(function(result){
    alert(result);
});

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