morris.js和asmx wrbservice

Question

我在asp.net webservice中使用morris.js时遇到了一些问题，下面是我的js代码：

    function Graph() {
        var dd = JSON.stringify({ "panum": pnum, "rubnum" : rnum });

        $.ajax({
            type: 'GET',
            url: "MyService.asmx/Getchartdata",
            dataType: 'json',
            async: false,
            contentType: "application/json; charset=utf-8",
            data: dd,
            success: function (result) {
                dd = result; // also tried data.d
            },
            error: function (xhr, status, error) {
                alert(error);
            }
        });

        return dd;
    }


    $(document).ready(function () {

        Morris.Line({
            element: 'area-example',
            data: Graph(),
            xkey: 'DAT',
            ykeys: ['VAL'],
            labels: ['VAL'],
            smooth: false
        });
    });
</script>

这里是我的webservice方法的代码

   public class ChartPointClass
{
    public string DAT { get; set; }

    public string VAL { get; set; }
}


[ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = false)]
[WebMethod(EnableSession = true)]
public string Getchartdata(int panum, int rubnum)
{
    string result = "";

    using (Entities me = ContextFactory.ObtainContext())
    {


        var q = from n in me.VISRUBs.Where(a => a.RUBNUM == rubnum && a.VISANA.VISITE.PANUM == panum)
                .OrderBy(a => a.VISANA.VISITE.DATEVIS).ToList()

                select new ChartPointClass()
                {
                    DAT = String.Format("{0:dd/MM/yyyy}", (DateTime)n.VISANA.VISITE.DATEVIS.Value),
                    VAL = n.VALEUR
                };



        JavaScriptSerializer serializer = new JavaScriptSerializer();
        result = serializer.Serialize(q.ToList());
        return result;
    }

}

我还检查了从我的web服务返回的数据是否为以下格式

<string xmlns="http://MyWebsite.net/WebServices">

{"DAT":"12/01/2015"，"VAL":"0.92"}，{"DAT":"22/01/2015"，"VAL":"1.00"}，{"DAT":"15/02/2015"，"VAL":"0.98"}

问题是此设置的内部服务器错误和控制台中的错误未捕获TypeError: Cannot read property 'match‘of undefined。

你知道我错过了什么吗？

Answer 1

    function CreateGraph(dt) {

        Morris.Line({
            element: 'area-example',
            data: $.parseJSON(dt),
            xkey: 'DAT',
            ykeys: ['VAL'],
            labels: ['VAL'],
            smooth: false,
            parseTime: false
        });
    }


    $(document).ready(function () {


        var dd = JSON.stringify({ "panum": 5211, "rubnum": 22});
        $.ajax({
            type: 'POST',
            url: "MyWebService.asmx/Getchartdata",
            dataType: 'json',
            async: false,
            contentType: "application/json; charset=utf-8",
            data: dd,
            success: function (result) {

                CreateGraph(result.d)
            },
            error: function (xhr, status, error) {
                alert(error);
            }
        });

    });

解析时间参数是一个关键元素。