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我正在尝试根据特定查询显示谷歌饼图，但我得到的结果是：[["Status","TotalProgress"],["Completed",1],["In-Progress",2], ["To-Do",1]] 应该是：

我的代码中预期的饼图 场景如下：主管想要查看选定的学生进度：控制器方法（我使用了本教程，但它不包括“id”因素）： 链接到我使用的教程

控制器方法：

 public JsonResult AjaxMilestoneStatus(string id)
    {

        string query = $"SELECT Status, COUNT(Progress) AS TotalProgress from Milestone  
       Where StudentNumber = '{id}' GROUP BY Status";
        // string query = "SELECT Status, COUNT(Progress) AS TotalProgress from 
       Milestone GROUP BY Status ";

        string constr = 
         ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;

        List<object> chartData = new List<object>();
        chartData.Add(new object[]
                        {
                        "Status", "TotalProgress"
                        });
        using (var con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand(query))
            {
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                con.Open();
                using (SqlDataReader sdr = cmd.ExecuteReader())
                {
                    while (sdr.Read())
                    {
                        chartData.Add(new object[]
                        {
                        sdr["Status"], sdr["TotalProgress"]
                        });
                    }
                }

                con.Close();
            }
        }

        return Json(chartData, JsonRequestBehavior.AllowGet);
    }

然后视图如下所示：

enter code here

<!DOCTYPE HTML>
<html>
<head>
<script src="~/Scripts/jquery-3.3.1.js"></script>


</head>
<body>
<h1></h1>

@*<div id="chartContainer" style="height: 370px; width: 100%;"></div>*@
<script type="text/javascript" 
src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<script type="text/javascript" 
src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
    google.load("visualization", "1", { packages: ["corechart"] });
    google.setOnLoadCallback(drawChart);
    function drawChart() {
         $.ajax({
            type: "Get",
             url: "/CHART/AjaxMilestoneStatus",

            data: '{id: id}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (r) {
                var data =  google.visualization.arrayToDataTable(r);

                //Pie
                var options = {
                    title: 'My Progress'
                };
                var chart = new google.visualization.PieChart($("#chart")[0]);

                chart.draw(data,options);
            },
            failure: function (r) {
                alert(r.d);
            },
            error: function (r) {
                alert(r.d);
            }

        });
    }
   </script>

   <div id="chart" style="width: 500px; height: 400px;"></div>

`

我在某处读过，如果我应该这样做，我应该在我的控制器中调用 jsonresult 方法来查看视图，请帮助我，我真的很挣扎，请帮助！谢谢你。

4

1 回答 1

0

在此处输入图像描述

看法

@{
    Layout = null;
}
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
        google.load("visualization", "1", { packages: ["corechart"] });
        google.setOnLoadCallback(drawChart);
        function drawChart() {
            $.ajax({
                type: "GET",
                //my url is different than yours
                //url: "/CHART/AjaxMilestoneStatus",
                url: "/Home/AjaxMilestoneStatus",
                //took off parens in my data
                data: { id: $("#aHidden").val() },
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (r) {
                    var data = google.visualization.arrayToDataTable(r);
                    //Pie
                    var options = {
                        title: 'My Progress'
                    };
                    var chart = new google.visualization.PieChart($("#chart")[0]);
                    chart.draw(data, options);
                },
                failure: function (r) {
                    alert(r.d);
                },
                error: function (r) {
                    alert(r.d);
                }
            });
        }
    </script>
    <input type="hidden" id="aHidden" value="2" />
    <div id="chart" style="width: 500px; height: 400px;">
    </div>
</body>
</html>

控制器

    public JsonResult AjaxMilestoneStatus(string id)  
    {
        //swapped {id} with {0}
        string query = String.Format(@"SELECT Status, COUNT(Progress) AS TotalProgress from Milestone Where StudentNumber = '{0}' GROUP BY Status",
                                        id);

        string constr =
         ConfigurationManager.ConnectionStrings["Constring"].ConnectionString;

        List<object> chartData = new List<object>();
        chartData.Add(new object[]
                    {
                    "Status", "TotalProgress"
                    });
        using (var con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand(query))
            {
                cmd.CommandType = CommandType.Text;
                cmd.Connection = con;
                con.Open();
                using (SqlDataReader sdr = cmd.ExecuteReader())
                {
                    while (sdr.Read())
                    {
                        chartData.Add(new object[]
                    {
                    sdr["Status"], sdr["TotalProgress"]
                    });
                    }
                }

                con.Close();
            }
        }

        return Json(chartData, JsonRequestBehavior.AllowGet);
    }
于 2018-09-19T18:20:58.427 回答