Charts not showing on ASP.NET MVC page

Question

I am pretty new to asp.net so I tried to add a simple bar chart with charts.js to my view but all I get is an empty page.

Controller

public class HomeController : Controller
{
    // GET: Home
    public ActionResult Index()
    {
        List<string> iData = new List<string>();
        List<string> iData2 = new List<string>();

        iData.Add("Sam");
        iData2.Add("555");
        iData.Add("Alex");
        iData2.Add("666");
        iData.Add("Michael");
        iData2.Add("777");

        ViewBag.Value_List = iData2;
        ViewBag.Name_List = iData;

        return View();
    }
}

View:

@{
    Layout = null;
}
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Charts</title>
    <script src="~/Scripts/Chart.min.js"></script>
    <script src="~/Scripts/jquery-3.3.1.min.js"></script>
    <script>

        var barChartData =
            {
                labels: [@Html.Raw(ViewBag.Name_List)],
                datasets: [{
                    label: 'ChartTest',
                    backgroundColor: [
                        "#f990a7",
                        "#aad2ed",
                        "#9966FF",
                        "#99e5e5",
                        "#f7bd83",
                    ],
                    borderWidth: 2,
                    data: [@ViewBag.Value_List]
                }]
            };

            window.onload = function () {
                var ctx1 =     document.getElementById("barcanvas").getContext("2d");
                window.myBar = new Chart(ctx1,
                    {
                        type: 'bar',
                        data: barChartData,
                        options:
                            {
                                title:
                                {
                                    display: true,
                                    text: "ChartTest"
                                },
                                responsive: true,
                                maintainAspectRatio: true
                            }
                    });
            }
    </script>
</head>
<body>
    <div style="text-align: center">
        <canvas id="barcanvas"></canvas>
    </div>
</body>
</html>

I tried to help me with some tutorials but nothing worked for me.

Can someone tell me what I am doing wrong?

Please format your question next time.

DavidG
– DavidG

2018-06-08 13:43:47 +00:00
Commented Jun 8, 2018 at 13:43 — DavidG
– DavidG, Commented Jun 8, 2018 at 13:43

Mike Smith - MCT · Accepted Answer · 2018-06-11 23:40:45Z

1

Two changes needed:

Serialize the data into JSON in the controller:

using System.Web.Script.Serialization;

var js = new JavaScriptSerializer();
ViewBag.Value_List = js.Serialize( iData2);
ViewBag.Name_List = js.Serialize(iData);

Remove the extra square brackets in the view:

labels: @Html.Raw(ViewBag.Name_List),

data: @Html.Raw(ViewBag.Value_List)

You need to create "drop in" JavaScript to represent the data.

labels: ["555","666","777"] ,

data: ["Sam","Alex","Michael"]

answered Jun 11, 2018 at 23:40

Mike Smith - MCT

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