Data Markers in ASP.NET MVC Chart Component

23 Jun 202316 minutes to read

Data markers are used to provide information about the data points in the series. You can add a shape to adorn each data point.

Marker

Markers can be added to points by enabling the Visible option of the marker property. By default, distinct markers will be enabled for each series in the chart.

CSHTML

@Html.EJS().Chart("container").Series(series =>
   {
      series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Line).
      Marker(mr=>mr.Visible(true))
      XName("x").
      YName("y").
      DataSource(ViewBag.dataSource).
      Width(2).Add();

      series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Line).
      Marker(mr=>mr.Visible(true))
      XName("x").
      YName("y1").
      DataSource(ViewBag.dataSource).
      Width(2).Add();
   }).
   Title("Olympic Medal Counts - RIO").Render()

Marker.cs

public ActionResult Index()
        {
            List<VerticalData> chartData = new List<VerticalData>
            {
               new VerticalData{ x= 2005, y= 28, y1= 18 },
               new VerticalData{ x= 2006, y= 25, y1= 10 },
               new VerticalData{ x= 2007, y= 26, y1= 20 }, 
               new VerticalData{ x= 2008, y= 27, y1= 35 },
               new VerticalData{ x= 2009, y= 32, y1= 23 },
               new VerticalData{ x= 2010, y= 35, y1= 25 }, 
               new VerticalData{ x= 2011, y= 30, y1= 15 }
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class VerticalData
        {
            public double x;
            public double y;
            public double y1;
        }

Shape

Markers can be assigned with different shapes such as Rectangle, Circle, Diamond etc using the Shape property.

CSHTML

@Html.EJS().Chart("container").Series(series =>
   {
   series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
   Marker(ViewBag.Marker).
   XName("x").
   YName("yValue").
   DataSource(ViewBag.dataSource).
   Name("Gold").
   Width(2).Add();
   }).
   PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).
   Title("Olympic Medal Counts - RIO").Render()

Shape.cs

public ActionResult Index()
        {
            List<VerticalData> chartData = new List<VerticalData>
            {
               new VerticalData{ x= 2005, y= 28 },
               new VerticalData{ x= 2006, y= 25 },
               new VerticalData{ x= 2007, y= 26 }, 
               new VerticalData{ x= 2008, y= 27 },
               new VerticalData{ x= 2009, y= 32 },
               new VerticalData{ x= 2010, y= 35 }, 
               new VerticalData{ x= 2011, y= 30 }
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class VerticalData
        {
            public double x;
            public double y;
        }

NOTE

To know more about the marker shape type refer the Shape.

Images

Apart from the shapes, you can also add custom images to mark the data point using the ImageUrl property.

CSHTML

@ControlSecction {
@Html.EJS().Charts("container").Series(series =>
   {
   series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
   Marker(ViewBag.Marker).
   XName("x").
   YName("yValue").
   DataSource(ViewBag.dataSource).
   Name("Gold").
   Width(2).Add();
   }).
   PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).
   Title("Olympic Medal Counts - RIO").Render()
}

Images.cs

public ActionResult Index()
        {
            List<VerticalData> chartData = new List<VerticalData>
            {
               new VerticalData{ x= 2005, y= 28 },
               new VerticalData{ x= 2006, y= 25 },
               new VerticalData{ x= 2007, y= 26 }, 
               new VerticalData{ x= 2008, y= 27 },
               new VerticalData{ x= 2009, y= 32 },
               new VerticalData{ x= 2010, y= 35 }, 
               new VerticalData{ x= 2011, y= 30 }
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class VerticalData
        {
            public double x;
            public double y;
        }

Customization

Marker’s color and border can be customized using Fill and Border properties.

CSHTML

@Html.EJS().Chart("container").Series(series =>
   {
   series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Spline).
   Marker(ViewBag.Marker).
   XName("x").
   YName("yValue").
   DataSource(ViewBag.dataSource).
   Name("Gold").
   Width(2).Add();
   }).
   PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).
   Title("Olympic Medal Counts - RIO").Render()

Custom.cs

public ActionResult Index()
        {
            List<VerticalData> chartData = new List<VerticalData>
            {
               new VerticalData{ x= 2005, y= 28 },
               new VerticalData{ x= 2006, y= 25 },
               new VerticalData{ x= 2007, y= 26 }, 
               new VerticalData{ x= 2008, y= 27 },
               new VerticalData{ x= 2009, y= 32 },
               new VerticalData{ x= 2010, y= 35 }, 
               new VerticalData{ x= 2011, y= 30 }
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class VerticalData
        {
            public double x;
            public double y;
        }

Customizing specific point

You can also customize the specific marker and label using PointRender event. The PointRender event allows you to change the shape, color and border for a point.

CSHTML

@Html.EJS().Chart("container").Series(series =>
   {
   series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Area).
   Marker(ViewBag.Marker).
   XName("x").
   YName("yValue").
   DataSource(ViewBag.dataSource).
   Name("Gold").
   Width(2).Add();
   }).
   PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).
   Title("Olympic Medal Counts - RIO").PointRender("point").Render()
   <script>
   function point(args) {
       if(args.point.index === 1)  {
           args.shape = "Circle"
       }
   }
   </script>

Custom-point.cs

public ActionResult Index()
        {
            List<VerticalData> chartData = new List<VerticalData>
            {
               new VerticalData{ x= 2005, y= 28 },
               new VerticalData{ x= 2006, y= 25 },
               new VerticalData{ x= 2007, y= 26 }, 
               new VerticalData{ x= 2008, y= 27 },
               new VerticalData{ x= 2009, y= 32 },
               new VerticalData{ x= 2010, y= 35 }, 
               new VerticalData{ x= 2011, y= 30 }
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class VerticalData
        {
            public double x;
            public double y;
        }

Fill marker with series color

Marker can be filled with the series color by setting the IsFilled property to true.

CSHTML

@Html.EJS().Chart("container").Series(series =>
   {
   series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Area).
   Marker(mr=>mr.Visible(true).IsFilled(true)).
   XName("x").
   YName("yValue").
   DataSource(ViewBag.dataSource).
   Name("Gold").
   Width(2).Add();
   }).
   PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).
   Title("Olympic Medal Counts - RIO").PointRender("point").Render()

IsFilled.cs

public ActionResult Index()
        {
            List<VerticalData> chartData = new List<VerticalData>
            {
               new VerticalData{ x= 2005, y= 28 },
               new VerticalData{ x= 2006, y= 25 },
               new VerticalData{ x= 2007, y= 26 }, 
               new VerticalData{ x= 2008, y= 27 },
               new VerticalData{ x= 2009, y= 32 },
               new VerticalData{ x= 2010, y= 35 }, 
               new VerticalData{ x= 2011, y= 30 }
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class VerticalData
        {
            public double x;
            public double y;
        }