Markers in Blazor Charts Component

13 Sep 20249 minutes to read

Data markers are used to provide information about the data points in a series. Each data point can be adorned with a shape.

Markers

Markers can be added to the points by enabling the Visible property to true of ChartMarker.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartSeriesCollection>
        <ChartSeries DataSource="@ConsumerReports" XName="X" YName="Y" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10"/>            
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public double X { get; set; }
        public double Y { get; set; }
    }

    public List<ChartData> ConsumerReports = new List<ChartData>
	{
		new ChartData{ X= 2005, Y= 28 },
		new ChartData{ X= 2006, Y= 25 },
		new ChartData{ X= 2007, Y= 26 },
		new ChartData{ X= 2008, Y= 27 },
		new ChartData{ X= 2009, Y= 32 },
		new ChartData{ X= 2010, Y= 35 },
		new ChartData{ X= 2011, Y= 30 }
	};
}

Data Markers in Blazor Line Chart

Shape

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

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartSeriesCollection>
        <ChartSeries DataSource="@ConsumerReports" XName="X" YName="Y" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" Shape="ChartShape.Diamond"/>            
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public double X { get; set; }
        public double Y { get; set; }
    }

    public List<ChartData> ConsumerReports = new List<ChartData>
	{
		new ChartData{ X= 2005, Y= 28 },
		new ChartData{ X= 2006, Y= 25 },
		new ChartData{ X= 2007, Y= 26 },
		new ChartData{ X= 2008, Y= 27 },
		new ChartData{ X= 2009, Y= 32 },
		new ChartData{ X= 2010, Y= 35 },
		new ChartData{ X= 2011, Y= 30 }
	};
}

Blazor Line Chart with Diamond Marker

Auto marker shape

By default, the chart marker shape is set to Auto. When Auto is set and marker is enabled in the chart at the same time, each series is rendered with a unique marker shape.

@using Syncfusion.Blazor.Charts

<SfChart ID="container">    
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.DateTimeCategory" Format="yyyy"></ChartPrimaryXAxis>
    <ChartSeriesCollection>
        <ChartSeries Name="Series1" DataSource="@ConsumerReports" XName="X" YName="Y1" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" IsFilled="true"/>
        </ChartSeries>
        <ChartSeries Name="Series2" DataSource="@ConsumerReports" XName="X" YName="Y2" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" IsFilled="true" />
        </ChartSeries>
        <ChartSeries Name="Series3" DataSource="@ConsumerReports" XName="X" YName="Y3" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" IsFilled="true" />
        </ChartSeries>
        <ChartSeries Name="Series4" DataSource="@ConsumerReports" XName="X" YName="Y4" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" IsFilled="true" />
        </ChartSeries>
        <ChartSeries Name="Series5" DataSource="@ConsumerReports" XName="X" YName="Y5" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" IsFilled="true" />
        </ChartSeries>
        <ChartSeries Name="Series6" DataSource="@ConsumerReports" XName="X" YName="Y6" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" IsFilled="true" />
        </ChartSeries>       
    </ChartSeriesCollection>
</SfChart>

@code {
    public class ChartData
    {
        public DateTime X { get; set; }
        public double Y { get; set; }
        public double Y1 { get; set; }
        public double Y2 { get; set; }
        public double Y3 { get; set; }
        public double Y4 { get; set; }
        public double Y5 { get; set; }
        public double Y6 { get; set; }       
    }

    public List<ChartData> ConsumerReports = new List<ChartData>
    {
        new ChartData{ X= new DateTime(2005,01,01), Y1 = 100, Y2 = 190, Y3 = 40, Y4 = 125, Y5 = 160, Y6 = 80 },
        new ChartData{ X= new DateTime(2006,01,01), Y1 = 120, Y2 = 140, Y3 = 100, Y4 = 190, Y5 = 170, Y6 = 30 },
        new ChartData{ X= new DateTime(2007,01,01), Y1 = 110, Y2 = 80, Y3 = 60, Y4 = 125, Y5 = 140, Y6 = 40 },
        new ChartData{ X= new DateTime(2008,01,01), Y1 = 40, Y2 = 120, Y3 = 75, Y4 = 180, Y5 = 150, Y6 = 90 },
        new ChartData{ X= new DateTime(2009,01,01), Y1 = 170, Y2 = 80, Y3 = 30, Y4 = 125, Y5 = 140, Y6 = 100 },
    };     
}

Blazor Chart with different marker shapes

Images

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

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartSeriesCollection>
        <ChartSeries DataSource="@ConsumerReports" XName="X" YName="Y" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" ImageUrl="https://ej2.syncfusion.com/demos/src/chart/images/cloud.png">
            </ChartMarker>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public double X { get; set; }
        public double Y { get; set; }
    }

    public List<ChartData> ConsumerReports = new List<ChartData>
	{
		new ChartData{ X= 2005, Y= 28 },
		new ChartData{ X= 2006, Y= 25 },
		new ChartData{ X= 2007, Y= 26 },
		new ChartData{ X= 2008, Y= 27 },
		new ChartData{ X= 2009, Y= 32 },
		new ChartData{ X= 2010, Y= 35 },
		new ChartData{ X= 2011, Y= 30 }
	};
}

Fill marker with series color

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

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category">
    </ChartPrimaryXAxis>
    <ChartSeriesCollection>
        <ChartSeries DataSource="@ConsumerReports" XName="X" YName="Y" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" IsFilled="true">
            </ChartMarker>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public double X { get; set; }
        public double Y { get; set; }
    }

    public List<ChartData> ConsumerReports = new List<ChartData>
	{
		new ChartData{ X= 2005, Y= 28 },
		new ChartData{ X= 2006, Y= 25 },
		new ChartData{ X= 2007, Y= 26 },
		new ChartData{ X= 2008, Y= 27 },
		new ChartData{ X= 2009, Y= 32 },
		new ChartData{ X= 2010, Y= 35 },
		new ChartData{ X= 2011, Y= 30 }
	};
}

Blazor Line Chart with Custom Markers

Customization

Markers color can be customized using Fill property and the border color and width can be customized based on the specified value in ChartMarkerBorder.

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category">
    </ChartPrimaryXAxis>

    <ChartSeriesCollection>
        <ChartSeries DataSource="@ConsumerReports" XName="X" YName="Y" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Height="10" Width="10" Fill="red">
                <ChartMarkerBorder Width="2" Color="blue"></ChartMarkerBorder>
            </ChartMarker>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public double X { get; set; }
        public double Y { get; set; }
    }

    public List<ChartData> ConsumerReports = new List<ChartData>
	{
		new ChartData{ X= 2005, Y= 28 },
		new ChartData{ X= 2006, Y= 25 },
		new ChartData{ X= 2007, Y= 26 },
		new ChartData{ X= 2008, Y= 27 },
		new ChartData{ X= 2009, Y= 32 },
		new ChartData{ X= 2010, Y= 35 },
		new ChartData{ X= 2011, Y= 30 }
	};
}