Category Axis in Blazor Chart component

Category axis are used to represent the string values instead of numbers.

column.razor

@using Syncfusion.Blazor.Charts

<SfChart Width="60%">
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category">
    </ChartPrimaryXAxis>

    <ChartSeriesCollection>
        <ChartSeries DataSource="@MedalDetails" XName="X" YName="YValue" Type="ChartSeriesType.Column">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public string X;
        public double YValue;
    }

    public List<ChartData> MedalDetails = new List<ChartData>
{
        new ChartData { X= "USA", YValue= 46 },
        new ChartData { X= "GBR", YValue= 27 },
        new ChartData { X= "CHN", YValue= 26 },
        new ChartData { X= "UK", YValue= 23 },
        new ChartData { X= "AUS", YValue= 16 },
        new ChartData { X= "IND", YValue= 36 },
        new ChartData { X= "DEN", YValue= 12 },
        new ChartData { X= "MEX", YValue= 20 },
     };
}

Labels Placement

By default, category labels are placed between the ticks in an axis, this can also be placed on ticks using LabelPlacement property.

placement.razor

@using Syncfusion.Blazor.Charts

<SfChart Width="60%">
    <ChartPrimaryXAxis LabelPlacement="LabelPlacement.OnTicks" ValueType="Syncfusion.Blazor.Charts.ValueType.Category">
    </ChartPrimaryXAxis>

    <ChartSeriesCollection>
        <ChartSeries DataSource="@MedalDetails" XName="X" YName="YValue" Type="ChartSeriesType.Column">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public string X;
        public double YValue;
    }
    public List<ChartData> MedalDetails = new List<ChartData>
{
        new ChartData { X= "USA", YValue= 46 },
        new ChartData { X= "GBR", YValue= 27 },
        new ChartData { X= "CHN", YValue= 26 },
        new ChartData { X= "UK", YValue= 23 },
        new ChartData { X= "AUS", YValue= 16 },
        new ChartData { X= "IND", YValue= 36 },
        new ChartData { X= "DEN", YValue= 12 },
        new ChartData { X= "MEX", YValue= 20 },
     };
}

Labels Placement

Range and Interval

Range of the category axis can be customized using Minimum, Maximum and Interval property of the axis.

range.razor

@using Syncfusion.Blazor.Charts

<SfChart Width="60%">
    <ChartPrimaryXAxis Maximum="5" Minimum="1" Interval="2" ValueType="Syncfusion.Blazor.Charts.ValueType.Category">
    </ChartPrimaryXAxis>

    <ChartSeriesCollection>
        <ChartSeries DataSource="@MedalDetails" XName="X" YName="YValue" Type="ChartSeriesType.Column">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class ChartData
    {
        public string X;
        public double YValue;
    }
    public List<ChartData> MedalDetails = new List<ChartData>
{
        new ChartData { X= "USA", YValue= 46 },
        new ChartData { X= "GBR", YValue= 27 },
        new ChartData { X= "CHN", YValue= 26 },
        new ChartData { X= "UK", YValue= 23 },
        new ChartData { X= "AUS", YValue= 16 },
        new ChartData { X= "IND", YValue= 36 },
        new ChartData { X= "DEN", YValue= 12 },
        new ChartData { X= "MEX", YValue= 20 },
     };
}

Range

Indexed category axis

Category axis also can be rendered based on the index values of data source. This can be achieved by defining the IsIndexed property to true in the axis.

index.razor

@using Syncfusion.Blazor.Charts

<SfChart Width="60%">
    <ChartPrimaryXAxis IsIndexed="true" ValueType="Syncfusion.Blazor.Charts.ValueType.Category">
    </ChartPrimaryXAxis>

    <ChartSeriesCollection>
        <ChartSeries DataSource="@WeatherReports1" XName="X" YName="Y" Type="ChartSeriesType.Column">
        </ChartSeries>
        <ChartSeries DataSource="@WeatherReports2" XName="X" YName="Y" Type="ChartSeriesType.Column">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{
    public class WeatherData
    {
        public string X;
        public double Y;
    }

    public List<WeatherData> WeatherReports1 = new List<WeatherData>
  {
         new WeatherData{ X= "Myanmar", Y= 7.3 },
         new WeatherData{ X= "India", Y= 7.9 },
         new WeatherData{ X= "Bangladesh", Y= 6.8 },
         new WeatherData{ X= "Cambodia", Y=7.0 },
         new WeatherData{ X= "China", Y= 6.9 }
      };

    public List<WeatherData> WeatherReports2 = new List<WeatherData>
{
         new WeatherData{ X= "Poland", Y=2.7 },
         new WeatherData{ X= "Australia", Y=2.5 },
         new WeatherData{ X= "Singapore", Y=2.0 },
         new WeatherData{ X= "Canada", Y=1.4 },
         new WeatherData{ X= "Germany", Y=1.8 }
     };
}

Indexed category axis

Category Axis in Blazor Chart component

Labels Placement

Range and Interval

Indexed category axis

See Also