How to Customize the Individual Legend Items in Blazor Charts?

This article explains how to customize the individual legend items based on condition in Blazor Charts Component.

Customizing legend items in Blazor Chart

Blazor Chartsprovides support for customizing legend items. You can customize the color, shape, and text of each legend item in the Blazor Chart Component.

This customization can be achieved by handling the OnLegendItemRender event, which triggers before each legend item is rendered.

An event handler is implemented to change the legend shape based on the X name, and this event handler is subscribed to the OnLegendItemRender event.

The code example below demonstrates how to customize individual legends based on conditions in a Blazor Chart:

Index.razor

@using Syncfusion.Blazor.Charts

<SfAccumulationChart Title="Mobile Browser Statistics">

    <AccumulationChartSeriesCollection>
        <AccumulationChartSeries DataSource="@StatisticsDetails" XName="Browser" YName="Users" Name="Browser">
        </AccumulationChartSeries>
    </AccumulationChartSeriesCollection>
    <AccumulationChartEvents OnLegendItemRender="@LegendRender"></AccumulationChartEvents>
    <AccumulationChartLegendSettings Visible="true" Position="LegendPosition.Top"></AccumulationChartLegendSettings>

</SfAccumulationChart>

@code {

    public class Statistics
    {
        public string Browser { get; set; }
        public double Users { get; set; }
    }

    public List<Statistics> StatisticsDetails = new List<Statistics>
    {
        new Statistics { Browser = "Chrome", Users = 37 },
        new Statistics { Browser = "UC Browser", Users = 17 },
        new Statistics { Browser = "iPhone", Users = 19 },
        new Statistics { Browser = "Others", Users = 4  },
        new Statistics { Browser = "Opera", Users = 11 },
        new Statistics { Browser = "Android", Users = 12 },
    };

    public void LegendRender(AccumulationLegendRenderEventArgs args)
    {
        if(args.Text == "Chrome" || args.Text == "UC Browser")
        {
            args.Fill = "green";
            args.Shape = LegendShape.Diamond;
        }
        if (args.Text == "iPhone" || args.Text == "Android")
        {
            args.Fill = "blue";
            args.Shape = LegendShape.Circle;
        }
        if (args.Text == "Others" || args.Text == "Opera")
        {
            args.Fill = "red";
            args.Shape = LegendShape.InvertedTriangle;
        }
    }
}

The following screenshot illustrates the output of the above code snippet.

Output:

View the sample in GitHub

Conclusion

I hope you enjoyed learning how to customize the individual legend items in Blazor Charts.

You can refer to our Blazor Charts feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our Blazor Charts example to understand how to create and manipulate data.

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