How to add a list of names to tooltip text in Blazor Charts?

This article explains how to add a list of names to tooltip text using an event.

Adding list of names to tooltip text

Blazor Charts provides an option to add list of names to the histogram chart series tooltip text using TooltipRender event. This can be achieved by iterating through list of names using foreach loop and appending each name along with br tag to TooltipRender event Text argument.

The below code example demonstrates how to add list of names to tooltip text.

Index.razor

@using Syncfusion.Blazor.Charts
<SfChart Title="Score of Final Examination">
   <ChartEvents TooltipRender="TooltipEvent"></ChartEvents>
   <ChartArea><ChartAreaBorder Width="0"></ChartAreaBorder></ChartArea>
   <ChartPrimaryXAxis Minimum="0" Maximum="100">
       <ChartAxisMajorGridLines Width="0"></ChartAxisMajorGridLines>
   </ChartPrimaryXAxis>
   <ChartPrimaryYAxis Minimum="0" Maximum="6" Interval="2" Title="Number of Students">
       <ChartAxisMajorGridLines Width="0"></ChartAxisMajorGridLines>
   </ChartPrimaryYAxis>
   <ChartSeriesCollection>
       <ChartSeries DataSource="@ExamScores" YName="Y" Type="Syncfusion.Blazor.Charts.ChartSeriesType.Histogram" BinInterval="20" ShowNormalDistribution="true" ColumnWidth="0.99">
           <ChartMarker Visible="true" Height="10" Width="10">
               <ChartDataLabel Visible="true" Position="Syncfusion.Blazor.Charts.LabelPosition.Top">
                   <ChartDataLabelFont Color="#ffffff" FontWeight="600"></ChartDataLabelFont>
               </ChartDataLabel>
           </ChartMarker>
       </ChartSeries>
   </ChartSeriesCollection>
<ChartTooltipSettings Enable="true">
</ChartTooltipSettings>
</SfChart>
@code{
   public class Data
   {
       public double Y { get; set;}
       public string[] ListOfNames = { "Nelson", "Amir", "Brenda", "Bernard", "Dennis", "Ruben", "Jason", "Lucas", "Caroline", "Denise", "Alexandra" };
   }  
   public List<Data> ExamScores = new List<Data>
   {
      new Data { Y=5.250},
      new Data { Y=7.750},
      new Data { Y=8.275},
      new Data { Y=9.750},
      new Data { Y=36.250},
      new Data { Y=46.250},
      new Data { Y=56.250},
      new Data { Y=66.500},
      new Data { Y=76.625},
      new Data { Y=80.000},
      new Data { Y=97.75}
   };
   public void TooltipEvent(Syncfusion.Blazor.Charts.TooltipRenderEventArgs args)
   {
     args.Text += "<br>";
     foreach(var name in ExamScores[0].ListOfNames)
     {
       args.Text += name + "<br>";
     }
     args.Text += "<br> Count: " + ExamScores[0].ListOfNames.Count();
   }
}

The following screenshot illustrates the output of the code snippet.

Output

Live Sample for Adding List of Names to Tooltip

Conclusion

I hope you enjoyed learning how to add list of name to tooltip text in Blazor Chart Component.

You can refer to our Blazor Chart 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 Chart example to understand how to create and manipulate data.

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