How to perform zooming programmatically in Blazor Charts?

This article explains how to perform zooming programmatically in Blazor Charts.

Perform zooming programmatically

Blazor Charts provides an option to perform zooming programmatically using ZoomFactor property.

This can be achieved by setting and resetting the zoom level through adjusting the ZoomFactor value in ChartPrimaryXAxis and ChartPrimaryYAxis. For example, you can dynamically perform ZoomIn, ZoomOut, and Reset by clicking external buttons.

The below code example demonstrates how to perform zooming programmatically in chart.

Index.razor

@using Syncfusion.Blazor.Charts
@using Syncfusion.Blazor.Buttons

<SfButton @onclick="ZoomIn" IsToggle="true" IsPrimary="true" Content="ZoomIn"></SfButton>
<SfButton @onclick="ZoomOut" IsToggle="true" IsPrimary="true" Content="ZoomOut"></SfButton>
<SfButton @onclick="ResetZoom" IsToggle="true" IsPrimary="true" Content="ResetZoom"></SfButton>

<SfChart>
   <ChartPrimaryXAxis ZoomFactor ="@SetZoomFactor" ValueType="Syncfusion.Blazor.Charts.ValueType.Category" />
   <ChartPrimaryYAxis ZoomFactor="@SetZoomFactor" />
   <ChartSeriesCollection>
       <ChartSeries DataSource="@MedalDetails" XName="X" YName="Y" Type="Syncfusion.Blazor.Charts.ChartSeriesType.Column">
       </ChartSeries>
   </ChartSeriesCollection>
</SfChart>

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

   public double SetZoomFactor = 1;

   public List<ChartData> MedalDetails = new List<ChartData>
   {
       new ChartData { X= "South Korea", Y= 39.4 },
       new ChartData { X= "India", Y= 61.3 },
       new ChartData { X= "Pakistan", Y= 20.4 },
       new ChartData { X= "Germany", Y= 65.1 },
       new ChartData { X= "Australia", Y= 15.8 },
       new ChartData { X= "Italy", Y= 29.2 },
       new ChartData { X= "United Kingdom", Y= 44.6 },
       new ChartData { X= "Saudi Arabia", Y= 9.7 },
       new ChartData { X= "Russia", Y= 40.8 },
       new ChartData { X= "Mexico", Y= 31 },
       new ChartData { X= "Brazil", Y= 75.9 },
       new ChartData { X= "China", Y= 51.4 }
   };

   public void ZoomIn()
   {
       SetZoomFactor -= 0.1;
   }

   public void ZoomOut()
   {
       SetZoomFactor += 0.1;
   }

   public void ResetZoom()
   {
       SetZoomFactor = 1;
   }
}

The following screenshot illustrates the output of the code snippet.

Output

Live Sample for Dynamic Zooming

Conclusion

I hope you enjoyed learning how to perform zooming programmatically 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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