DxSparkline.Rendered Event

Fires after the Sparkline is rendered.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v25.1.dll

NuGet Package: DevExpress.Blazor

Declaration

[Parameter]
public EventCallback Rendered { get; set; }

Remarks

Handle the Rendered event to track the moment when sparkline rendering is finished and the component is completely loaded.

The following code snippet displays a custom Export to PDF button that exports component data to a PDF file. The button appears after the Sparkline is completely loaded. For demo purposes, the example imitates a time-consuming operation.

Razor

<DxSparkline Data="@DataSource"
             @ref=@Sparkline
             ArgumentFieldName="Month"
             ValueFieldName="VisitorCount"
             Rendered="@SparklineRendered"
             Height="50px"
             Width="200px">
</DxSparkline>

<DxButton Text="Export to PDF" Visible="@buttonVisible" Click="ExportToPdf" />

@code {
    bool buttonVisible;
    DxSparkline Sparkline;

    IEnumerable<SparklineDataPoint> DataSource = Enumerable.Empty<SparklineDataPoint>();
    protected override void OnInitialized() {
        DataSource = GenerateData();
    }

    async Task SparklineRendered() {
        await Task.Delay(2000);
        buttonVisible = true;
    }
    async Task ExportToPdf () {
        await Sparkline.ExportToAsync("Custom file", DataExportFormat.Pdf);
    }
}

DataSource

public List<SparklineDataPoint> GenerateData() {
    return new List<SparklineDataPoint>() {
            new SparklineDataPoint( 01, 2132),
            new SparklineDataPoint( 02, 2103),
            new SparklineDataPoint( 03, 2210),
            new SparklineDataPoint( 04, 2152),
            new SparklineDataPoint( 05, 2062),
            new SparklineDataPoint( 06, 1954),
            new SparklineDataPoint( 07, 2112),
            new SparklineDataPoint( 08, 1967),
            new SparklineDataPoint( 09, 2009),
            new SparklineDataPoint( 10, 2087),
            new SparklineDataPoint( 11, 2112),
            new SparklineDataPoint( 12, 2038),
        };
}
public class SparklineDataPoint {
    public int Month { get; set; }
    public int? VisitorCount { get; set; }
    public SparklineDataPoint(int month, int? visitorCount) {
        Month = month;
        VisitorCount = visitorCount;
    }
}