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How to customize the Crosshair Label Text dynamically?

Platform: ASP.NET MVC |
Control: Chart |
Published Date: May 23, 2015 |
Last Revised Date: July 1, 2019

Essential Chart supports customization of the crosshair axis label dynamically in TrackAxisToolTip event. Refer to the Chart Events for more information about events available in Chart. Refer to the TrackAxisToolTip  for more information about the argument available in event handler for TrackAxisToolTip event.

The event handler provides an object as an argument that contains the properties like cancel, data, model and type. The crosshair label text can be customized by using currentText property of data in the parameter object.

CSHTML

@(Html.EJ().Chart("container")
    .TrackAxisToolTip("crosshairLabel")
    .PrimaryXAxis(axis=>axis.CrosshairLabel(label=>label.Visible(true)))
    .PrimaryYAxis(axis=>axis.CrosshairLabel(label=>label.Visible(true)))
    .Crosshair(crosshair=>
        crosshair.Visible(true))
    .CommonSeriesOptions(options=>
        options.Type(SeriesType.Line)
            .DashArray("5,5")
            )
)
<script type="text/javascript">
    //Event handler for crosshair label text
    function crosshairLabel(sender) {
        if (sender.data.chartAxis.orientation == 'vertical')
            sender.data.currentTrackText = 'Price: $ ' + sender.data.currentTrackText;
    }
</script>

 

The following screenshot displays the chart with customized crosshair label text.

Customized the Crosshair Label Text dynamically

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