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Tooltip in ASP.NET MVC Bullet Chart control

17 Sep 2021 / 1 minute to read

When the mouse is hovered over a bar in the Bullet Chart, the tooltip displays important summary about the actual and the target bar values.

Default Tooltip

The tooltip is not visible by default. To make it visible, set the enable property in the tooltip to true.

razor
tool-tip.cs
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@Html.EJS().BulletChart("container")
                        .Title("Profit in percentage")
                        .Tooltip(tp => tp.Enable(true))
                        .ValueField("value")
                        .TargetField("comparativeMeasureValue")
                        .CategoryField("category")
                        .Height("400)
                        .LabelFormat("{value}%)
                        .Ranges(rn =>
                        {
                            rn.End(5).Add();
                            rn.End(15).Add();
                            rn.End(20).Add();
                        })
                        .Minimum(0).Maximum(20).Interval(5)
                        .DataSource(ViewBag.dataSource)
                        .Render()
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public IActionResult Index()
        {
            List<DefaultBulletData> bulletData = new List<DefaultBulletData>
            {
                new DefaultBulletData { value = 5, comparativeMeasureValue = 7.5, category= "2001"},
                new DefaultBulletData { value = 7, comparativeMeasureValue = 5, category= "2002"},
                new DefaultBulletData { value = 10, comparativeMeasureValue = 6, category= "2003"},
                new DefaultBulletData { value = 5, comparativeMeasureValue = 8, category= "2004"},
                new DefaultBulletData { value = 12, comparativeMeasureValue = 5, category= "2005"},
                new DefaultBulletData { value = 8, comparativeMeasureValue = 6, category= "2006"}
            };
            ViewBag.dataSource = bulletData;
            return View();
        }
        public class DefaultBulletData
        {           
            public double value;
            public double comparativeMeasureValue;
            public string category;
        }

Bullet Chart displays ToolTip

Tooltip Template

Any HTML elements can be displayed in the tooltip by using the template property of the tooltip. You can use the ${target} and ${value} as place holders in the HTML element to display the value and target values from the data source of corresponding data point.

Tooltip Customization

The following properties can be used to customize the Bullet Chart tooltip.

  • fill - Specifies the color of tooltip.
  • border - Specifies the tooltip border color and width.
  • textStyle - Specifies the tooltip font family, font style, font weight, color and size.