Tooltip in Blazor Chart component

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08 Apr 2021 / 2 minutes to read

Chart will display details about the points through tooltip, when the mouse is moved over the point.

The tooltip is useful when you cannot display information by using the data labels due to space constraints. You can enable tooltip by setting the Enable property as true in ChartTooltipSettings.

default.razor

@using Syncfusion.Blazor.Charts

<SfChart>
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category"></ChartPrimaryXAxis>

    <ChartTooltipSettings Enable="true"></ChartTooltipSettings>

    <ChartSeriesCollection>
        <ChartSeries DataSource="@MedalDetails" XName="X" YName="YValue" Type="ChartSeriesType.Column">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{

    public class ChartData
    {
        public string X { get; set; }
        public double YValue { get; set; }
    }

    public List<ChartData> MedalDetails = new List<ChartData>
    {
        new ChartData { X= "USA", YValue= 46 },
        new ChartData { X= "GBR", YValue= 27 },
        new ChartData { X= "CHN", YValue= 26 },
        new ChartData { X= "UK", YValue= 26 },
        new ChartData { X= "AUS", YValue= 26 },
        new ChartData { X= "IND", YValue= 26 },
        new ChartData { X= "DEN", YValue= 26 },
        new ChartData { X= "MEX", YValue= 26 },
    };
}

Enable Tooltip

By default, tooltip shows information of x and y value in points. In addition to that, you can show more information in tooltip. For example the format ’${series.name} ${point.x}’ shows series name and point x value.

format.razor

@using Syncfusion.Blazor.Charts

<SfChart Title="AAPL - 2012-2017">
    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.Category"></ChartPrimaryXAxis>

    <ChartTooltipSettings Enable="true" Header="Unemployment" Format="<b>${point.x} : ${point.y}</b>"></ChartTooltipSettings>

    <ChartSeriesCollection>
        <ChartSeries DataSource="@MedalDetails" XName="X" YName="YValue" Type="ChartSeriesType.Column">
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{

    public class ChartData
    {
        public string X { get; set; }
        public double YValue { get; set; }
    }

    public List<ChartData> MedalDetails = new List<ChartData>
    {
        new ChartData { X= "USA", YValue= 46 },
        new ChartData { X= "GBR", YValue= 27 },
        new ChartData { X= "CHN", YValue= 26 },
        new ChartData { X= "UK", YValue= 26 },
        new ChartData { X= "AUS", YValue= 26 },
        new ChartData { X= "IND", YValue= 26 },
        new ChartData { X= "DEN", YValue= 26 },
        new ChartData { X= "MEX", YValue= 26 },
    };
}

Format the Tooltip

The Fill and Border properties are used to customize the background color and border of the tooltip respectively. The TextStyle property in the tooltip is used to customize tooltip text.

appearance.razor

@using Syncfusion.Blazor.Charts

<SfChart Title="Inflation - Consumer Price">
    <ChartArea><ChartAreaBorder Width="0"></ChartAreaBorder></ChartArea>

    <ChartPrimaryXAxis ValueType="Syncfusion.Blazor.Charts.ValueType.DateTime" LabelFormat="yyyy" IntervalType="IntervalType.Years" EdgeLabelPlacement="EdgeLabelPlacement.Shift">
        <ChartAxisMajorGridLines Width="0"></ChartAxisMajorGridLines>
    </ChartPrimaryXAxis>

    <ChartPrimaryYAxis LabelFormat="{value}%" RangePadding="ChartRangePadding.None" Minimum="0" Maximum="100" Interval="20">
        <ChartAxisLineStyle Width="0"></ChartAxisLineStyle>
        <ChartAxisMajorTickLines Width="0"></ChartAxisMajorTickLines>
    </ChartPrimaryYAxis>

    <ChartTooltipSettings Enable="true" Fill="blue" Format="${series.name} ${point.x} : ${point.y}">
    </ChartTooltipSettings>

    <ChartSeriesCollection>
        <ChartSeries DataSource="@ConsumerDetails" XName="XValue" YName="YValue" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Width="10" Height="10">
            </ChartMarker>
        </ChartSeries>
        <ChartSeries DataSource="@ConsumerDetails" XName="XValue" YName="YValue1" Type="ChartSeriesType.Line">
            <ChartMarker Visible="true" Width="10" Height="10">
            </ChartMarker>
        </ChartSeries>
    </ChartSeriesCollection>
</SfChart>

@code{

    public class ChartData
    {
        public DateTime XValue { get; set; }
        public double YValue { get; set; }
        public double YValue1 { get; set; }
    }
    public List<ChartData> ConsumerDetails = new List<ChartData>
    {
        new ChartData { XValue = new DateTime(2005, 01, 01), YValue = 21, YValue1 = 28 },
        new ChartData { XValue = new DateTime(2006, 01, 01), YValue = 24, YValue1 = 44 },
        new ChartData { XValue = new DateTime(2007, 01, 01), YValue = 36, YValue1 = 48 },
        new ChartData { XValue = new DateTime(2008, 01, 01), YValue = 38, YValue1 = 50 },
        new ChartData { XValue = new DateTime(2009, 01, 01), YValue = 54, YValue1 = 66 },
        new ChartData { XValue = new DateTime(2010, 01, 01), YValue = 57, YValue1 = 78 },
        new ChartData { XValue = new DateTime(2011, 01, 01), YValue = 70, YValue1 = 84 },
    };
}

Customize the Appearance of Tooltip

Note: You can refer to our Blazor Charts feature tour page for its groundbreaking feature representations. You can also explore our Blazor Chart example to knows various chart types and how to represent time-dependent data, showing trends in data at equal intervals.

Tooltip in Blazor Chart component

Enable Tooltip

Format the Tooltip

Customize the Appearance of Tooltip

See Also