Tooltip for Telerik Blazor Stock Chart

The Telerik Stock Chart provides a tooltip for its data points. You can have settings specific to each <StockChartSeries>, common tooltip settings for all series, or a shared tooltip for all categories.

In this article:

Basics

By default the value of the point will be presented when hovered over.

By default the tooltip for the data points of the Stock Chart are enabled.

To setup tooltips for the data points of each individual series:

  1. Inside the <StockChartSeries>, include the <StockChartSeriesTooltip> tag.
  2. Set its Visible parameter to true or false.

Disable the tooltip for a specific series and leave the rest enabled

@* Disable the tooltip for a specific Chart Series *@

<TelerikStockChart Width="750px"
                   Height="450px"
                   DateField="@nameof(StockDataPoint.Date)">

    <StockChartCategoryAxes>
        <StockChartCategoryAxis BaseUnit="@ChartCategoryAxisBaseUnit.Months"></StockChartCategoryAxis>
    </StockChartCategoryAxes>

    <StockChartSeriesItems>
        <StockChartSeries Type="StockChartSeriesType.Candlestick"
                          Name="Product 1"
                          Data="@StockChartProduct1Data"
                          OpenField="@nameof(StockDataPoint.Open)"
                          CloseField="@nameof(StockDataPoint.Close)"
                          HighField="@nameof(StockDataPoint.High)"
                          LowField="@nameof(StockDataPoint.Low)">
        </StockChartSeries>

        <StockChartSeries Type="StockChartSeriesType.Candlestick"
                          Name="Product 2"
                          Data="@StockChartProduct2Data"
                          OpenField="@nameof(StockDataPoint.Open)"
                          CloseField="@nameof(StockDataPoint.Close)"
                          HighField="@nameof(StockDataPoint.High)"
                          LowField="@nameof(StockDataPoint.Low)">
            <StockChartSeriesTooltip Visible="false"></StockChartSeriesTooltip>
        </StockChartSeries>
    </StockChartSeriesItems>

    <StockChartNavigator>
        <StockChartNavigatorSeriesItems>
            <StockChartNavigatorSeries Type="StockChartSeriesType.Line"
                                       Name="Product 1"
                                       Data="@StockChartProduct1Data"
                                       Field="@(nameof(StockDataPoint.High))"
                                       CategoryField="@(nameof(StockDataPoint.Date))">
            </StockChartNavigatorSeries>
        </StockChartNavigatorSeriesItems>
    </StockChartNavigator>

</TelerikStockChart>


@code {
    public List<StockDataPoint> StockChartProduct1Data { get; set; }
    public List<StockDataPoint> StockChartProduct2Data { get; set; }

    protected override async Task OnInitializedAsync()
    {
        await GenerateChartData();
    }

    public async Task GenerateChartData()
    {
        StockChartProduct1Data = new List<StockDataPoint>()
        {
            new StockDataPoint(new DateTime(2019, 1, 1), 41.62m, 40.12m, 41.69m, 39.81m, 2632000),
            new StockDataPoint(new DateTime(2019, 2, 1), 39.88m, 40.12m, 41.12m, 39.75m, 3584700),
            new StockDataPoint(new DateTime(2019, 3, 1), 42m, 42.62m, 43.31m, 41.38m, 7631700),
            new StockDataPoint(new DateTime(2019, 4, 1), 42.25m, 43.06m, 43.31m, 41.12m, 4922200)
        };

        StockChartProduct2Data = new List<StockDataPoint>()
        {
            new StockDataPoint(new DateTime(2019, 1, 1), 39m, 38m, 44m, 37m, 26320),
            new StockDataPoint(new DateTime(2019, 2, 1), 37m, 38m, 41m, 40m, 35847),
            new StockDataPoint(new DateTime(2019, 3, 1), 42m, 43m, 45m, 41m, 76317),
            new StockDataPoint(new DateTime(2019, 4, 1), 40m, 42m, 43m, 42m, 49222)
        };

        await Task.FromResult(StockChartProduct1Data);
        await Task.FromResult(StockChartProduct2Data);
    }

    public class StockDataPoint
    {
        public StockDataPoint() { }

        public StockDataPoint(DateTime date, decimal open, decimal close, decimal high, decimal low, int volume)
        {
            Date = date;
            Open = open;
            Close = close;
            High = high;
            Low = low;
            Volume = volume;
        }
        public DateTime Date { get; set; }

        public decimal Open { get; set; }

        public decimal Close { get; set; }

        public decimal High { get; set; }

        public decimal Low { get; set; }

        public int Volume { get; set; }
    }
}

The result from the code snippet above

setup stockchart series tooltip

Common Tooltip

The Chart allows you to enable and define common tooltip settings for all series at once. It looks like the individual tooltips (the value of the point will be presented when hovered over), but you declare it only once.

A tooltip set to a specific <StockChartSeries> will take precedence over the common tooltip settings.

To enable the same tooltip for all series:

  1. Inside the <TelerikStockChart>, add the <StockChartTooltip>.
  2. Set its Visible parameter to true.

Set a Common Tooltip for all series at once

@* This example shows you how to create a common tooltip for all data points *@

<TelerikStockChart Width="750px"
                   Height="450px"
                   DateField="@nameof(StockDataPoint.Date)">

    <StockChartTooltip Visible="true"></StockChartTooltip>

    <StockChartCategoryAxes>
        <StockChartCategoryAxis BaseUnit="@ChartCategoryAxisBaseUnit.Months"></StockChartCategoryAxis>
    </StockChartCategoryAxes>

    <StockChartSeriesItems>
        <StockChartSeries Type="StockChartSeriesType.Candlestick"
                          Name="Product 1"
                          Data="@StockChartProduct1Data"
                          OpenField="@nameof(StockDataPoint.Open)"
                          CloseField="@nameof(StockDataPoint.Close)"
                          HighField="@nameof(StockDataPoint.High)"
                          LowField="@nameof(StockDataPoint.Low)">
        </StockChartSeries>

        <StockChartSeries Type="StockChartSeriesType.Candlestick"
                          Name="Product 2"
                          Data="@StockChartProduct2Data"
                          OpenField="@nameof(StockDataPoint.Open)"
                          CloseField="@nameof(StockDataPoint.Close)"
                          HighField="@nameof(StockDataPoint.High)"
                          LowField="@nameof(StockDataPoint.Low)">
        </StockChartSeries>
    </StockChartSeriesItems>

    <StockChartNavigator>
        <StockChartNavigatorSeriesItems>
            <StockChartNavigatorSeries Type="StockChartSeriesType.Line"
                                       Name="Product 1"
                                       Data="@StockChartProduct1Data"
                                       Field="@(nameof(StockDataPoint.High))"
                                       CategoryField="@(nameof(StockDataPoint.Date))">
            </StockChartNavigatorSeries>
        </StockChartNavigatorSeriesItems>
    </StockChartNavigator>

</TelerikStockChart>


@code {
    public List<StockDataPoint> StockChartProduct1Data { get; set; }
    public List<StockDataPoint> StockChartProduct2Data { get; set; }

    protected override async Task OnInitializedAsync()
    {
        await GenerateChartData();
    }

    public async Task GenerateChartData()
    {
        StockChartProduct1Data = new List<StockDataPoint>()
        {
            new StockDataPoint(new DateTime(2019, 1, 1), 41.62m, 40.12m, 41.69m, 39.81m, 2632000),
            new StockDataPoint(new DateTime(2019, 2, 1), 39.88m, 40.12m, 41.12m, 39.75m, 3584700),
            new StockDataPoint(new DateTime(2019, 3, 1), 42m, 42.62m, 43.31m, 41.38m, 7631700),
            new StockDataPoint(new DateTime(2019, 4, 1), 42.25m, 43.06m, 43.31m, 41.12m, 4922200)
        };

        StockChartProduct2Data = new List<StockDataPoint>()
        {
            new StockDataPoint(new DateTime(2019, 1, 1), 39m, 38m, 44m, 37m, 26320),
            new StockDataPoint(new DateTime(2019, 2, 1), 37m, 38m, 41m, 40m, 35847),
            new StockDataPoint(new DateTime(2019, 3, 1), 42m, 43m, 45m, 41m, 76317),
            new StockDataPoint(new DateTime(2019, 4, 1), 40m, 42m, 43m, 42m, 49222)
        };

        await Task.FromResult(StockChartProduct1Data);
        await Task.FromResult(StockChartProduct2Data);
    }

    public class StockDataPoint
    {
        public StockDataPoint() { }

        public StockDataPoint(DateTime date, decimal open, decimal close, decimal high, decimal low, int volume)
        {
            Date = date;
            Open = open;
            Close = close;
            High = high;
            Low = low;
            Volume = volume;
        }
        public DateTime Date { get; set; }

        public decimal Open { get; set; }

        public decimal Close { get; set; }

        public decimal High { get; set; }

        public decimal Low { get; set; }

        public int Volume { get; set; }
    }
}

The result from the code snippet above

common tooltip settings for all series

Customization

There are two types of customizations you can do for the tooltips:

  • Parameter Settings - lets you alter cosmetic settings such as borders, colors and padding through simple parameters
  • Template - lets you control the entire content

Parameter Settings

You can customize the appearance of the individual series tooltip by using:

  • Background - control the background color by applying a CSS color string, including HEX and RGB. By default the it will match the color for the category.

  • Color - control the text color by applying a CSS color string, including HEX and RGB.

  • Use the Template to take control over what is rendered in the tooltip.

Configuration of the tooltips with applied customization settings

@* This example shows how to customize the tooltip using the Parameter Settings *@

<TelerikStockChart Width="750px"
                   Height="450px"
                   DateField="@nameof(StockDataPoint.Date)">

    <StockChartCategoryAxes>
        <StockChartCategoryAxis BaseUnit="@ChartCategoryAxisBaseUnit.Months"></StockChartCategoryAxis>
    </StockChartCategoryAxes>

    <StockChartSeriesItems>
        <StockChartSeries Type="StockChartSeriesType.Candlestick"
                          Name="Product 1"
                          Data="@StockChartProduct1Data"
                          OpenField="@nameof(StockDataPoint.Open)"
                          CloseField="@nameof(StockDataPoint.Close)"
                          HighField="@nameof(StockDataPoint.High)"
                          LowField="@nameof(StockDataPoint.Low)">
            <StockChartSeriesTooltip Visible="true"
                                     Background="#6495ED"
                                     Color="#F0F8FF"></StockChartSeriesTooltip>
        </StockChartSeries>

        <StockChartSeries Type="StockChartSeriesType.Candlestick"
                          Name="Product 2"
                          Data="@StockChartProduct2Data"
                          OpenField="@nameof(StockDataPoint.Open)"
                          CloseField="@nameof(StockDataPoint.Close)"
                          HighField="@nameof(StockDataPoint.High)"
                          LowField="@nameof(StockDataPoint.Low)">
        </StockChartSeries>
    </StockChartSeriesItems>

    <StockChartNavigator>
        <StockChartNavigatorSeriesItems>
            <StockChartNavigatorSeries Type="StockChartSeriesType.Line"
                                       Name="Product 1"
                                       Data="@StockChartProduct1Data"
                                       Field="@(nameof(StockDataPoint.High))"
                                       CategoryField="@(nameof(StockDataPoint.Date))">
            </StockChartNavigatorSeries>
        </StockChartNavigatorSeriesItems>
    </StockChartNavigator>

</TelerikStockChart>


@code {
    public List<StockDataPoint> StockChartProduct1Data { get; set; }
    public List<StockDataPoint> StockChartProduct2Data { get; set; }

    protected override async Task OnInitializedAsync()
    {
        await GenerateChartData();
    }

    public async Task GenerateChartData()
    {
        StockChartProduct1Data = new List<StockDataPoint>()
        {
            new StockDataPoint(new DateTime(2019, 1, 1), 41.62m, 40.12m, 41.69m, 39.81m, 2632000),
            new StockDataPoint(new DateTime(2019, 2, 1), 39.88m, 40.12m, 41.12m, 39.75m, 3584700),
            new StockDataPoint(new DateTime(2019, 3, 1), 42m, 42.62m, 43.31m, 41.38m, 7631700),
            new StockDataPoint(new DateTime(2019, 4, 1), 42.25m, 43.06m, 43.31m, 41.12m, 4922200)
        };

        StockChartProduct2Data = new List<StockDataPoint>()
        {
            new StockDataPoint(new DateTime(2019, 1, 1), 39m, 38m, 44m, 37m, 26320),
            new StockDataPoint(new DateTime(2019, 2, 1), 37m, 38m, 41m, 40m, 35847),
            new StockDataPoint(new DateTime(2019, 3, 1), 42m, 43m, 45m, 41m, 76317),
            new StockDataPoint(new DateTime(2019, 4, 1), 40m, 42m, 43m, 42m, 49222)
        };

        await Task.FromResult(StockChartProduct1Data);
        await Task.FromResult(StockChartProduct2Data);
    }

    public class StockDataPoint
    {
        public StockDataPoint() { }

        public StockDataPoint(DateTime date, decimal open, decimal close, decimal high, decimal low, int volume)
        {
            Date = date;
            Open = open;
            Close = close;
            High = high;
            Low = low;
            Volume = volume;
        }
        public DateTime Date { get; set; }

        public decimal Open { get; set; }

        public decimal Close { get; set; }

        public decimal High { get; set; }

        public decimal Low { get; set; }

        public int Volume { get; set; }
    }
}

The result from the code snippet above

tooltip parameter customization example

Common Tooltip Settings

In a similar fashion, you can declare these settings in the common tooltip section:

  • Background - control the background color by applying a CSS color string, including HEX and RGB. By default the it will match the color for the category.

  • Color - control the text color by applying a CSS color string, including HEX and RGB.

  • Use the Template to take control over what is rendered in the tooltip - the tag name and data it provides is the same as for the specific tooltip, but it affects all series at once.

Template

The Template allows you to take control over the rendering of the tooltip and include additional information to the user.

In the template you can:

  • Use business logic and render HTML

  • Use the context parameter that provides information about the current data point.

The available series data point information in the context is:

  • DataItem - provides the data model of the current series item. You need to cast it to the type from your data source, which needs to be serializable.

    • For OHLC and Candlestick chart types the DataItem will contain the information mapped to the OpenField, CloseField, HighField and LowField properties.
    • For Line, Area and Column the DataItem will contain the information mapped to the Field properties.
    • The DataItem will contain an aggregated value for the date, so in order to get it you can use the Category and parse it to DateTime.
  • Category - provides information on the category the data point is located in. Since the Stock Chart has a date X axis the Category should be cast to DateTime.

  • SeriesIndex - provides the index of the <StockChartSeries> the data point belongs to.

  • Percentage - for the Stock Chart the value will always be 0.

  • SeriesName - bound to the Name parameter of the <StockChartSeries> the data point belongs to.

  • SeriesColor - shows the RGB color of the Series the data point belongs to.

  • CategoryIndex - shows the index of the data point's x-axis category.

Use the Tooltip Template and use the DataItem to get the value of the point and add additional information

@* This example shows how to use the Template to provide an Icon and additional information from the model *@

<TelerikStockChart Width="750px"
                   Height="450px"
                   DateField="@nameof(StockDataPoint.Date)">

    <StockChartCategoryAxes>
        <StockChartCategoryAxis BaseUnit="@ChartCategoryAxisBaseUnit.Months"></StockChartCategoryAxis>
    </StockChartCategoryAxes>

    <StockChartSeriesItems>
        <StockChartSeries Type="StockChartSeriesType.Candlestick"
                          Name="Product 1"
                          Data="@StockChartProduct1Data"
                          OpenField="@nameof(StockDataPoint.Open)"
                          CloseField="@nameof(StockDataPoint.Close)"
                          HighField="@nameof(StockDataPoint.High)"
                          LowField="@nameof(StockDataPoint.Low)">
            <StockChartSeriesTooltip Visible="true">
                <Template>
                    <TelerikIcon Icon="@IconName.Information" />
                    The high value for @context.SeriesName is @(((context.DataItem as StockDataPoint).High).ToString("C2"))
                </Template>
            </StockChartSeriesTooltip>
        </StockChartSeries>

        <StockChartSeries Type="StockChartSeriesType.Candlestick"
                          Name="Product 2"
                          Data="@StockChartProduct2Data"
                          OpenField="@nameof(StockDataPoint.Open)"
                          CloseField="@nameof(StockDataPoint.Close)"
                          HighField="@nameof(StockDataPoint.High)"
                          LowField="@nameof(StockDataPoint.Low)">
        </StockChartSeries>
    </StockChartSeriesItems>

    <StockChartNavigator>
        <StockChartNavigatorSeriesItems>
            <StockChartNavigatorSeries Type="StockChartSeriesType.Line"
                                       Name="Product 1"
                                       Data="@StockChartProduct1Data"
                                       Field="@(nameof(StockDataPoint.High))"
                                       CategoryField="@(nameof(StockDataPoint.Date))">
            </StockChartNavigatorSeries>
        </StockChartNavigatorSeriesItems>
    </StockChartNavigator>

</TelerikStockChart>


@code {
    public List<StockDataPoint> StockChartProduct1Data { get; set; }
    public List<StockDataPoint> StockChartProduct2Data { get; set; }

    protected override async Task OnInitializedAsync()
    {
        await GenerateChartData();
    }

    public async Task GenerateChartData()
    {
        StockChartProduct1Data = new List<StockDataPoint>()
        {
            new StockDataPoint(new DateTime(2019, 1, 1), 41.62m, 40.12m, 41.69m, 39.81m, 2632000),
            new StockDataPoint(new DateTime(2019, 2, 1), 39.88m, 40.12m, 41.12m, 39.75m, 3584700),
            new StockDataPoint(new DateTime(2019, 3, 1), 42m, 42.62m, 43.31m, 41.38m, 7631700),
            new StockDataPoint(new DateTime(2019, 4, 1), 42.25m, 43.06m, 43.31m, 41.12m, 4922200)
        };

        StockChartProduct2Data = new List<StockDataPoint>()
        {
            new StockDataPoint(new DateTime(2019, 1, 1), 39m, 38m, 44m, 37m, 26320),
            new StockDataPoint(new DateTime(2019, 2, 1), 37m, 38m, 41m, 40m, 35847),
            new StockDataPoint(new DateTime(2019, 3, 1), 42m, 43m, 45m, 41m, 76317),
            new StockDataPoint(new DateTime(2019, 4, 1), 40m, 42m, 43m, 42m, 49222)
        };

        await Task.FromResult(StockChartProduct1Data);
        await Task.FromResult(StockChartProduct2Data);
    }

    public class StockDataPoint
    {
        public StockDataPoint() { }

        public StockDataPoint(DateTime date, decimal open, decimal close, decimal high, decimal low, int volume)
        {
            Date = date;
            Open = open;
            Close = close;
            High = high;
            Low = low;
            Volume = volume;
        }
        public DateTime Date { get; set; }

        public decimal Open { get; set; }

        public decimal Close { get; set; }

        public decimal High { get; set; }

        public decimal Low { get; set; }

        public int Volume { get; set; }
    }
}

The result from the code snippet above

tooltip template example

See Also

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