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Legend in Blazor HeatMap Chart component

The legend is used to provide the information about the heat map cell. You can enable the legend by setting the Visible property to true.

@using Syncfusion.Blazor.HeatMap

<SfHeatMap DataSource="@HeatMapData" ShowTooltip="true">
    <HeatMapTitle Text="Sales Revenue per Employee (in 1000 US$)"></HeatMapTitle>
    <HeatMapXAxis Labels="@XAxisLabels"></HeatMapXAxis>
    <HeatMapYAxis Labels="@YAxisLabels"></HeatMapYAxis>
    <HeatMapCellSettings ShowLabel="true" TileType="CellType.Rect"></HeatMapCellSettings>
    <HeatMapPaletteSettings Type="PaletteType.Gradient">
        <HeatMapPalettes>
            <HeatMapPalette Value="0" Color="#C2E7EC"></HeatMapPalette>
            <HeatMapPalette Value="10" Color="#AEDFE6"></HeatMapPalette>
            <HeatMapPalette Value="20" Color="#9AD7E0"></HeatMapPalette>
            <HeatMapPalette Value="30" Color="#72C7D4"></HeatMapPalette>
            <HeatMapPalette Value="40" Color="#5EBFCE"></HeatMapPalette>
            <HeatMapPalette Value="50" Color="#4AB7C8"></HeatMapPalette>
            <HeatMapPalette Value="60" Color="#309DAE"></HeatMapPalette>
            <HeatMapPalette Value="70" Color="#2B8C9B"></HeatMapPalette>
            <HeatMapPalette Value="80" Color="#257A87"></HeatMapPalette>
            <HeatMapPalette Value="90" Color="#15464D"></HeatMapPalette>
            <HeatMapPalette Value="100" Color="#000000"></HeatMapPalette>
        </HeatMapPalettes>
    </HeatMapPaletteSettings>
    <HeatMapLegendSettings Visible="true"></HeatMapLegendSettings>
</SfHeatMap>

@code{
    int[,] GetDefaultData()
    {
        int[,] dataSource = new int[,]
        {
            {73, 39, 26, 39, 94, 0},
            {93, 58, 53, 38, 26, 68},
            {99, 28, 22, 4, 66, 90},
            {14, 26, 97, 69, 69, 3},
            {7, 46, 47, 47, 88, 6},
            {41, 55, 73, 23, 3, 79}
        };
        return dataSource;
    }
    string[] XAxisLabels = new string[] {"Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael" };
    string[] YAxisLabels = new string[] { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
    public object HeatMapData { get; set; }
    protected override void OnInitialized()
    {
        HeatMapData = GetDefaultData();
    }
}

Heatmap Sample

Legend types

Heat map supports two legend types: Gradient and list type.

  • Gradient - This is a continuous color legend with smooth color transition between palette color values.
  • List - List is a fixed color legend. Each palette color information is shown separately in the list item.

You can change the legend type by using the Type property in the HeatMapPaletteSettings property.

@using Syncfusion.Blazor.HeatMap

<SfHeatMap DataSource="@HeatMapData" ShowTooltip="true">
    <HeatMapTitle Text="Sales Revenue per Employee (in 1000 US$)"></HeatMapTitle>
    <HeatMapXAxis Labels="@XAxisLabels"></HeatMapXAxis>
    <HeatMapYAxis Labels="@YAxisLabels"></HeatMapYAxis>
    <HeatMapCellSettings ShowLabel="true" TileType="CellType.Rect"></HeatMapCellSettings>
    <HeatMapPaletteSettings Type="PaletteType.Fixed"></HeatMapPaletteSettings>
    <HeatMapLegendSettings ShowLabel="true"></HeatMapLegendSettings>
</SfHeatMap>

@code{
    int[,] GetDefaultData()
    {
        int[,] dataSource = new int[,]
        {
            {73, 39, 26, 39, 94, 0},
            {93, 58, 53, 38, 26, 68},
            {99, 28, 22, 4, 66, 90},
            {14, 26, 97, 69, 69, 3},
            {7, 46, 47, 47, 88, 6},
            {41, 55, 73, 23, 3, 79}
        };
        return dataSource;
    }
    string[] XAxisLabels = new string[] {"Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael" };
    string[] YAxisLabels = new string[] { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
    public object HeatMapData { get; set; }
    protected override void OnInitialized()
    {
        HeatMapData = GetDefaultData();
    }
}

Heatmap Sample

Placement

You can place the legend at left, right, top, or bottom to the heat map layout by using the Position property. The legend is positioned at the right to the heat map by default.

@using Syncfusion.Blazor.HeatMap

<SfHeatMap DataSource="@HeatMapData" ShowTooltip="true">
    <HeatMapTitle Text="Sales Revenue per Employee (in 1000 US$)"></HeatMapTitle>
    <HeatMapXAxis Labels="@XAxisLabels"></HeatMapXAxis>
    <HeatMapYAxis Labels="@YAxisLabels"></HeatMapYAxis>
    <HeatMapCellSettings ShowLabel="true" TileType="CellType.Rect"></HeatMapCellSettings>
    <HeatMapLegendSettings ShowLabel="true" Position="LegendPosition.Top"></HeatMapLegendSettings>
</SfHeatMap>

@code{
    int[,] GetDefaultData()
    {
        int[,] dataSource = new int[,]
        {
            {73, 39, 26, 39, 94, 0},
            {93, 58, 53, 38, 26, 68},
            {99, 28, 22, 4, 66, 90},
            {14, 26, 97, 69, 69, 3},
            {7, 46, 47, 47, 88, 6},
            {41, 55, 73, 23, 3, 79}
        };
        return dataSource;
    }
    string[] XAxisLabels = new string[] {"Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael" };
    string[] YAxisLabels = new string[] { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
    public object HeatMapData { get; set; }
    protected override void OnInitialized()
    {
        HeatMapData = GetDefaultData();
    }
}

Heatmap Sample

Alignment

You can align the legend as center, far, or near to the heat map using the Alignment property.

@using Syncfusion.Blazor.HeatMap

<SfHeatMap DataSource="@HeatMapData" ShowTooltip="true">
    <HeatMapTitle Text="Sales Revenue per Employee (in 1000 US$)"></HeatMapTitle>
    <HeatMapXAxis Labels="@XAxisLabels"></HeatMapXAxis>
    <HeatMapYAxis Labels="@YAxisLabels"></HeatMapYAxis>
    <HeatMapCellSettings ShowLabel="true" TileType="CellType.Rect"></HeatMapCellSettings>
    <HeatMapLegendSettings ShowLabel="true" Position="LegendPosition.Right" Height="150px" Alignment="Alignment.Center"></HeatMapLegendSettings>
</SfHeatMap>

@code{
    int[,] GetDefaultData()
    {
        int[,] dataSource = new int[,]
        {
            {73, 39, 26, 39, 94, 0},
            {93, 58, 53, 38, 26, 68},
            {99, 28, 22, 4, 66, 90},
            {14, 26, 97, 69, 69, 3},
            {7, 46, 47, 47, 88, 6},
            {41, 55, 73, 23, 3, 79}
        };
        return dataSource;
    }
    string[] XAxisLabels = new string[] {"Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael" };
    string[] YAxisLabels = new string[] { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
    public object HeatMapData { get; set; }
    protected override void OnInitialized()
    {
        HeatMapData = GetDefaultData();
    }
}

Heatmap Sample

Legend dimensions

You can change the legend dimensions with values in pixels or percentage by using theWidth and Height properties.

@using Syncfusion.Blazor.HeatMap

<SfHeatMap DataSource="@HeatMapData" ShowTooltip="true">
    <HeatMapTitle Text="Sales Revenue per Employee (in 1000 US$)"></HeatMapTitle>
    <HeatMapXAxis Labels="@XAxisLabels"></HeatMapXAxis>
    <HeatMapYAxis Labels="@YAxisLabels"></HeatMapYAxis>
    <HeatMapCellSettings ShowLabel="true" TileType="CellType.Rect"></HeatMapCellSettings>
    <HeatMapLegendSettings ShowLabel="true" Position="LegendPosition.Right" Width="200px" Height="150px"></HeatMapLegendSettings>
</SfHeatMap>

@code{
    int[,] GetDefaultData()
    {
        int[,] dataSource = new int[,]
        {
            {73, 39, 26, 39, 94, 0},
            {93, 58, 53, 38, 26, 68},
            {99, 28, 22, 4, 66, 90},
            {14, 26, 97, 69, 69, 3},
            {7, 46, 47, 47, 88, 6},
            {41, 55, 73, 23, 3, 79}
        };
        return dataSource;
    }
    string[] XAxisLabels = new string[] {"Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael" };
    string[] YAxisLabels = new string[] { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
    public object HeatMapData { get; set; }
    protected override void OnInitialized()
    {
        HeatMapData = GetDefaultData();
    }
}

Heatmap Sample

Paging for legend

Paging is available only for the list type legend in the heat map, and it can be enabled by default, when the legend items exceed the legend bounds. You can view each legend items by navigating between the pages using navigation buttons.

@using Syncfusion.Blazor.HeatMap

<SfHeatMap DataSource="@HeatMapData" ShowTooltip="true">
    <HeatMapTitle Text="Sales Revenue per Employee (in 1000 US$)"></HeatMapTitle>
    <HeatMapXAxis Labels="@XAxisLabels"></HeatMapXAxis>
    <HeatMapYAxis Labels="@YAxisLabels"></HeatMapYAxis>
    <HeatMapCellSettings ShowLabel="true" TileType="CellType.Rect"></HeatMapCellSettings>
    <HeatMapPaletteSettings Type="PaletteType.Fixed">
        <HeatMapPalettes>
            <HeatMapPalette Value="0" Color="#C2E7EC"></HeatMapPalette>
            <HeatMapPalette Value="10" Color="#AEDFE6"></HeatMapPalette>
            <HeatMapPalette Value="20" Color="#9AD7E0"></HeatMapPalette>
            <HeatMapPalette Value="30" Color="#72C7D4"></HeatMapPalette>
            <HeatMapPalette Value="40" Color="#5EBFCE"></HeatMapPalette>
            <HeatMapPalette Value="50" Color="#4AB7C8"></HeatMapPalette>
            <HeatMapPalette Value="60" Color="#309DAE"></HeatMapPalette>
            <HeatMapPalette Value="70" Color="#2B8C9B"></HeatMapPalette>
            <HeatMapPalette Value="80" Color="#257A87"></HeatMapPalette>
            <HeatMapPalette Value="90" Color="#15464D"></HeatMapPalette>
            <HeatMapPalette Value="100" Color="#000000"></HeatMapPalette>
        </HeatMapPalettes>
    </HeatMapPaletteSettings>
    <HeatMapLegendSettings ShowLabel="true" Position="LegendPosition.Right" Alignment="Alignment.Center" Height="150px"></HeatMapLegendSettings>
</SfHeatMap>

@code{
    int[,] GetDefaultData()
    {
        int[,] dataSource = new int[,]
        {
            {73, 39, 26, 39, 94, 0},
            {93, 58, 53, 38, 26, 68},
            {99, 28, 22, 4, 66, 90},
            {14, 26, 97, 69, 69, 3},
            {7, 46, 47, 47, 88, 6},
            {41, 55, 73, 23, 3, 79}
        };
        return dataSource;
    }
    string[] XAxisLabels = new string[] {"Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael" };
    string[] YAxisLabels = new string[] { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
    public object HeatMapData { get; set; }
    protected override void OnInitialized()
    {
        HeatMapData = GetDefaultData();
    }
}

Heatmap Sample

Smart Legend

Smart legend is another way of showing list type legend with responsiveness and readability, when the palette has more number of items. You can enable this smart legend by using the EnableSmartLegend property when the palette type is set to Fixed.

In smart legend, you can change the display type of legend labels by using the LabelDisplayType property.

The following are the legend label display types:

  • All: Displays all labels in the legend.
  • Edge: Displays the legend labels only at extreme ends.
  • None: None of the labels are displayed. The tooltip will appear for this type of label display when hovering over the legend item.
@using Syncfusion.Blazor.HeatMap

<SfHeatMap DataSource="@HeatMapData" ShowTooltip="true">
    <HeatMapTitle Text="Sales Revenue per Employee (in 1000 US$)"></HeatMapTitle>
    <HeatMapXAxis Labels="@XAxisLabels"></HeatMapXAxis>
    <HeatMapYAxis Labels="@YAxisLabels"></HeatMapYAxis>
    <HeatMapCellSettings ShowLabel="true" TileType="CellType.Rect"></HeatMapCellSettings>
    <HeatMapPaletteSettings Type="PaletteType.Fixed">
        <HeatMapPalettes>
            <HeatMapPalette Value="0" Color="#C2E7EC"></HeatMapPalette>
            <HeatMapPalette Value="10" Color="#AEDFE6"></HeatMapPalette>
            <HeatMapPalette Value="20" Color="#9AD7E0"></HeatMapPalette>
            <HeatMapPalette Value="30" Color="#72C7D4"></HeatMapPalette>
            <HeatMapPalette Value="40" Color="#5EBFCE"></HeatMapPalette>
            <HeatMapPalette Value="50" Color="#4AB7C8"></HeatMapPalette>
            <HeatMapPalette Value="60" Color="#309DAE"></HeatMapPalette>
            <HeatMapPalette Value="70" Color="#2B8C9B"></HeatMapPalette>
            <HeatMapPalette Value="80" Color="#257A87"></HeatMapPalette>
            <HeatMapPalette Value="90" Color="#15464D"></HeatMapPalette>
            <HeatMapPalette Value="100" Color="#000000"></HeatMapPalette>
        </HeatMapPalettes>
    </HeatMapPaletteSettings>
    <HeatMapLegendSettings ShowLabel="true" Position="LegendPosition.Right" EnableSmartLegend="true" Alignment="Alignment.Center"></HeatMapLegendSettings>
</SfHeatMap>

@code{
    int[,] GetDefaultData()
    {
        int[,] dataSource = new int[,]
        {
            {73, 39, 26, 39, 94, 0},
            {93, 58, 53, 38, 26, 68},
            {99, 28, 22, 4, 66, 90},
            {14, 26, 97, 69, 69, 3},
            {7, 46, 47, 47, 88, 6},
            {41, 55, 73, 23, 3, 79}
        };
        return dataSource;
    }
    string[] XAxisLabels = new string[] {"Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael" };
    string[] YAxisLabels = new string[] { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
    public object HeatMapData { get; set; }
    protected override void OnInitialized()
    {
        HeatMapData = GetDefaultData();
    }
}

Heatmap Sample

Legend Selection

In the HeatMap, the legend selection is used to toggle the visibility of cell for viewing the specific range value. You can enable the legend selection using the ToggleVisibility property.

@using Syncfusion.Blazor.HeatMap

<SfHeatMap DataSource="@HeatMapData" ShowTooltip="true">
    <HeatMapTitle Text="Sales Revenue per Employee (in 1000 US$)"></HeatMapTitle>
    <HeatMapXAxis Labels="@XAxisLabels"></HeatMapXAxis>
    <HeatMapYAxis Labels="@YAxisLabels"></HeatMapYAxis>
    <HeatMapCellSettings ShowLabel="true" TileType="CellType.Rect"></HeatMapCellSettings>
    <HeatMapPaletteSettings Type="PaletteType.Fixed">
        <HeatMapPalettes>
            <HeatMapPalette Value="0" Color="#C2E7EC"></HeatMapPalette>
            <HeatMapPalette Value="10" Color="#AEDFE6"></HeatMapPalette>
            <HeatMapPalette Value="20" Color="#9AD7E0"></HeatMapPalette>
            <HeatMapPalette Value="30" Color="#72C7D4"></HeatMapPalette>
            <HeatMapPalette Value="40" Color="#5EBFCE"></HeatMapPalette>
            <HeatMapPalette Value="50" Color="#4AB7C8"></HeatMapPalette>
            <HeatMapPalette Value="60" Color="#309DAE"></HeatMapPalette>
            <HeatMapPalette Value="70" Color="#2B8C9B"></HeatMapPalette>
            <HeatMapPalette Value="80" Color="#257A87"></HeatMapPalette>
            <HeatMapPalette Value="90" Color="#15464D"></HeatMapPalette>
            <HeatMapPalette Value="100" Color="#000000"></HeatMapPalette>
        </HeatMapPalettes>
    </HeatMapPaletteSettings>
    <HeatMapLegendSettings ShowLabel="true" Position="LegendPosition.Right" EnableSmartLegend="true" ToggleVisibility="true"></HeatMapLegendSettings>
</SfHeatMap>

@code{
    int[,] GetDefaultData()
    {
        int[,] dataSource = new int[,]
        {
            {73, 39, 26, 39, 94, 0},
            {93, 58, 53, 38, 26, 68},
            {99, 28, 22, 4, 66, 90},
            {14, 26, 97, 69, 69, 3},
            {7, 46, 47, 47, 88, 6},
            {41, 55, 73, 23, 3, 79}
        };
        return dataSource;
    }
    string[] XAxisLabels = new string[] {"Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael"};
    string[] YAxisLabels = new string[] { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
    public object HeatMapData { get; set; }
    protected override void OnInitialized()
    {
        HeatMapData = GetDefaultData();
    }
}

Heatmap Sample

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