ASP.NET MVC

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Legend in ASP.NET MVC HeatMap control

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.

razor

default.cs

@using Syncfusion.EJ2;
@Html.EJS().HeatMap("container").TitleSettings(ts => 
ts.Text("Sales Revenue per Employee (in 1000 US$)").TextStyle(ViewBag.textStyle)).XAxis(xAxis =>
xAxis.Labels(ViewBag.xLabels)).YAxis(yaxis =>
yaxis.Labels(ViewBag.yLabels)).PaletteSettings(ps => ps.Palette(palette =>
{
    palette.Value(0).Color("#C2E7EC").Add();
    palette.Value(10).Color("#AEDFE6").Add();
    palette.Value(20).Color("#9AD7E0").Add();
    palette.Value(30).Color("#72C7D4").Add();
    palette.Value(40).Color("#5EBFCE").Add();
    palette.Value(50).Color("#4AB7C8").Add();
    palette.Value(60).Color("#309DAE").Add();
    palette.Value(70).Color("#2B8C9B").Add();
    palette.Value(80).Color("#206974").Add();
    palette.Value(90).Color("#15464D").Add();
    palette.Value(100).Color("#000000").Add();
})).LegendSettings(ls =>
ls.Position(Syncfusion.EJ2.HeatMap.LegendPosition.Right)).DataSource(ViewBag.dataSource).Render()

public ActionResult Legend()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
         };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = 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},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

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 paletteSettings property.

razor

types.cs

@using Syncfusion.EJ2;
@Html.EJS().HeatMap("container").TitleSettings(ts => 
ts.Text("Sales Revenue per Employee (in 1000 US$)").TextStyle(ViewBag.textStyle)).XAxis(xAxis =>
xAxis.Labels(ViewBag.xLabels)).YAxis(yaxis =>
yaxis.Labels(ViewBag.yLabels)).CellSettings(cs =>
cs.ShowLabel(false)).LegendSettings(ls =>
ls.Visible(true)).PaletteSettings(ps => ps.Palette(palette =>
{
    palette.Color("#C06C84").Add();
    palette.Color("#6C5B7B").Add();
    palette.Color("#355C7D").Add();
}).Type(Syncfusion.EJ2.HeatMap.PaletteType.Fixed)).DataSource(ViewBag.dataSource).Render()

public ActionResult LegendTypes()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
         };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         ViewBag.textStyle = new { fontStyle = "Italic",fontFamily = "Segoe UI"};
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = 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},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

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.

razor

placement.cs

@using Syncfusion.EJ2;
@Html.EJS().HeatMap("container").TitleSettings(ts => 
ts.Text("Sales Revenue per Employee (in 1000 US$)").TextStyle(ViewBag.textStyle)).XAxis(xAxis =>
xAxis.Labels(ViewBag.xLabels)).YAxis(yaxis =>
yaxis.Labels(ViewBag.yLabels)).LegendSettings(ls =>
ls.Position(Syncfusion.EJ2.HeatMap.LegendPosition.Top)).DataSource(ViewBag.dataSource).Render()

public ActionResult Placement()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
         };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = 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},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

Heatmap Sample

Alignment

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

razor

alignment.cs

@using Syncfusion.EJ2;
@Html.EJS().HeatMap("container").TitleSettings(ts => 
ts.Text("Sales Revenue per Employee (in 1000 US$)").TextStyle(ViewBag.textStyle)).XAxis(xAxis =>
xAxis.Labels(ViewBag.xLabels)).YAxis(yaxis =>
yaxis.Labels(ViewBag.yLabels)).LegendSettings(ls =>
ls.Position(Syncfusion.EJ2.HeatMap.LegendPosition.Top).Alignment(Syncfusion.EJ2.HeatMap.Alignment.Near).Width("150px")).DataSource(ViewBag.dataSource).Render()

public ActionResult Alignment()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
         };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = 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},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

Heatmap Sample

Legend dimensions

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

razor

dimensions.cs

@using Syncfusion.EJ2;
@Html.EJS().HeatMap("container").TitleSettings(ts => 
ts.Text("Sales Revenue per Employee (in 1000 US$)").TextStyle(ViewBag.textStyle)).XAxis(xAxis =>
xAxis.Labels(ViewBag.xLabels)).YAxis(yaxis =>
yaxis.Labels(ViewBag.yLabels)).LegendSettings(ls =>
ls.Position(Syncfusion.EJ2.HeatMap.LegendPosition.Right).Height("150px")).DataSource(ViewBag.dataSource).Render()

public ActionResult Dimensions()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
         };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = 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},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

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.

razor

paging.cs

@using Syncfusion.EJ2;
@Html.EJS().HeatMap("container").TitleSettings(ts => 
ts.Text("Sales Revenue per Employee (in 1000 US$)").TextStyle(ViewBag.textStyle)).XAxis(xAxis =>
xAxis.Labels(ViewBag.xLabels)).YAxis(yaxis =>
yaxis.Labels(ViewBag.yLabels)).PaletteSettings(ps => ps.Palette(palette =>
{
    palette.Value(0).Color("#C2E7EC").Add();
    palette.Value(10).Color("#AEDFE6").Add();
    palette.Value(20).Color("#9AD7E0").Add();
    palette.Value(25).Color("#86CFDA").Add();
    palette.Value(30).Color("#72C7D4").Add();
    palette.Value(40).Color("#5EBFCE").Add();
    palette.Value(50).Color("#4AB7C8").Add();
    palette.Value(55).Color("#36AFC2").Add();
    palette.Value(60).Color("#309DAE").Add();
    palette.Value(70).Color("#2B8C9B").Add();
    palette.Value(75).Color("#257A87").Add();
    palette.Value(80).Color("#206974").Add();
    palette.Value(85).Color("#1B5761").Add();
    palette.Value(90).Color("#15464D").Add();
    palette.Value(100).Color("#000000").Add();
}).Type(Syncfusion.EJ2.HeatMap.PaletteType.Fixed)).LegendSettings(ls =>
ls.Position(Syncfusion.EJ2.HeatMap.LegendPosition.Right).Height("150px")).DataSource(ViewBag.dataSource).Render()

public ActionResult Paging()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
         };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = 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},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

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.

razor

smart-legend.cs

@using Syncfusion.EJ2;
@Html.EJS().HeatMap("container").TitleSettings(ts => 
ts.Text("Sales Revenue per Employee (in 1000 US$)").TextStyle(ViewBag.textStyle)).XAxis(xAxis =>
xAxis.Labels(ViewBag.xLabels)).YAxis(yaxis =>
yaxis.Labels(ViewBag.yLabels)).CellSettings(cs => cs.ShowLabel(false)).PaletteSettings(ps => ps.Palette(palette =>
{
    palette.Value(0).Color("#C2E7EC").Add();
    palette.Value(10).Color("#AEDFE6").Add();
    palette.Value(20).Color("#9AD7E0").Add();
    palette.Value(30).Color("#72C7D4").Add();
    palette.Value(40).Color("#5EBFCE").Add();
    palette.Value(50).Color("#4AB7C8").Add();
    palette.Value(60).Color("#309DAE").Add();
    palette.Value(70).Color("#2B8C9B").Add();
    palette.Value(80).Color("#206974").Add();
    palette.Value(90).Color("#15464D").Add();
    palette.Value(100).Color("#000000").Add();
}).Type(Syncfusion.EJ2.HeatMap.PaletteType.Fixed)).LegendSettings(ls =>
ls.Position(Syncfusion.EJ2.HeatMap.LegendPosition.Bottom).Width("75%").EnableSmartLegend(true)).DataSource(ViewBag.dataSource).Render()

public ActionResult Legend()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
    };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = 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},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

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.

razor

legend-selection.cs

@using Syncfusion.EJ2;
@Html.EJS().HeatMap("container").TitleSettings(ts => 
ts.Text("Sales Revenue per Employee (in 1000 US$)").TextStyle(ViewBag.textStyle)).XAxis(xAxis =>
xAxis.Labels(ViewBag.xLabels)).YAxis(yaxis =>
yaxis.Labels(ViewBag.yLabels)).CellSettings(cs => cs.ShowLabel(false)).PaletteSettings(ps => ps.Palette(palette =>
{
    palette.Value(0).Color("#C2E7EC").Add();
    palette.Value(10).Color("#AEDFE6").Add();
    palette.Value(20).Color("#9AD7E0").Add();
    palette.Value(30).Color("#72C7D4").Add();
    palette.Value(40).Color("#5EBFCE").Add();
    palette.Value(50).Color("#4AB7C8").Add();
    palette.Value(60).Color("#309DAE").Add();
    palette.Value(70).Color("#2B8C9B").Add();
    palette.Value(80).Color("#206974").Add();
    palette.Value(90).Color("#15464D").Add();
    palette.Value(100).Color("#000000").Add();
}).Type(Syncfusion.EJ2.HeatMap.PaletteType.Fixed)).LegendSettings(ls =>
ls.Position(Syncfusion.EJ2.HeatMap.LegendPosition.Bottom).Width("75%").EnableSmartLegend(true).ToggleVisibility(true)).DataSource(ViewBag.dataSource).Render()

public ActionResult Legend()
{
    ViewBag.textStyle = new
     {
         size= "15px",
         fontWeight= "500",
         fontStyle= "Normal",
         fontFamily= "Segoe UI"
    };
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = 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},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

Heatmap Sample

Legend Title

The legend title displays a specific information about the legend. You can enable the legend title by setting the title property by providing the text and customizing the legend title text style using the textStyle property.

razor

legend-title.cs

@using Syncfusion.EJ2;
@Html.EJS().HeatMap("container").TitleSettings(ts => 
ts.Text("Sales Revenue per Employee")).XAxis(xAxis =>
xAxis.Labels(ViewBag.xLabels)).YAxis(yaxis =>
yaxis.Labels(ViewBag.yLabels)).CellSettings(cs => cs.ShowLabel(false)).PaletteSettings(ps => ps.Palette(palette =>
{
    palette.Value(0).Color("#6EB5D0").Add();
    palette.Value(50).Color("#7EDCA2").Add();
    palette.Value(100).Color("#DCD57E").Add();
}).Type(Syncfusion.EJ2.HeatMap.PaletteType.Fixed)).LegendSettings(ls =>
ls.Position(Syncfusion.EJ2.HeatMap.LegendPosition.Bottom).Width("75%").EnableSmartLegend(true).ToggleVisibility(true).Title(title=>title.Text("1000 US$"))).DataSource(ViewBag.dataSource).Render()

public ActionResult Legend()
{
         string[] xlabels = new string[12] { "Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Paul", "Karin", "Mario" };
         ViewBag.xLabels = xlabels;
         string[] yLabels = new string[6] { "Mon", "Tues", "Wed", "Thurs", "Fri", "Sat" };
         ViewBag.yLabels = yLabels;
         ViewBag.dataSource = GetDataSource();
         return View();
}

 private int[,] GetDataSource()
 {
     int[,] data = 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},
                {56, 69, 21, 86, 3, 33},
                {45, 7, 53, 81, 95, 79},
                {60, 77, 74, 68, 88, 51},
                {25, 25, 10, 12, 78, 14},
                {25, 56, 55, 58, 12, 82},
                {74, 33, 88, 23, 86, 59}
            };
            return data;
 }

Heatmap Sample

Contents

Legend types
Placement
Alignment
Legend dimensions
Paging for legend
Smart Legend
Legend Selection
Legend Title

Contents

Legend types
Placement
Alignment
Legend dimensions
Paging for legend
Smart Legend
Legend Selection
Legend Title

Please provide additional information

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