Getting Started with ASP.NET MVC HeatMapChart Control

30 May 202214 minutes to read

This section briefly explains about how to include ASP.NET MVC HeatMapChart control in your ASP.NET MVC application using Visual Studio.

Prerequisites

System requirements for ASP.NET MVC controls

Create ASP.NET MVC application with HTML helper

Install ASP.NET MVC package in the application

Syncfusion ASP.NET MVC controls are available in nuget.org. Refer to NuGet packages topic to learn more about installing NuGet packages in various OS environments. To add ASP.NET MVC controls in the application, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.EJ2.MVC5 and then install it.

The Syncfusion.EJ2.MVC5 NuGet package has dependencies, Newtonsoft.Json for JSON serialization and Syncfusion.Licensing for validating Syncfusion license key.

If you create ASP.NET MVC application with MVC4 package, search for Syncfusion.EJ2.MVC4 and then install it.

Add namespace

Add Syncfusion.EJ2 namespace reference in Web.config under Views folder.

<namespaces>
    <add namespace="Syncfusion.EJ2"/>
</namespaces>

Add style sheet

Checkout the Themes topic to learn different ways (CDN, NPM package, and CRG) to refer styles in ASP.NET MVC application, and to have the expected appearance for Syncfusion ASP.NET MVC controls. Here, the theme is referred using CDN inside the <head> of ~/Views/Shared/_Layout.cshtml file as follows,

<head>
    ...
    <!-- Syncfusion ASP.NET MVC controls styles -->
    <link rel="stylesheet" href="https://cdn.syncfusion.com/ej2/20.3.56/fluent.css" />
</head>

Add script reference

In this getting started walk-through, the required scripts are referred using CDN inside the <head> of ~/Views/Shared/_Layout.cshtml file as follows,

<head>
    ...
    <!-- Syncfusion ASP.NET MVC controls scripts -->
    <script src="https://cdn.syncfusion.com/ej2/20.3.56/dist/ej2.min.js"></script>
</head>

Register Syncfusion Script Manager

Open ~/Views/Shared/_Layout.cshtml page and register the script manager EJS().ScriptManager() at the end of <body> in the ASP.NET MVC application as follows.

<body>
...
    <!-- Syncfusion ASP.NET MVC Script Manager -->
    @Html.EJS().ScriptManager()
</body>

Add ASP.NET MVC HeatMapChart control

Now, add the Syncfusion ASP.NET MVC HeatMapChart control in ~/Views/Home/Index.cshtml page.

@Html.EJS().HeatMap("container").Render()

Populate heat map with data

This section explains how to populate the following two-dimensional array data to the heat map.

@model int[,]

@Html.EJS().HeatMap("container").DataSource(Model).Render()
public ActionResult Index()
{
    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;
    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 View(data);
}

Press Ctrl+F5 (Windows) or +F5 (macOS) to run the app. Then, the Syncfusion ASP.NET MVC HeatMapChart control will be rendered in the default web browser.

ASP.NET MVC HeatMap Chart with Data

Enable axis labels

You can add axis labels to the heat map and format those labels using the xAxis and yAxis properties. Axis labels provide additional information about the data points populated in the heat map.

@model int[,]

@Html.EJS().HeatMap("container").XAxis(
            xAxis =>
            {
                xAxis.Labels(ViewBag.xLabels);
            }).YAxis(yaxis =>
            {
                yaxis.Labels(ViewBag.yLabels);
            }).DataSource(Model).Render()
public ActionResult Index()
{
    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;
    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 View(data);
}

ASP.NET MVC HeatMapChart with Axis

Add heat map title

Add a title using the TitleSettings property to the heat map to provide quick information to the user about the data populated in the heat map.

@model int[,]

@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);
		}).DataSource(Model).Render()
public ActionResult Index()
{
    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;
    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 View(data);
}

ASP.NET MVC HeatMapChart with Title

Enable legend

Use a legend for the heat map in the LegendSettings object by setting the Visible property to true.

@model int[,]

@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.Visible(true).Position(Syncfusion.EJ2.HeatMap.LegendPosition.Right).ShowLabel(true).Height("150px")).DataSource(Model).Render()

ASP.NET MVC HeatMapChart with Legend

Add data label

Add data labels to improve the readability of the heat map. This can be achieved by setting the ShowLabel property to true in the CellSettings object.

@model int[,]

@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.Visible(true).Position(Syncfusion.EJ2.HeatMap.LegendPosition.Right).ShowLabel(true).Height("150px")).CellSettings(cs =>cs.ShowLabel(true)).DataSource(Model).Render()

ASP.NET MVC HeatMapChart with DataLabel

Add custom cell palette

The default palette settings of the heat map cells can be customized by using the PaletteSettings property. Using the Palette property in paletteSettings object, you can change the color set for the cells. You can change the color mode of the cells to fixed or gradient mode using the Type property.

@model int[,]

@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.Visible(true).Position(Syncfusion.EJ2.HeatMap.LegendPosition.Right).ShowLabel(true).Height("150px")).CellSettings(cs =>cs.ShowLabel(true)).PaletteSettings(ps => ps.Palette(palette =>
        {
        palette.Color("#C06C84").Value(0).Add();
        palette.Color("#6C5B7B").Value(50).Add();
        palette.Color("#355C7D").Value(100).Add();
        }).Type(Syncfusion.EJ2.HeatMap.PaletteType.Gradient)).DataSource(Model).Render()

ASP.NET MVC HeatMapChart with Custom Cell Palette

Enable tooltip

The tooltip is used when you cannot display information by using the data labels due to space constraints. You can enable the tooltip by setting the ShowTooltip property to true.

@model int[,]

@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.Visible(true).Position(Syncfusion.EJ2.HeatMap.LegendPosition.Right).ShowLabel(true).Height("150px")).CellSettings(cs =>cs.ShowLabel(true)).ShowTooltip(true).PaletteSettings(ps => ps.Palette(palette =>
             {
                 palette.Color("#C06C84").Value(0).Add();
                 palette.Color("#6C5B7B").Value(50).Add();
                 palette.Color("#355C7D").Value(100).Add();
             }).Type(Syncfusion.EJ2.HeatMap.PaletteType.Gradient)).DataSource(Model).Render()

ASP.NET MVC HeatMapChart with Tooltip

View Sample in GitHub.