Getting Started with Blazor TreeMap in Blazor Web App

14 Apr 202612 minutes to read

This section briefly explains about how to include Syncfusion^® Blazor TreeMap component in your Blazor Web App using Visual Studio, Visual Studio Code, and the .NET CLI.

• Visual Studio
• Visual Studio Code
• .NET CLI

Prerequisites

• System requirements for Blazor components

Create a new Blazor Web App in Visual Studio

Create a Blazor Web App using Visual Studio via Microsoft Templates or the Syncfusion^® Blazor Extension. For detailed instructions, refer to the Blazor Web App Getting Started documentation.

Prerequisites

• System requirements for Blazor components

Create a new Blazor Web App in Visual Studio Code

Create a Blazor Web App using Visual Studio Code via Microsoft Templates or the Syncfusion^® Blazor Extension. For detailed instructions, refer to the Blazor Web App Getting Started documentation.

For example, in a Blazor Web App with the Auto interactive render mode, use the following commands in the integrated terminal (Ctrl+`):

Blazor Web App

dotnet new blazor -o BlazorWebApp -int Auto
cd BlazorWebApp
cd BlazorWebApp.Client

Prerequisites

Install the latest version of .NET SDK. If you previously installed the SDK, determine the installed version by executing the following command in a command prompt (Windows) or terminal (macOS) or command shell (Linux).

.NET CLI

dotnet --version

Create a Blazor Web App using .NET CLI

Run the following command to create a new Blazor Web App in a command prompt (Windows) or terminal (macOS) or command shell (Linux). For detailed instructions, refer to the Blazor Web App Getting Started documentation.

For example, in a Blazor Web App with the Auto interactive render mode, use the following commands:

Blazor Web App

dotnet new blazor -o BlazorWebApp -int Auto
cd BlazorWebApp
cd BlazorWebApp.Client

NOTE

Configure the appropriate Interactive render mode and Interactivity location while creating a Blazor Web App. For detailed information, refer to the interactive render mode documentation.

Install Syncfusion^® Blazor packages

Install Syncfusion.Blazor.TreeMap NuGet package in your project using the NuGet Package Manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), or the integrated terminal in Visual Studio Code (dotnet add package), or the .NET CLI.

Alternatively, run the following command in the Package Manager Console to achieve the same.

Package Manager

Install-Package Syncfusion.Blazor.TreeMap -Version 33.2.3

If using the WebAssembly or Auto render modes in the Blazor Web App, install this package in the client project.

NOTE

All Syncfusion Blazor packages are available on nuget.org. See the NuGet packages topic for details.

Add import namespaces

After the packages are installed, open the ~/_Imports.razor file in the client project and import the Syncfusion.Blazor and Syncfusion.Blazor.TreeMap namespaces.

~/_Imports.razor

@using Syncfusion.Blazor
@using Syncfusion.Blazor.TreeMap

Register Syncfusion^® Blazor service

Register the Syncfusion Blazor service in the Program.cs file of your Blazor Web App.

Program.cs

....
using Syncfusion.Blazor;
....
builder.Services.AddSyncfusionBlazor();
....

NOTE

If the Interactive Render Mode is set to WebAssembly or Auto, register the Syncfusion^® Blazor service in Program.cs files of both the server and client projects in your Blazor Web App.

Add script resources

The script can be accessed from NuGet through Static Web Assets. Include the script reference in the ~/Components/App.razor file.

<script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>

NOTE

Check out the Adding Script Reference topic to learn different approaches for adding script references in your Blazor application.

Add Syncfusion^® Blazor TreeMap component

Add the Syncfusion^® Blazor TreeMap component in the ~/Components/Pages/*.razor file. If the interactivity location is set to Per page/component in the Web App, define a render mode at the top of the ~/Pages/*.razor file. (For example, InteractiveServer, InteractiveWebAssembly or InteractiveAuto).

NOTE

If the Interactivity Location is set to Global with Auto or WebAssembly, the render mode is automatically configured in the App.razor file by default.

RAZOR

@* desired render mode define here *@
@rendermode InteractiveAuto

• You can use the DataSource property to load the car sales details in the TreeMap component. Specify a field name from the data source in the WeightValuePath property to calculate the TreeMap item size.

Home.razor

<SfTreeMap DataSource="GrowthReport"
            WeightValuePath="GDP"
            TValue="Country">
</SfTreeMap>

@code {
    public class Country
    {
        public string Name { get; set; }
        public double GDP { get; set; }
    }
    public List<Country> GrowthReport = new List<Country> {
        new Country  {Name="United States", GDP=17946 },
        new Country  {Name="China", GDP=10866 },
        new Country  {Name="Japan", GDP=4123 },
        new Country  {Name="Germany", GDP=3355 },
        new Country  {Name="United Kingdom", GDP=2848 },
        new Country  {Name="France", GDP=2421 },
        new Country  {Name="India", GDP=2073 },
        new Country  {Name="Italy", GDP=1814 },
        new Country  {Name="Brazil", GDP=1774 },
        new Country  {Name="Canada", GDP=1550 }
    };
}

• Press Ctrl+F5 (Windows) or ⌘+F5 (macOS) to launch the application. This will render the Syncfusion^® Blazor TreeMap component in the default web browser.

NOTE

View Sample in GitHub.

Adding labels in Blazor TreeMap items

Add label text to the leaf items in the TreeMap component by setting the field name from data source in the LabelPath property in the TreeMapLeafItemSettings, and it provides information to the user about the leaf items.

Home.razor

<SfTreeMap DataSource="GrowthReport"
            WeightValuePath="GDP"
            TValue="Country">
    <TreeMapLeafItemSettings LabelPath="Name" Fill="lightgray"></TreeMapLeafItemSettings>
</SfTreeMap>

NOTE

Refer to the code block to know about the property value of the GrowthReport.

Adding title to Blazor TreeMap

Add a title using the Text property in the TreeMapTitleSettings to provide quick information to the user about the items rendered in the TreeMap.

Home.razor

<SfTreeMap DataSource="GrowthReport"
            WeightValuePath="GDP"
            TValue="Country">
    <TreeMapTitleSettings Text="Top 10 countries by GDP Nominal - 2015"></TreeMapTitleSettings>
    <TreeMapLeafItemSettings LabelPath="Name" Fill="lightgray"></TreeMapLeafItemSettings>
</SfTreeMap>

NOTE

Refer to the code block to know about the property value of the GrowthReport.

NOTE

View Sample in GitHub.

Apply color mapping

The color mapping supports customization of item colors based on the underlying value received from the bound data source. Specify the field name from which the values have to be compared for the items in the RangeColorValuePath property in SfTreeMap. Also, specify range value and color in the TreeMapLeafColorMapping. Here, in this example, “Orange” is specified for the range “0 - 3000” and “Green” is specified for the range “3000 - 20000”.

Home.razor

<SfTreeMap DataSource="GrowthReport"
            WeightValuePath="GDP"
            TValue="Country"
            RangeColorValuePath="GDP">
    <TreeMapTitleSettings Text="Top 10 countries by GDP Nominal - 2015"></TreeMapTitleSettings>
    <TreeMapLeafItemSettings LabelPath="Name" Fill="lightgray">
        <TreeMapLeafColorMappings>
            <TreeMapLeafColorMapping StartRange="0" EndRange="3000" Color="@(new string[] { "Orange" })"></TreeMapLeafColorMapping>
            <TreeMapLeafColorMapping StartRange="3000" EndRange="20000" Color="@(new string[] { "Green" })"></TreeMapLeafColorMapping>
        </TreeMapLeafColorMappings>
    </TreeMapLeafItemSettings>
</SfTreeMap>

NOTE

Refer to the code block to know about the property value of the GrowthReport.

Enable legend

Legend items are used to denote the color mapping categories and show the legend for the TreeMap by setting the Visible property to true in the TreeMapLegendSettings.

Home.razor

<SfTreeMap DataSource="GrowthReport"
            WeightValuePath="GDP"
            TValue="Country"
            RangeColorValuePath="GDP">
    <TreeMapTitleSettings Text="Top 10 countries by GDP Nominal - 2015"></TreeMapTitleSettings>
    <TreeMapLeafItemSettings LabelPath="Name" Fill="lightgray">
        <TreeMapLeafColorMappings>
            <TreeMapLeafColorMapping StartRange="0" EndRange="3000" Color="@(new string[] { "Orange" })"></TreeMapLeafColorMapping>
            <TreeMapLeafColorMapping StartRange="3000" EndRange="20000" Color="@(new string[] { "Green" })"></TreeMapLeafColorMapping>
        </TreeMapLeafColorMappings>
    </TreeMapLeafItemSettings>
    <TreeMapLegendSettings Visible="true"></TreeMapLegendSettings>
</SfTreeMap>

NOTE

Refer to the code block to know about the property value of the GrowthReport.

Enable tooltip

When space constraints prevents from displaying information using data labels, the tooltip comes in handy. The tooltip can be enabled by setting the Visible property to true in the TreeMapTooltipSettings.

Home.razor

<SfTreeMap DataSource="GrowthReport"
            WeightValuePath="GDP"
            TValue="Country"
            RangeColorValuePath="GDP">
    <TreeMapTitleSettings Text="Top 10 countries by GDP Nominal - 2015"></TreeMapTitleSettings>
    <TreeMapLeafItemSettings LabelPath="Name" Fill="lightgray">
        <TreeMapLeafColorMappings>
            <TreeMapLeafColorMapping StartRange="0" EndRange="3000" Color="@(new string[] { "Orange" })"></TreeMapLeafColorMapping>
            <TreeMapLeafColorMapping StartRange="3000" EndRange="20000" Color="@(new string[] { "Green" })"></TreeMapLeafColorMapping>
        </TreeMapLeafColorMappings>
    </TreeMapLeafItemSettings>
    <TreeMapLegendSettings Visible="true"></TreeMapLegendSettings>
    <TreeMapTooltipSettings Visible="true"></TreeMapTooltipSettings>
</SfTreeMap>

NOTE

Refer to the code block to know about the property value of the GrowthReport.

NOTE

You can also explore our Blazor TreeMap example that shows you how to render and configure the treemap.

See also

• Getting Started with Syncfusion^® Blazor for Client-Side in .NET Core CLI

• Getting Started with Syncfusion^® Blazor for Server-Side in Visual Studio

• Getting Started with Syncfusion^® Blazor for Server-Side in .NET Core CLI