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Getting Started with Dropdown Tree in Blazor WASM App

25 Jun 20266 minutes to read

This section briefly explains about how to include Blazor Dropdown Tree component in a Blazor WebAssembly App using Visual Studio, Visual Studio Code, and the .NET CLI.

Create a new Blazor WebAssembly (Standalone) App

Create a Blazor WebAssembly App using Visual Studio via Microsoft Templates or the Blazor Extension.

Run the following command to create a new Blazor WebAssembly App.

dotnet new blazorwasm -o BlazorApp
cd BlazorApp

Alternatively, create a Blazor WebAssembly App using Visual Studio Code via Microsoft Templates or the Blazor Extension, or the C# Dev Kit extension.

Run the following command to create a new Blazor WebAssembly App.

dotnet new blazorwasm -o BlazorApp
cd BlazorApp

Install the required Blazor packages

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

  1. Go to Tools → NuGet Package Manager → Manage NuGet Packages for Solution.
  2. Search the required NuGet packages (Syncfusion.Blazor.Navigations and Syncfusion.Blazor.Themes) and install them.

Alternatively, you can install the same packages using the Package Manager Console with the following commands.

Install-Package Syncfusion.Blazor.Navigations -Version 33.2.3
Install-Package Syncfusion.Blazor.Themes -Version 33.2.3

Open the terminal and run the following commands.

dotnet add package Syncfusion.Blazor.Navigations -v 33.2.3
dotnet add package Syncfusion.Blazor.Themes -v 33.2.3

Open the command prompt and run the following commands.

dotnet add package Syncfusion.Blazor.Navigations -v 33.2.3
dotnet add package Syncfusion.Blazor.Themes -v 33.2.3

Add import namespaces

After the packages are installed, open the ~/_Imports.razor file and import the Syncfusion.Blazor and Syncfusion.Blazor.Navigations namespaces.

@using Syncfusion.Blazor
@using Syncfusion.Blazor.Navigations

Register the Blazor service

Open the Program.cs file in Blazor WebAssembly App and register the Blazor service.

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

Add stylesheet and script resources

The theme stylesheet and script can be accessed from NuGet through Static Web Assets. Include the stylesheet and script references in the ~wwwroot/index.html file.

...
<link href="_content/Syncfusion.Blazor.Themes/fluent2.css" rel="stylesheet" />
...
<script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>

Add Blazor Dropdown Tree component

Open a Razor file located in the ~/Pages/*.razor (for example, Home.razor) and add the Blazor Dropdown Tree component inside the razor file.

The TValue parameter specifies the type of the Value property, while TItem specifies the model class for the DataSource property.

@using Syncfusion.Blazor.Navigations

<SfDropDownTree TItem="EmployeeData" TValue="string" Placeholder="Select an employee" Width="500px"> 
    <DropDownTreeField TItem="EmployeeData" DataSource="Data" Id="Id" Text="Name" HasChildren="HasChild" ParentID="PId"></DropDownTreeField>
</SfDropDownTree>

@code 
{
    List<EmployeeData> Data = new List<EmployeeData>
    {
        new EmployeeData() {Id="1", Name = "Steven Buchanan", HasChild=true, Expanded=true},
        new EmployeeData() {Id="2", PId="1", Name = "Laura Callahan", HasChild=true},
        new EmployeeData() {Id="3", PId="2", Name = "Andrew Fuller", HasChild=true },
        new EmployeeData() {Id="4", PId="3", Name = "Anne Dodsworth" },
        new EmployeeData() {Id="5", PId="3", Name = "Lilly" }
    };
    public class EmployeeData
    {
        public string? Id { get; set; }
        public string? Name { get; set; }
        public bool HasChild { get; set; }
        public bool Expanded { get; set; }
        public string? PId { get; set; }
    }
}

Run the application

Press Ctrl+F5 (Windows) or ⌘+F5 (macOS) to launch the application. The Blazor Dropdown Tree component will render in your default web browser.

Open the terminal and run the following command.

dotnet run

Open the command prompt and run the following command.

dotnet run
Blazor Dropdown Tree Component

NOTE

View Sample in GitHub.