Getting Started with Blazor AutoComplete Component

29 Jan 20248 minutes to read

This section briefly explains about how to include Blazor AutoComplete component in your Blazor Server App and Blazor WebAssembly App using Visual Studio.

To get started quickly with Blazor AutoComplete component, you can check on this video or GitHub

Prerequisites

Create a new Blazor App in Visual Studio

You can create a Blazor Server App or Blazor WebAssembly App using Visual Studio via Microsoft Templates or the Syncfusion Blazor Extension

Install Syncfusion Blazor DropDowns and Themes NuGet in the App

To add Blazor AutoComplete component in the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search and install Syncfusion.Blazor.DropDowns and Syncfusion.Blazor.Themes. Alternatively, you can utilize the following package manager command to achieve the same.

Install-Package Syncfusion.Blazor.DropDowns -Version 25.1.35
Install-Package Syncfusion.Blazor.Themes -Version 25.1.35

NOTE

Syncfusion Blazor components are available in nuget.org. Refer to NuGet packages topic for available NuGet packages list with component details.

Register Syncfusion Blazor Service

Open ~/_Imports.razor file and import the Syncfusion.Blazor namespace.

@using Syncfusion.Blazor
@using Syncfusion.Blazor.DropDowns

Now, register the Syncfusion Blazor Service in the ~/Program.cs file of your Blazor Server App or Blazor WebAssembly App.

using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Syncfusion.Blazor;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor();
builder.Services.AddSyncfusionBlazor();

var app = builder.Build();
....
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Syncfusion.Blazor;

var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");
builder.RootComponents.Add<HeadOutlet>("head::after");

builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

builder.Services.AddSyncfusionBlazor();
await builder.Build().RunAsync();
....

Add stylesheet and script resources

The theme stylesheet and script can be accessed from NuGet through Static Web Assets. Reference the stylesheet and script in the <head> of the main page as follows:

  • For .NET 6 Blazor Server app, include it in ~/Pages/_Layout.cshtml file.

  • For .NET 7 Blazor Server app, include it in the ~/Pages/_Host.cshtml file.

  • For Blazor WebAssembly app, include it in the ~/index.html file.

<head>
    ....
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
</head>

NOTE

Check out the Blazor Themes topic to discover various methods (Static Web Assets, CDN, and CRG) for referencing themes in your Blazor application. Also, check out the Adding Script Reference topic to learn different approaches for adding script references in your Blazor application.

Add Syncfusion Blazor Autocomplete component

Add the Syncfusion Blazor AutoComplete component in the ~/Pages/Index.razor file.

<SfAutoComplete TValue="string" TItem="Country" Placeholder="e.g. Australia" DataSource="@LocalData">
    <AutoCompleteFieldSettings Value="Name" />
</SfAutoComplete>

@code {

    public class Country
    {
        public string Name { get; set; }
        public string Code { get; set; }
    }

    List<Country> LocalData = new List<Country> {
        new Country() { Name = "Australia", Code = "AU" },
        new Country() { Name = "Bermuda", Code = "BM" },
        new Country() { Name = "Canada", Code = "CA" },
        new Country() { Name = "Cameroon", Code = "CM" },
        new Country() { Name = "Denmark", Code = "DK" }
    };
}
  • Press Ctrl+F5 (Windows) or ⌘+F5 (macOS) to launch the application.This will render the Syncfusion Blazor AutoComplete component in your default web browser.
![Blazor AutoComplete Component

Binding data source

After initialization, populate the AutoComplete with data using the DataSource property.

<SfAutoComplete TValue="string" TItem="Country" Placeholder="Select a country" DataSource="@LocalData">
    <AutoCompleteFieldSettings Value="Name" />
</SfAutoComplete>

@code {

    public class Country
    {
        public string Name { get; set; }
        public string Code { get; set; }
    }

    List<Country> LocalData = new List<Country> {
        new Country() { Name = "Australia", Code = "AU" },
        new Country() { Name = "Bermuda", Code = "BM" },
        new Country() { Name = "Canada", Code = "CA" },
        new Country() { Name = "Cameroon", Code = "CM" },
        new Country() { Name = "Denmark", Code = "DK" },
        new Country() { Name = "France", Code = "FR" },
        new Country() { Name = "Finland", Code = "FI" },
        new Country() { Name = "Germany", Code = "DE" },
        new Country() { Name = "Greenland", Code = "GL" },
        new Country() { Name = "Hong Kong", Code = "HK" },
        new Country() { Name = "India", Code = "IN" },
        new Country() { Name = "Italy", Code = "IT" },
        new Country() { Name = "Japan", Code = "JP" },
        new Country() { Name = "Mexico", Code = "MX" },
        new Country() { Name = "Norway", Code = "NO" },
        new Country() { Name = "Poland", Code = "PL" },
        new Country() { Name = "Switzerland", Code = "CH" },
        new Country() { Name = "United Kingdom", Code = "GB" },
        new Country() { Name = "United States", Code = "US" },
    };
}
Blazor AutoComplete with Data Binding

Custom values

The AutoComplete allows the users to give input as custom value, which is not required to present in predefined set of values. By default, this support is enabled by the AllowCustom property. The custom value will be sent to post back handler when a form is about to be submitted.

<SfAutoComplete TValue="string" TItem="Country" Placeholder="Select a country" AllowCustom=true DataSource="@LocalData">
    <AutoCompleteFieldSettings Value="Name" />
</SfAutoComplete>

Configure the suggestion list

By default, suggestion list width automatically adjusts according to the AutoComplete input element’s width, and the height of the suggestion list has 300px. The height and width of the popup list can also be customized using the PopupHeight and PopupWidth properties respectively.

<SfAutoComplete TValue="string" TItem="Country" Placeholder="Select a country" DataSource="@LocalData" PopupHeight="300px" PopupWidth="300px">
    <AutoCompleteFieldSettings Value="Name" />
</SfAutoComplete>
Customizing Popup Height and Width in Blazor AutoComplete

See also