Getting Started with Blazor AutoComplete in Blazor Web App

16 Feb 20247 minutes to read

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

Prerequisites

Create a new Blazor Web App

You can create a Blazor Web App using Visual Studio 2022 via Microsoft Templates or the Syncfusion Blazor Extension.

You need to configure the corresponding Interactive render mode and Interactivity location while creating a Blazor Web Application.

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.

If you utilize WebAssembly or Auto render modes in the Blazor Web App need to be install Syncfusion Blazor components NuGet packages within the client project.

Alternatively, you can utilize the following package manager command to achieve the same.

Install-Package Syncfusion.Blazor.DropDowns -Version 24.2.3
Install-Package Syncfusion.Blazor.Themes -Version 24.2.3

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 and Syncfusion.Blazor.DropDowns namespace .

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

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

If you select an Interactive render mode as WebAssembly or Auto, you need to register the Syncfusion Blazor service in both ~/Program.cs files of your Blazor Web App.

....
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 reference in the <head> section and the script reference at the end of the <body> in the ~/Components/App.razor file as shown below:

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

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/.razor file. If an interactivity location as Per page/component in the web app, define a render mode at the top of the ~Pages/.razor component, as follows:

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

NOTE

View Sample in GitHub

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