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Localization in Blazor ComboBox component

Blazor server side

Add UseRequestLocalization middle-ware in Configure method in Startup.cs file to get browser Culture Info.

Refer the following code to add configuration in Startup.cs file

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Localization;

namespace BlazorApplication
{
    public class Startup
    {
        ....
        ....

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            app.UseRequestLocalization();
            ....
            ....
        }
    }
}

The Localization library allows you to localize default text content. The ComboBox component has static text that can be changed to other cultures (Arabic, Deutsch, French, etc.).

In the following examples, demonstrate how to enable Localization for ComboBox in server side Blazor samples. Here, we have used Resource file to translate the static text.

The Resource file is an XML file which contains the strings(key and value pairs) that you want to translate into different language. You can also refer Localization link to know more about how to configure and use localization in the ASP.Net Core application framework.

  • Open the Startup.cs file and add the below configuration in the ConfigureServices function as follows.
using Syncfusion.Blazor;
using System.Globalization;
using Microsoft.AspNetCore.Localization;

namespace BlazorApplication
{
    public class Startup
    {
        ....
        ....
        public void ConfigureServices(IServiceCollection services)
        {
            ....
            ....
            services.AddSyncfusionBlazor();
            services.AddLocalization(options => options.ResourcesPath = "Resources");
            services.Configure<RequestLocalizationOptions>(options =>
            {
                // define the list of cultures your app will support
                var supportedCultures = new List<CultureInfo>()
                {
                    new CultureInfo("de")
                };
                // set the default culture
                options.DefaultRequestCulture = new RequestCulture("de");
                options.SupportedCultures = supportedCultures;
                options.SupportedUICultures = supportedCultures;
                options.RequestCultureProviders = new List<IRequestCultureProvider>() {
                 new QueryStringRequestCultureProvider() // Here, You can also use other localization provider
                };
            });
            services.AddSingleton(typeof(ISyncfusionStringLocalizer), typeof(SampleLocalizer));
        }
    }
}
  • Then, write a class by inheriting ISyncfusionStringLocalizer interface and override the Manager property to get the resource file details from the application end.
using Syncfusion.Blazor;

namespace blazorDropdowns
{
     public class SampleLocalizer : ISyncfusionStringLocalizer
    {

        public string Get(string key)
        {
            return this.Manager.GetString(key);
        }

        public System.Resources.ResourceManager Manager
        {
            get
            {
                return blazorDropdowns.Resources.SyncfusionBlazorLocale.ResourceManager;
            }
        }
    }
}
  • Add .resx file to Resource folder and enter the key value (Locale Keywords) in the Name column and the translated string in the Value column as follows.
Name Value (in Deutsch culture)
ComboBox_ActionFailureTemplate Die Anfrage ist fehlgeschlagen
ComboBox_NoRecordsTemplate Keine Aufzeichnungen gefunden
  • Finally, Specify the culture for ComboBox using locale property.
@using Syncfusion.Blazor.DropDowns

<SfComboBox TValue="string" TItem="Games" Placeholder="Select a game" Locale="de" AllowFiltering="true" DataSource="@LocalData">
    <ComboBoxFieldSettings Value="ID" Text="Text"></ComboBoxFieldSettings>
</SfComboBox>

@code {
    public class Games
    {
        public string ID { get; set; }
        public string Text { get; set; }
    }
    List<Games> LocalData = new List<Games> {
    new Games() { ID= "Game1", Text= "American Football" },
    new Games() { ID= "Game2", Text= "Badminton" },
    new Games() { ID= "Game3", Text= "Basketball" },
    new Games() { ID= "Game4", Text= "Cricket" },
    new Games() { ID= "Game5", Text= "Football" },
    new Games() { ID= "Game6", Text= "Golf" }
  };
}

Blazor WebAssembly

The Localization library allows you to localize the static text content of the NoRecordsTemplate and ActionFailureTemplate properties according to the culture currently assigned to the ComboBox.

Locale key en-US (default)
NoRecordsTemplate No records found
ActionFailureTemplate The request failed

The following steps explain how to render the ComboBox in French culture (fr) in Blazor Web Assembly application.

  • Open the program.cs file and add the below configuration in the Builder ConfigureServices function as follows.
using Syncfusion.Blazor;
using Microsoft.AspNetCore.Builder;

namespace WebAssemblyLocale
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            ....
            ....
            builder.Services.Configure<RequestLocalizationOptions>(options =>
            {
                // Define the list of cultures your app will support
                var supportedCultures = new List<System.Globalization.CultureInfo>()
                {
                    new System.Globalization.CultureInfo("en-US"),
                    new System.Globalization.CultureInfo("fr"),
                };

                // Set the default culture
                options.DefaultRequestCulture = new Microsoft.AspNetCore.Localization.RequestCulture("fr");

                options.SupportedCultures = supportedCultures;
                options.SupportedUICultures = supportedCultures;
                options.RequestCultureProviders = new List<Microsoft.AspNetCore.Localization.IRequestCultureProvider>() {
                 new Microsoft.AspNetCore.Localization.QueryStringRequestCultureProvider()
                };
            });
            ....
            ....
        }
    }
}

  • To download the locale definition of Blazor components, use this link.

  • After downloading the blazor-locale package, copy the blazor-locale folder with required local definition file into wwwroot folder.

  • By default, the blazor-locale package contains the localized text for static text present in components like button text, placeholder, tooltip, and more.

  • Set the culture by using the SetCulture method.

In the following sample, French culture is set to the ComboBox and no data is loaded. Hence, the NoRecordsTemplate property displays its text in French culture initially, and if the sample is run offline, the ActionFailureTemplate property displays its text appropriately.

@using Syncfusion.Blazor.Data
@using Syncfusion.Blazor.DropDowns
@inject HttpClient Http;

 <SfComboBox TValue="string" TItem="EmployeeData" Query="@Query" Placeholder="Select a customer" Locale="fr" AllowFiltering="true">
    <SfDataManager Url="https://ej2services.syncfusion.com/production/web-services/api/Employees" Adaptor="Adaptors.WebApiAdaptor" CrossDomain=true></SfDataManager>
    <ComboBoxFieldSettings Value="Country" Text="FirstName"></ComboBoxFieldSettings>
</SfComboBox>

@code {
    [Inject]
    protected IJSRuntime JsRuntime { get; set; }
    protected override async Task OnInitializedAsync()
    {
        this.JsRuntime.Sf().LoadLocaleData(await Http.GetJsonAsync<object>("blazor-locale/src/fr.json")).SetCulture("fr");
    }
    public Query Query = new Query();
    public class EmployeeData
    {
        public int EmployeeID { get; set; }
        public string FirstName { get; set; }
        public string Designation { get; set; }
    }
}

The output will be as follows.

ComboBox

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