Questions on UI for Blazor Forum

1 answer

293 views

Memory usage increasing with TelerikDrawer (Out of Memory exception)

I have a Right Drawer containing a nested Left Drawer. In the OnInitializedAsync, i have a loop doing nothing: this loop increases my RAM usage until my application crashes with "Out of memory", like there was a memory leak.

If i remove the nested Left Drawer, memory usage doesn't increase anymore.

I've made the loop part just to simulate the "Out of memory" we get in the real application, when we have to handle a lot of SignalR events.

<TelerikDrawer @ref="RightDrawer" Class="right-drawer" Data="RightMenuItems" Mode="DrawerMode.Overlay" Position="DrawerPosition.Right" @bind-Expanded="IsRightMenuExpanded"> <Template> <div class="k-drawer-items"> <ul> @foreach (var item in RightMenuItems) { <li @onclick:stopPropagation @onclick="(() => RightMenuItemClick(item))" class="k-drawer-item @GetSelectedRightMenuItemCssClass(item)" style="height: 40px; vertical-align: middle; padding-top: 0; padding-bottom: 0; white-space: nowrap"> <div> <span class="@item.IconClass" style="vertical-align:middle;"></span> <span class="k-item-text" style="vertical-align:middle;">@item.Text</span> @if (RightDrawer.Expanded && item.Expanded && (item.Children?.Any() ?? false)) { <span class="k-icon k-i-arrow-chevron-down" style="position:absolute; right:0; line-height:inherit; margin:0 8px; vertical-align:middle;"></span> } else if (RightDrawer.Expanded && !item.Expanded && (item.Children?.Any() ?? false)) { <span class="k-icon k-i-arrow-chevron-right" style="position:absolute; right:0; line-height:inherit; margin:0 8px; vertical-align:middle;"></span> } </div> </li> } </ul> </div> </Template> <Content>  <TelerikDrawer Class="left-drawer" Data="LeftMenuItems" Mode="DrawerMode.Push"> <Content> <div id="main-layout-content"> @Body </div> </Content> </TelerikDrawer> </Content> </TelerikDrawer>

This is the OnInitializedAsync:

protected override async Task OnInitializedAsync()
        {
            StateHasChanged();

            Text = "Start";
            
            await Task.Delay(1000);

            for (int i = 0; i < 10000000; i++)
            {
                await Task.Delay(1);
            }
            await Task.Delay(1000);
            Text = "End";

        }

Drawer

answered on 10 May 2021

1 answer

1.4K+ views

Window: Load external razor page

Is there a way to load a razor page into the WindowContent section of the Blazor Window? Similar to how this works with RadWindow in Telerik Ajax. Basically the goal is to have a universal Telerik window that we can pass parameters and launch from any page. When the Window launches it would load the relevant content page (passed from one of the parameters). For instance a site privacy document within the window.

Window

answered on 10 May 2021

1 answer

1.3K+ views

Issue with uploading between Client and Server

I have my solution as an API Server on .Net 5 that does all the weightlifting, Elsa workflows, database IO & integrations. The portal is a Blazor Server-Side application on .Net 5. The deployment is like so:

The portal connects with the API with the standard HttpClient dependency injection. Here is the API setup first:

API - Program.cs

    public class Program
    {
        public static void Main(string[] args)
        {
            try
            {
                using IHost host = CreateHostBuilder(args).Build();
                host.Run();
            }
            catch (Exception ex)
            {
                if (Log.Logger == null || Log.Logger.GetType().Name == "SilentLogger")
                {
                    Log.Logger = new LoggerConfiguration()
                        .MinimumLevel.Debug()
                        .WriteTo.Console()
                        .CreateLogger();
                }

                Log.Fatal(ex, "Host terminated unexpectedly");
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        private static IHostBuilder CreateHostBuilder(string[] args)
           => Host.CreateDefaultBuilder(args)
                  .UseServiceProviderFactory(new AutofacServiceProviderFactory(Register))
                  .ConfigureWebHostDefaults(webBuilder =>
                  {
                    webBuilder.UseStartup<Startup>()
                       .CaptureStartupErrors(true)
                       .ConfigureAppConfiguration(config => { config.AddJsonFile("appSettings.Local.json", optional: true); })
                       .UseSerilog((hostingContext, loggerConfiguration) =>
                       {
                           loggerConfiguration
                               .ReadFrom.Configuration(hostingContext.Configuration)
                               .Enrich.FromLogContext()
                               .Enrich.WithProperty("ApplicationName", typeof(Program).Assembly.GetName().Name)
                               .Enrich.WithProperty("Environment", hostingContext.HostingEnvironment);

                            #if DEBUG
                           loggerConfiguration.Enrich.WithProperty("DebuggerAttached", Debugger.IsAttached);
                            #endif
                       });
                  });

        private static void Register(ContainerBuilder builder) => builder.RegisterLogger(autowireProperties: true);

    }

API - Startup.cs

    public class Startup
    {
        private IWebHostEnvironment CurrentEnvironment { get; }
        private IConfiguration      Configuration      { get; }

        private const string MyAllowSpecificOrigins = "_myAllowSpecificOrigins";

        public Startup(IConfiguration configuration, IWebHostEnvironment env)
        {
            Configuration      = configuration;
            CurrentEnvironment = env;
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddLogging();

            services.AddControllers()
                    .AddJsonOptions(options =>
                     {
                         options.JsonSerializerOptions.IgnoreNullValues = true;
                         options.JsonSerializerOptions.WriteIndented    = true;
                     });

            services.AddMvc(options => options.EnableEndpointRouting = false)
                    .SetCompatibilityVersion(CompatibilityVersion.Version_3_0)
                    .AddXmlSerializerFormatters();

            services.AddHealthChecks();

            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo
                {
                    Title   = "Api",
                    Version = "v1",
                    Contact = new OpenApiContact
                    {
                        Name  = "Me",
                        Email = "Me@Company.co",
                        Url   = new Uri("https://internet exposed url/")
                    }
                });
            });

            services.AddDbContext<PrimaryDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("PrimaryConnection")));

            services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
                    .AddJwtBearer(options =>
                     {
                         options.TokenValidationParameters = new TokenValidationParameters
                         {
                             ValidateIssuer           = true,
                             ValidateAudience         = true,
                             ValidateLifetime         = true,
                             ValidateIssuerSigningKey = true,
                             ValidIssuer              = Configuration["Tokens:Issuer"],
                             ValidAudience            = Configuration["Tokens:Issuer"],
                             IssuerSigningKey         = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(Configuration["Tokens:Key"])),
                             ClockSkew                = TimeSpan.Zero,
                         };
                     });

            services.AddCors(options => {
                options.AddPolicy(MyAllowSpecificOrigins,
                                  builder => {
                                      builder.AllowAnyOrigin();
                                  });
            });

            services.AddMediatR(typeof(Startup));
            services.RegisterAutoMapper();

            services.Configure<SmtpSettings>(Configuration.GetSection("SmtpSettings"));
            services.AddSingleton<IMailer, Mailer>();
            services.AddSingleton<ISmtpServiceCustom, SmtpServiceCustom>();

            RegisterServices(services);
            ConfigureWorkflowService(services);
        }

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

            if (CurrentEnvironment.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseSwaggerUI(c => { c.SwaggerEndpoint("/swagger/v1/swagger.json", "Staging Api v1"); });
            }
            else
            {
                app.UseSwaggerUI(c => { c.SwaggerEndpoint("v1/swagger.json", "Production Api v1"); });
            }

            app.UseSerilogRequestLogging();

            app.UseStaticFiles();
            app.UseHttpActivities();
            app.UseHttpsRedirection();
            app.UseRouting();
            app.UseCors(MyAllowSpecificOrigins);
            app.UseAuthentication();
            app.UseAuthorization();
            app.UseHealthChecks("/health", new HealthCheckOptions { ResponseWriter = JsonResponseWriter });
            app.UseEndpoints(endpoints => { endpoints.MapControllers(); });
        }

        private static void RegisterServices(IServiceCollection services) => DependencyContainer.RegisterServices(services);

        private void ConfigureWorkflowService(IServiceCollection services)
        {
            // Elsa setup
        }

        private static Task JsonResponseWriter(HttpContext context, HealthReport report)
        {
            context.Response.ContentType = "application/json";
            return JsonSerializer.SerializeAsync(context.Response.Body, new { Status = report.Status.ToString() }, new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
        }

    }

API Controller

    [ApiController]
    [Route("api/[controller]")]
    [EnableCors("_myAllowSpecificOrigins")]
    public class AttachmentController : ControllerBase
    {
        private readonly ILogger<AttachmentController> _logger;
        private readonly IBudgetReleaseRequestService  _mainService;

        private readonly string _uploadFolderPath;

        public AttachmentController(IWebHostEnvironment hostingEnvironment, ILogger<AttachmentController> logger, IBudgetReleaseRequestService mainService)
        {
            _logger             = logger;
            _mainService        = mainService;
            _uploadFolderPath   = Path.Combine(hostingEnvironment.WebRootPath, "uploads");

            if (!Directory.Exists(_uploadFolderPath)) Directory.CreateDirectory(_uploadFolderPath);
        }

        [HttpPost]
        [Route("UploadFileTelerik")]
        public async Task<IActionResult> UploadFileTelerik(IFormFile brrAttachment)
        {
            if (brrAttachment == null) return new EmptyResult();

            try
            {
                var fileContent  = ContentDispositionHeaderValue.Parse(brrAttachment.ContentDisposition);

                if (fileContent.FileName != null)
                {
                    var fileName     = Path.GetFileName(fileContent.FileName.Trim('"'));
                    var physicalPath = Path.Combine(_uploadFolderPath, fileName);

                    await using var fileStream = new FileStream(physicalPath, FileMode.Create);
                    await brrAttachment.CopyToAsync(fileStream);
                }
            }
            catch
            {
                // Implement error handling here, this example merely indicates an upload failure.
                Response.StatusCode = 500;
                await Response.WriteAsync("some error message"); // custom error message
            }

            // Return an empty string message in this case
            return new EmptyResult();
        }

        [HttpPost]
        public ActionResult Remove(string fileToRemove)
        {
            if (fileToRemove == null) return new EmptyResult();

            try
            {
                var fileName     = Path.GetFileName(fileToRemove);
                var physicalPath = Path.Combine(_uploadFolderPath, fileName);

                if (System.IO.File.Exists(physicalPath))
                {
                    System.IO.File.Delete(physicalPath);
                }
            }
            catch
            {
                Response.StatusCode = 500;
                Response.WriteAsync("some error message");
            }

            return new EmptyResult();
        }

        #region Private

        private static string GetMimeTypeFromExtension(string fileDtoFileExtension)
        {
            return fileDtoFileExtension switch
            {
                ".txt"  => "text/plain",
                ".png"  => "image/png",
                ".jpeg" => "image/jpeg",
                ".jpg"  => "image/jpeg",
                ".doc"  => "application/vnd.ms-word",
                ".docx" => "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
                ".xls"  => "application/vnd.ms-excel",
                ".xlsx" => "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
                ".ppt"  => "application/vnd.ms-powerpoint",
                ".pptx" => "application/vnd.openxmlformats-officedocument.presentationml.presentation",
                ".pdf"  => "application/pdf",
                _       => "application/octet-stream"
            };
        }       

        #endregion

    }

Portal - Program.cs

    public class Program
    {
        public static void Main(string[] args)
        {
            try
            {
                using IHost host = CreateHostBuilder(args).Build();
                host.Run();
            }
            catch (Exception ex)
            {
                if (Log.Logger == null || Log.Logger.GetType().Name == "SilentLogger")
                {
                    Log.Logger = new LoggerConfiguration()
                        .MinimumLevel.Debug()
                        .WriteTo.Console()
                        .CreateLogger();
                }

                Log.Fatal(ex, "Host terminated unexpectedly");
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        public static IHostBuilder CreateHostBuilder(string[] args)
            => Host.CreateDefaultBuilder(args)
                   .UseServiceProviderFactory(new AutofacServiceProviderFactory(Register))
                   .ConfigureWebHostDefaults(webBuilder =>
                   {
                       webBuilder.UseStartup<Startup>()
                        .CaptureStartupErrors(true)
                        .ConfigureAppConfiguration(config => { config.AddJsonFile("appsettings.Local.json", optional: true); })
                        .UseSerilog((hostingContext, loggerConfiguration) => {
                            loggerConfiguration
                                .ReadFrom.Configuration(hostingContext.Configuration)
                                .Enrich.FromLogContext()
                                .Enrich.WithProperty("ApplicationName", typeof(Program).Assembly.GetName().Name)
                                .Enrich.WithProperty("Environment", hostingContext.HostingEnvironment);

                            #if DEBUG
                            loggerConfiguration.Enrich.WithProperty("DebuggerAttached", Debugger.IsAttached);
                            #endif
                        });
                   });

        private static void Register(ContainerBuilder builder) => builder.RegisterLogger(autowireProperties: true);

    }

Portal - Startup.cs

    public class Startup
    {
        private IWebHostEnvironment CurrentEnvironment { get; }
        private IConfiguration      Configuration      { get; }

        public Startup(IConfiguration configuration, IWebHostEnvironment env)
        {
            Configuration      = configuration;
            CurrentEnvironment = env;
        }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddLogging();
            services.AddRazorPages();

            services.AddResponseCompression(options => {
                options.EnableForHttps = true;
                options.MimeTypes = new[] {
                    "text/plain",
                    "text/css",
                    "application/javascript",
                    "text/html",
                    "application/xml",
                    "text/xml",
                    "application/json",
                    "text/json"
                };
            });

            if (CurrentEnvironment.IsDevelopment() || Configuration["DeveloperHacks:ExtraException"] == "1")
            {
                services.AddServerSideBlazor(o => o.DetailedErrors = true);
            }
            else
            {
                services.AddServerSideBlazor(o => o.DetailedErrors = true)
                    .AddHubOptions(options =>
                    {
                        options.ClientTimeoutInterval = TimeSpan.FromMinutes(10);
                        options.KeepAliveInterval = TimeSpan.FromSeconds(3);
                        options.HandshakeTimeout = TimeSpan.FromMinutes(10);
                    });
            }

            services.AddHeadElementHelper();
            services.AddBlazorDragDrop();
            services.AddDevExpressBlazor();
            services.AddTelerikBlazor();

            services.AddAuthentication(sharedOptions =>
                     {
                         sharedOptions.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                         sharedOptions.DefaultSignInScheme       = CookieAuthenticationDefaults.AuthenticationScheme;
                         sharedOptions.DefaultSignOutScheme      = CookieAuthenticationDefaults.AuthenticationScheme;
                         sharedOptions.DefaultChallengeScheme    = OpenIdConnectDefaults.AuthenticationScheme;
                     })
                    .AddOpenIdConnect(options =>
                     {
                         options.ClientId                                 = Configuration["Okta:ClientId"];
                         options.ClientSecret                             = Configuration["Okta:ClientSecret"];
                         options.Authority                                = Configuration["Okta:Issuer"];
                         options.CallbackPath                             = "/authorization-code/callback";
                         options.ResponseType                             = "code";
                         options.SaveTokens                               = true;
                         options.UseTokenLifetime                         = false;
                         options.GetClaimsFromUserInfoEndpoint            = true;
                         options.TokenValidationParameters.ValidateIssuer = false;
                         options.TokenValidationParameters.NameClaimType  = "name";
                         options.Scope.Add("openid");
                         options.Scope.Add("profile");
                     })
                    .AddCookie();

            services.AddMediatR(typeof(Startup));

            RegisterServices(services);
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                app.UseHsts();
            }

            app.UseSerilogRequestLogging();

            app.UseHeadElementServerPrerendering();

            app.UseHttpsRedirection();
            app.UseStaticFiles();

            app.UseRouting();

            app.UseAuthentication();
            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapBlazorHub();
                endpoints.MapFallbackToPage("/_Host");
            });
        }

        private void RegisterServices(IServiceCollection services)
        {
            var baseAddress = Configuration["ApiSetup:BaseAddress"]; // value: http://localhost:8082/

            services.AddHttpClient<ILookupService,           LookupService>          (client => { client.BaseAddress = new Uri(baseAddress); });
            services.AddHttpClient<IBusinessLookupService,   BusinessLookupService>  (client => { client.BaseAddress = new Uri(baseAddress); });
            services.AddHttpClient<IApiUserService,          ApiUserService>         (client => { client.BaseAddress = new Uri(baseAddress); });
            services.AddHttpClient<IRequestService,          RequestService>         (client => { client.BaseAddress = new Uri(baseAddress); });
            services.AddHttpClient<IResourceService,         ResourceService>        (client => { client.BaseAddress = new Uri(baseAddress); });
            services.AddHttpClient<IApproverTemplateService, ApproverTemplateService>(client => { client.BaseAddress = new Uri(baseAddress); });
            services.AddHttpClient<IAttachmentService,       AttachmentService>      (client => { client.BaseAddress = new Uri(baseAddress); });
        }

    }

Razor Page:

@page "/request-handle"
@page "/authorization-code/request-handle"

@page "/request-handle/{requestId:long}"
@page "/authorization-code/request-handle/{requestId:long}"

@page "/request-handle/{requestId:long}/{actorId}"
@page "/authorization-code/request-handle/{requestId:long}/{actorId}"

@page "/request-handle/{requestId:long}/{actionId:guid}"
@page "/authorization-code/request-handle/{requestId:long}/{actionId:guid}"

@inherits RequestHandleModel

@attribute [Authorize]

<PageHeader PageTitle="Release Request" AreaName="Request"></PageHeader>

@if (Model != null)
{
    <EditForm Context="_" OnValidSubmit="@HandleValidSubmit" EditContext="@EditContextCustom">
        <DataAnnotationsValidator />

        <DxFormLayout CssClass="dxFormLayoutHeaderStyle" CaptionPosition="CaptionPosition.Vertical">
            <DxFormLayoutItem ColSpanMd="12">
                <Template>
                    <ValidationSummary />
                </Template>
            </DxFormLayoutItem>

            <DxFormLayoutGroup Caption="Files" ColSpanMd="12">
                <DxFormLayoutItem Caption="" ColSpanMd="12" >
                    <Template >
                        <TelerikUpload SaveUrl="@FileUploaderUrlT"
                                       SaveField="brrAttachment" RemoveField="fileToRemove"
                                       AllowedExtensions="@(new List<string> {".jpg", ".jpeg", ".png", ".pdf", ".xlsx", ".xls", ".doc", ".docx"})"
                                       MaxFileSize="26214400" MinFileSize="1024">
                        </TelerikUpload>
                    </Template >
                </DxFormLayoutItem >
            </DxFormLayoutGroup>            
        </DxFormLayout>
    </EditForm>
}
else
{
    <p>@LoadingMessage</p>
}

<TelerikLoaderContainer Size="LoaderSize.Large" OverlayThemeColor="dark" LoaderPosition="LoaderPosition.Top" Text="Please wait..." LoaderType="LoaderType.ConvergingSpinner" Visible="@LoaderContainerVisible" />

<TelerikNotification Class="high-zindex" @ref="@Notification" AnimationType="AnimationType.Fade" AnimationDuration="300" />

Razor CodeBehind:

protected string FileUploaderUrlT = $"{ConfigHelper["ApiSetup:BaseAddress"]}api/Attachment/UploadFileTelerik";

// where ApiSetup:BaseAddress => // http://localhost:8082/

Through the portal, the registered clients work perfectly. However, the Upload Control fails at uploading a file:

Details: Preflight

Details: XHR

The request URL is perfectly correct. The API server is never hit. This setup works fine on my dev machines. It fails only when on staging or production. I cannot expose the API in any other way. I am looking at these two topics as I'm searching:

Upload component reports 'File failed to upload'

File Upload fails with error 404 in API call

Any hep will be appreciated.

Upload

answered on 08 May 2021

0 answers

276 views

Grid column sorting always uses Ascending

I have a Blazor grid and when I click the column heading it sorts the data Ascending. If I click the same column heading again, I'm expecting it to toggle to Descending, but the DataSourceRequest object always has Ascending regardless.

I see that the Telerik Demos work and I don't think I've done much different that those. I notice in the demos there is an arrow indicating which way the sort is going, in my grid no arrow icon is visible.

Grid

asked on 07 May 2021

1 answer

350 views

Different Grid column names when sorting/filtering

Hi,

I have inherited a data access layer which uses OrmLite and the database POCOs have been auto generated and it uses the actual database column names as the property names in the POCOs.

e.g. person_firstname, person_lastname etc.

public class PersonPoco
{
    public string person_firstname { get; set; }
    public string person_lastname { get; set; }
}

Then I'm using AutoMapper to map the POCOs to business objects which in turn are used as the data source for the Telerik Grid.

public class PersonBusinessClass
{
    public string Firstname { get; set; }
    public string Lastname { get; set; }
}

So in the Telerik Grid I would bind the columns as so:

<GridColumn Field="@(nameof(PersonBusinessClass.Firstname))" Title="First Name" />
<GridColumn Field="@(nameof(PersonBusinessClass.Lastname))" Title="Last Name" />

This causes an issue because when it comes to column filtering/sorting it uses the GridColumn Field value for the database column name which in my case is different, so I end up with errors e.g:

Invalid column name 'Firstname' as it should be 'person_firstname'.
Invalid column name 'Lastname' as it should be 'person_lastname'.

Is there a way to specify a different column name to use for filtering/sorting ?

Grid

answered on 07 May 2021

2 answers

1.4K+ views

Can DataSourceRequest be used in SQL query to add WHERE and ORDER BY clauses?

I have a Telerik Blazor Grid that I want to be able to use built in column filtering, column sort and paging.

There is a large amount of data to be displayed in the grid approx. 200,000+ rows hence the need for paging.

Ideally I want to do all the filtering, sorting and paging within the SQL query so that the SQL server will do the heavy lifting and only send back the required single page of data based on the applied filters, sorting and page number.

I have the Telerik.DataSource.DataSourceRequest object from the grid that contains all the grid state for currently applied filters, sorting and page number, is there a way I can use this object to generate my SQL query e.g. create the WHERE clause based on the filters and the ORDER BY clause based on the sorting and the page of data based on the page number?

I am using ServiceStack OrmLite which is returning an IQueryable from the SQL database then I'm using the extension method .ToDataSourceResultAsync(gridRequest);

I seems that the grid state in the gridRequest is happening in memory on the data sent back from the SQL query in the IQueryable object and not on the SQL database.

Is there a way I can do the filtering etc on the SQL database within the query rather than in memory?

Example:

            DataSourceResult processedData = null;

            using (var db = _dbConnectionFactory.Open())
            {
                Telerik.DataSource.DataSourceRequest gridRequest = dataSourceRequestWrapper.ToDataSourceRequest();

                var q = db.From<PersonTable>().Limit(0, 100);

                processedData = await db.Select(q).AsQueryable().ToDataSourceResultAsync(gridRequest);

                db.Close();
            }

            return processedData;

This produces a SQL query like:

SELECT
        TOP 100
        "PersonId", 
        "FirstName", 
        "Surname", 
        "Age" 
FROM
        "dbo"."PersonTable"

Ideally with using the extension method .ToDataSourceResultAsync(gridRequest); I would like to see the SQL query look more like based on the grid being sorted by the Age column descending and a single text filter applied to the Surname column to filter on 'Smith':

SELECT
        TOP 100
        "PersonId", 
        "FirstName", 
        "Surname", 
        "Age" 
FROM
        "dbo"."PersonTable"
WHERE
        "Surname" LIKE 'Smith%'
ORDER BY
        "Age" DESC

Grid

updated answer on 07 May 2021

1 answer

395 views

Tabstrip Horizontal Scrollbar shows no matter what

I have rearranged the row/col split in multiple ways. It seems no matter what I do the horizontal scrollbar always shows up. This only happens when the tabstrip has a "row/col" boostrap within it. If I don't put the row/col and just put a straight grid it properly doesn't not have a horizontal scrollbar. I even set the display initializer to wait until after the parameters have been set in the component. I tried the Kendo UI approach to force the tabstrip to not display the horizontal scrollbar, but I cannot seem to add an Id to the tabstrip.

Horizontal Scrollbar Issue

Grid Same Window Without Scrollbar

html_code_example

TabStrip

answered on 07 May 2021

2 answers

1.5K+ views

Serialize/DeSerialize DataSourceRequest and DataSourceResult

Hi,

I am using the CSLA framework with Blazor WebAssembly and am trying to send the Telerik.DataSource.DataSourceRequest from the Blazor Client using a Telerik Blazor Grid through to the CSLA DataPortal API endpoint on the Blazor Server.

Unfortunately the CSLA framework is unable to successfully serialize and de-serialize the Telerik.DataSource.DataSourceRequest object as is.

I tried creating a CSLA compatible wrapper so that i could use the built-in CSLA serialization, unfortunately i have hit an issue in the fact that CSLA only supports serialization of primative types (int, float, string, datetime, etc).

My discussion (https://github.com/MarimerLLC/csla/discussions/2268) on the CSLA repo suggests that I may need to serialize to a string or byte[] array.

The option I'm left with is to manually serialize the entire Telerik.DataSource.DataSourceRequest object as either a string or byte[] array by using either System.Text.Json or Newtonsoft.Json.

Then when the string or byte[] array is received by the CSLA DataPortal API endpoint I can manually de-serialize the parameter as a Telerik.DataSource.DataSourceRequest object.

Looking at the Telerik docs it appears that the Telerik.DataSource.DataSourceRequest object supports System.Text.Json out of the box but if I want to use Newtonsoft.Json then i might have to do some custom serialization, therefore my preference would be to use System.Text.Json.

How can I use System.Text.Json to serialize and de-serialize the Telerik.DataSource.DataSourceRequest object manually as my mode of transport to the CSLA DataPortal API endpoint doesn't use the native Blazor System.Text.Json serializer?

Grid

answered on 06 May 2021

0 answers

254 views

Pie Chart Horizontal Align

Hello. I have added a pie chart to my initial page (attached code sample and output). The pie chart is skewed to the right side of the page rather than being centered. How can I center it?

I've tried putting it in a row and column object but it just skews it right within those.

Thanks,

Debra

Charts

asked on 05 May 2021

1 answer

514 views

TelerikComboBox OnRead doesnt fire

I'm using TelerikComboBox and came across a problem that when I select a value from the drop-down list and the value changes, the method is not called.

<TelerikComboBox Data="@SuggestedEmployees"
TItem="@CompanyEmployeeDropDownInfoModel"
TValue="string"
TextField="Email"
ValueField="Email"
Placeholder="E-mail"
ClearButton="true"
Filterable="true"
Width="100%"
OnRead="@(OnEmailChanged)"
@bind-Value="@Email"
AllowCustom="true" >
<ItemTemplate Context="newContext">
<strong>@((newContext as CompanyEmployeeDropDownInfoModel).FirstName) @((newContext as CompanyEmployeeDropDownInfoModel).LastName) @((newContext as CompanyEmployeeDropDownInfoModel).PhoneNumber)</strong>
</ItemTemplate>
</TelerikComboBox>

At first, SuggestedEmployees is empty. When user inputs more than 3 symbols, we get list of employees and show it to user. Everything works fine, when user manually input symbols, but when user select target employee from list and email changes, nothing happened, OnRead method doesn't trigger. Any suggestion?

ComboBox

answered on 05 May 2021