Description

When going fast over the Grid rows with the mouse cursor, the rows are highlighted after a delay. The delay is more noticeable on higher resolutions (2560x1440 or higher).

Steps To Reproduce

1. Hover the first Grid row and move the mouse cursor towards the last row (or vice versa).

Actual Behavior

In the app that targets .NET10 the row hover styles are applied with a delay, whereas in the app that targets .NET8 the hover styles are applied as soon as the mouse enters the boundaries of a row.

Expected Behavior

Similar performance in applying hover-related styles.

Browser

All

Last working version of Telerik UI for Blazor (if regression)

No response

Hi,

When submitting a chat message using the Chat component, it is possible to lose recently entered text.

I believe this is because:

1. The TextArea in the Chat component has a debounce delay (the default 150ms delay)
2. Pressing enter (or clicking the send button) fires the SendMessageAsync method instantly
3. SendMessageAsync uses the last text received from the TextArea, but this can be up to 150ms behind due to the debounce delay

This is reproducible on the Chat component documentation page, https://www.telerik.com/blazor-ui/documentation/components/chat/overview#creating-blazor-chat:

1. Type in some text
2. Wait 150ms (i.e., wait for the button to enable, otherwise the enter keypress and button clicks are ignored)
3. Type some more text and quickly hit enter (or press the button)

Depending on the timing, the last few characters/words will be lost and not included in the message.

I encounter this issue in version 11 with server side rendering, but the documentation page appears to be using version 12 with web assembly.

Thanks,

Craig

After upgrading to 12.0.0, the Content does not change when clicking tabs. I always see the Content of the first tab.

My project targets .net8.

In the case of a sorted column, NVDA is not narrating the correct column name and narrating the incorrect Roles for the column headers.

In the case of an unsorted column, NVDA is narrating the column name twice and repeating the information.

The appointments are not on the right position in the scheduler, on day and week views.
They appear slight downwards. See screenshot from your demo pages.

The first appoinments are right. Later in time the appointments are off.

This is true for all themes.

Tested on Windows 11, with Brave, Firefox and Edge.

Best regards

Daniel Hüttenberger

When using the OnClick event on a DropDownButtonItem, the MouseEventArgs parameter is always null. However, if the OnClick event is used on the main TelerikDropDownButton component, the MouseEventArgs works correctly.

REPL reproduction - https://blazorrepl.telerik.com/mfYdbbPQ37jhZlMq47

We are experiencing an issue where the ExportToPdfAsync() method on TelerikGrid is returning Excel data (XLSX format) instead of PDF data. This is causing MIME type errors when trying to process the exported data as a PDF.

===ADMIN EDIT===

Workaround

In the meantime, a possible workaround would be to use the document processing library (make sure the correct packages are installed for it) and import the xlsx file to a workbook, and then export the workbook to PDF. Here is an improvised example that demonstrates this by saving the file in your wwwroot folder as a pdf.

@inject IWebHostEnvironment HostingEnvironment

<TelerikGrid Data="@bookList" Height="75svh" Resizable="true" Sortable="true" Pageable="true" PageSize="15"
             FilterMode="@GridFilterMode.FilterMenu" SelectionMode="@GridSelectionMode.Multiple"
             SelectedItems="@SelectedBooks" @ref="@BookGrid"
             SelectedItemsChanged="@((IEnumerable<BookInfo> sel) => OnRowSelect(sel))">
    <GridToolBarTemplate>
        <TelerikButton OnClick="@GenerateReport">Generate PDF</TelerikButton>
    </GridToolBarTemplate>
    <GridExport>
        <GridPdfExport AllPages="true" PageOrientation="GridPdfExportPageOrientation.Landscape"
                       PaperSize="GridPdfExportPaperSize.A3" />
    </GridExport>
    <GridColumns>
        <GridCheckboxColumn CheckBoxOnlySelection="true"></GridCheckboxColumn>
        <GridColumn Field="ISBN">
            <HeaderTemplate><b>ISBN</b></HeaderTemplate>
        </GridColumn>
        <GridColumn Field="Author">
            <HeaderTemplate><b>Author</b></HeaderTemplate>
        </GridColumn>
        <GridColumn Field="Title">
            <HeaderTemplate><b>Title</b></HeaderTemplate>
        </GridColumn>
        <GridColumn Field="Genre">
            <HeaderTemplate><b>Genre</b></HeaderTemplate>
        </GridColumn>
        <GridColumn Field="PublishedYear">
            <HeaderTemplate><b>Year</b></HeaderTemplate>
        </GridColumn>
        <GridColumn Field="CopiesAvailable">
            <HeaderTemplate><b>Copies</b></HeaderTemplate>
        </GridColumn>
    </GridColumns>
</TelerikGrid>

@code {
    private async Task GenerateReport()
    {
        isLoading = true;
        var pdfStream = await BookGrid.ExportToPdfAsync();

        // The stream is actually XLSX, so convert it to PDF
        using var ms = new MemoryStream(pdfStream.ToArray());

        var xlsxProvider = new Telerik.Windows.Documents.Spreadsheet.FormatProviders.OpenXml.Xlsx.XlsxFormatProvider();
        var workbook = xlsxProvider.Import(ms);

        var rootPath = HostingEnvironment.WebRootPath;
        var saveLocation = Path.Combine(rootPath, "LibraryBooks.pdf");
        var pdfProvider = new Telerik.Windows.Documents.Spreadsheet.FormatProviders.Pdf.PdfFormatProvider();
        using (var fileStream = new FileStream(saveLocation, FileMode.Create))
        {
            pdfProvider.Export(workbook, fileStream);
        }
    }

    public class BookInfo
    {
        public string ISBN { get; set; }
        public string Author { get; set; }
        public string Title { get; set; }
        public string Genre { get; set; }
        public int PublishedYear { get; set; }
        public int CopiesAvailable { get; set; }
    }

    private List<BookInfo> bookList = new()
    {
        new BookInfo { ISBN = "978-0451524935", Author = "George Orwell", Title = "1984", Genre = "Dystopian", PublishedYear = 1949, CopiesAvailable = 4 },
        new BookInfo { ISBN = "978-0439139601", Author = "J.K. Rowling", Title = "Harry Potter and the Goblet of Fire", Genre = "Fantasy", PublishedYear = 2000, CopiesAvailable = 7 },
        new BookInfo { ISBN = "978-0140449266", Author = "Homer", Title = "The Odyssey", Genre = "Epic Poetry", PublishedYear = -800, CopiesAvailable = 2 }
    };

    private TelerikGrid<BookInfo> BookGrid;
    private List<BookInfo> SelectedBooks = new();
    private bool isLoading = false;

    private void OnRowSelect(IEnumerable<BookInfo> selected)
    {
        SelectedBooks = selected.ToList();
    }
}

I was hoping to use the new AllowCustom feature to let users name a few areas, save those names in the backend and later show them as preselected when the user comes back so they don't have to retype the names every time they do an operation. But alas, the AllowCustom seems to only allow preselecting from what's in the Data list of values.

So code like below doesn't actually show a chip for Rome even though it's preselected. There is a workaround of setting the Data property to a list that contains the custom values I need preselected, but it feels clumsy and with the custom values I feel Multiselect should also check the selected values list for chips to render.

<TelerikMultiSelect 
   @bind-Value="@SelectedCities"
   TItem="string" TValue="string"
   AllowCustom="true"                   
   Width="400px">
</TelerikMultiSelect>

<span>Selected: @SelectedCities.Count</span>

@code {
    private List<string> SelectedCities { get; set; } = new() {"Rome"};
}

A Grid component with GridToolBar increases memory usage due to event handler leaks, specifically associated with the GridToolBar and ColumnMenuToolBar.

Description

Regression introduced in version 10.0.0. The TimePicker's value must be null initially and the system time should be at least 55 minutes past the hour (e.g., 13:55 or 14:57).

Steps To Reproduce

1. Set the time on your machine to 55 past the hour, e.g., 13:55.
2. Open a new instance of Chrome and navigate to https://blazorrepl.telerik.com/mpFEYBOi12ooskUK19
3. Run the example
4. Click in the clock icon in the picker, to open its dropdown.
5. Click the Set button.

Actual Behavior

The following error is thrown:

Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
Unhandled exception rendering component: Hour, Minute, and Second parameters describe an un-representable DateTime.
System.ArgumentOutOfRangeException: Hour, Minute, and Second parameters describe an un-representable DateTime.

Expected Behavior

No error is thrown and the time that is automatically highlighted in the dropdown is set, after clicking the "Set" button.

Browser

All

Last working version of Telerik UI for Blazor (if regression)

9.1.0

Hello,

I’ve run into a reproducible issue with the Blazor Grid in Adaptive mode. After the grid adapts to a smaller container and then the container is expanded again, the data rows scroll while the header remains fixed, so the header and data become detached.

I’m attaching three screenshots that show the sequence:

1. 01.png — Grid in normal (non-adaptive) state.
2. 02.png — After shrinking the container until the grid switches to Adaptive.
3. 03.png — After expanding the container again; scrolling the grid shows the header no longer tracks with the data.

Steps to reproduce

1. Open the REPL I’m providing: [REPL link here].
2. Shrink the container (e.g., resize the pane/window) until the grid switches to Adaptive mode.
3. Expand the container back to a larger width so the grid returns to its standard table view.
4. Scroll the grid using the scrollbar/slider: the body content scrolls, but the header stays static and is no longer aligned with the data.

Expected behavior

Header and data remain synchronized—when the grid is scrolled horizontally/vertically, both header and rows should scroll together.

Actual behavior

After returning from Adaptive to the standard layout, the header does not move with the rows when scrolling; it appears “detached”.

Notes

• I did not add any custom CSS related to header/body layout in the demo.
• I haven’t identified a reliable workaround yet.

Please let me know if this is a known issue, if there’s a fix/workaround, or if you need any additional details.

REPL: https://blazorrepl.telerik.com/cfkXlLFd30pGcc6i09?_gl=1*4qgvh1*_gcl_au*OTEyODU4MzMuMTc1NzU3NDk1Ng..*_ga*MTc1OTQ2OTkzNy4xNzU3NTc0ODY4*_ga_9JSNBCSF54*czE3NTk5OTkxMjgkbzEwJGcxJHQxNzYwMDAxNTkwJGo1MyRsMCRoMA..

Description

After the user selects a color in the color tools, the popup does not close automatically. The user has to click on the Editor's toolbar for the popup to close.

Steps To Reproduce

1. Run this example: https://blazorrepl.telerik.com/GTYXPsFv59loxN7v37
2. Highlight a word in the Editor's content and use the color tools. Change either the text color or the background color.

Actual Behavior

After selecting a color, the color tool's popup remains open.

Expected Behavior

The color tool's popup closes.

Browser

All

Last working version of Telerik UI for Blazor (if regression)

No response