Description

Regression introduced in v9.0.0.

Initial binding to a property works, but when either the RemoveAttributes or the StripTags parameter is set, on changing the Editor value, two-way binding does not work and the new Editor value is not reflected in the property value.

Potentially related to #3887

Steps To Reproduce

1. Run the following example:

<p role="status">Current Editor value: @CurrentEditorText</p>

<TelerikEditor @bind-Value="@CurrentEditorText">
    <EditorSettings>
        <EditorPasteSettings ConvertMsLists="@true"
                             RemoveAllAttributes="@true"
                             RemoveAttributes="@(new List<string> { "lang" })"
                             RemoveHtmlComments="@true"
                             RemoveMsClasses="@true"
                             RemoveMsStyles="@true"
                             StripTags="@( new List<string> { "h1" })">
        </EditorPasteSettings>
    </EditorSettings>
</TelerikEditor>


@code {
    private string CurrentEditorText { get; set; } = @"<strong>initial</strong><span>value</span>";

    public List<string> RemoveAttributes { get; set; } = new List<string>() { "data-id" };

    public List<string> StripTags { get; set; } = new List<string>() { "font" };
}

2. Type in the Editor's content area

Actual Behavior

The CurrentEditorText property value is not updated.

Expected Behavior

The CurrentEditorText property value is updated.

Browser

All

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

8.1.1

Hi,

There's a bug in TelerikComboBox. If you have ScrollMode.Virtual enabled, together with ShowClearButton enabled you can end up in a state where "No data" is shown after opening the drop down.

Steps to reproduce.

- Use a TelerikComboBox in your view. 

- Assign its Data Parameter a List containing 1000 items. Set PageSize paramter to 10.

- Open the ComboBox list, scroll to bottom and select an item.

- Press the ClearButton to deselect the item.

- Preform an action that resizes the List passed to the Data parameter to 10 items.

- Open the ComboBox list again, not it will sais No data instead of showing the 10 items.

As far as i can tell this happens because Skip property (TelerikSelectBase) is not reset in the ResetValue() method.

This does not happen when you manually clear the field, becouse that calls ChangeValue, wich in turn calls Filter(), and filter does this:

if (IsVirtualScrollable)
{
         Skip = 0;
}

The Grid in-cell editor will not close if the user selects content in more than one cell in the component. This can lead to problems related to uncommitted new values if the user "forgets" to confirm their edits and navigates away.

https://demos.telerik.com/blazor-ui/grid/editing-incell

Observe the inconsistency:

• While in edit mode, select the contents of another single cell. The cell in edit mode will close.
• While in edit mode, drag the mouse to select multiple other cells. The cell in edit mode will not close.

===

A possible workaround is to use @onfocusout and the Grid state to detect the problematic behavior and close the edit cell programmatically:

https://blazorrepl.telerik.com/cJFbQIFE08y9GN8A02

• Create a ListView
• Create a TimePicker within the ListView
• Set the Adaptive Mode on the TimePicker to Auto (This is key, if this property is removed it works)
• Run the page and switch to a mobile view format within the browse

@page "/test-timepicker-listview"

<h3>TimePicker in ListView Test</h3>

<TelerikListView Data="@TestItems" Width="100%">
    <HeaderTemplate>
        <div style="padding: 10px; background-color: #f0f0f0; font-weight: bold;">
            Time Entry Items
        </div>
    </HeaderTemplate>
    <Template>
        <div style="padding: 15px; border-bottom: 1px solid #ddd;">
            <div style="margin-bottom: 10px;">
                <strong>Item:</strong> @context.Name
            </div>
            <div style="display: flex; align-items: center; gap: 10px;">
                <label>Start Time:</label>
                <TelerikTimePicker @bind-Value="@context.StartTime" Format="hh:mm tt" Width="150px"
                    AdaptiveMode="AdaptiveMode.Auto" />
            </div>
            <div style="display: flex; align-items: center; gap: 10px; margin-top: 10px;">
                <label>End Time:</label>
                <TelerikTimePicker @bind-Value="@context.EndTime" Format="hh:mm tt" Width="150px"
                    AdaptiveMode="AdaptiveMode.Auto" />
            </div>
        </div>
    </Template>
</TelerikListView>

@code {
    private List<TimeEntryItem> TestItems { get; set; } = new();

    protected override void OnInitialized()
    {
        // Initialize with some test data
        TestItems = new List<TimeEntryItem>
{
new TimeEntryItem { Id = 1, Name = "Morning Shift", StartTime = new DateTime(2025, 11, 18, 8, 0, 0), EndTime = new
DateTime(2025, 11, 18, 12, 0, 0) },
};
    }

    public class TimeEntryItem
    {
        public int Id { get; set; }
        public string Name { get; set; } = string.Empty;
        public DateTime StartTime { get; set; }
        public DateTime EndTime { get; set; }
    }
}

The value in a numeric textbox cannot be changed for negative numerbes unless you erase all the text and restart.

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.