Completed
Last Updated: 08 Sep 2026 06:12 by ADMIN
Release 2026 Q4 (Nov)

I am trying to look at the times 7pm - midnight.  But if I set the end time to midnight, I get an error that the end time has to be greater than the start time.  How do I set the timeline to show 7pm - midnight or 8pm - 2am?

I tried including the next date in the EndTime but the Scheduler does not take the date into consideration, it checks only the time portion.

Completed
Last Updated: 08 Sep 2026 06:11 by ADMIN
Release 2026 Q4 (Nov)

Bug report

Reproduction of the problem

(bug report only)
1. Run this example: https://blazorrepl.telerik.com/cUaBGOOZ34pkp6wB57
2. Inspect the MultiSelect’s input.
3. Click within the component’s input area, to open its popup.

The issue is also reproducible in the other dropdown components: https://blazorrepl.telerik.com/GUurGmvw32oPqGYu03

Current behavior

(optional)
When the dropdown opens, an aria-controls attribute is applied to the MultiSelect’s input. Its value does not match any existing DOM element.

Expected/desired behavior

The value of the aria-controls attribute should point at an existing element (e.g., the popup’s list element: https://www.telerik.com/blazor-ui/documentation/components/multiselect/accessibility/wai-aria-support#multiselect-wrapping-element ). But in this case the MultiSelect is not bound to data and a list element is not rendered in the popup.

Environment

  • Kendo/Telerik version: 14.1.0
  • jQuery version:
  • Browser: [all ]
Completed
Last Updated: 04 Sep 2026 09:45 by ADMIN
Release 2026 Q4 (Nov)
When configuring fields in the PivotGrid Configurator, selected fields that are not assigned to Rows, Columns, or Measures get unchecked after clicking the "Apply" button. This results in users losing their field selections.
Completed
Last Updated: 03 Sep 2026 06:14 by ADMIN
Created by: Andreas
Comments: 4
Category: UI for Blazor
Type: Bug Report
3

We have a Blazor project that normally takes 20 seconds to build.

But after upgrading Telerik.Licensing from 1.8.2 to 1.9.0/1 the build takes about 60 seconds.

First we upgraded all telerik references with this effect. Now we downgraded all to the version that is supported by 1.8.2.

In the project, the only change I make is to change the version from 1.8.2 to 1.9.0 or later, then the build goes from 20 seconds to 60 seconds, no other changes made...

I have tried Rebuild, Restarts etc...

In the build detailed output, it is the csc command that takes longer times.

Completed
Last Updated: 01 Sep 2026 06:46 by ADMIN
Release 2026 Q4 (Nov)
Created by: Indra
Comments: 2
Category: DropDownList
Type: Bug Report
8

I have a cascading DropDownList scenario with virtual scrolling. When the first DropDownList changes value, the second one should reset its scrollbar to the top, because it now contains new data. This doesn't happen.

Here is a REPL test page.

===

ADMIN EDIT

===

As a workaround for the time being, you may track when the value is changed in the parent DropDownList to dispose and re-initialize the child DropDownList.

Here is an example: https://blazorrepl.telerik.com/mdafHabk585ZtzyV54.

Completed
Last Updated: 31 Aug 2026 05:17 by ADMIN
Release 2026 Q4 (Nov)

Description

Appointment editing does not work on Chrome for mobile (Android).

Steps To Reproduce

Run the following demo in the Chrome for mobile browser, on a mobile device with Android : https://demos.telerik.com/blazor-ui/scheduler/appointment-editing

  1. Attempt to edit an appointment by double tapping it

Actual Behavior

The popup editor does not show up.

Expected Behavior

The popup editor shows up.

Browser

Chrome

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

No response

Completed
Last Updated: 28 Aug 2026 14:08 by ADMIN
Release 2026 Q4 (Nov)
Created by: Hannes
Comments: 0
Category: UI for Blazor
Type: Feature Request
1

The documented lazy loading scenario is not compatible with Telerik UI for Blazor 15.0.0, because of the new ITelerikIconService. Unlike the ITelerikStringLocalizer, there is no alternative way to register this icon service outside Program.cs.

Completed
Last Updated: 28 Aug 2026 11:23 by ADMIN
Release 2026 Q4 (Nov)
Created by: Sam
Comments: 0
Category: DropDownList
Type: Bug Report
0

Bug report

Reproduction of the problem

(bug report only)
The DropDownList (and other dropdown components - ComboBox, MultiColumnComboBox, etc.) render a redundant attribute in their popup ul element: aria-live="polite". Listboxes that use aria-activedescendant for tracking should not also announce via a live region — this creates duplicate/conflicting announcements by screen readers.

Current behavior

(optional)
The popup’s ul element renders aria-live=”polite”.

Expected/desired behavior

Either render aria-live=”off” (e.g., Kendo Angular DropDownList), or don’t render the aria-live attribute at all.

Environment

  • Kendo/Telerik version:
  • jQuery version: x.y
  • Browser: [all]
Completed
Last Updated: 28 Aug 2026 09:32 by ADMIN
Release 2026 Q4 (Nov)
Created by: Emma
Comments: 5
Category: Scheduler
Type: Bug Report
2

I have been having issues adding the month view to a Telerik Blazor scheduler component, when there is grouping. It gives a null reference error any time I try to switch to the month view. I also tried it using the available demo for grouping in Telerik REPL, the only difference I found between my code and the demo was that I had used the ItemsPerSlot parameter.  I added this to the demo, and was able to reproduce the error I was seeing, and I have attached the console output from the REPL demo. I believe there is either a bug with the ItemsPerSlot being used in conjunction with grouping on a scheduler component, or some instruction missing from how to set it up properly to prevent this null reference issue. 

Changed code:

<SchedulerMonthView ItemsPerSlot="5"></SchedulerMonthView>

Demo used:

Blazor Scheduler (Event Calendar) Demos - Grouping | Telerik UI for Blazor

 


Completed
Last Updated: 27 Aug 2026 10:21 by ADMIN
Release 2026 Q2
Created by: Marc
Comments: 14
Category: PDFViewer
Type: Feature Request
8
I want to be able to pinch the document in the PDFViewer and zoom it. Similar to how PDF is fluently zoomed in and out on pinch if opened in a web browser.
Completed
Last Updated: 25 Aug 2026 11:19 by ADMIN
Release 2026 15.1.0 (Sep)
Created by: laboratorysystemdevelopment
Comments: 0
Category: ComboBox
Type: Bug Report
2

The ComboBox and MultiColumnComboBox retain their TextField string label when the value is cleared programmatically. The issue starts to occur in version 14.1.0.

Test Page:

<ul>
    <li><code>AutoCompleteValue</code>: @AutoCompleteValue</li>
    <li><code>SelectedValue</code>: @SelectedValue</li>
    <li><code>SelectedValueNullable</code>: @SelectedValueNullable</li>
    <li><code>MultiSelectValues</code>: @string.Join(", ", MultiSelectValues)</li>
</ul>

<p>
    <TelerikButton OnClick="@(() => {
        AutoCompleteValue = string.Empty;
        SelectedValue = default;
        SelectedValueNullable = default;
        MultiSelectValues = new();
    })">Clear Values</TelerikButton>
</p>

<TelerikAutoComplete Data="@ListItems"
                     @bind-Value="@AutoCompleteValue"
                     ValueField="@nameof(ListItem.Text)"
                     Placeholder="Select Item"
                     ShowClearButton="true"
                     Width="300px" />

<br /><br />

<TelerikComboBox Data="@ListItems"
                 @bind-Value="@SelectedValue"
                 TextField="@nameof(ListItem.Text)"
                 ValueField="@nameof(ListItem.Id)"
                 Placeholder="Select Item"
                 ShowClearButton="true"
                 Width="300px" />

<TelerikComboBox Data="@ListItems"
                 @bind-Value="@SelectedValueNullable"
                 TextField="@nameof(ListItem.Text)"
                 ValueField="@nameof(ListItem.Id)"
                 Placeholder="Select Item"
                 ShowClearButton="true"
                 Width="300px" />


<br /><br />

<TelerikDropDownList Data="@ListItems"
                     @bind-Value="@SelectedValue"
                     TextField="@nameof(ListItem.Text)"
                     ValueField="@nameof(ListItem.Id)"
                     DefaultText="Select Item"
                     Width="300px" />

<TelerikDropDownList Data="@ListItems"
                     @bind-Value="@SelectedValueNullable"
                     TextField="@nameof(ListItem.Text)"
                     ValueField="@nameof(ListItem.Id)"
                     DefaultText="Select Item"
                     Width="300px" />

<br /><br />

<TelerikMultiColumnComboBox Data="@ListItems"
                            @bind-Value="@SelectedValue"
                            TextField="@nameof(ListItem.Text)"
                            ValueField="@nameof(ListItem.Id)"
                            Placeholder="Select Item"
                            ShowClearButton="true"
                            Width="300px">
    <MultiColumnComboBoxColumns>
        <MultiColumnComboBoxColumn Field="@nameof(ListItem.Id)" />
        <MultiColumnComboBoxColumn Field="@nameof(ListItem.Text)" />
    </MultiColumnComboBoxColumns>
</TelerikMultiColumnComboBox>

<TelerikMultiColumnComboBox Data="@ListItems"
                            @bind-Value="@SelectedValueNullable"
                            TextField="@nameof(ListItem.Text)"
                            ValueField="@nameof(ListItem.Id)"
                            Placeholder="Select Item"
                            ShowClearButton="true"
                            Width="300px">
    <MultiColumnComboBoxColumns>
        <MultiColumnComboBoxColumn Field="@nameof(ListItem.Id)" />
        <MultiColumnComboBoxColumn Field="@nameof(ListItem.Text)" />
    </MultiColumnComboBoxColumns>
</TelerikMultiColumnComboBox>

<br /><br />

<TelerikMultiSelect Data="@ListItems"
                    @bind-Value="@MultiSelectValues"
                    TextField="@nameof(ListItem.Text)"
                    ValueField="@nameof(ListItem.Id)"
                    Placeholder="Select Items"
                    ShowArrowButton="true"
                    ShowClearButton="true"
                    AutoClose="false"
                    Width="600px" />

@code {
    private List<ListItem> ListItems { get; set; } = new();

    private int SelectedValue { get; set; } = 3;
    private int? SelectedValueNullable { get; set; } = 3;
    private string AutoCompleteValue { get; set; } = "Item 3";

    private List<int> MultiSelectValues { get; set; } = new() { 3, 5 };

    protected override void OnInitialized()
    {
        ListItems = new List<ListItem>();

        for (int i = 1; i <= 24; i++)
        {
            ListItems.Add(new ListItem()
            {
                Id = i,
                Text = $"Item {i}"
            });
        }

        base.OnInitialized();
    }

    public class ListItem
    {
        public int Id { get; set; }
        public string Text { get; set; } = string.Empty;
    }
}

Completed
Last Updated: 25 Aug 2026 08:02 by ADMIN
Release 2026 15.1.0 (Aug)

At the moment, typing with the keyboard focuses the first item that starts with the last letter you pressed. To focus the next one you should either use Down Arrow, or type the same letter again.

I would like it to behave like the regular <select> or like a combo box with filtering - typing characters quickly should highlight the item that begins with all those characters, instead of using only the first letter.

=== 

Admit edit: some keywords for better findability: DropDownList keyboard search filter accessibility

Completed
Last Updated: 25 Aug 2026 07:58 by ADMIN
Release 2026 15.1.0 (Aug)

Bug report

Reproduction of the problem

(bug report only)
Regression introduced in 13.0.0.
1. Run this example: https://blazorrepl.telerik.com/wUuSGClv00orFeRm59

Current behavior

(optional)
The Size, Rounded, FillMode parameters are ignored.

Expected/desired behavior

The parameter values should apply and change the appearance of the SearchBox.

Environment

  • Browser: [all ]
Completed
Last Updated: 20 Aug 2026 10:38 by ADMIN
Release 2025 Q4 (12.11.2025)
Created by: Michael Nikolai
Comments: 0
Category: Installer and VS Extensions
Type: Feature Request
1
Add support for .NET 9 in the Blazor Convert Project.
Completed
Last Updated: 20 Aug 2026 10:10 by ADMIN
Release 2026 14.1.0 (Jul)

I am resetting the Grid State by calling Grid.SetState(null). This doesn't reset ColumnState<T>.Locked boolean to false and the columns remain locked.

---

ADMIN EDIT

---

A possible workaround for the time being is to additionally loop through the ColumnStates collection of the State and set the Locked property to false for each column.

Example: https://blazorrepl.telerik.com/QTYmkpvb49c6CPxa42

Completed
Last Updated: 20 Aug 2026 09:43 by ADMIN
Release 2026 14.1.0 (Jul)

When Adaptive = true, changing the collection of buttons seems to "break" the adaptive calculation. The Toolbar fails to determine what are the buttons to show in the main element and what are the buttons to show in the pop-up: https://blazorrepl.telerik.com/wSubOWlS08FLz7aZ54

===

ADMIN EDIT

For the time being, a possible workaround is to force the component to refresh when you change the buttons. For that purpose, you can dispose it and re-initialize it after some delay. Here is a runnable sample: https://blazorrepl.telerik.com/QIOFuCvS400o5tfL34.

Completed
Last Updated: 18 Aug 2026 14:33 by ADMIN
Release 2026 14.1.0 (Jul)

I've determined that the TelerikDateTimePicker does not work properly on mobile devices when using AdaptiveMode.Auto. Attached are videos of the component's behaviour in both modes (None, and Auto).

Immediately after interacting with the fullscreen popup of the datepicker, I see this error in the console:

RAW:
telerik-blazor.js:50 Uncaught TypeError: r.isParent is not a function

    at p.isChild (telerik-blazor.js:50:1362352)
    at f.closePopup (telerik-blazor.js:50:1398427)
    at HTMLHtmlElement.onMouseDown (telerik-blazor.js:50:1397246)

Code:

@using Telerik.Blazor.Components
@using Telerik.Blazor

<TelerikFloatingLabel Text="Date & Time">
    <TelerikDateTimePicker Id="date-picker" @bind-Value="MyFormModel.Date" Max="@DateTime.Now.AddDays(1)"
                           Format="@DATE_FORMAT" AdaptiveMode="AdaptiveMode.Auto"
                           FillMode="@Telerik.Blazor.ThemeConstants.DateTimePicker.FillMode.Flat" />
</TelerikFloatingLabel>
@code {
    private FormModel MyFormModel { get; set; } = new FormModel();
    private const string DATE_FORMAT = "MM/dd/yyyy HH:mm";

    private class FormModel
    {
        public DateTime Date { get; set; }
    }
}

Notes:
- If we remove all of the parent components wrapping the DatePicker, it seems to function properly, but the errors remain in the console. This isn't a solution, however.

Completed
Last Updated: 18 Aug 2026 13:21 by ADMIN
Release 2026 Q2

I am using ComboBox and I want to be able to filter by two model properties. To achieve this I have implemented custom filtering through the OnRead event. Additionally, I am ordering the data to first match the results from the one property, which also is used for the TextField, and after that to match the results from the other property. However, when the results are only from the match of the second property, there is no focus.

Here is a REPL example https://blazorrepl.telerik.com/wyaMQhEN108axXJ036 

Steps to reproduce the issue:

Type "a": "Value test - ano" has the focus (the first option in the list)

Type "an": "Value test - ano" receives the focus (the first option in the list)

Type "ano": "Value test - ano" receives the focus (the first option in the list)

Type "anot": no item has focus despite the results being only "Another Value - val"

Completed
Last Updated: 18 Aug 2026 11:37 by ADMIN
Release 2026 Q2
Enter "01" in the "hour" section. You’ll notice that the cursor does not automatically move to the next section until another digit is entered.
Completed
Last Updated: 18 Aug 2026 11:34 by ADMIN
Release 2026 Q2

When SchedulerGroupOrientation is set to vertical, increasing the height of the `SchedulerResourceGroupHeader` breaks the rendering of the Scheduler cells, which causes misalignment of the appointments. In my scenario, I want to have a Button and an Icon in the group header cell.

Reproduction example: https://blazorrepl.telerik.com/wJElGYvF02XSsN6j42

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