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.

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;
    }
}

The PDF Viewer may open certain files as empty, even though they have text and image content.

The issue occurs in version 14.0.0.

(Test file available in private ticket 1718294)

Bug report

Reproduction of the problem

(bug report only)

1. Run this example: https://blazorrepl.telerik.com/mUOqQflm56D4xScx54
2. Select a font in the FontFamily dropdown.
3. Click the UnorderedList tool in the Editor’s toolbar.
4. A bullet is added and the FontFamily tool loses its value.
5. Click right after the added bullet.
6. Once again select a font in the FontFamily drodown.
7. Click the UnorderedList tool in the Editor’s toolbar to remove the bullet.
8. The FontFamily tool loses its value.

Current behavior

(optional)
Provide additional information if the steps for reproducing the faulty behavior are not sufficient to describe the issue.

Expected/desired behavior

The FontFamily tool should keep its value when an unordered list is added/removed.

Environment

• Kendo/Telerik version: 14.0.0
• Browser: [all]

Bug report

Reproduction of the problem

(bug report only)
Environment

• Version 15.1.0
• Blazor Server, .NET 10
• Chromium (Chrome and Playwright headless)

TabStrip Tab is never destroyed
Components/TabStrip/Tab.razor.cs registers each tab with initTabStripTab in OnAfterRenderAsync. Its Dispose() only releases the DotNetObjectReference; it never calls InvokeDisposeAsync(). The JS Tab.destroy() method is therefore never called, and TabStrip.destroy() does not destroy its child tabs. Every tab stays in window.TelerikBlazor._instances with its detached <li class="k-tabstrip-item">, which again keeps the disposed page reachable.

1. Create two routable pages. PageA has TabStrip with 3 tabs. PageB is empty.
2. Open PageA, then navigate to PageB with the in-app router (no full reload).
3. Run this in the browser console:

Object.entries(TelerikBlazor._instances)
     .filter(([k, i]) => i && i.element && !i.element.isConnected)
     .map(([k, i]) => k + ' / ' + i.constructor.name)

Sample project attached.

TelerikBlazorApp1.zip

Current behavior

(optional)
One entry per TabStrip tab is returned, all pointing at detached elements. Each pageA -> pageB round trip adds more, and the detached DOM is never released.

Expected/desired behavior

An empty array is returned. PageA's components were disposed, so their JS instances should have been destroyed.

Workaround

After each navigation, we destroy and remove any registered instance whose element is no longer in the page:

const instances = window.TelerikBlazor && window.TelerikBlazor._instances;
   for (const key of Object.keys(instances || {})) {
       const i = instances[key];
       if (i && i.element && !i.element.isConnected) {
           try { i.destroy && i.destroy(); } catch (e) { }
           delete instances[key];
       }
   }

Suggested Fix

1. In Tab.Dispose(), call InvokeDisposeAsync() before base.Dispose(), as TelerikTabStrip.Dispose() does.

Environment

• Kendo/Telerik version:
• Browser: [Chrome XX , Firefox]

Bug report

Reproduction of the problem

Environment

• Version 15.1.0
• Blazor Server, .NET 10
• Chromium (Chrome and Playwright headless)

Grid ColumnDraggable is never destroyed
In Components/Common/Grid/Rows/TableHeaderRow.cs, Dispose() calls base.Dispose() first, which sets IsDisposed = true. It then calls DestroyColumnDraggable(), which uses InvokeAsync<object>. That method returns early when IsDisposed is true (BaseComponent.InvokeAsync<T>), so destroyColumnDraggable is never sent to the browser. DestroyColumnReorderable() and DestroyColumnResizable() work because they use InvokeVoidAsync, which has no such check.

As a result, every grid with Reorderable="true" or Groupable="true" leaves "<dataId>-telerik-ColumnDraggable" in window.TelerikBlazor._instances. Its draggable.element (the grid's .k-grid-header) keeps the whole disposed page reachable, so the page is never garbage collected.

1. Create two routable pages. Page A has a TelerikGrid with Reorderable="true" and a TelerikTabStrip with a few tabs. Page B is empty.
2. Open Page A, then navigate to Page B with the in-app router (no full reload).
3. Run this in the browser console:

Object.entries(TelerikBlazor._instances)
     .filter(([k, i]) => i && i.element && !i.element.isConnected)
     .map(([k, i]) => k + ' / ' + i.constructor.name)

Sample project attached.

TelerikBlazorApp1.zip

Current behavior

(optional)
one "...-telerik-ColumnDraggable" entry per reorderable or groupable grid, all pointing at detached elements. Each pageA -> pageB round trip adds more, and the detached DOM is never released.

Expected/desired behavior

An empty array is returned. Page A's components were disposed, so their JS instances should have been destroyed.

Workaround

After each navigation, we destroy and remove any registered instance whose element is no longer in the page:

   const instances = window.TelerikBlazor && window.TelerikBlazor._instances;
   for (const key of Object.keys(instances || {})) {
       const i = instances[key];
       if (i && i.element && !i.element.isConnected) {
           try { i.destroy && i.destroy(); } catch (e) { }
           delete instances[key];
       }
   }

Suggested Fix

1. In TableHeaderRow.DestroyColumnDraggable(), use InvokeVoidAsync, as DestroyColumnReorderable() does. Or call the destroy methods before base.Dispose().

Environment

• Kendo/Telerik version:
• Browser: [Chrome XX, Firefox]

The ability to choose which options to appear in the ContextMenu.

=====

TELERIK EDIT: In the meantime, here is how to hide context menu items with CSS:

    /* Hide the Rename item in the FileManager context menu */
    .k-context-menu:has(.k-svg-i-download) .k-menu-item:nth-of-type(1) {
        display: none;
    }

    /* Hide the Delete item in the FileManager context menu */
    .k-context-menu:has(.k-svg-i-download) .k-menu-item:nth-of-type(3) {
        display: none;
    }

Here is a complete example: https://blazorrepl.telerik.com/cpPkuBEq408A36p010

Example:

<PageTitle>Home</PageTitle>

<div>
    <TelerikTextBox Width="20rem" Placeholder="Pallet" DebounceDelay="1000" @bind-Value="@_textInput" OnChange="@(async (input) => await OnInputChanged(input))" />
</div>
<p>@_textInput</p>


@code {
    private string? _textInput;

    private async Task OnInputChanged(object input)
    {
        Console.WriteLine($"Immediate: function parameter: {input}, bound variable: {_textInput}");
        await Task.Delay(1000);
        Console.WriteLine($"Delayed: function parameter: {input}, bound variable: {_textInput}");
        //Make the OnChange event receive the immediate value when the DebounceDelay is set
    }
}

The DebounceDelay is set to 1 second to highlight the behavior, although we have observed it with delays less than 100 milliseconds when the input is from a barcode scanner and the Enter is part of the scan. Start the sample, type "123" in the input, and hit enter within 1 second.

The output in the console is:
Immediate: function parameter: , bound variable:
Delayed: function parameter: , bound variable: 123

(Also applies to AutoComplete, DropDownList, MultiSelect, MultiColumnComboBox).

When using Height="auto" in the popup settings and filtering with a dropdown above the component, the dropdown detaches from the main component.

<ComboBoxPopupSettings Height="auto"></ComboBoxPopupSettings>

https://blazorrepl.telerik.com/cKkSQGFO50ovCpr829

A possible workaround is to use a MaxHeight that is less than half the browser viewport.

<ComboBoxPopupSettings Height="auto" MaxHeight="45vh"></ComboBoxPopupSettings>

Bug report

Reproduction of the problem

(bug report only)
The label of the filter menu icon displays: “column filter menu settings”. In version 12.0.0 it included the name of the column field.

1. Run this example: https://blazorrepl.telerik.com/cKFaOPvO56rcaHqx16
2. Hover a filter icon in the Grid’s header with the mouse cursor.

Current behavior

(optional)
The label “column filter menu settings” appears.

Expected/desired behavior

The label text includes the column name, e.g., “Price column filter menu settings”.

Workaround:

https://blazorrepl.telerik.com/cUPYaPlO55EJNiKJ24

Environment

• Kendo/Telerik version: 15.0.1
• Browser: [all]

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.

Hello,

Please consider a Grid feature that changes the component layout on mobile devices or narrow screens. The idea is to switch the column layout to a card layout or anything similar to this example: https://css-tricks.com/responsive-data-tables/

It is possible to implement a similar behavior with the Telerik Blazor Grid and MediaQuery components, but it requires reusing the column titles in the CSS code: https://blazorrepl.telerik.com/GnYPmHFR176Jg5Yg02

===

Telerik Blazor team: Everyone who is interested in this feature, please vote for it to help us prioritize. Also, share your opinion about which Grid features you strictly need in the "mobile" layout and which ones you are ready to sacrifice. Some features don't make sense in a card / listview layout anyway, but still, the mobile-friendly Grid may require completely different HTML markup and UX, so some features may need to be completely revamped.

Title: WCAG 1.3.1: Ensures elements with an ARIA role that require child roles contain them (#\39 374a450-079d-4586-b823-d6bc7723505f)
Tags: Accessibility, WCAG 1.3.1, aria-required-children

Issue: Ensures elements with an ARIA role that require child roles contain them (aria-required-children - https://accessibilityinsights.io/info-examples/web/aria-required-children)

Target application: Hermes Home - https://localhost/TrafficLoss

Element path: #\39 374a450-079d-4586-b823-d6bc7723505f

Snippet: <div class="k-grid-aria-root" id="9374a450-079d-4586-b823-d6bc7723505f" role="grid" aria-label="Data table">

How to fix: 
Fix any of the following:
  Element has children which are not allowed (see related nodes)
  Element has no aria-busy="true" attribute

Environment: Microsoft Edge version 111.0.1661.41

====

This accessibility issue was found using Accessibility Insights for Web 2.37.3 (axe-core 4.6.3), a tool that helps find and fix accessibility issues. Get more information & download this tool at http://aka.ms/AccessibilityInsights.

============================  code =============================

                           <TelerikGrid Data="@ViewModel.RDLInformation" TItem="TLSummary"
                                                        Pageable="true" 
                                                        Sortable="true" 
                                                        Groupable="false"
                                                        FilterMode="Telerik.Blazor.GridFilterMode.FilterRow"
                                                        Resizable="true" 
                                                        Reorderable="true"
                                                        Height = "100%">

....

                            </TelerikGrid>

The PDF Viewer may render parts of the contents as blank (empty space) and only form elements like checkboxes remain visible.

Test PDF file in ticket 1716925

My users use Tab to focus the masked textbox and when they start typing (its content was highlighted because of getting focus with Tab), that typing action does not put the range (caret) in the correct place - it remains at position 0 rather than going to position 1.

For example, in the below phone mask they type "9" and then "0" and I would expect to get "90" but I get "0".

---

ADMIN EDIT

A workaround is to collapse the range when the input gets focus:

@inject IJSRuntime JsInterop

<input />
<span @onfocusin="@CollapseInputSelection" @ref="@ParentElem">
    <TelerikMaskedTextBox Mask="+1 (000) 000-0000"
                          IncludeLiterals="true"
                          @bind-Value="@CellPhoneNumber"
                          Class="form-control" />
</span>

@* move this script to an actual script file instead of using this hack *@
<script suppress-error="BL9992">
    function collapseInputSelection(root) {
        setTimeout(function () {
            var input = root.querySelector("input");
            if (input) {
                input.setSelectionRange(0, 0);
            }
        }, 20);
    }
</script>

@code{
    string CellPhoneNumber { get; set; }

    ElementReference ParentElem { get; set; }
    async Task CollapseInputSelection()
    {
        await JsInterop.InvokeVoidAsync("collapseInputSelection", ParentElem);
    }
}

---

I want the user to only be able to select times between, for example, 11AM and 1PM. Setting Min and Max does not limit that, I can select any time: