Signal Forms are now stable with Angular@22.

It would be nice to have an ability to use all kendo widgets with new form API.

For the Kendo DatePicker, if you try to set the size on a kendo-datepicker with plain text, it will not render and give a console error of "ERROR TypeError: Cannot read properties of undefined (reading 'nativeElement')".

Errors:

// HTML
<kendo-datepicker size="small" ... />

---

But on the other hand, it does work if you create a field of type "DateInputSize" and pass that variable to the size.

// TS
protected size: DateInputSize = 'small';
 

// HTML
<kendo-datepicker [size]="size" ... />

It would be great if you would allow loading single sheets instead of all the sheets every time. I receive data per sheet from my server.

Also the Spreadsheet fails to trigger events for:

• row added
• row deleted
• column width changed
• row height changed
• cell style changed
• format changed 
• cells merged

Provide a built-in option to paste Excel data inside the Editor formatted as a table (like the KendoReact Editor):

Please repeat the following steps to reproduce this critical accessibility issue:

it seems like for defining a custom color palette it's currently not possible to use css variables. When doing something like this:

I get a "Cannot parse color: var(--my-color)". 
Am I missing something?

If not, is this feature planned to be implemented sometime soon?

For me, I absolutely need this feature since I want to maintain the link between colors used within the application. We have custom colors defined as css variables. I want those colors to appear inside the kendo colorpicker palette and when selecting one I want this css variable to be used, let's say as a colored line in a graph component. when later changing the value of the css variable the color within the graph should update. that's why converting my css variables into hex values does not work for me, since it's breaking the link. 

On a sidenote - is it possibel to define a custom palette preset, like the ones available: 

  public palettes: string[] = [
    "office",
    "clarity",
    "slipstream",
    "basic",
    "monochrome",
  ];

Thanks for your help.
Thomas

Hi,

We're heavily using the Scheduler component, but we've hit a problem with `slotClick` in scenarios involving multiple scheduler instances on the same page.

With two schedulers on one page, slot detection for the second scheduler (used in context-menu flows via slotByPosition) can be wrong.

Detaild repro: Stackblitz

Hi Telerik Support Team,

I would like to request a feature enhancement for the Kendo UI for Angular TreeList component, specifically regarding the selection mechanisms.

Feature Request:

Please consider adding a (selectAllChange) event emitter to the <kendo-treelist-checkbox-column> component, similar to how selection events are handled or how other advanced components expose header checkbox interactions.

Use Case / Motivation:

Currently, when a user clicks the "Select-All" checkbox in the header, it is difficult to intercept this specific action efficiently to run custom business logic, perform secondary async operations, or manually update external states that depend strictly on the "all selected/unselected" toggle.

While we can listen to general selection changes on the TreeList, having a dedicated (selectAllChange) event that emits the current state (e.g., true, false, or even a custom event object) would provide much cleaner control over the application state, especially in complex data-binding scenarios.

Proposed Syntax:

<kendo-treelist-checkbox-column 
    [showSelectAll]="true" 
    (selectAllChange)="onSelectAllChange($event)">
</kendo-treelist-checkbox-column>

This event would be useful to focus the editor on some specific scenarios like in the Dialog:

https://www.telerik.com/kendo-angular-ui/components/knowledge-base/focusing-editor-inside-dialog

It currently relies on a short delay, which might differ depending on the machine.

Hi,

in a Treeview bound to flat data (probably does not matter), if I have 3 items, and I drop the first 2 in the last, the loading indicator is stuck.

Stackblitz repro: https://stackblitz.com/edit/angular-xiwrcwsx?file=src%2Fapp%2Fapp.component.ts

Can you please take a look at it?

Best regards,
Michael

When enabling the showSelectAll option in a checkbox column on the TreeList component, a checkbox is rendered with the TreeListSelectAllCheckboxDirective. In its constructor, this directive includes some logic that causes the TreeList to instantiate a new ViewCollection every time a selection change occurs. However, the call to ViewCollection.loadView() does not pass the service responsible for determining expanded nodes, so the default fallback (which returns true for all nodes) is used.

Problem

• Unnecessary and potentially expensive backend calls

• Performance degradation, especially with large datasets

• Inefficient "select all" logic that does not respect the current loaded/visible state

This behavior appears to ignore the fact that TreeList is configured for remote data binding with lazy-loaded children.

Expected Behavior

• showSelectAll should only evaluate the currently loaded and visible items

• fetchChildren() should not be called for every node

• Integration with remote/lazy-loaded data should be respected

Suggested Solutions

1. Update TreeListSelectAllCheckboxDirective to properly integrate with the expanded node detection logic or allow injection of a custom service.

2. Provide an override or callback to control the behavior of the "select all" checkbox manually in remote scenarios.

Steps to Reproduce

1. Configure a TreeList with hasChildren and children to fetch child nodes lazily.

2. Enable selection with checkbox column and showSelectAll: true.

3. Click any checkbox inside the TreeList.

4. Observe that fetchChildren() is triggered for all nodes, not just expanded ones.

StackBlitz repro:

Open console and click on the first cell. 

https://stackblitz.com/edit/angular-e2ai4pjx?file=src%2Fapp%2Fapp.component.ts,angular.json

Description

When you move the cursor to a new series item, the tooltip position does not move until you leave the chart area and re-enter. It changes the content based on where the cursor is pointing, but does not change the position.

Steps To Reproduce

1. Create a new Angular application
2. Add the Kendo UI Chart and paste the following code in the app.component.ts file:

import { Component } from '@angular/core';
import {KENDO_CHARTS} from "@progress/kendo-angular-charts";

@Component({
  selector: 'app-root',
  imports: [KENDO_CHARTS],
  template: `
    <kendo-chart>
      <kendo-chart-legend position="bottom"></kendo-chart-legend>
      <kendo-chart-series>
        <kendo-chart-series-item
          type="donut"
          [data]="data"
          field="value"
          categoryField="category"
          colorField="color"
          [holeSize]="60"
          [tooltip]="{
            visible: true,
            format: '{0:C0}'
          }"
          [highlight]="{ visible: true }"
        >
        </kendo-chart-series-item>
      </kendo-chart-series>
    </kendo-chart>
`,
})
export class App {
  public data = [
    { category: "Electronics", value: 245000, color: "#0058e9" },
    { category: "Clothing", value: 189000, color: "#37b400" },
    { category: "Home & Garden", value: 156000, color: "#f59c1a" },
    { category: "Sports", value: 134000, color: "#ff6358" },
    { category: "Books", value: 98000, color: "#8c43ff" },
    { category: "Toys", value: 78000, color: "#00acc1" },
  ];
}

3. Run the application

Screenshots or video

Actual Behavior

The Tooltip position only changes when you leave and reenter the Chart area. It does not change when you move the cursor from one series item to other, it updates the content displayed in the Tooltip though.

Expected Behavior

The Tooltip position should move with the cursor as seen in the screen recording below:

Because of the CSS, if a parent element has used translate (transform: translateX(0px); ) every child element  under it is no longer fixed.

This causes components like kendo-dialog to be relatively positioned inside the drawer - usually cut off.

Even turning off animation still leaves the style rule.

• Disabling animation should also ensure no related CSS is applied (like using transform: none at least)
• Provide a keyframe based animation instead of translateX (example http://jsfiddle.net/whnuLf6v/50/)

For Angular Kendo Scheduler, if the Work week view is selected (default Mon-Fri), and Sunday is selected on the mini calendar to select the date to display - the previous week will be displayed. This is confusing, as simply toggling to Week view will then display the different, current week.

https://www.telerik.com/kendo-angular-ui/components/scheduler/views/day-week/

Expected behaviour: current week on mini calendar corresponds to the current week displayed regardless of whether full week or work week view is selected

Actual behaviour: selecting any day up until the desired "work week's start" (even if it's customized to start on e.g. Tuesday - and selecting Monday) will show previous week; switching then to full week view switches the week displayed to the one selected on mini calendar

------

Curiously, this does not happen for Kendo scheduler for JQuery (https://demos.telerik.com/kendo-ui/scheduler/index):

Ability to customize the fields control of the FilterExressions:

The multiCheckbox filter popup in the Grid sorts its distinct-value list using JavaScript's native string comparison, which orders characters by Unicode code point. This produces correct results for ASCII-only data but breaks for any locale whose alphabet includes characters outside the ASCII range (Turkish İ/Ğ/Ş/Ö/Ü/Ç, German ä/ö/ü, Czech/Polish diacritics, etc.).

The request is to sort the filter item list using locale-aware comparison (`String.prototype.localeCompare`) so that values appear in the correct alphabetical order for the active language, or provide a custom way to order the filter options.

Hi,

in the ListBoxComponent, there is the concept of custom messages, by which a "noData" message can be set:

https://www.telerik.com/kendo-angular-ui/components/listbox/api/custommessagescomponent#nodatatext

A similar concept would be beneficial for the ListView (https://www.telerik.com/kendo-angular-ui/components/listview), so that we can show a message in here as well in case no data is available.

Thanks,

Felix