Unplanned
Last Updated: 06 Oct 2026 11:38 by ADMIN
When a DropDownList uses virtual: true together with a grouped data source (group: { field: "..." }) and a fixedGroupTemplate, each rendered group <ul role="group"> gets an aria-labelledby pointing at its group header <li>, with an id like <optionId>-group-<index>-<groupValue>. The group currently under the sticky header (.k-list-group-sticky-header), usually group 0, has no inline header <li> because its name is shown in the sticky header. Its aria-labelledby is still set, though, so it points at an id that doesn't exist. Accessibility checkers such as WAVE report this as a "Broken ARIA reference". Looking at VirtualList._createGroupUl, aria-labelledby is always set from _generateGroupId(...), but the header <li> with that id is only created when hasHeader is true.

To reproduce (Kendo UI for jQuery 2026 Q2): create a DropDownList with virtual: { itemHeight: 26, valueMapper: ... }, groupTemplate and fixedGroupTemplate, and a data source grouped on a field with at least two groups. Open the popup and inspect the list. The second group's aria-labelledby resolves to its header <li>. The first group's aria-labelledby (for example ...-group-0-Client-Sets) matches no element in the DOM. Expected: every group's aria-labelledby points at an element that exists. For the headerless group that could be the sticky header, if it's given an id, or the attribute could be left off. As a workaround, we give the sticky header an id and use a MutationObserver to repoint any dangling aria-labelledby at it.
Declined
Last Updated: 06 Oct 2026 10:52 by ADMIN

When unformatted multi-line content is pasted in an existing paragraph inside the Kendo Editor, the paragraph is removed and the pasted content is inserted in the body of the Editor.

Steps to reproduce:

  • Open: https://dojo.telerik.com/osANirag/8
  • Type in the content editable: "text row 1", hit ENTER, type "text row 2"
  • Copy the content from the content editable.
  • Paste the content in the first paragraph in the Kendo Editor

Result:

The pasted content replases the paragraph.

Expected Result:

The pasted content should be inserted in the paragraph.

Declined
Last Updated: 06 Oct 2026 10:52 by ADMIN
Created by: Ari
Comments: 0
Category: Kendo UI for jQuery
Type: Bug Report
0

Bug report

The kendo.culture.nb-NO.min.js file contains some unwanted characters: "Â".

Reproduction of the problem

See Ticket ID: 1486493 for more details.

The unminified file looks correctly: https://github.com/telerik/kendo-ui-core/blob/master/src/cultures/kendo.culture.nb-NO.js

Current behavior

Expected/desired behavior

Environment

  • Kendo UI version: 2020.3.915
  • jQuery version: x.y
  • Browser: [all]
Declined
Last Updated: 06 Oct 2026 10:51 by ADMIN
Created by: Michael D
Comments: 0
Category: Kendo UI for jQuery
Type: Bug Report
0

Bug report

ContextMenu allows having focused and hovered items simultaneously.

Reproduction of the problem

1. Open the Dojo
2. Right-click to open the ContextMenu and hover over the first item.
3. Start navigating in the ContextMenu with the down arrow without moving the cursor

Current behavior

There is an item marked with 'k-hover' class and an item marked with 'k-focus' class.
image

Expected/desired behavior

It is supposed to have a single active item in the ContextMenu.

Environment

  • Kendo UI version: 2022.1.412
  • Browser: [all ]
Declined
Last Updated: 06 Oct 2026 10:50 by ADMIN
Created by: Paul
Comments: 1
Category: Kendo UI for jQuery
Type: Bug Report
0

 My recurrence rule is: FREQ=MONTHLY;COUNT=2;INTERVAL=1;BYSETPOS=2;BYDAY=WE;WKST=SU. This event falls on the second Wednesday of the month for two months in a row. When I edit the event, the wrong option is picked. Note in the screenshot attached we are on 11/09/2022 which is the second Wednesday. And the scheduler correctly shows this event. But the edit window sets the properties wrong. I am using a custom template for the edit window, however the recurrence editor portion is unmodified.

 I was able to fix this in the Kendo.all.js file directly. The highlighted lines below were added. When I publish this for customers I use the Kendo custom download tool to get a minified script of only what I need. I then need to carefully port this change using Notepad++. This makes it tough to update versions which is why I am a few versions back.

Declined
Last Updated: 01 Oct 2026 13:44 by ADMIN

There is an issue regarding text inputs in forms, when clicking the label (in a chrome emulator e.g. https://demos.telerik.com/kendo-ui/m/index#mobile-forms/index) or when clicking the form (on android).

 

The input and label move to the left edge.

In Development
Last Updated: 30 Sep 2026 13:06 by ADMIN
Created by: Anthony
Comments: 0
Category: Kendo UI for jQuery
Type: Bug Report
0

Bug report

Following the commands in the following article

https://www.telerik.com/kendo-jquery-ui/documentation/intro/installation/ecmascript

and the steps for version after February 2026 - https://www.telerik.com/kendo-jquery-ui/documentation/intro/installation/ecmascript

when running npm run scripts: custom command or npm run build: custom an error is thrown:

Error: spawn npx ENOENT

at ChildProcess._handle.onexit (node:internal/child_process:287:19)

at onErrorNT (node:internal/child_process:525:16)

at process.processTicksAndRejections (node:internal/process/task_queues:90:21)

Emitted 'error' event on ChildProcess instance at:

at ChildProcess._handle.onexit (node:internal/child_process:293:12)

at onErrorNT (node:internal/child_process:525:16)

at process.processTicksAndRejections (node:internal/process/task_queues:90:21) {

Expected/desired behavior

A custom folder containing a custom script wth only the needed components should be created.

Environment

  • Kendo/Telerik version: 2026.3.811
  • Browser: [all ]
Declined
Last Updated: 25 Sep 2026 08:21 by ADMIN

When a kendoContextMenu is applied to a combobox (html tag select) you are not able to show the select options by tapping it. The behaviour is on mobile browser only (tested iPad and Google Chrome developer tools with device toolbar enabled).

I reproduced the issue in telerik dojo, here is the code.

<!DOCTYPE html>
<html>
<head>
    <base href="https://demos.telerik.com/kendo-ui/menu/context-menu">
    <style>html { font-size: 14px; font-family: Arial, Helvetica, sans-serif; }</style>
    <title></title>
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2021.1.330/styles/kendo.common-bootstrap.min.css" />
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2021.1.330/styles/kendo.bootstrap.min.css" />
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2021.1.330/styles/kendo.bootstrap.mobile.min.css" />

    <script src="https://kendo.cdn.telerik.com/2021.1.330/js/jquery.min.js"></script>
    
    
    <script src="https://kendo.cdn.telerik.com/2021.1.330/js/kendo.all.min.js"></script>
    
    

</head>
<body>
    <div id="example">
      <select>
        <option>Opzione 1</option>
        <option>Opzione 2</option>
        <option>Opzione 3</option>
      </select>
      
    <ul id="menu">
        <li>
            <img src="../content/web/toolbar/reply.png" /> Reply
        </li>
    </ul>
      
</div>
<script>
    $(document).ready(function() {
        setTimeout(function () {
            var initMenu = function () {
                menu = $("#menu").kendoContextMenu({
                    target: "select",
                    select: function(e) {
                        // Do something on select
                    }
                });
            };

            initMenu();
        }, 0);
    });
</script>

</body>
</html>
Duplicated
Last Updated: 25 Sep 2026 08:21 by ADMIN

Hi,

I've notice an issue with Scheduler: the height for group slot is not correct calculated and items goes down to the next group slot.

Scheduler :

   - group vertical after a field

   - type of scheduler: "timelineWeek" or "timelineMonth"

   - items of the group have same start date and their number are bigger then 20.  

kendo ui version: 2020.1.219. Same issue with 2021.1.119

----------------------------------------------------------------------------------------------------------------------

I've created a dojo as example:  https://dojo.telerik.com/EHeNigIQ  .   Also, you can see the issue into the picture bellow.

You can modify the variable  "rows = 30;"  and you will see more items that goes wrong into the other group slot.

 

Completed
Last Updated: 25 Sep 2026 07:32 by ADMIN

On https://demos.telerik.com/kendo-ui?_ga=2.149841974.1082962146.1579102350-1080570292.1579102350 , all links in the "Sample Applications" section return 404 (for example https://demos.telerik.com/bootstrap/ )

Removing all URL params helps.

Any URL param ( https://demos.telerik.com/kendo-ui?x=1 ) reproduces the issue.

Completed
Last Updated: 25 Sep 2026 07:27 by ADMIN
Created by: Anna
Comments: 0
Category: Kendo UI for jQuery
Type: Bug Report
0

The following typings are missing in @types/kendo-ui version 2019.3.0

  1. kendo.data.TreeListModel has no parentIdField
  2. kendo.ooxml.WorkbookSheetRow has no property "type"
  3. kendo.ui.PanelBar has no dataSource
  4. kendo.ui.DatePicker has no dateView (it's used in https://docs.telerik.com/kendo-ui/knowledge-base/datepicker-show-quarterly-frequency  )
  5. kendo.ui.EditorEvent has no keyCode
  6. kendo doesn't expose kendo.wheelDeltaY()
  7. kendo.data doesn't expose "binders" (filed at https://github.com/telerik/kendo-ui-core/issues/4049 )
 
Declined
Last Updated: 25 Sep 2026 06:57 by ADMIN

In a grid with virtualization, when just normally scrolling down requests for the exact same data are often sent multiple times after each other. The reason for this is probably that the grid sends an asynchronous request for example Top 100, Skip 200 and then does not keep track of that it is still waiting for a reply for this request, before asking for the same data a short period later. 

Commonly requests for the same data is made 2 or 3 or more times after each other, causing performance problem at the server side and in many cases unnecessary calls to the database. Fixing this should lower the number of requests for data to the server considerably, maybe with a factor two or more with just normal grid operation when the user is just scrolling down to view more data in the grid.  

To demonstrate the problem, open a copy of the virtualization grid demo, for example here:

https://dojo.telerik.com/iXijoyaY

Open the Developer Tools and just observe which network requests are sent to the server. Just scroll down in any way and observe that very often the exact same request is made. A request for the same data has the same Top and Skip values in the parameters sent the server. You can see the servers reply is exactly the same JSON data multiple times after each other.

Solving this performance problem almost completely would seemingly be to in a variable just keep track of the "Latest request" sent, since the problem happens mostly just with normal scrolling in one direction with request sent after each other. So one would need to keep track of that a call for Top 100, Skip 200 has been made, and if the program wants to request the exact same data again, just wait for a reply for the first request, instead of sending a new one. (If needed, send a new request only after a specific timeout for a reply for the first one).

A more thorough solution would be to have a data structure to keep track of the Top and Skip tuples for all the calls to the server that has not yet have had a reply from the server, and not repeat those exact same calls again if still waiting for a reply for the first request.

Declined
Last Updated: 25 Sep 2026 06:45 by ADMIN
Created by: Igor Mendizabal
Comments: 0
Category: Kendo UI for jQuery
Type: Bug Report
0

Bug report

When a decimal number has 8 digits after the decimal separator and '#' is used for formatting the precision is lost and the number is rounded.

Reproduction of the problem

  1. Open the Dojo example and check the result in the console

Current behavior

kendo.toString(0.00000015,"###.########" returns 0.0000002

Expected/desired behavior

The number should not be rounded and the precision should not be lost. The results should be the same with kendo.toString(0.00000015,"n8") and kendo.toString(0.00000015,"0.00000000")

Environment

  • Kendo UI version: 2022.3.1109
  • Browser: [all ]
Completed
Last Updated: 25 Sep 2026 06:41 by ADMIN

Dojo example.

1. Resize the browser window so that its height is smaller than the DropDownTree's popup height.
2. Click the DropDownTree to open its popup.
3. The popup opens and then auto-closes

Declined
Last Updated: 25 Sep 2026 06:29 by ADMIN

This is an error that took us an hour to figure out.

We are using the right-arrow icon as part of the content within a collapsible header to represent a state transition. (See image)

We found that the expand/collapse icon did not appear.

 

Further investigation reveals that if the header content contains a span with a class matching the regular expression k-i-arrow.* then the expand/collapse icon doesn't work. It could contain anything else, it was just that one class pattern that threw it.

See this example. https://dojo.telerik.com/EwAsaKAf/3

I also posted a forum message here: https://www.telerik.com/forums/expand-collapse-arrow-fails-to-appear-if-a-class-matching-a-certain-pattern-appears-anywhere-in-the-header   

This is clearly a bug, and one that I suspect can be fixed easily.

Declined
Last Updated: 25 Sep 2026 06:22 by ADMIN

Hello!

Prior to 2024.2.514 (2024 Q2), the DateRangePicker would "force users first to select start and then end range regardless of the date input selected" [1,2]. However, with the latest 2024 Q2 release, clicking the End input on the DateRangePicker selects the range end.

I did not see this specifically mentioned in the release notes, https://www.telerik.com/support/whats-new/kendo-ui/release-history/kendo-ui-for-jquery-2024-2-514-(2024-q2), so I am reporting this as a bug.

Here is a basic Dojo to demonstrate: https://dojo.telerik.com/IWAbUpuV. You can see the previous behavior by changing the library to the previous version (2024.1.319).

References

  1. https://feedback.telerik.com/kendo-jquery-ui/1449956-modifying-date-range-begin-end-values-exclusively-using-begin-end-inputs
  2. https://feedback.telerik.com/kendo-jquery-ui/1582861-daterangepicker-selection-process-confuses-users-should-be-able-to-select-dates-independantly-for-from-and-to-range
Declined
Last Updated: 25 Sep 2026 06:22 by ADMIN
After updating drawing a standard area chart with 10 data points takes 10-20x the amount of time, and renders the browser frozen for long periods.
Declined
Last Updated: 25 Sep 2026 06:21 by ADMIN
Created by: Bradley
Comments: 1
Category: Kendo UI for jQuery
Type: Bug Report
0
Hey all,

grid.exportSelectedToExcel(true) is working for continuous selection ranges, displaying the header column and then the selected entries in the excel file.

However, when the selection is not continuous (for example, maybe I have the first row selected and the third row selected, but not the second), for every row that is selected it adds a new column header row.

I've included some screenshots as an example:

SELECTED ROWS IN GRID:



EXPORTED USING grid.exportSelectedToExcel(true):



I have testesd this on multiple versions, including 2023.1.314 and 2022.2.621

I would appreciate any assistance with this.

Thanks
Declined
Last Updated: 25 Sep 2026 06:20 by ADMIN
One of my schedulers has an optional title field. The title is computed in these cases based on other properties on the event. An example could be an event that contains a “category” of “Break” and an employee of “Bob”. The title if empty might return “Break for Bob”. When we edit this event and choose a new category, the save works, and the new event coming in with the SignalR update contains the new “title” property as needed. But the event does not update in the DOM. It looks to be skipped somehow. This required a bunch of JavaScript to fix. Need to enumerate all events coming in the SignalR post, then enumerate all DOM elements for events in that scheduler, and manually update the DOM text for the event
Completed
Last Updated: 25 Sep 2026 06:11 by ADMIN
Created by: Michael D
Comments: 1
Category: Kendo UI for jQuery
Type: Bug Report
0

The Kendo UI ListView widget supports setting the selected items via the select method. Up to version 2022.2.802, calling select() triggered a change event. This is no longer the case.

You can see the different behaviors in these two DOJOS: 2022.2.802 vs 2023.1.117 (the item gets selected after a second to make sure the dataSource has finished loading).

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