Last Updated: 14 Apr 2021 10:01 by ADMIN

Step by step instructions on how to reproduce the problem

Try entering a negative value in the filter column using the StackBlitz example here https://stackblitz.com/edit/react-dx7cna?file=app/main.jsx


This works using "ES" as locale (your example) https://stackblitz.com/run/?file=app/main.jsx


Github issue here https://github.com/telerik/kendo-react/issues/897


Last Updated: 12 Apr 2021 14:22 by ADMIN


When the NumericTextBox is set to "c0" format and has a value of 0 ($0), it doesn't capture the first digit entered.


Reproduction Steps:

  1. Set the field value to 0 ($0)
  2. Hit "Tab" to blur the field
  3. Hit "Shift-Tab" to focus the field (field contents will be highlighted)
  4. Enter "123"
  5. Repeat steps 2 through 4



Chrome -- Version 89.0.4389.114 (Official Build) (64-bit)


Expected Behavior:

  • After step 4, field shows "$123"
  • After step 5, field shows "$123"


Observed Behavior:

  • After step 4, the field shows "$230"
  • After step 5, the field (correctly) shows "$123"



  • This bug seems to occur when the field has a value of 0 ($0) before gaining focus
  • This doesn't occur when the specified format is "c2" or "n0"


Code Snippet:

<NumericTextBox format="c0" />

Last Updated: 08 Apr 2021 05:00 by ADMIN


When typing into a React autocomplete with the "suggest" prop, the component does not always display the suggestion in the dropdown. It appears that in Chrome, only the very top of the suggestion is visible in the dropdown, while in Edge, it isn't at all.


Reproduction Steps:

  1. Navigate to https://www.telerik.com/kendo-react-ui/components/dropdowns/autocomplete/suggestions/
  2. Type "d" into the AutoComplete in Uncontrolled Mode example



  • Chrome -- Version 89.0.4389.114 (Official Build) (64-bit)
  • Edge -- Version 89.0.774.68 (Official build) (64-bit)


Expected Behavior:

  • The suggestion is fully visible in the dropdown


Observed Behavior:

  • The suggestion is either not visible, or only partially visible





Last Updated: 30 Mar 2021 11:33 by ADMIN
Scheduled for 4.6.0
AutoComplete focused item is not set correctly if the items are with different height.

Currently, it is required to have the same height for the items, but this can be very hard in cases when the items are dynamic with various height.
Under Review
Last Updated: 22 Mar 2021 15:07 by ADMIN

I noticed that the value prop of the TextAreaChangeEvent is defined as string | number | string[].

When will this value be number or string[]?

Won't it always be string due to the fact that it's a text area input?

In Development
Last Updated: 22 Mar 2021 06:47 by ADMIN
Created by: Ryan
Comments: 1
Type: Bug Report
The ListView component has a prop called item that allows you to pass in a custom component for rendering. The type definition for that prop is a component with a props type of "any". The any prop type isn't good here because it's clear there's a structure to these props. Can you please modify this to add a type definition? Thanks.
Last Updated: 05 Mar 2021 05:34 by ADMIN
Created by: Michel
Comments: 2
Type: Bug Report


I'm using the NumericTextBox to receive a value stored in a state, it has a percent "p3" format so it display numbers like this "0,000 %". When the state change, the value displayed in the NumericTextBox loses its format. If I click in the field and press space or any other key, the format comes back. The expected result was the NumericTextBox always keeping the format, what can be done in this situation?

NumericTextBox code

This is the textbox when I change the value direct in the field, it works fine

The state is shared between 2 NumericTextBox. if I change the value in the other textbox, it loses the format in this textbox

If I go in this textbox and just hit space, the format comes back

What can be done to keep the textbox format?


Thank you

Last Updated: 02 Mar 2021 09:40 by ADMIN
Created by: James
Comments: 1
Type: Bug Report

The className prop on the ChipList component is ignored in version 3.18.0. A simple addition of class strings does not appear in the compiled product, e.g.

  return (
      className='flex-layout --wrap --end'
      chip={props => (
        <Chip removable removeIcon='k-i-close' {...props} />


I've looked through the transpiled source in node_modules, and it seems the className property passed to the React.createElement() function totally ignores the prop class names.

Last Updated: 24 Feb 2021 12:13 by ADMIN

Defined a date rang. But it allows to enter a date larger than a max date of the range. Both via calendar and manually.

const minDate = new Date(1, 1, 1);
const maxDate = new Date(9999, 12, 31);

          return (
              <DatePicker value = {this.state.value}

Under Review
Last Updated: 19 Feb 2021 13:48 by ADMIN

The width of the Kendo React DatePicker can become small due to the container width.

In such case, consider the following use case

Users select the date part (year) and start incrementing it by the "up" key. The year date part is selected, but is partially visible,

and the users do not see the date part that they are currently modifying, while they can fully see the other date parts that are not currently in focus.


The DateInput needs a horizontal scrolling to ensure that a focused date part is fully visible to the users in case if the width of the component is narrow.


Please check the case here


Last Updated: 16 Feb 2021 11:29 by ADMIN

The SCSS files from the kendo-theme-material contain !important rule, that makes it difficult to override the styles in the consuming application.

We have a requirement to customize the DatePicker Kendo React component so that it has a border around all 4 sizes, as by default the theme has the border only on the bottom.

We have applied a new custom style to k-picker-wrap  and added the 
border-top-color$datetime-border !important;


.k-picker-wrap-sphera {
        border-top-color$datetime-border !important;


But due to the !import rule in the file 

@progress\kendo-theme-material\scss\datetime\_layout.scss, line 15

the custom style that we applied in the consuming application does not get applied.


Please find screenshots with the details of the problem.

The screenshots indicate that the custom style for the border-top-color did not get overriden, and the box is missing the top border.

Kindly advise approach that we can use to customize the CSS styles that has !important CSS rule, so that we can override the styles defined in the material theme.

Under Review
Last Updated: 05 Feb 2021 13:53 by ADMIN

if (_this.element && document.activeElement === _this.element) {
                _this.element.setSelectionRange(selection.start, selection.end);

@progress/kendo-react-dateinputs": "^4.3.0"

DatePicker and DateInput React components malfunction when rendered inside iFrame.


For example, key navigation between date parts is not working for the DateInput/DatePicker rendered inside iFrame.

When user clicks on the month part of the date, the month part does not get selected.

Same for day or year part.


The reason is a code similar to this in DateInput.js:


if (_this.element && document.activeElement === _this.element) {
                _this.element.setSelectionRange(selection.start, selection.end);

if (document.activeElement !== _this.element) 

This code references the top level "document".

If the React component is rendered inside iFrame, we need to use the contentDocument of the iFrame to have this code working as expected.


Could replace "document" with "_this.element.ownerDocument" to make it work inside iFrame as well as in the top level window.


Now "document.activeElement" always returns the reference to the iFrame element rather than the expected date input element inside iFrame.




Under Review
Last Updated: 04 Jan 2021 08:26 by ADMIN

When changing the popup setting "appendTo" to a different element that has a wider width then the input of the dropdown multiselect is not working properly.
The dropdown is attached to that element but the styling is not changing to that parent and is just taking the width of it initial parent.

Example can be found here:



When using the standalone popup control this is working as it should and adjusting it's width based on the parent it's appended to.

Under Review
Last Updated: 24 Dec 2020 11:49 by ADMIN
Created by: Aske Hippe
Comments: 1
Type: Bug Report

Hi there!

I've written this component for a custom message input box for the Chat in Conversational UI for React:

import { ChatMessageBoxProps } from '@progress/kendo-react-conversational-ui'
import { FC } from 'react'

const CustomChatMessageBox: FC<ChatMessageBoxProps> = (props) => {
  return (
				className="h-full w-full text-base md:text-sm focus:outline-none"

export default CustomChatMessageBox

I'm supplying this component to the `messageBox` prop of the Chat component. However, sending the message doesn't work; neither by pressing enter or pressing the send button. If I replace the input with props.messageInput, it works.

Any help in fixing this will be greatly appreciated!

Thank in advance :-)

Under Review
Last Updated: 18 Dec 2020 14:40 by ADMIN
Created by: Aske Hippe
Comments: 1
Type: Bug Report

The navigation sidebar smooth scroll animation doesn't work for the Calendar component.

Here is a codesandbox that showcases the issue: https://codesandbox.io/s/hopeful-river-sk4oc?fontsize=14&hidenavigation=1&theme=dark

Thanks in advance for fixing this :-)


Last Updated: 23 Oct 2020 09:37 by ADMIN
  1. Configure a Kendo React Grid with paging on a react-bootstrap tab that is hidden on initial load
  2. Navigate to the tab - the Grid is rendered with truncated paging controls and no item count
  3. Resize the screen in any way - the full paging controls and item count are restored

Is there a workaround for this issue?

Last Updated: 20 Oct 2020 10:40 by ADMIN
The scheduler component does not work in Internet Explorer. We need to support IE 11 for our costumers. On the Kendo React example page I get an error that the  'object does not support property or method 'entries'.  In the code we're developing the error is similar, but refers to 'forEach' instead of entries. 
Last Updated: 20 Oct 2020 10:35 by ADMIN
Created by: Michael
Comments: 1
Type: Bug Report

On your Grid Demos:   When ever you try to edit a text cell the cursor always goes to the end of the text box


For example, go to your demo:




- Edit the first row.  Try to type something before "Chai" - the cursor will jump to the end of the textbox

Last Updated: 20 Oct 2020 10:32 by ADMIN
Created by: Adam
Comments: 1
Type: Bug Report

Hello Kendo React Team,


Here are a few bugs to address on the Kendo React Scheduler (3.6.0)...


Issue 1: November 3, 2019 Repeated on Week/Month Views

Visit https://www.telerik.com/kendo-react-ui/components/scheduler/views/month/ or https://www.telerik.com/kendo-react-ui/components/scheduler/views/week/, navigate to the first full week in November 2019. You will notice that 11/3 is repeated for Sunday/Monday. I'm wondering if this issue is related to daylight savings time. The calendar does not have a timezone configured (just uses the default UTC and my local timezone is PST).


Issue 2: Clicking an empty all day slot does nothing.

The onSlotClick callback should be fired when clicking on an all day event. I currently have to add an event listener using document.querySelectorAll("[data-slot-allday='true']"); to get the right behavior (definitely not ideal).


Issue 3: onItemDoubleClick and onSlotDoubleClick do not work on mobile devices.

My current solution to get everything to work on desktop and mobile is to use the onItemClick and onSlotClick and to not integrate useCallback with double clicking.


Suggested Improvements:

  • The documentation is silent about onItemClick, onSlotClick, onItemDrop, etc. These are essential to extend the behavior of the scheduler. I had to dig through the node modules directory and look through the .ts files to figure out how to use these work.
  • The mobile experience is awful. I miss the isMobile prop on the kendo-scheduler-react-wrapper. Whether you reintroduce that prop or add better css for smaller viewports, it would be greatly appreciated.



Under Review
Last Updated: 20 Oct 2020 10:30 by ADMIN


The DateTimePicker does not work in IE11 due to it's failure to fully support the shorthand syntax for flex (https://github.com/philipwalton/flexbugs#flexbug-4). In order for it to work in IE11 flex-basis needs a unit defined and therefore does not support calc() in this scenario.

Potential Fix:

If you break out flex-grow, flex-shrink and flex-basis then calc() can be used for flex-basis.

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