Under Review
Last Updated: 23 Mar 2020 13:53 by ADMIN
I have incorporated the Kendo UI Treeview in my application by following closely the demo code, but Treeview does not work. The tree is shown on the web page, but the branches do not open and close when clicked on. Also, instead of the folder icon shown in the example, I just get the normal bullet points you would expect from a "<ul>" structure.
Last Updated: 06 Feb 2020 09:53 by ADMIN
Release 2020.R1.SP.next
Created by: Michal
Comments: 7
Category: TreeView
Type: Bug Report



There is an accessibility issue regarding MAS 4.2.1 - Object Information.

Using keyboard navigation and screen reader (Windows Narrator),

While the focus is on expanded tree item (with inner children), screen reader should not read all the children information in one go, it should read one by one.

See the attached video.

Can you help please?




Last Updated: 18 Mar 2020 09:39 by ADMIN
Release 2020.R2

Bug report

The expandTo and expandPath methods of the TreeView do not change the data-expanded and aria-expanded attributes to "true".

Reproduction of the problem

  1. Open this Dojo, which demonstrates two different TreeViews using the two methods.
  2. Inspect the expanded items.

Current behavior

After the items are expanded, their data-expanded and the aria-expanded attributes are false.

Expected/desired behavior

After the items are expanded, their data-expanded and the aria-expanded attributes should be set to true.


  • Kendo UI version: 2019.3.1023
  • Browser: [all]
Last Updated: 16 Sep 2019 14:18 by ADMIN
Release 2019.R3

Bug report


Reproduction of the problem

  1. Run the attached page in the browser.
  2. Take a 20 sec long heap snapshot. During these 20 sec click the "change" button to make changes to a specific node's data in the observable.

Current behavior

There are multiple detached span elements: screenshot
Memory consumption increases with every change: screenshot

Expected/desired behavior


  • Kendo UI version: 2019.2.619
  • jQuery version: x.y
  • Browser: [all ]
Last Updated: 11 Jun 2019 06:34 by ADMIN
Release 2019.R2.SP.Next
Created by: Brian
Comments: 1
Category: TreeView
Type: Bug Report

Hi there,

We noticed an issue with our Numeric TextBox after a recent upgrade on Chrome.  We're currently on Version 73.0.3683.86 (Official Build) (64-bit), the latest version at the time of writing.  Our setup has a grid using a TreeView as an editor template.  The TreeView, in turn, uses a NumericTextBox inside its item template.  I've prepared a working demo that illustrates the issue.  If you click on the last column of the grid, expand the TreeView and click on one of the NumericTextboxes, you will see that it loses the focus as soon as you click on it.  As a result, it's impossible to input anything into those fields.  Any other browsers don't have this issue.


We had a lot of issue reports from our clients this week so we're pretty sure it's a recent update from Chrome.  Please let me know if you need further clarification.  This is a fairly serious issue for us as it's affecting one of the main functionalities of our web application.  If you can provide a temporary workaround before the proper fix comes out, that'd be great.



Brian Roth

Last Updated: 12 Feb 2019 15:38 by ADMIN

The expand Icon of the treeview node is being reset, if another node is dropped above/below it.

To reproduce this behavior you can take the Drag and Drop demo of the treeview. In the initial state the "Furniture" node is expanded. If you take the "Decor" node and drop it above the furniture node, the "Furniture" node stays expanded but the icon changes to collapsed.

ADMIN EDIT: workaround: https://dojo.telerik.com/@bratanov/aLigiWaz

The issue does not manifest with R3 2019 SP1.

You can also monitor it in the following GitHub issue: https://github.com/telerik/kendo-ui-core/issues/4820