Last Updated: 16 Oct 2020 09:54 by Ilia

Bug report

When making a selection, navigating to another page, and going back to the initial page, which is restored from the Back-Forward Cache in Firefox, the selection of the ComboBox is not displayed.

Reproduction of the problem

  1. Go to the ComboBox demo
  2. Make a selection in the ComboBoxes
  3. Click on any other demo link in the navigation pane to the left (e.g. “Server Filtering”)
  4. Press the "Back" browser button

Current behavior

The selections made are not displayed when the page is restored from the Back-Forward Cache

Expected/desired behavior

The selections made should be displayed when the page is restored from the Back-Forward Cache


  • Kendo UI version: 2020.3.915
  • Browser: [Firefox 81.0.2]
Last Updated: 09 Oct 2020 13:00 by ADMIN

If you bind a ComboBox widget to a datasource containing arbitrary objects that contain a "data" field, the dropdown items will be "undefined" instead of the value of the dataTextField. I'm guessing the data field is messing up the template variable.

var formData = [
      key: '1',
      description: 'CT Safety',
      formTypeCd: 'S',
      data: {foo: '', bar: ''}
      key: '2',
      description: 'MR Safety',
      formTypeCd: 'S',
      data: {foo: '', bar: ''}
      key: '3',
      description: 'Medicare > 60 Billing',
      formTypeCd: 'I',
      data: {}

   dataTextField: "description",
   dataValueField: "key",
   dataSource: formData

Last Updated: 28 Aug 2020 11:31 by Ilia

Bug report

When using jQuery v3.5.1 and using the arrows to navigate through items in virtualized ComboBox a previous item is selected when valueMapper function is called. The behavior is not observed when using jQuery v1.12.3

Reproduction of the problem

  1. Run this dojo
  2. Click on the arrow to open the list of items
  3. Navigate through the items using the down arrow key

Current behavior

When the valueMapper function is called the selection moves to the previous item in the list

Expected/desired behavior

Selection should not change when the valueMapper function is called.
Working example with jQuery v1.12.3


  • Kendo UI version: 2020.2.617
  • jQuery version: 3.5.1
  • Browser: [all]
Last Updated: 02 Dec 2019 08:14 by ADMIN

As per https://docs.telerik.com/kendo-ui/api/javascript/ui/combobox/events/select I am expecting that select does not fire when the user enters text but does not select an item from the list. This is consistent with your other widgets like AutoComplete.


However as seen in this dojo https://dojo.telerik.com/ESOJibEB select triggers whenever I enter text and click off the box instead of only when I click an item in the combobox.


How to reproduce:

  • Open above Dojo
  • Click in the combobox and type some text.
  • Do not click on an item in the list and instead just click anywhere else on the page.
  • Check console and you will see select has been printed.


If you need any other help, let me know.


Kind Regards,



PS Im forced to select a browser but this is the same across both chrome and firefox.

Last Updated: 27 Nov 2019 09:56 by ADMIN
Created by: Anders Mad.
Comments: 1
Category: ComboBox
Type: Bug Report


You prob. already know this, but in Chrome attribute autocomplete should be "disabled" instead of "off" for e.g. combobox - then we don't get the auto fill.

Even thought it has no id nor name - I think it looks at the lavbel - in my case its "Name" and the combobox get a big Chrome auto fill from the address book. Setting it from "off" to "disabled" will disable both auto complete AND auto fill.

The same goes for the AJAX Combobox - will you notify that team too? Current hotfix for that is `$(".rcbInput").attr("autocomplete", "disabled");`



Last Updated: 11 Nov 2019 12:00 by Brent
Bug report
When submitting a selection in the ComboBox via Enter keypress an incorrect item is selected.

Reproduction of the problem
Run this dojo
Enter 199 in the input field and:
Click outside of the input field - text() returns 199, value() returns 199
Hit Tab key - text() returns 199, value() returns 199
Hit Enter key - text() returns 4, value() returns 199
With Kendo UI versions after 2018.2.516 pressing the Tab key outputs the same result as pressing the Enter key.

Current behavior
An incorrect item from dataSource is being selected on Enter keypress.

Expected/desired behavior
Selection modes should return same item.

Kendo UI version: 2018.2.516
Browser: [all]
Last Updated: 05 Sep 2019 10:39 by ADMIN


we found a hard to reproduce bug in the combobox control. It appears infrequently while typing in the combobox input, if the combobox has grouping and the fixed header enabled. It does not seem to have functional implications to the control but it produces a javascript error.


_firstVisibleItem: function () {
    for (var t = this.element[0], n = this.content[0], i = n.scrollTop, r = e(t.children[0]).height(), o = Math.floor(i / r) || 0, a = t.children[o] || t.lastChild, s = a.offsetTop < i; a; ) if (s) {
      if (a.offsetTop + r > i || !a.nextSibling) break;
      a = a.nextSibling
    } else {
      if (a.offsetTop <= i || !a.previousSibling) break;
      a = a.previousSibling
    return this._view[e(a).data('offset-index')]

It seems to be a timing problem where the list is already loading again while the scroll from the item selection is not finished.