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Breaking Changes / 2023 Releases
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2023 Releases

Updated on Aug 18, 2025

This article lists the breaking or important changes in the 2023 releases of Kendo UI. For the complete list of changes in the UI components, see the product release history.

Kendo UI 2023 R1 SP1

  • Drop of the development and support of the LESS themes.

Unified Rendering

As of the 2023 R1 SP1 release, to unify their support for the new ThemeBuilder Pro, the following components have changed their rendering:

The majority of the rendering changes can also be found within the existing test HTML specifications coming from the Kendo UI Themes Monorepo. The tests folder contains HTML specifications for all flavour of the components. The components follow the rendering strategy outlined in the specifications.

State Classes

All k-state-{name of state} classes are transposed to k-{name of state}. A list of all the updated state classes can be found in the existing State Classes article.

Animation Containers

  • Animation containers are all components that represent or hold a popup, for example, the Grid filter menu and column, and popup editor, Tooltip, SplitButton, DropDownList, and more.
  • The .k-animation-container elements are now holding another wrapping element with the .k-child-animation-container class.

PanelBar

The text and icon of the items are wrapped within two separate <span> elements annotated with the .k-panelbar-item-text and .k-panelbar-item-icon classes.

The text of the items are wrapped within a standalone <span> element annotated with the .k-menu-link-text class.

The component's value is wrapped within a <span> element annotated with the .k-input-value-text.

Grid

All rendering changes in the Grid also apply to the FileManager, TreeList, Gantt, and PivotGrid as these components use the Grid internally.

  • The following command classes have been renamed:

    Versions prior to 2023.1.314Versions 2023.1.314 and later
    k-grid-editk-grid-edit
    k-grid-updatek-grid-save-command
    k-grid-cancelk-grid-cancel-command
    k-grid-cancelk-grid-cancel-command
    k-grid-deletek-grid-remove-command

  • The following classes table-specific classes have been added to the table elements:

    Versions prior to 2023.1.314Versions 2023.1.314 and later
    <table><table class="k-table">
    <thead><thead class="k-table-thead">
    <tbody><tbody class="k-table-tbody">
    <tfoot><tfoot class="k-table-tfoot">
    <th><th class="k-table-th">
    <tr><tr class="k-table-row">
    <tr> alt rows<tr class="k-table-alt-row">
    <td><td class="k-table-td">

  • Except for the popups, the sizing option now propagates to all elements inside the Grid. These include the table, toolbar, pager, buttons, inputs, pickers, chip lists, and more.

  • The .k-widget class is now removed from the .k-grid element.

  • The sorting icons will be replaced with their .k-i-sort-asc-small and .k-i-sort-desc-small general names instead of their .k-i-sort-asc-sm and .k-i-sort-desc-sm aliases.

  • The sorting icon is now wrapped in a <span> element:

    html
    <span class="k-sort-icon">
      <span class="k-icon k-i-sort-asc-small"></span>
</span>

  • The headings of the Grid are now updated with the new header rendering:

    Pre-Unified-Rendering
        <!--- Default header cell --->
    <th class="k-header">
            <a class="k-link">
                ProductName
            </a>
    </th>

    <!--- Header cell with sorting--->
    <th class="k-header k-sorted">
            <a class="k-link">
                ProductName
                <span class="k-icon k-i-sort-asc-sm"></span>
            </a>
    </th>

    <!--- Header cell with filter menu--->
    <th class="k-header k-filterable">
         <a class="k-grid-filter">
            <span class="k-icon k-i-filter"></span>
         </a>
         <a class="k-link">
                ProductName
         </a>
    </th>

    <!--- Header cell with column menu--->
     <th class="k-header">
         <a class="k-header-column-menu">
            <span class="k-icon k-i-more-vertical"></span>
         </a>
         <a class="k-link">
                ProductName
         </a>
    </th>

  • By default, the table elements inside the Grid are of medium-sized. The .k-table-md class is added to the .k-table element.

  • The .k-grid-header-table , .k-grid-table, and .k-grid-footer-table Grid-specific classes are now added to the header, body, and footer tables.

  • The Grid uses internally the Toolbar component and follows the it's accessibility specification. The ToolBar is a single tab stop component and when navigation is enabled via the navigatable:true configuration, pressing the Tab key navigates to and from the Toolbar. When the Toolbar is focused, navigating to the previous or next focusable element is achieved via the arrow keys.

TabStrip

The k-floatwrap class has been removed from the TabStrip.

ListView

  • The .k-pager-wrap class is now removed from the .k-pager element.
  • The .k-listview-item wrapper is now added to the item templates.
  • The .k-listview-item class is now removed from the item template children.
  • The .k-item class is now replaced with .k-progressbar-chunk.

ProgressBar

  • The .k-widget class is now removed.
  • A .k-chunk-progressbar class has been added to the Chunk ProgressBar.
  • The .k-progressbar-chunks class has been added to the <ul> element.
  • An additional .k-progressbar-value class is now added to the <div> element with the .k-selected class in the default ProgressBar.

CheckBox

The CheckBox is wrapped in a <span> element annotated with the .k-checkbox-wrap class.

Notification

  • The .k-widget class is now removed.

  • The k-notification-wrap class has also been removed.

  • The closable <a class="k-icon k-i-close"></a> notification icon is now replaced with a <span> element and the icon class .k-i-close name has been changed to .k-i-x.

    html
    <span class="k-icon k-i-x">...</span>

  • A .k-notification-actions container added wrapping to the closable icon.

    html
    <span class="k-notification-actions">
    <span class="k-notification-action k-notification-close-action">
        <span class="k-icon k-i-x">...</span>
    </span>
    ...
</span>

Button

The .k-button-rectangle class is now removed.

  • The Upload button and input are no longer nested but are on one level, wrapped inside a <div> element.

    Versions-Before-2023.1.314
        <div class="k-button k-upload-button" aria-label="Select files...">
        <input name="files" id="upload-input">
        <span>Select files...</span>
    </div>

  • The following classes related to the Telerik UI for Upload have been renamed:

    Versions prior to 2023.1.314Versions 2023.1.314 and later
    k-file-groupk-file-icon
    k-file-name-size-wrapk-file-info
    k-file-name-invalidk-file-name
    k-file-informationk-file-summary
    k-file-group-wrapperk-file-icon-wrapper
    k-file-invalid-group-wrapperk-file-icon-wrapper
    k-multiple-files-invalid-group-wrapperk-file-icon-wrapper
    k-dropzone-hoverk-hover
    k-dropzone-hoveredk-hover

  • The .k-widget class is now removed from the .k-upload element.

  • All <em> and <strong> elements have been replaced with span or <div> elements.

  • A .k-upload-dropzone class has been added to the .k-dropzone element.

  • The .k-upload-status-total class has been removed from the .k-upload-status element.

  • The .k-validation-icon class is now removed from the .upload-status icon.

  • The .k-file-error class has been added to .k-file-invalid.

  • .k-file-single and .k-file-multiple wrapper elements have been added inside the .k-file element for single and multiple files respectively.

  • The .k-file-name-invalid class has been removed from the .k-file-name element.

  • The .k-text-success and .k-text-error classes have been removed from the .k-validation-message element.

  • The Upload action buttons are no longer wrapped in a .k-upload-status class but in the .k-upload-actions class.

  • The progress bar is now replaced with the ProgressBar component without visible labels.

Pager

  • The .k-widget class is now removed from the .k-pager element.
  • The .k-pager-numbers element is now a <div> element.
  • The <a class="k-link k-page-nav"></a> navigation buttons have been replaced with <button class="k-pager-nav k-button k-button-{size} k-button-flat k-button-flat-base k-icon-button">...</button> flat buttons.
  • The <span class="k-link></span> page numbers are now replaced with <button class="k-button k-button-{size} k-button-flat k-button-flat-primary">...</button> flat primary buttons.
  • The .k-link class is now removed from the component.
  • The .k-pager-wrap class selector is now removed.
  • The .k-pager-mobile-md and .k-pager-mobile-sm classes are added when internal Pager elements are shown or hidden.

Toolbar

  • The .k-widget class is now removed from the .k-toolbar element.
  • The .k-toolbar-resizable class is added when the Toolbar is responsive.
  • The .k-overflow-anchor class has been replaced with the .k-toolbar-overflow-button class.

Window

  • The .k-window-titleless class is now removed.
  • The .k-window-actions class in the title bar has been replaced with .k-window-titlebar-actions.
  • The .k-window-buttongroup and .k-window-buttons classes are replaced with .k-window-actions.
  • The .k-window-titlebar-action class is added to action buttons inside the title bar.
  • The .k-dialog-{something} classes are removed from the component.

Dialog

  • A .k-window class is now added to the component.

  • The .k-dialog-actions class in the title bar has been replaced with the .k-dialog-titlebar-actions class.

  • The .k-window-titlebar-action and .k-dialog-titlebar-action classes have been added to the action buttons.

  • The .k-dialog-buttongroup and .k-dialog-buttons classes are now replaced with .k-dialog-actions.

  • A new .k-dialog-{value} theme color property has been added to the .k-window element. It supports the primary, dark, and light theme colors.

    html
    <!-- Primary themeColor -->
<div class="k-window k-dialog k-dialog-primary">...</div>

<!-- Dark themeColor -->
<div class="k-window k-dialog k-dialog-dark">...</div>

<!-- Light themeColor -->
<div class="k-window k-dialog k-dialog-light">...</div>

Editor

  • As of R1 2023 SP1, the Editor features an improved method to register custom tools. The main difference from the previous implementation is the substitution of the ToolTemplate instance with a ui configuration object. An example of the new approach of registering tools is available in the knowledge-base article on creating custom Editor tools.

  • The Editor no longer allows the use of togglable and non-togglable buttons in the same ButtonGroup of its ToolBar. If such a configuration is present, all buttons will be rendered as simple (non-togglable) buttons.

  • The break pseudo tool is no longer needed for separating tools from the same logical group. To display such tools separately, place them in separate arrays in the tools configuration:

        <textarea id="editor" rows="10" cols="30" style="width:100%; height: 440px;"></textarea>
    $("#editor").kendoEditor({
        tools: [
            ["bold"],
            ["italic"],
            ["underline"],
            ["strikethrough"]
        ]
    });

    You can also group multiple tools in a group by following the same approach:

        <textarea id="editor" rows="10" cols="30" style="width:100%; height: 440px;"></textarea>
    $("#editor").kendoEditor({
        tools: [
            ["bold", "italic"],
            ["underline", "strikethrough"]
        ]
    });

  • The table element has been replaced with a <div> element.

  • The toolbar is no longer wrapped inside the .k-editor-toolbar-wrap element.

  • The toolbar is no longer a <ul> with <li> elements, but a Toolbar component.

  • The .k-editor-toolbar class is now added to the toolbar.

  • The .k-resizable class has been replaced with the .k-editor-resizable one.

Editor Popup

  • Instead of the Dialog component, all Editor popups now use the Window.
  • The .k-editor-window has been added to all popups.
  • All inputs in popups have been replaced with the TextBox, NumericTextBox, and other respective components.
  • Instead of the .k-edit-form-container, .k-edit-form-content, .k-edit-label classes, and similar classe, the Form component is now used inside the popups.
  • Action buttons have been moved outside the form.
  • The .k-editor-table-wizard-dialog class has been replaced with the .k-editor-table-wizard-window class.

Calendar and MultiViewCalendar

  • The text of the title buttons is now wrapped in a <span> element with the .k-button-text class.

  • The navigation classes have been replaced as follows:

    js
    k-nav-today k-calendar-nav-today
k-nav-prev k-calendar-nav-prev
k-nav-next k-calendar-nav-next
k-nav-fast k-calendar-nav-today
k-prev-view k-calendar-nav-prev
k-next-view k-calendar-nav-next

Kendo UI 2023 R1

ToolBar

  • As of the R1 2023 release, the tools in the ToolBar are actual component instances instead of ToolBar items. As a result, the click and toggle event argument objects no longer hold a reference to the ToolBar item (e.item). From that release on, the component instance of the tool can be taken by using the kendo.widgetInstance() method. When rendered in the OverflowMenu or the popup of a DropDownButton or a SplitButton those tools are menu items. Hence, they are not Kendo UI controls. A reference to the jQuery elements is still available in those cases in the e.target event argument.

    html
        <div id="toolbar"></div>
    <script>
        $("#toolbar").kendoToolBar({
            items: [
                { type: "button", id: "btn1", text: "Button 1", togglable: true },
                { type: "button", id: "btn2", text: "Button 2" }
            ],
            click: function(e) {
                console.log("click:");
                console.log(kendo.widgetInstance(e.target));
            },
            toggle: function(e) {
                console.log("toggle: ", e.checked);
                console.log(kendo.widgetInstance(e.target));
            }
        });
    </script>

  • The ToolBar buttons will always be rendered as <button> elements (instead of <a>) unless they have a url configured in their options. If a url is present, those will be rendered as links (<a>).

  • The ToolBar no longer requires you to register its custom tools. To explore the new simplified way of defining custom tools in the ToolBar, refer to the article about the custom tools of the ToolBar.

  • The ToolBar won't allow you to use togglable and non-togglable buttons in the same ButtonGroup. If such a configuration is present, all buttons will be rendered and behave as simple (non-togglable) buttons.

  • The ToolBar Overflow menu will open upon each of its button clicks. That is the behavior of the ContextMenu component used in that scenario.

In this article
Kendo UI 2023 R1 SP1Unified RenderingState ClassesAnimation ContainersPanelBarMenuDropDownListGridTabStripListViewProgressBarCheckBoxNotificationButtonPagerToolbarWindowDialogEditorEditor PopupCalendar and MultiViewCalendarKendo UI 2023 R1ToolBar
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