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Known Issues and Important Changes

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Telerik Admin asked on 24 Jan 2012, 10:59 AM | edited on 20 May 2025, 02:19 PM

This sticky thread lists known issues and breaking changes introduced in the UI for ASP.NET AJAX releases.

Q3 2011 (Version number: 2011.3.1115)

Problem: When adding items to OData-enabled controls (RadMenu, RadTreeView, RadListBox, RadComboBox) through design time erroneous markup is applied to the control:

<telerik:RadListBox runat="server" ID="RadListBox1">
    <Items>
    </Items>
    <WebServiceSettings>
        <ODataSettings InitialContainerName="">
        </ODataSettings>
    </WebServiceSettings>
</telerik:RadListBox>

Please note the added ODataSettings section. It will cause JavaScript errors on the page.

Solution: Remove the ODataSetting section and the issue will vanish. The problem is also fixed in the Q3 SP1 release, version number 2011.3.1305

43 Answers, 1 is accepted

answered on 18 Apr 2013, 03:02 PM

Q1 2013 (Version number: 2013.1.220)

Important changes:

RadButton
What is changed: RadButton's rendering so it is HTML5 compliant. The change is described in this forum thread.

RadEditor
What is changed: Raises domChange event for every newly created link in InsertLinkCommand. The change is described in this forum thread.

RadGrid
What is changed: Properties for invisible columns are not persisted in ViewState. The change is described in this forum thread.

RadImageEditor
What is changed: RadImageEditor New Tools sprites are placed in Skins common folder. Until the change we were using different sprite for each skin, which is too resource consuming. Currently there are only two sprites for the tools - Dark or Light Sprite, which are used depending on the skin.

RadWindow

Misplaced titlebar after autosizing when in RTL mode and RenderMode=Classic—fixed as of R2 2017 SP1.

answered on 28 May 2013, 02:08 PM

Q2 2013 (Version number: 2013.2.611)

Important changes:

RadAsyncUpload
Improved: In order to upload files bigger than 2GB the type of the ContentLength properties in the AsyncUpload is changed to Int64.

RadComboBox
Changed: Image element is rendered after the checkbox element. The change is made in order to be consistent with the rest of controls.

RadEditor
Changed: The Track Changes dialog of RadEditor is now obsolete. Use the EnableTrackChanges property to enable an improved track changes functionality that offers better interaction and usability.
Improved: The insert list command in RadEditor.
Improved: The Align command in RadEditor to be consistent x-browser.
Improved: Indent/Outdent command in RadEditor. Now uses CSS styling instead of <blockquote> tags to indent block content

These commands use pure DOM manipulations and do not rely on the underlying browser commands. The behavior thus is consistent across browsers and differs from the way these commands have been working thus far.
Please, keep in mind that these commands manipulate block nodes and lines separated by <br/> tags are still within a common block container, therefore lines separated by line breaks will be handles together by the InsertList, Align, Indent and Outdent commands.

RadGrid
Changed: When grouping a RadGrid field with Aggregate set to Count the DataType of the aggregate column is changed from decimal to int.

RadFormDecorator
Changed: The text inputs decorated with RadFormDecorator now have fixed height for consistency with RadInput.

RadHtmlChart
Changed: The Items property for manipulating series items of the RadHtmlChart is obsolete and it is replaced by the SeriesItems property. SeriesItems is the improved and fine-grained approach to managing series items in the RadHtmlChart.
Changed: The background of the tooltip is now determined by the series item's color. The change is made for better consistency with the appearance setup of the series item.

answered on 26 Feb 2014, 12:02 PM

Q1 2014 (Version number: 2014.1.225)

All Controls
Changed: The obsolete built-in skins Transparent, Hay, Forest and Sitefinity have been removed from the Telerik.Web.UI.Skins assembly as of the Q1 2014 release of Telerik UI for ASP.NET AJAX (version 2014.1.225).

If you are using any of these skins in your project and you want to upgrade to the latest version, there are two options:

You can configure the Telerik controls to use one of the newer skins that we introduced recently, instead of the obsolete ones.
You can modify one of the existing skins in order to create a new one that will have the name and appearance of your choosing. The Visual Style Builder will be quite useful for this purpose.

Changed: ODataSettings part of the WebServiceSettings, used by the RadComboBox, RadListBox, RadMenu and RadTreeView are now obsolete.

Please use the RadODataDataSource control instead, as shown in the following demos:

answered on 18 Jun 2014, 05:19 PM

Q2 2014 (Version number: 2014.2.618)

RadDiagram
Changed: Remove the "Client" string from the prefix of the client event names in RadDiagram, i.e. OnClientSelect becomes OnSelect. You can check how to configure the events in the following help article: http://www.telerik.com/help/aspnet-ajax/diagram-client-side-events.html

RadEditor
Changed: The default value of the NewLineMode property is changed to P. You can find more information in the following feedback item: http://feedback.telerik.com/Project/108/Feedback/Details/53978

RadTagCloud
Changed: MaxFontSize and MinFontSize properties of TagCloud should be set in the same unit type. Their default values are set in UnitType.Em.

answered on 27 Oct 2014, 01:02 PM

Q3 2014 (Version number: 2014.3.1024)

RadDiagram

Replaced DataBackgroundField property in BindingSettings.ShapeSettings with DataFillColorField.
Replaced ShapeDefaultsSettings.Background with ShapeDefaultsSettings.FillSettings.Color.
Replaced DataHoverBackgroundField property in BindingSettings.ShapeSettings with DataHoverFillColorField.
Replaced HoverSettings.Background property in a DiagramShape with HoverSettings.FillSettings.Color.
Replaced Rotatable and Resizable properties of the Diagram and in the ShapeDefaultsSettings composite property with EditableSettings.Rotate and EditableSettings.Resize.
Replaced Background property of a DiagramShape with a fine-grained FillSettings composite property.
DiagramConnectionPoint class is now used instead of ConnectionPoint class.
ZoomRate property of the Diagram now defines the zoom step instead of the zoom scale altogether. The default value of this property is changed from 1.1 to 0.1.

RadEditor

Due to legacy code refactoring the RadEditorCommandList global object is now obsolete. Use Telerik.Web.UI.Editor.CommandList full name instead, as explained in this documentation article.

RadHtmlChart

The OnClientSeriesClicked and OnClientSeriesHovered events of RadHtmlChart are now obsolete. Use the OnSeriesClick and OnSeriesHover events in the ClientEvents composite property instead, as shown in the following help article: http://www.telerik.com/help/aspnet-ajax/htmlchart-client-side-events.html

Changed: The div element which wraps chart's tooltips is not rendered inside the chart anymore but as the bottom element of the body. If the chart is placed inside a pop-up element (e.g. RadWindow, RadNotification, etc) with a higher z-index tooltips will be hidden behind it. You must ensure a higher z-index for the tooltips, as illustrated in the Common Issues help article, in the section called "Тooltips are Hidden Behind RadWindow and/or RadNotification".

RadGrid

The Columns collection of the Export Infrastructure is not populated by columns that do not have HeaderStyle.Width set. This can cause issues with formatting an Excel export file if you loop through the e.ExportStructure.Tables(0).Columns collection - it may return 0 or a number smaller than the number of columns.

answered on 09 Mar 2015, 02:07 PM

Q1 2015 (Version number: 2015.1.225)

RadCalendar

SpecialDays cannot be deselected visually when they have CssClass defined

RadDock
The command buttons of RadDock are span elements instead of button elements when RenderMode="Lightweight".

RadEditor

Remove the Iframe which holds the textarea element in HTML mode.
Strip content functionality now uses DOM operations.
Modifying inline commands to handle formatted block elements.

RadSpell
Convert RadSpell args.suppressCompleteMessage field in the clientCheckFinished event to a method.

RadToolTip
Change default value of RadTooltip's RenderInPageRoot property to True.

RadWindow
The command buttons of RadWindow are span elements instead of button elements when RenderMode="Lightweight".

ZipLibrary
ZipPackage has been deprecated, but you can use ZipArchive instead. The ZIP archive is represented by ZipArchive class and it can be used in 3 modes (Read, Create and Update). For more information about them you can refer to the article below:
http://www.telerik.com/help/aspnet-ajax/ziplibrary-getting-started.html

PdfProcessing
RadFixedDocumentEditor's TableProperties are removed.

answered on 31 Jul 2015, 08:23 AM

Q2 2015 (Version number: 2015.2.623)

RadFileExplorer

Ability to set the RadFileExplorer paths (ViewPaths, UploadPaths, EditPaths) before PagePreRender and after PageLoad.
RadAsyncUpload is the default upload tool.

Q2 2015 SP1 (Version number: 2015.2.729)

RadPivotGrid

A regression problem has been found in this build. It is related to the PivotGrid horizontal scrolling and you can fix it using the following class:

.RadPivotGrid .rpgContentZoneDiv

{

overflow: hidden;

}

More information is available here : http://www.telerik.com/forums/radpivotgrid-scrollbar-does-not-work-in-q2-2015-sp1-release

RadToolTip

The tooltip is not showing if its content is empty. You can find more information on the matter in the sticky thread below:
http://www.telerik.com/forums/imortant-chnage-radtooltip-will-not-show-up-if-content-is-empty

answered on 25 Nov 2015, 07:42 AM

Q3 2015 SP1 (Version number: 2015.3.1111)

Common

There is a issue, causing wrong order of script registrations in the header on the page. Possible impacts:

1. JS erros on the page, such as: $ is not defined.
2. Inability to load styles on the page.

The issue is already fixed as from our 2015.3.1124 internal build. Fixed as of Q1 2016.

RadButton

RadButton with RenderMode=Lightweight will not raise its OnClick event if it performs an AJAX request and the text is clicked under Chrome and Edge. This will be fixed in the Q1 2016 release and the fix will be available in the 2015.3.1124 internal build. You can find more details in the following sticky thread: The server-side OnClick event is not raised when clicking on the Button text (Lightweight RenderMode, Chrome/Edge browsers, Q3 2015 SP1 release).

TileList

There are some issues with the events under mobile devices when Lightweight RenderMode is used. Thus, navigation requires a double tap and there are problems with taps and dragging. These will be fixed in Q1 2016 and in all internal builds after the 25^th of November 2015.

answered on 25 Feb 2016, 03:08 PM

Q1 2016 (Version number: 2016.1.113)

RadButton

The CommandName and CommandArgument of RadButton are not available in the ClientClicking eventargs

This bug is fixed in Q1 2016 SP1.

Possible workaround is to use the sender parameter to obtain the CommandName and CommandArgument:

<script type="text/javascript">

    function btnEdit_Clicking(sender, eventArgs) {

        alert(sender.get_commandName());

        alert(sender.get_commandArgument());

    }

</script>

<telerik:RadButton ID="RadButton2" AutoPostBack="false" runat="server" Text="Click Me" OnClientClicking="btnEdit_Clicking" CommandArgument="Name"></telerik:RadButton>
AccessKey doesn't work in IE11 using Lightweight rendering

This bug is fixed in Q1 2016 SP1.

RadSplitter

The client docking events of RazSlidingZone are not triggered properly

This bug is fixed in Q1 2016 SP1.

The client events of RazSlidingZone are not triggered properly when the zone is placed in a nested Splitter.
Sliding zone tabs text is upside down in Firefox

This bug is fixed in Q1 2016 SP1.

You can download an example with a workouround from the linked item or via this download link—http://feedback.telerik.com/AttachmentDownload/24565.

RadTileList

TileList OnTileClick handler does not work in data binding scenario

This bug is fixed in Q1 2016 SP1.

answered on 08 Mar 2016, 09:41 AM

Q1 2016 SP1 (Version number: 2016.1.225)

Common

Important change: In the Lightweight Render Mode all UI for ASP.NET AJAX controls do not have a default font any more. This means the controls do not have font-size, font-family, font-weight and font-style predefined and inherit the font-size of the <body> element if such is set. Otherwise, the default browser values apply. This provides all Telerik controls on the page with the same look and feel by making use of their elastic design capabilities. You can find additional details in the following resources:
- Fonts
- Visual and Dimension Improvements in UI for ASP.NET AJAX

RadWindow

RadWindow with AutoSize=true is not positioned properly. Fixed as of R2 2016.

Fix: Use OnClientAutoSizeEnd event and call the center() method to position RadWindow properly.

<script>

    function OnClientAutoSizeEnd(sender, args) {

        sender.center();

    }

</script>

<telerik:RadWindow ID="RadWindow1" runat="server" OpenerElementID="Button1"

    AutoSize="true" Modal="true" OnClientAutoSizeEnd="OnClientAutoSizeEnd">

    <ContentTemplate>

        <div style="width: 600px; height: 400px; background: yellow;">

            dummy content for autosizing

        </div>

    </ContentTemplate>

</telerik:RadWindow>

<asp:Button ID="Button1" Text="open RW" runat="server" />
Lightweight RadWindow with RestrictionZoneID and overflow hidden parent jumps on dragging under FireFox. Fixed as of R2 2016.

Symptom: When dragged, RadWindow jumps to most top-left position possible. Instead of being dragged to the position where mouse is pointed to.
JavaScript error on opening a Classic RadWindow with enabled AutoSize and AutoSizeBehaviors Height/HeightProportional. Fixed as of R2 2016.

Symptom: No content is being loaded into RadWindow when shown.

RadImageEditor

It is not possible to draw in IE and Edge on mobile devices in RadImageEditor. Fixed as of R2 2016.

Symptom: In a mobile device, drawing on the canvas of ImageEditor does not lead to any changes on the image to be edited.

Fix: Hard-coding touch-action:none CSS property as inline style.

<telerik:RadImageEditor ID="RadImageEditor" runat="server" style="touch-action:none;"></telerik:RadImageEditor>

RadMenu

Styling changes in Metro and MetroTouch skins in Lightweight RenderMode for RadMenu, introduced with Q1 2016.1.225 SP1 release

Symptom: The styling of the Metro and MetroTouch Lightweight skins of the RadMenu has changed.

Fix: Use the suggested in the article CSS rules to revert back to the look of the skins before the Q1 2016 SP1 release.

RadPanelBar

Styling changes in MetroTouch skin in Lightweight RenderMode for RadPanelbar, introduced with Q1 2016.1.225 SP1 release

Symptom: The styling of the MetroTouch Lightweight skin of the RadPanelBar has changed.

Fix: Use the suggested in the article CSS rules to revert back to the look of the skin before the Q1 2016 SP1 release.

answered on 17 May 2016, 07:22 AM

R2 2016 (Version number: 2016.2.504)

RadEditor

The DialogsCssFile property breaks the appearance of a custom skin - When setting the DialogsCssFile property, the generated markup of the RadEditor wrapper changes from

Radeditor RadEditor_<MyCustomSkin> reWrapper to Radeditor <MyCustomSkin> reWrapper, which prevents the custom skins to get applied to RadEditor.

To fix the problem explicitly set the RenderMode property of RadEditor to "Lightweight", i.e.

<telerik:RadEditor RenderMode="Lightweight" DialogsCssFile="~/MyCustomSkin/DialogContents.css" ID="RadEditor1" runat="server" Skin="MyCustomSkin" EnableEmbeddedSkins="false">

<ImageManager ViewPaths="~/" UploadPaths="~/" />

</telerik:RadEditor>
Using ToolsFile property from the markup disregards Lightweight rendering configured from the web.config.

Logged item: http://feedback.telerik.com/Project/108/Feedback/Details/191004. Fixed as of R2 2016 SP1.

Description: When you enable Lightweight rendering from the web.config and having a RadEditor control with ToolsFile in the markup, Classic mode will resolved and rendered.

Workarounds: You cna setup the ToolsFile.xml in the code behind:

RadEditor1.ToolsFile = "~/ToolsFile.xml";

RadWindow

Calling set_modal(true) on a modal RadWindow makes it non-modal.

Simple example of the problem:

<telerik:RadWindowManager ID="RadWindowManager1" runat="server" Modal="true"></telerik:RadWindowManager>

<asp:Button ID="Button1" Text="test" OnClientClick="test(); return false;" runat="server" />

<script>

    function test() {

        var wnd = radopen();

        wnd.set_modal(true);

    }

</script>

A workaround is to add a check first:

if (!wnd.get_modal()) {

    wnd.set_modal(true);

}

This issue is fixed in R2 2016 SP1.

answered on 23 Sep 2016, 12:46 PM

R3 2016 (Version number: 2016.3.914)

RadComboBox

ComboBox with LoadOnDemand causes infinite requests when "(" is searched. Fixed as of R1 2017 SP1.
ComboBox with LoadOnDemand causes infinite requests when ~ or a second ' is searched. Fixed as of R1 2018.

RadGrid

Filtering issue with AutoPostBackOnFilter property. Fixed as of R1 2017.
resizeToFit() method causes a script error. Fixed as of R1 2017.
Filtering error with CheckList and Combined mode when using server-side binding for the ListBox:

'Value' is not supported filter function for GridBoundColumn. Custom filter functions must be handled in the ItemCommand event handler. Set e.Canceled=true to stop the built-in filtering.

RadFormDecorator

Double checkbox and radio button icons under Chrome, Safari and Edge with certain DecoratedControls combinations under Classic Render Mode. The easiest workaround is to use the Lightweight RenderMode. This issue will be fixed in R3 2016 SP1.

answered on 19 Oct 2016, 02:47 PM

editor-workarounds.zip

R3 2016 SP1 (Version number: 2016.3.1018)

RadEditor

Uncaught TypeError: this._contextMenuFunctionality.dispose is not a function (Chrome) or Object doesn't support property or method 'dispose' (IE) error is thrown when a RadEditor with RenderMode=Classic is disposed on a page that uses RadScriptManager with EnableScriptCombine=true. There are three workarounds provided in the article above and in the attachment to this post. Fixed in R3 2016 SP2 (2016.3.1027).

RadFileExplorer

The toolbar delete button is enabled only if the selected item's parent folder can be deleted. A workaround is provided in the item. Fixed as of R1 2017.

answered on 23 Jan 2017, 02:56 PM

R1 2017 (Version number: 2017.1.118)

RadButton, RadFormDecorator

Broken WebResource request caused by a missing image (radFormSprite.png). Fixed as of R2 2017.
Whitespace or broken font icon on radio buttons when RenderMode=Classic and a RadControl with RenderMode=Lightweight is on the page. Fixed as of R3 2017 SP1, does not exist in R2 2017.

RadComboBox

Missing indication for loaded items in RadComboBox MoreResultsBox. Fixed as of R2 2017.

RadGrid

OnCommand is not fired when ConfirmDialogType="RadWindow". Fixed as of R1 2017 SP1.

RadNotification

The close icon is missing in Classic render mode with Skin=Bootstrap. Fixed as of R2 2017 SP1.

RadProgressBar

Skins are not downloaded, a 404 request is sent for the SASS file (fixed as of R2 2017).

RadSplitter

Missing skin colors in sliding panes as of R1 2017 (fixed as of R2 2017).

RadTileList

Missing colors and background colors for many skins (fixed as of R2 2017).

RadToolTip

Missing colors and backgrounds in some skins (fixed as of R2 2017): .
Whitespace between callout and body in Classic RenderMode. Workaround for Bottom positions:

div.rtShadow.RadToolTip_Metro div.rtCalloutTopLeft,

div.rtShadow.RadToolTip_Metro div.rtCalloutTopRight

{

margin-top: -7px;

}

RadWindow

Wrong colors for some skins (Classic RenderMode is fixed as of R2 2017, Metro colors for the Lightweight mode are fixed as of R2 2017 SP1).
Wrong order of buttons in RTL mode in Lightweight RenderMode (fixed as of R2 2017).
Command buttons (e.g., Close) appear to not work after maximizing a RadWindow that does not have the Maximize or Resize behavior enabled. Happens due to a JS error. Fixed as of R1 2017 SP1.
RadAlert/RadConfirm in mode: removing the icon, or setting a custom one, keeps showing the default icon (fixed as of R2 2017).

answered on 06 Mar 2017, 11:12 AM

R1 2017 SP1 (Version number: 2017.1.228)

RadButton

Checked checkboxes have misplaced backgrounds (fixed as of R2 2017).
Distorted appearance in Classic RenderMode.

RadMenu

The selected menu item is gray instead of yellow when RadMenu has a Glow skin in Classic render mode (fixed as of R2 2017 SP1)
When a control inside a Template is focused, the focus of the nested control is immediately lost (fixed as of R2 2017).

RadSplitter, RadFileExplorer and RadEditor dialogs

Gray background in RadSplitter, RadFileExplorer and RadEditor dialogs with RenderMode Classic and Default/Silk/Bootstrap .

RadWindow

Controls like RadTreeView, RadTabStrip and other UL elements in RadWindow float to the right under Firefox 52 and Chrome 58, because the browsers started reading a CSS rule differently. Fixed as of R2 2017.

answered on 18 Jan 2018, 03:19 PM

R1 2018 (Version number: 2018.1.117)

Common

The Telerik.Web.Design.dll assembly is no longer added to the GAC by the automated installer and this can cause design-time errors if you upgrade via the Upgrade Wizard and your project did not have an explicit reference to the Telerik.Web.Design.dll file in the project folder. You can read more in this section of the documentation: Error Creating Control Failed To Create Designer after upgrade to R1 2018.

*** Updated on March 7, 2018 ***

The issue is already fixed in version 2018.1.215.2 of Telerik ASP.NET AJAX VSExtensions
From the Release notes -> Telerik.Web.Design.dll is not added to the Bin folder of a newly created Telerik AJAX site/app.

To fix the problem:

Download the latest Telerik ASP.NET AJAX VSExtensions installation from the VS Marketplace, install it and restart your Visual Studio.
or Wait for the next official R2 2018 release of Telerik UI for ASP.NET AJAX, to be out in May.
or Place manually the Telerik.Web.Design.dll in the Bin folder of the app

*** End of update ***

RadFileExplorer

You may be unable to rename files or to drag-and-drop files to the treeview to move them. Both of these features internally go through the Rename feature and its security was improved for R1 2018. If rename or move does not work for you, there are several likely reasons:

The user does not have permissions to write to that folder. To allow the operation, the current folder must be present in the DeletePaths and UploadPaths.
The file extension that is entered is not present in the SearchPatterns, which means that the user should not be able to tamper with such files.
Some custom content providers that use some form of IDs instead of physical paths may be unable to move or rename files even when permissions are in order. This will be fixed in R2 2018. Note that the custom provider must implement all necessary methods, including GetFileName(path).

answered on 01 May 2018, 04:10 PM

Telerik-Web-UI-d-ts.zip

R2 2018 (Version number: 2018.2.516)

All known regression issues in this release are fixed in R2 2018 SP1.

Common

The jQuery version that is embedded in the Telerik.Web.UI.dll assembly is upgraded to 3.3.1.
This is done to improve stability, compatibility with modern browsers and security, as well as optimize by dropping support for browsers like IE7 and IE8 that the UI for ASP.NET AJAX suite has not been supporting for years. This upgrade will allow the controls to stay up to date with modern web development and current standards.

This change applies to the window.$telerik.$ variable and to the global jQuery references only if you manually populate them through code similar to window.$ = $telerik.$; or if you have the following script reference <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js" />
You may find useful the migration guide provided by jQuery: https://jquery.com/upgrade-guide/3.0/.

If you want to use a different version of jQuery (including downgrade to version 1.11.1), follow the Disabling the Embedded jQuery article.

If you get errors like access to strict mode caller function is censored especially under Firefox, the solution is to downgrade to jQuery 1.11.1 that the suite used before. Below is some sample markup.

You can open a support ticket and get a build of R2 2018 that has jQuery 1.12.4 in it instead of 3.3.1. You can use it to test whether it resolves the issues you are facing, as this will be the official solution that will be available in R2 2018 SP1.

How to disable the built-in jQuery 3.3.1 and use 1.11.1:

<head runat="server">

<title></title>

<script src="http://code.jquery.com/jquery-1.11.1.js"></script>

</head>

<body>

<form id="form1" runat="server">

<telerik:RadScriptManager ID="RadScriptManager1" runat="server" EnableEmbeddedjQuery="false">

<Scripts>

<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js" />

<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryExternal.js" />

<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryPlugins.js" />

</Scripts>

</telerik:RadScriptManager>

Here follows a list of the known issues caused by jQuery3

RadAjaxPanel

jQuery button click in RadAjaxPanel under FireFox causes TypeError: access to strict mode caller function is censored. This is caused by the 'use strict' that jQuery 3 begins with. Fixed in R2 2018 SP1.

RadAutoCompleteBox

Dropdown extends to the left and screen boundary detection to the left does not work in R2 2018. This is caused by the 'use strict' that jQuery 3 begins with. Fixed in R2 2018 SP1.

RadDropDownList

Cannot postback under Firefox, TypeError: access to strict mode caller function is censored is thrown. This is caused by the 'use strict' that jQuery 3 begins with. Fixed in R2 2018 SP1.

RadFileExplorer

Cannot rename files under Firefox, TypeError: access to strict mode caller function is censored is thrown. This is caused by the 'use strict' that jQuery 3 begins with. Fixed in R2 2018 SP1.

Cannot upload files under Firefox, TypeError: access to strict mode caller function is censored is thrown. This is caused by the 'use strict' that jQuery 3 begins with. Fixed in R2 2018 SP1.

RadListBox

Server events are not raised under Firefox (selection, reorder, transfer, drag-and-drop, etc.), TypeError: access to strict mode caller function is censored is thrown. This is caused by the 'use strict' that jQuery 3 begins with. Fixed in R2 2018 SP1.

RadSearchBox

Cannot fire OnSearch under Firefox, TypeError: access to strict mode caller function is censored is thrown. This is caused by the 'use strict' that jQuery 3 begins with. Fixed in R2 2018 SP1.

RadWizard

Cannot change step with a postback under Firefox , TypeError: access to strict mode caller function is censored is thrown. This is caused by the 'use strict' that jQuery 3 begins with. Fixed in R2 2018 SP1.

Other known issues in this release

TypeScript Definitions

The .ts definitions file is wrong in the initial release and does not contain the actual definitions. You can find the file at the bottom of this post. Fixed in R2 2018 SP1.

answered on 11 Sep 2018, 12:35 PM

R3 2018 (Version number: 2018.3.910)

RadHtmlChart

The Step and Skip properties were removed from series labels because they only apply to axis labels and they are confusing when in the series labels. This means that the following will fail to compile:

<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1">

    <PlotArea>

        <Series>

            <telerik:AreaSeries>

                <LabelsAppearance Skip="1" Step="2"></LabelsAppearance>

            </telerik:AreaSeries>

        </Series>

    </PlotArea>

</telerik:RadHtmlChart>
Improvements were made on the escaping of symbols and you should review the following two articles. If you have not followed the guidance in them, special symbols in field names or improperly escaped new line symbols may cause a change in the behavior you have:
- RadHtmlChart Cannot be Bound to a Data Source that Has Special Characters in Its Field Names
- Multiline Labels (see the end of the article)

RadMap

Custom marker class is changed from .k-marker-<marker.shape> to .k-i-marker-<marker.shape>

answered on 08 Jan 2019, 11:37 AM

R1 2019 (Version number: 2019.1.115)

Common

Backported jQuery XSS issue security fix. The version remains the same - 1.12.4. This change means that XHR requests for scripts through the $telerik.$.ajax() will no longer execute those scripts unless dataType: "script" is set in the options, which is the security fix that jQuery implemented and is correct behavior. This is necessary because this issue was reported as fixed in 1.12.0 and so we upgraded to the latest (1.12.4) to get this fix. It turns out, however, that the jQuery team silently reverted it in 1.12.3 without posting in the 1.12.3 release notes. To minimize changes, we used their guidance to backport the fix. Important: static security scans will still report the jQuery brought by Telerik UI for ASP.NET AJAX as being vulnerable, and this is going to be a false positive as of R1 2019. The jQuery version brought by Telerik UI for ASP.NET AJAX cannot be upgraded to 3.x, because this breaks the MS AJAX framework (we attempted this in R2 2018).

RadAsyncUpload

When uploading a large file and the ChunkSize property is set the excel files are partially uploaded - the problem was fixed in the LIB (nightly build) 2019.1.308 and will not exist in R2 2019.

You can download the LIB from https://www.telerik.com/account/product-download?product=RCAJAX -> click on the Internal Builds tab -> download Telerik_UI_for_ASP.NET_AJAX_2019_1_308_Dev_hotfix.zip or Telerik_UI_for_ASP.NET_AJAX_2019_1_308_Trial_hotfix.zip depending on your license.

***Update*** The issues below are fixed in R1 2019 SP1 (version 2019.1.215)

RadGrid

Exporting to Xlsx or Biff throws an Exception: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index. This happens when the last column in the columns collection has either the Visible, Display or Exportable property set to false. The Issue is logged at After upgrading to 2019.1.115 Export to XLSX throws an exception: Index was out of range with critical priority.
HeaderContextMenu goes out of screen boundaries. See the ContextMenu section below for more information.

ContextMenu

Menu goes out of screen boundaries after the opening animation finished. The first time the issue was observed is when it is used inside RadGrid as HeaderContextMenu, but the same applies for standalone ContextMenu control. Bug was logged in the Feedback Portal at as RadGrid HeaderContextMenu out of screen boundary but the workaround posted in it actually applies for the ContextMenu.

RadEditor

When the ToolProviderID property is set, the page errors out with "R.get_canAcceptTrackChange is not a function" - the problem will be fixed in the upcoming R1 2019 SP1 due in February. You can find a workaround in the following feedback portal bug item: R.get_canAcceptTrackChange is not a function error when using ToolProviderID.

answered on 15 Jan 2020, 02:07 PM

R1 2020 (Version number: 2020.1.114)

RadAsyncUpload

AllowedCustomMetaDataTypes=Telerik.Web.UI.AsyncUploadConfiguration is enabled by default to improve the application security and allows the built-in Telerik type only. You can find more information here.

RadHtmlChart

The RadHtmlChart appearance properties are not fully applied in R1 2020 (e.g. XAxis.MajorGridlines="false", ChartTitle.Appearance.TextStyle.Font, etc.). You can find more details here.

The problem is scheduled for R1 2020 SP1

RadFileExplorer

Value property is not supported by RadToolBarDropDown error in R1 2020 when adding a dropdown to FileExplorer toolbar. Feedback portal item here.

Scheduled for R2 2020 SP1

Visual Studio Extensions for Telerik® UI for ASP.NET AJAX (VSX)

[Update] The problem is fixed in version 2020.1.122 of Visual Studio Extensions for Telerik® UI for ASP.NET AJAX which you can obtain from the VS marketplace:

[/Update]

If your app is configured to use the Classic RenderMode of the Telerik AJAX components, you may experience appearance problems (like displacements, different metrics, fonts, and colors) after upgrading to R1 2020 due to that the Telerik VSX extensions for ASP.NET AJAX tool puts

<add key="Telerik.Web.UI.RenderMode" value="lightweight" />

in the appSettings section of the web.config file. This setting forces the Telerik AJAX components to use their Lightweight render mode (the Default rendering is the Classic).

To solve the issue remove the <add key="Telerik.Web.UI.RenderMode" value="lightweight" /> line from the web.config or upgrade to the latest version of the Telerik AJAX VSX extension. You will also not experience the issue if you perform a Manual Upgrade.

answered on 23 Oct 2020, 11:04 AM

R3 2020 SP1 (Version number: 2020.3.1021)

RadClientExportManager:

Export to PDF throws JS error when no jQuery is loaded in window.$. There are two workarounds for it

set jQuery globally with a script:
```
window.$ = window.$ || $telerik.$;
```

Include a script reference to the Telerik.Web.UI.Common.jQueryInclude.js: https://docs.telerik.com/devtools/aspnet-ajax/general-information/using-jquery/using-jquery#using-the-jquery-brought-by-telerik

  <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
            <Scripts>
                <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js" />
                <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js" />
                <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js" />
            </Scripts>
        </telerik:RadScriptManager>

Regards,
Peter Milchev
Progress Telerik

Virtual Classroom, the free self-paced technical training that gets you up to speed with Telerik and Kendo UI products quickly just got a fresh new look + new and improved content including a brand new Blazor course! Check it out at https://learn.telerik.com/.

answered on 11 Feb 2025, 03:43 PM | edited on 07 May 2025, 08:29 AM

2025 Q1 (Version number: 2025.1.218)

Common:

Changed: Starting with 2025 Q1, all users of the Telerik and Kendo UI components and tools, will need to apply a valid license key file to both new and existing projects. For details, see our Licensing Documentation.
VSX wizard and extensions: AJAX Visual Studio extensions don't add Telerik references when creating or upgrading projects.

Editor

Regression: Extra Spaces in Bullets When Pasting from Word.

Grid

Regression: Uncaught TypeError: t is not a function in Telerik RadGrid 2025 Q1

Window

Regression: RadWindow throws Uncaught TypeError: Cannot read properties of undefined (reading 'parentElement') - happens when RenderMode is set to Classic and the NavigateUrl is set.

answered on 20 May 2025, 02:17 PM | edited on 29 May 2025, 06:53 AM

2025 Q2 (Version number: 2025.2.520)

Common:

Unified distribution for trial and commercial packages: Streamlined user experience by consolidating trial and commercial packages into a single unified distribution for Telerik UI libraries. Access is now managed through a license key file, eliminating the need for separate trial downloads. For more information, please refer to the Licensing Documentation.

Inputs:

Uncaught TypeError: Cannot read properties of null (reading 'className')

Grid:

System.NullReferenceException: Object reference not set to an instance of an object at Telerik.Web.UI.Licensing