Last Updated: 29 Sep 2023 08:17 by ADMIN
Created by: Simon
Comments: 3
Category: PDFViewer
Type: Bug Report


i want to Render PDF Files with the PDF Viewer Component.

The Data of the PDF is already fetched from the API when the PDF-Viewer starts Rendering the Loading animation appears and freezes.

After a few Seconds the PDF will be Rendered.

The size of the PDF File is about 5MB.



Last Updated: 28 Sep 2023 15:55 by Gilbert

On Hierarchy grids with Inline edit mode, I noticed that if a row is currently being edited and I try to expand the row to show the child grid an exception is thrown: "Error: System.InvalidOperationException: TelerikValidationComponent requires a cascading parameter of type EditContext. You can use Telerik.Blazor.Components.TelerikValidationTooltip`1[System.String] inside a EditForm or TelerikForm".

The problem stems from a validation tool inside the Grid EditorTemplate.

Last Updated: 27 Sep 2023 11:53 by Patrick

When you click on a cell which has an Editor Template with a NumericTextBox the text inside does not always get selected/highlighted. This is observed only in Server type applications. 


1. Copy the code from this REPL into a Server side project or directly download the attached Sample Project.
3. Tab in and out of the Count column.
4. The NumericTextBox does not always select the number inside.
5. [Video Example](https://screenpal.com/watch/c0QtXtV5iMR) 


The NumericTextBox does not always select/highlight the number inside


The NumericTextBox always select/highlight the number inside
Last Updated: 26 Sep 2023 13:14 by ADMIN

If you are zooming a page containing a DateTimePicker with "AdaptiveMode" set to "AdaptiveMode.Auto", the application crashes occasionally with the error:

Microsoft.JSInterop.JSException: Cannot read properties of null (reading 'addEventListener')
TypeError: Cannot read properties of null (reading 'addEventListener')

The more adaptive DateTimePicker instances the page contains, the more likely the error is to occur.



Last Updated: 25 Sep 2023 14:27 by Constantinos Petridis

I have a ComboBox/DropDownList that gets data from a remote service, using virtualization. When the PageSize property is big enough (in my case 20), I have issues scrolling up the selection box dropdown list. I'm trying to scroll but then resets to the currently selected item making it almost impossible to scroll up. You can use your own demo examples to replicate this issue.

To reproduce the issue, try the ComboBox - Virtualization, in Telerik REPL (Demo), change the PageSize from 10 to 20. Open the dropdown and select an item. Then, open again the dropdown and scroll slowly up.

Last Updated: 22 Sep 2023 11:08 by ADMIN
Created by: Sebastian
Comments: 1
Category: Grid
Type: Bug Report
When grid is grouped by one column and LoadGroupsOnDemand is set to true clicking 2nd group before the first one is finished loading results in an exception. It can be reproduced here: Telerik REPL for Blazor - The best place to play, experiment, share & learn using Blazor. (group only by single column).
Last Updated: 20 Sep 2023 15:29 by ADMIN
When creating an appointment, the Start and End editors should display the date (and time) of the slot the user clicked on.
Last Updated: 19 Sep 2023 07:50 by Miroslav
Created by: Miroslav
Comments: 0
Category: ContextMenu
Type: Bug Report

If you open a child menu via the keyboard, you can then hover over another parent and open a second submenu. The problem can be reproduced in the live demo.




The issue targets the Menu component as well.

Last Updated: 18 Sep 2023 10:52 by ADMIN

The issue is reproducible when the `AllowCustom` parameter is set to `true`.
Typing rapidly in the input field of the MultiColumnComboBox component causes the entered text to blink. Also, some of the inserted symbols are cleared.

Reproduction (if bug)

Open this demo: https://demos.telerik.com/blazor-ui/multicolumncombobox/custom-values

Try to input text rapidly into the input field.

Last Updated: 18 Sep 2023 09:08 by Richard

When the component's Adaptive mode is set to Auto, the Date & Time buttons in the popup are not rendered. 


Here is a CSS workaround that hides the titlebar in adaptive mode so that the buttons are present:

        display: none;

<TelerikDateTimePicker @bind-Value="@SelectedTime"
                        Format="MM/dd/yyyy hh:ss"

@code {
    private DateTime? SelectedTime = DateTime.Now;


Last Updated: 14 Sep 2023 10:50 by Tim

The appointments at the start of the day seem accurate. If you scroll down, the position of the appointments does not line up with the grid line for the hour that it starts at or ends at. The issue can be observed in the live demo.


Last Updated: 14 Sep 2023 07:43 by Peili

To reproduce the problem, hover over the last value of the series. While the Tooltip enters, it causes horizontal and vertical scroll and flickers. Then, it is positioned correctly.

The issue is better observed if you increase the transition speed of the Tooltip wrapper.

Reproduction: https://blazorrepl.telerik.com/cREDloaV42j7Z19G13.




A possible workaround for the time being is to alter or stop the Tooltip animation with CSS. Here is a runnable sample demonstrating the approach: https://blazorrepl.telerik.com/QnEjvIOC04hXA6W709

Last Updated: 13 Sep 2023 12:31 by Bjørnar
Created by: Bjørnar
Comments: 0
Category: PDFViewer
Type: Bug Report

If the PdfViewer is initialized with a default document, the display performance of this document will be a lot worse, compared to PDF documents that are loaded programmatically after the component is already on the web page.


Last Updated: 13 Sep 2023 11:10 by Indra
This issue is for all date inputs when having a higher latency (physical distance between the server and the end-user) the value of the date inputs is not correct. 
Last Updated: 13 Sep 2023 06:51 by ADMIN
Scheduled for 2024 R1 - PI 1 (08.11.2023) SP1

When I tried to convert a project with Microsoft Identity Platform:

Then I hit the following error message:



Last Updated: 12 Sep 2023 12:27 by ADMIN


The reset button is not working when we use the column template with the Telerik grid. How to solve this problem? Can you please send it example for reference?

Example Link :

Working Without Column Template


Not Working With Column Template




Last Updated: 11 Sep 2023 14:58 by ADMIN

When initial grouping is set through the state, the GroupFooterTemplate does not render. One has to perform some action for refreshing the Grid in order to display the template - for example, collapsing/expanding a group.

For reference, the GroupHeaderTemplate renders correctly.

Reproduction: https://blazorrepl.telerik.com/wRaJFgFy10vagYnf05




The GroupFooterTemplate renders with a delay after the Grid. A possible workaround for the time being is to refresh the Grid after it has been initialized to ensure the GroupFooterTemplate will be displayed.

Example: https://blazorrepl.telerik.com/mxkJvAbI17SoNaE148

Last Updated: 11 Sep 2023 13:12 by ADMIN
To reproduce:

move focus to a DateInput (whole date input is in focus)

Type in 01 into the DateInput, and the caret will move to the end, but no value filled.
Last Updated: 11 Sep 2023 09:43 by ADMIN
Created by: Miroslav
Comments: 1
Category: Editor
Type: Bug Report


after selecting a block of text in your editor and perform some block operation (for instance - change font size, name, ..) the original selection is lost. Would it be possible to keep that selection please?

Very thanks.


Last Updated: 08 Sep 2023 13:52 by ADMIN
Created by: Wolf-Günter
Comments: 2
Category: FileManager
Type: Bug Report
If the FileManager is nested inside an EditForm or a TelerikForm, it will trigger exceptions. Some of the nested components in the FileManager will require a ValueExpression, as if they are related to the form's EditContext.
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