Last Updated: 12 Jun 2024 13:49 by ADMIN
Release 2024 Q3 (Aug)

I have a Grid using checkbox selection and when I un-check a row, the SelectedItemsChanged event is not firing. I'm using an async handler.

The problem appears to happen when a row is selected and then un-selected. The event is firing when it is selected but is not firing when it is un-selected.

<TelerikGrid Data="strategicLevelItems" SelectedItems="selectedStrategic" Width="100%" Height="500px"
                                 ScrollMode="GridScrollMode.Scrollable" SelectionMode="GridSelectionMode.Multiple"
                                 SelectedItemsChanged="@((IEnumerable<GetNavigationNodesModel> strategicItems) => OnStrategicSelectAsync(strategicItems))"
                            <GridCheckboxColumn SelectAll="true" Width="40px" OnCellRender="@GridHelpers.CenterAlign" />
                            <GridColumn Field="@(nameof(GetNavigationNodesModel.Name))" />

    private async Task OnStrategicSelectAsync(IEnumerable<GetNavigationNodesModel> selectedItems)
        selectedStrategic = selectedItems;

        var state = tacticalGrid.GetState();

        var compositeFilter = new CompositeFilterDescriptor() { LogicalOperator = FilterCompositionLogicalOperator.Or };
        foreach (var item in selectedItems)
            compositeFilter.FilterDescriptors.Add(new FilterDescriptor()
                Member = "ParentId",
                Operator = FilterOperator.IsEqualTo,
                Value = item.Id


        await tacticalGrid.SetState(state);

Last Updated: 12 Jun 2024 11:35 by ADMIN
Created by: Juan Angel
Comments: 2
Category: Charts
Type: Feature Request

This functionality would be very useful for data analysis.

Moving the cursors within the chart itself, allows to define a range within the series, being able to offer useful data.



Cursors - Multisim Live            Cursors - Multisim Live

Last Updated: 12 Jun 2024 11:29 by ADMIN
Release 2.18.0

Please add an attribute to Blazor GridColumn which allows to easily format data with the default .NET standard formats

e.g. <GridColumn Field="@(nameof(Item.Price))" Title="Price" Format="0#.##" />

It's a little bit annoying always having to define a template for this purpose.


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Last Updated: 12 Jun 2024 10:51 by ADMIN
Release 2024 Q3 (Aug)

Reproduceable example:

Steps to reproduce:

  • Add a TelerikGrid to the page - most properties on the grid do not matter for this issue
  • Implement the OnStateInit event
  • Define the GridAggregates render fragment within the TelerikGrid, but leave it empty - do not put any components inside it
  • When the page initializes, note that OnStateInit is never fired

If you remove the GridAggregates emtpy render fragment, or put at least one GridAggregate component in it, OnStateInit fires like expected.

In my project, I've created a component that wraps around the TelerikGrid that I use on all my pages, so that I can have many properties and functions set to reasonable defaults for my use case. My component has an option to conditionally include GridAggregate components within the inner TelerikGrid's GridAggregates render fragment based on separate configuration. If no separate configuration is provided, no GridAggregate components are included, and the GridAggregates render fragment is left blank. Since my component is built in razor markup, there isn't a great option for nulling out that render fragment if it's empty. I had no problems with this exact same code in UI for Blazor version 5.1, and I hope this can be fixed.

Last Updated: 12 Jun 2024 10:47 by Nicholas
Created by: Nicholas
Comments: 0
Category: RadioGroup
Type: Bug Report
The RadioGroup's FocusAsync() method does not work. To reproduce, run this example and press the button:
Last Updated: 12 Jun 2024 10:28 by Jennifer

The Grid will cancel the insertion of a new item when:

  • the new item is not saved yet
  • the new item is expanded and its DetailTemplate is visible
  • the user changes the value of a column that has an editor template

Blazor REPL test page


In the meantime, a possible workaround is to hide the expand button for items, which are not added to the "permanent" Grid data yet. Here is how to do it with CSS:

.k-grid-add-row .k-hierarchy-cell .k-icon {
    display: none;
Last Updated: 12 Jun 2024 10:09 by Roy
Created by: Roy
Comments: 0
Category: Spreadsheet
Type: Feature Request

Please add support for protected worksheets and protected workbooks.

Last Updated: 12 Jun 2024 07:06 by ADMIN
Created by: Terrence
Comments: 1
Category: Grid
Type: Feature Request
Hi Telerik,

We would like to request for a future improvement, to be able to drag when there is already 1 entry in the Grid. As of now we are able to make a workaround for an empty Grid using the following link: Blazor Grid Row Drag and Drop - Telerik UI for Blazor

We are able to use <NoDataTemplate> and added a padding for it. However, we are unable to do a workaround if there's already 1 entry. See attached "gif".

Thank you.


Last Updated: 12 Jun 2024 06:20 by ADMIN
Created by: Jesper
Comments: 4
Category: UI for Blazor
Type: Bug Report
I am using MS Playwright to create End2End tests. It worked fine when we used MudBlazor, but after we migrated to telerik I have run into a problem with the TelerikDropDownList.

It stops working if you open it too fast. It goes into a state where no matter what you do (Rebind/changing data bound values etc.), it will not open and show items.

It can be reproduced easily by calling .Open() in OnInitializedAsync()

I have reproduced it without MS Playwright in REPL, so you can easily debug it.

If you uncomment the await Task.Delay(3000); the code will work.

Expected behavior:
It is ok that Open() does nothing while the control is initializing. It is not ok that just because you called Open() once, then you are forever stuck without being able to open it later, no matter how long you wait or what you do with the items.

I do not want to insert random Delays in my code either as I expect the TelerikDropDownList to not malfunction just because I open it too early.

I hope you can prioritize this as right now the DropDownList is not usable for us.
Last Updated: 11 Jun 2024 13:32 by Brian
Release 2024 Q3 (Aug)
According to the Rendering Changes in 6.0.0 article, "k-level-0" CSS class should be added to the "li.k-drawer-item" element. This class, however, is never added.
Last Updated: 11 Jun 2024 12:01 by ADMIN
Scheduled for 2024 Q3 (Aug)

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:

Try to input text rapidly into the input field.

Last Updated: 11 Jun 2024 10:55 by Randeep
Created by: Randeep
Comments: 0
Category: TreeView
Type: Feature Request

I want to use a separate drag-and-drop mode in the TreeView similar to how the Drag column works for the rows in the Grid component. 

The main reason I am unable to use the current drag-and-drop behavior is that I cannot use an input component as part of the TreeView node.

Last Updated: 11 Jun 2024 09:27 by ADMIN
Scheduled for 2024 Q3 (Aug)
Created by: Matthijs
Comments: 4
Category: DropDownList
Type: Bug Report

Steps to reproduce:

  1. Open the Edit in Telerik REPL link from the demo page for DropDownList - Grouping.
  2. Add Filterable="true" to TelerikDropDownList.
  3. Run.
  4. Open the dropdown.
  5. Type in for instance the last item of the list "Röd Kaviar", that belongs to the category "Seafood".

Expected: the group name should change to "Seafood".

Actual: the group name is still "Beverages".

Last Updated: 11 Jun 2024 09:16 by ADMIN

When using the grouped DropDownList and performing a search for a specific element, the DropDownList incorrectly displays the initially shown group instead of the group containing the searched element.

To reproduce the issue: 

1. Open this REPL example:
2. Open the DropDownList and type "v" in the filter input field.
Last Updated: 11 Jun 2024 08:33 by ADMIN
Scheduled for 2024 Q3 (Aug)

In a filterable Grid, if a column is not bound to a field from the model the Grid uses, it throws with:

Error: System.ArgumentNullException: Value cannot be null. (Parameter 'nullableType')


The issue is reproducible :

  • For `FilterRow` -  on initialization even if the column is not filterable.
  • For `FilterMenu` - on initialization when the column is filterable.




A possible workaround for the time being is to set the FieldType of the column:

Last Updated: 10 Jun 2024 21:22 by ADMIN
Created by: Justin
Comments: 4
Category: UI for Blazor
Type: Bug Report

When SelectOnFocus="true" is enabled on the NumericTextBox control, and a format (e.g., Format="N1") is set, the SelectOnFocus functionality does not select all text if the decimal value has no trailing digits. For instance, with the value 76, the text is not selected on focus, but with the value 76.1, the text is selected correctly.

<TelerikNumericTextBox @bind-Value="@DecimalValue" Format="N1" SelectOnFocus="true"/>

@code {
    private decimal DecimalValue = 76;


Steps to Reproduce:

  1. Add a NumericTextBox control to a Blazor Server application.
  2. Set SelectOnFocus="true".
  3. Set a format, e.g., Format="N1".
  4. Enter a value such as 76 (with no trailing digits after the decimal point).
  5. Focus on the NumericTextBox.

Expected Behavior: The entire text (in this case, 76.0) should be selected when the NumericTextBox gains focus.

Actual Behavior: The text is not selected when the NumericTextBox gains focus if the value has no trailing digits after the decimal point (e.g., 76). However, if the value includes trailing digits (e.g., 76.1), the text is selected as expected.

Last Updated: 10 Jun 2024 14:28 by ADMIN

Reproduceable example:

In my use case, I have custom components that wrap each of the telerik date controls (date picker, time picker, etc). They each expose a SelectedDate/SelectedTime/etc. bindable property. The SelectedDate is populated when the telerik control in my component (like TelerikDatePicker) fires OnChange. I use this instead of ValueChanged to avoid too many UI updates while the user selects a value in the UI, such as when typing. The OnChange event fires when the date input loses focus, but if the date input didn't have focus when the clear button is clicked, it never loses foucs and never fires OnChange. Let me know if this isn't intended to be supported and I should just be using ValueChanged instead, but to me OnChange would imply it would fire in all cases when the value can also change through ValueChanged, just less often.

Steps to reproduce (I used a TelerikDatePicker in the code above but I could reproduce this locally with date time picker and time picker - it's related to the underlying DateInput):

  • Enter a date into the date picker, either through typing or using the calendar popup
  • Cause the date picker to lose focus by clicking away
  • Click the clear button
  • Notice that the date is cleared from the UI control, but it doesn't call OnChange, so the date on the page never updates

When I discovered this locally, clicking the clear button would not clear the date visually from the date input as well as not updating the actual date variable. In the REPL, I was not able to replicate this - the date clears visually in the UI.

Last Updated: 10 Jun 2024 14:24 by Michael
Created by: Michael
Comments: 0
Category: DateInput
Type: Bug Report

The input should be focused after the user clicks the clear button.

Last Updated: 07 Jun 2024 18:57 by Jonathan
Created by: Alexander
Comments: 6
Category: ComboBox
Type: Bug Report

When the option "AllowCustom" is enabled for a TelerikComboBox and the user types something above a certain speed, typed characters are lost. Here is a GIF showing the problem on the page – I typed "123456", but end up with "1246" instead. In between the input field is showing some weird glitching.

Is there a way to have the TelerikComboBox behave normally, as it apparently did in versions prior to 4.3.0? We noticed this behavior only some time after upgrading from version 4.0.1, where everything still works properly.

Last Updated: 07 Jun 2024 15:16 by ADMIN

Steps To Reproduce

  1. Install a Telerik VS extension in Visual Studio 2019/2022 on a machine with high DPI scaling (more than 150%)
  2. Try to create a new Telerik application

Expected result:

The Create New Project wizard (or any other used Telerik wizard) is shown and usable as expected.

Actual result:

The Create New Project wizard is hidden or inaccessible and the project creation is blocked.

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