Last Updated: 18 Jul 2024 06:31 by Johannes
Created by: Michal
Comments: 6
Category: UI for Blazor
Type: Bug Report


starting with version 6.0, dialogs used together with loading indicator are at wrong z-index order.

- None of hotfixes with "delay" helped.

- users are stucked and cant confirm anything

How to replicate

Click on "Show Confirm with loading indicator". Loading animation should be at BACK of confirm dialog(as at older versions, prior 6.0)


Last Updated: 15 Jul 2024 13:39 by René
The parameter is available for TelerikNumericTextBox only but it would be helpful for text-inputs as well.
Need More Info
Last Updated: 15 Jul 2024 12:46 by ADMIN

<TelerikNumericTextBox @bind-Value="myValue" Format="C" SelectOnFocus="true">
the content of the input is not selected upon focussing.  Without the Format="C" it is.

Last Updated: 12 Jul 2024 08:52 by ADMIN

I just spent hours trying to understand why my grid did not work and threw a "source can't be null" exception at me when I set data to a 100% initialized - not null - list of a struct type.. Eventually I figured that the struct was the problem and turning it into a class fixed it, but that was just by chance.

Please for the sake of developer sanity give this a proper check.

Last Updated: 05 Jul 2024 07:44 by ADMIN
Created by: Scott
Comments: 1
Category: UI for Blazor
Type: Feature Request

We would like to see all the Blazor controls support the ability to show the time in the browser's local time as a feature that can be enabled.  It should support converted from both UTC and server time.

A question on how to do this has been asked at least twice on the forums:

Some examples of how other's have implemented this as a control can be founde here:


Last Updated: 02 Jul 2024 13:45 by Al
Created by: Al
Comments: 2
Category: UI for Blazor
Type: Feature Request
Request the TelerikNotification supports MarkupString or HTML or at least Multiline text
Last Updated: 28 Jun 2024 05:30 by ADMIN
Release 2024 Q3 (Aug)
Created by: Eugenie
Comments: 5
Category: UI for Blazor
Type: Feature Request

I would like the DropDownList to automatically detect the boundaries of the screen in order not to truncate items when the popup is opened.





The request is also valid for the rest of the popups including AutoComplete, ComboBox, Context Menu, MultiSelect.

This is also valid for the Window.

Need More Info
Last Updated: 27 Jun 2024 18:48 by Mauro
Created by: Hien
Comments: 12
Category: UI for Blazor
Type: Feature Request

I would like to be able to set the Id on any Blazor component for automated testing purposes.



If you need something different than automated testing selectors, please add your use case in the comments.

For automated testing, you can cascade selectors through a parent element (e.g., a div or span) that has the desired attributes (be that id, class, some data-* attribute, etc.). Adding ID parameters to Blazor components can easily make them brittle because they can be repeated and included in arbitrary hierarchy easily - that's the core concept of a razor component - so such IDs need to be unique, which defeats the predictability you will need for testing.

If you are interested in testing with Selenium, you may find useful this request: If so, Vote for it and Follow it so we can know there is interest, and so you can get status updates.

You can also Follow a separate enhancement for the Grid Command buttons here :


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: 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: 31 May 2024 23:00 by Jonathan

I would like to have a boolean flag like ExpandDropdownOnFocus which when set to true and the component is focused the dropdown will be expanded.

ADMIN EDIT: When voting, please add your comment on how you would like this to be implemented. At the moment, there are two ideas:

  • A parameter that, when set to true, will make the dropdowns shop up when the component receives focus - less code, but solves only one specific scenario
  • An OnFocus event plus an instance method that opens the dropdown - a little more code (handle an event, populate a reference, call its method) which will provide more functionality and flexibility as the event will let you know that focus happened and you can add more logic (calculations, change CSS classes,...)
Last Updated: 27 May 2024 19:37 by George

See below repl

The first dropdown is populated correctly, it is not in a FormItem or Template

The second one, populated in the same way but inside a FormItem context does not show the data, it only redraws and shows data when entering another control i.e. the other working dropdown.

This was previously working when the application was using .net 6 and Telerik 3.6.1
It has since been updated to .net 8 and Telerik 5.1.1

What is the correct way to populate this?
Can you provide more information?


Last Updated: 27 May 2024 11:36 by ADMIN
Created by: Christian
Comments: 0
Category: UI for Blazor
Type: Feature Request

Please consider adding to Blazor UI a drop-down treeview component with:

  • multiple selections via checkboxes
  • expand/collapse
  • lazy loading on expand
  • tag mode


Blazor Dropdown Tree with checkboxes.

Thank you

Last Updated: 24 May 2024 14:31 by ADMIN


On the NumericTextBox example here

If you put the NumericTextBox in edit mode and hold the up or down key on the keyboard, the value auto increments/decrements.

1/ Can you please replicate this when the mouse is held down when clicking the up down spinner buttons? Users don't want to always use keyboard for this function.

2/ Can you add an acceleration property, eg when mouse/key is held down it increments at rate n1 for first few seconds, then after time s1 it will increment at rate n2 for remaining time mouse/key held?

Last Updated: 23 May 2024 13:46 by ADMIN
Created by: Maria
Comments: 4
Category: UI for Blazor
Type: Feature Request

I would like a comopnent similar to this one

The goal is to be able to show and select hierarchical data, because the multiselect is flat

Last Updated: 22 May 2024 12:58 by ADMIN
Created by: Tung
Comments: 1
Category: UI for Blazor
Type: Bug Report



Here is my demo DatePicker Demo

In Firefox, after I use the mouse to black all texts out, then DatePicker only selects the month field in the place holder. I expect to select all texts.

In Chrome or Edge, the DatePicker works as expected, after blacking texts out, it selects all texts in the place holder

Could you please check the issue?


Thanks and regards,


Last Updated: 22 May 2024 08:34 by ADMIN
Created by: NovaStor
Comments: 3
Category: UI for Blazor
Type: Feature Request



I'd like to request the ability to use a TimeSpanPicker component in Blazor.


For example, see


Thank you.

Last Updated: 21 May 2024 14:15 by ADMIN

When filtering or editing a Grid with enum data, the Name property of their Display parameter is respected.

However, in the initial view mode of the Grid the Name property is not applied and the enum values are rendered regardless of whether or not their Display parameter has a Name property defined.





In the meantime, a workaround you might try is to create a custom method to check whether Display attribute is defined and get and display its Name property, otherwise display the Enum's member name.

You can then use a Template for the column that uses enum data, cast its context to the model you are using and invoke the method on the field containing the enum. The sample below demonstrates how you can achieve this.

@using System.ComponentModel.DataAnnotations
@using System.Reflection

<TelerikGrid Data=@MyData EditMode="@GridEditMode.Inline" Pageable="true" Height="500px"
             OnUpdate="@UpdateHandler" FilterMode="@GridFilterMode.FilterRow">
        <GridColumn Field=@nameof(SampleData.ID) Editable="false" Title="ID" />
        <GridColumn Field=@nameof(SampleData.Name) Title="Name" />
        <GridColumn Field=@nameof(SampleData.Role) Title="Position">       
                    var currentEmployee = context as SampleData;
                    var currentRole = GetDisplayName(currentEmployee.Role);                        

            <GridCommandButton Command="Save" Icon="save" ShowInEdit="true">Update</GridCommandButton>
            <GridCommandButton Command="Edit" Icon="edit">Edit</GridCommandButton>

@code {
    //custom method to check whether Display attribute is defined and get and display its Name property, otherwise display the Enum's member name
    public string GetDisplayName(Enum val)
        return val.GetType()
                  ?? val.ToString();

    public void UpdateHandler(GridCommandEventArgs args)
        SampleData item = (SampleData)args.Item;

        //update the view-model
        var index = MyData.FindIndex(i => i.ID == item.ID);
        if (index != -1)
            MyData[index] = item;

        //perform actual data source operations here

    //model and dummy data generation
    public class SampleData
        public int ID { get; set; }
        public string Name { get; set; }
        public Role Role { get; set; }

    public enum Role
        [Display(Name = "Manager")]
        [Display(Name = "Employee")]
        [Display(Name = "Contractor")]

    public List<SampleData> MyData { get; set; }

    protected override void OnInitialized()
        MyData = new List<SampleData>();

        for (int i = 0; i < 50; i++)
            MyData.Add(new SampleData()
                ID = i,
                Name = "name " + i,
                Role = (Role)(i % 3) // just some sample to populate initial values for the enum

Last Updated: 15 May 2024 12:09 by ADMIN

Currently using Telerik.DataSource.QueryableExtensions.CreateDataSourceResult() results in queryable.Count() + queryable.Skip(...).Take(...). done seperatelly. EF Core specific tests are already present it seems, based on decompiled code, I can see: "if (!sort.Any() && queryable.Provider.IsEntityFrameworkProvider())". 

Request: Add support for other ORM's that are more capable than EF Core. In case of pagination, window-function could be used to save from extra count query. A short sample bellow:

var dbResults = await queryable
	.Select(x => new {
		Item = x,
		TotalCount = Sql.Ext.Count().Over().ToValue()
	.Skip(() => offset)
	.Take(() => limit)

var count = dbResults.FirstOrDefault()?.TotalCount ?? 0;
var items = dbResults.Select(x => x.Item);

Read more about Window functions: 

Last Updated: 15 May 2024 08:33 by Ben
The IsEntityFrameworkProvider method in the DataSource package returns false when the provider is Entity Framework Core. 
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