Last Updated: 01 Mar 2024 12:46 by ADMIN

I've made a simple blazor repl demo here:

As you can see, TotalCount is 10, and the current PageSize is also 10. When these values match, the value in the "items per page" dropdown isn't present. Select any other value, and it will be present (for 5, 20, 40). Come back to 10, and again, the value disappears.

Last Updated: 01 Mar 2024 08:15 by ADMIN
Release 2024 Q2 (May)

When you try to use Wizard with only one step inside, the following error appears:

"ArgumentException: The "Max" value should be greater than 0."

If you have more than one step, everything works as expected.


----------ADMIN EDIT-----------

To avoid the exception, you can use at least two steps inside the Wizard.

Last Updated: 29 Feb 2024 11:58 by ADMIN
Scheduled for 2024 Q2 (May)

I have set a small size to the MultiSelect. I noticed that the Summary Tag that contains the "1 more selected" text does not change - its size always remains the same regardless of the component size.


The Roundness setting of the MultiSelect also does not affect the summary tag.


Last Updated: 28 Feb 2024 14:31 by ADMIN

Some users report that the hour selector of the datetime picker is not visible. For some people it starts to show if you move the scroll wheel. For some that does not help. This does not happen for all users and can be tricky to replicate. I can replicate it on certain zoom levels and resolutions.

I can replicate this on the demo site. Screenshot added. 

I can also make it work again by removing "translateY(93px)". Screenshot added.

Last Updated: 28 Feb 2024 12:24 by ADMIN
Release 2024 Q2 (May)
The Now button is hard-coded in uppercase. I cannot change it even with Localization. I want to be able to provide different casing for the text in the button. 
Last Updated: 28 Feb 2024 09:18 by ADMIN
Scheduled for 2024 Q2 (May)
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.


Pending Review
Last Updated: 27 Feb 2024 18:57 by Ross
We have edit dialogs with editable fields on them, and we want to display a confirmation dialog if the user tries to close the edit dialog without saving. Simplified code to illustrate the issue:
Last Updated: 27 Feb 2024 11:45 by ADMIN
Scheduled for 2024 Q2 (15.05.2024)
When only all.css stylesheet is referenced in the masterpage:
  • the wizard doesn't detect the masterpage at all because it searches for swatches theme reference
  • if the user leaves commented swatches theme reference the wizard will modify the all.css reference incorrectly
Pending Review
Last Updated: 26 Feb 2024 16:12 by Harmen

I have a TelerikGrid with Reordarable enabled inside of a TelerikWindow. Reordering of the column works fine only the drop clue is not showing. I think this is because the z-index is incorrect.

Missing drop clue:


z-index of drop clue is 10000:


z-index of window is 10002:

Last Updated: 24 Feb 2024 08:25 by ADMIN
Scheduled for 2024 Q2 (May)

The Editor is not showing its Value in the following scenario:

  • Using JSInterop in OnAfterRenderAsync
  • Setting the Editor Value in OnAfterRenderAsync and after the JSInterop call
  • Blazor Server app (seems to work in WebAssembly)

Possible workarounds are:

  • Set the Editor Value and call StateHasChanged() before using JSInterop in OnAfterRenderAsync, or
  • Add some small delay (for example, await Task.Delay(100); ) before using JSInterop.
Last Updated: 23 Feb 2024 10:59 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: 23 Feb 2024 10:42 by ADMIN
Release 4.3.0 (06/07/2023) (R2 2023)

Triggering Edit in a Grid bound to a DataTable or ExpandoObject and with edit mode set to Popup throws an unhandled exception. This started to occur in 4.1.0 - the same code runs fine on 4.0.1

To reproduce:

  1. run (note this is the DataTable demo, but with changed edit mode)
  2. trigger edit mode
  3. observe the unhandled exception
In Development
Last Updated: 23 Feb 2024 10:29 by ADMIN



Attached to this post are a reproducible and a workaround - setting the state in OnAfterRenderAsync with a small delay, so the initial grid render happens, then it can re-render and take the filters into account.


Last Updated: 22 Feb 2024 13:31 by ADMIN
Release 2024 Q2 (May)
Created by: David
Comments: 0
Category: Grid
Type: Bug Report

When the Grid is databound via OnRead event, the initially displayed aggregates are wrong and take into account the first page only.

A possible workaround is to bind the Grid in OnAfterRenderAsync -

@using Telerik.DataSource
@using Telerik.DataSource.Extensions

<TelerikGrid @ref="@GridRef"
        <GridAggregate Field="@nameof(Product.Name)" Aggregate="@GridAggregateType.Count" FieldType="@(typeof(System.String))" />
        <GridColumn Field="@nameof(Product.Name)" Title="Product Name">
        <GridColumn Field="@nameof(Product.Price)" />
        <GridColumn Field="@nameof(Product.ReleaseDate)" Title="Release Date" />
        <GridColumn Field="@nameof(Product.Active)" />

@code {
    TelerikGrid<Product> GridRef { get; set; }
    List<Product> GridData { get; set; }

    bool ShouldBindGrid { get; set; }

    async Task OnGridRead(GridReadEventArgs args)
        if (!ShouldBindGrid)

        await Task.Delay(200); // simulate network delay

        DataSourceResult result = GridData.ToDataSourceResult(args.Request);

        args.Data = result.Data;
        args.Total = result.Total;
        args.AggregateResults = result.AggregateResults;

    protected override async Task OnAfterRenderAsync(bool firstRender)
        if (firstRender)
            // workaround for initial Grid aggregates
            ShouldBindGrid = true;

    protected override void OnInitialized()
        GridData = new List<Product>();
        var rnd = new Random();

        for (int i = 1; i <= 50; i++)
            GridData.Add(new Product()
                Id = i,
                Name = "Product " + i.ToString(),
                Price = (decimal)rnd.Next(1, 100),
                ReleaseDate = DateTime.Now.AddDays(-rnd.Next(60, 1000)),
                Active = i % 3 == 0

    public class Product
        public int Id { get; set; }
        public string Name { get; set; }
        public decimal Price { get; set; }
        public DateTime ReleaseDate { get; set; }
        public bool Active { get; set; }

Last Updated: 22 Feb 2024 10:47 by ADMIN
Scheduled for 2024 Q2 (May)
Created by: Srdjan
Comments: 9
Category: PDFViewer
Type: Bug Report
If you compare the print quality against the Kendo UI jQuery PDF viewer, the quality difference is night and day. We did not investigate what is happening under the hood in both components. However, the same printing dialog appears when printing via both components and both of them are web components, which indicates to us, that this issue is not related to the browser.
Last Updated: 22 Feb 2024 06:57 by Michal

When Adaptive = true, changing the collection of buttons seems to "break" the adaptive calculation. The Toolbar fails to determine what are the buttons to show in the main element and what are the buttons to show in the pop-up:



For the time being, a possible workaround is to force the component to refresh when you change the buttons. For that purpose, you can dispose it and re-initialize it after some delay. Here is a runnable sample:

In Development
Last Updated: 21 Feb 2024 09:07 by ADMIN
Created by: Ben
Comments: 0
Category: Map
Type: Bug Report

If I set a global font icon type, the Map icons are broken, because they are missing the k-font-icon CSS class. A possible workaround is to apply the missing styles to the rendered k-icon class:

In the meantime, one can use SVG icons or the following CSS rule as a workaround:

    .k-map .k-icon {
        width: 1em;
        height: 1em;
        outline: 0;
        font-size: 16px;
        font-family: "WebComponentsIcons";
        font-style: normal;
        font-variant: normal;
        font-weight: normal;
        line-height: 1;
        speak: none;
        text-transform: none;
        text-decoration: none;
        flex-shrink: 0;
        display: inline-flex;
        flex-flow: row nowrap;
        align-items: center;
        justify-content: center;
        vertical-align: middle;
        position: relative;
        -moz-osx-font-smoothing: grayscale;
        -webkit-font-smoothing: antialiased;
Last Updated: 20 Feb 2024 13:01 by ADMIN
Release 4.2.0 (04/26/2023)

When I change the field from the dropdown to another field of the same type, the filter editor is not updated.

The issue occurs when I'm using Enum fields - the dropdown editor is not updated to display the correct values of the newly selected Enum field.


Steps to reproduce:

  1. Select NumberField
  2. The dropdown editor still shows the Color values


Last Updated: 20 Feb 2024 06:51 by ADMIN

In this example.  Select a cell in column C.  Then double click on another cell in column C.  The unhandled exception will show up and a null reference exception is logged in the console.

The exception message is:

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.

Last Updated: 19 Feb 2024 14:43 by ADMIN
Scheduled for 2024 Q2 (May)


A Date/Time Picker is bound to a nullable DateTime value. If the user clears the value with the keyboard, the component will show as invalid (with red border). Instead, the picker should treat null values as valid.

Here is a test page with a few different workarounds:

<TelerikButton OnClick="@( () => DateValue = null )">Clear Value</TelerikButton>
<TelerikButton OnClick="@( () => DateValue = DateTime.Now )">Set Value</TelerikButton>

DateValue.HasValue: @DateValue.HasValue

<p>Default behavior:</p>

<TelerikDatePicker @bind-Value="@DateValue"
                   Width="200px" />

<p>Red border will disappear after blur (CSS):</p>

<TelerikDatePicker @bind-Value="@DateValue"
                   Class="@( !DateValue.HasValue ? "valid-null" : "" )" />

<p>Red border will never appear (CSS):</p>

<TelerikDatePicker @bind-Value="@DateValue"
                   Class="valid-null" />

<p>Red border will disappear after blur (OnChange):</p>

<TelerikDatePicker @bind-Value="@DateValue"
                   OnChange="@OnPickerChange" />

    .k-input.k-invalid.valid-null {
        border-color: rgba(0, 0, 0, 0.08);

@code {
    private DateTime? DateValue { get; set; } = DateTime.Now;

    private async Task OnPickerChange(object newValue)
        DateTime? newDate = (DateTime?)newValue;

        if (!newDate.HasValue)
            DateValue = DateTime.Now;
            await Task.Delay(1);
            DateValue = null;

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