Questions on UI for Blazor Forum

1 answer

96 views

I'm having trouble with data binding in the drawer component. In order to help isolate + demonstrate the issue I've created a simple test page containing a drawer component with minimal configuration:-

@layout TelerikLayout
@page "/test"

<TelerikDrawer @bind-SelectedItem="SelectedItem"
               Data="Data">
    <DrawerContent><p>Hello</p></DrawerContent>
</TelerikDrawer>

@code {
    private class DrawerItem
    {
        public FontIcon Icon { get; set; }
        public bool Separator { get; set; }
        public string Text { get; set; }
        public string Url { get; set; }
    }

    private List<DrawerItem> Data { get; set; } = new List<DrawerItem> { new DrawerItem { Icon = FontIcon.CaretTr, Text = "Hello" } };

    private DrawerItem? SelectedItem { get; set; }
}

And here is the resulting markup. The drawer component is rendered and so is the drawer content, but no drawer items:-

<div class="k-drawer-container k-drawer-overlay"><!--!-->
<!--!-->
    <div class="k-drawer telerik-blazor k-drawer-start" data-id="2ccfd37c-d109-485f-80e7-654bf55cb5c7" dir="ltr"><!--!-->

        <!--!--><!--!-->

        <div class="k-drawer-wrapper" style="width: 0; transition-duration: 0ms;"><!--!-->
        </div><!--!-->
    </div><!--!-->
    <div class="k-drawer-content"><!--!-->
<!--!--><p>Hello</p>    </div><!--!-->
</div>

I've tried using IEnumerable instead of List, making SelectedItem not nullable, and removing SelectedItem altogether, and the result is the same. I'm on Telerik UI for Blazor version 8.1.1 and all other components appear to be working fine. Any help would be appreciated.

Drawer

updated answer on 30 Apr 2025

0 answers

52 views

Display scrollbar _only_ for scrollable columns

I have a grid with first three columns frozen and other columns are horizontally scrollable. Somewhat similar to this example Blazor Grid Columns Frozen (Locked) - Telerik UI for Blazor

Is it possible to display the horizontal scrollbar only for the scrollable columns (and do not display for the frozen columns).

Grid

asked on 28 Apr 2025

1 answer

81 views

use Popover in Telerik Map for Blazor

Hi

Please guide me how can I use Popover in the Map instead of showing Tooltip?

Map

updated answer on 27 Apr 2025

1 answer

52 views

spreadsheet component download tool exports xlsx.zip

The xlsx.zip contains some strange files, but why is there no normal .xlsx file..

In the past it did produce a normal .xlsx file in the download tool of the spreasheet.

Is there a setting/option for this?

Spreadsheet

answered on 27 Apr 2025

1 answer

68 views

"Select all" on grouped grid with manual operations

Hi,

I use grouping on a grid with manual operations and want to select all items in the grid. This works for the ungrouped data. But once the data are grouped the checkbox for selecting all items behaves strange.

Is there a way around that?

A sample can be found here: https://blazorrepl.telerik.com/mJYeQIas44WKo5F346

Best regards,

Rayko

Grid

updated answer on 24 Apr 2025

1 answer

50 views

Customise ContextMenu size

By default, the `ContextMenu` opens a `List` of medium size. Can you add a way to customise it?

ContextMenu

answered on 23 Apr 2025

1 answer

88 views

Run function on mouse hover

Hi,

Is there a way to trigger a method and pass data to it when hovering over a line in a line chart?

Regards,

Omar

Charts

answered on 23 Apr 2025

1 answer

91 views

iOS error with TelerikColorPicker

I'm using the TelerikColorPicker in my Maui Blazor hybrid code like this:

<TelerikColorPicker @bind-Value="@_color"
                    View="@Telerik.Blazor.ColorPickerView.Palette"
                    AdaptiveMode="@Telerik.Blazor.AdaptiveMode.Auto"/>
...
@code { private string? _color; }

This works fine in Windows. However, it throws an error in iOS:

null is not an object (evaluating 'this.element.addEventListener')
bindEvents@app://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:1063454
@app://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:1063348
initPopupNavigationService@app://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:1054798
s@app://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:1054360
@app://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:23:2177305
@app://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:695018
@app://0.0.0.1/_framework/blazor.webview.js:1:2891
Promise@[native code]
beginInvokeJSFromDotNet@app://0.0.0.1/_framework/blazor.webview.js:1:2859
@app://0.0.0.1/_framework/blazor.webview.js:1:47081
@user-script:1:4:75
forEach@[native code]
@user-script:1:4:45

And also in Android:

[INFO:CONSOLE(1)] "Cannot read properties of null (reading 'addEventListener')
TypeError: Cannot read properties of null (reading 'addEventListener')
at e.NavigationService.bindEvents (https://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:1063455)
at new e.NavigationService (https://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:1063338)
at s.initPopupNavigationService (https://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:1054775)
at new s (https://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:1054334)
at e.initComponent (https://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:23:2177300)
at e.initColorPicker (https://0.0.0.1/_content/Telerik.UI.for.Blazor/js/telerik-blazor.js:1:695018)
at https://0.0.0.1/_framework/blazor.webview.js:1:2891
at new Promise (<anonymous>)
at y.beginInvokeJSFromDotNet (https://0.0.0.1/_framework/blazor.webview.js:1:2848)
at External.__callback (https://0.0.0.1/_framework/blazor.webview.js:1:47076)
at Microsoft.JSInterop.JSRuntime.<InvokeAsync>d__16`1[[System.Object, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
at Telerik.Blazor.Components.TelerikColorPicker.InitColorPicker()
at Telerik.Blazor.Components.TelerikColorPicker.OnAfterRenderAsync(Boolean firstRender)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle, ComponentState owningComponentState)", source: https://0.0.0.1/_framework/blazor.webview.js (1)

The error is coming from

async Task TelerikColorPicker.InitColorPicker()

Has anyone seen anything like this?

Thanks

Andrew

ColorPicker

answered on 22 Apr 2025

1 answer

54 views

Is there a way when I focus on TelerikDatePicker field the numeric keypad is automatically displayed

I am working on a mobile app using Blazor Hybrid, I have a TelerikDatePicker field on a page.
Is there a practical way when I focus on that field it automatically shows the numeric keyboard instead of alphanumeric keyboard ? like when using TelerikNumericTextBox.

Thank you.

DatePicker

updated answer on 22 Apr 2025

2 answers

44 views

In TelerikGrid, how to select a cell when the column header is clicked?

I have a TelerikGrid with SelectionMode=Single, so when I click on cell, it becomes selected. Then I click on a header of another column; the header cell gets the focus (and becomes highlighted), but the selected cell does not change. To the user, it looks like there are two selected columns now.

Is there a practical way to select the cell at the current row and the focused column when the user clicks on a column header? Maybe detect when a column header gets the focus (without going through JSInterop)?

If that is diffucult - can I prevent header cells from getting the focus but keep the ability to resize columns? I can change the header styles to make its focus invisible, but that would be a short-term workaround only.

I use Telerik in a Blazor Maui Hybrid application.

Thank you.

Grid

answered on 22 Apr 2025