Questions on UI for Blazor Forum

2 answers

23 views

Changing Notification size isn't working?

In my _Host.cshtml

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <base href="~/" />
    <component type="typeof(ApplicationInsightsInit)" render-mode="ServerPrerendered" />
    <link href="_content/Telerik.UI.for.Blazor/css/kendo-theme-default/all.css?@telerikUiForBlazorVersion" rel="stylesheet" />
    <link href="_content/Telerik.UI.for.Blazor/css/kendo-font-icons/font-icons.css" rel="stylesheet" />
    <link href="lib/fontawesome/css/all.css" rel="stylesheet" />
    <link href="css/styles.css" rel="stylesheet">
    <link href="css/site.css" rel="stylesheet" />

In my Site.css

.TelerikNotification .k-notification-container .k-notification {
    width: 300px;
    height: 50px;
    font-size: 1.5em;
    text-align: center;
}

.wide-notification-center .k-notification {
    width: 750px;
    height: 70px;
    font-size: 1.5em;
    text-align: center;
}

Blazor Page

<TelerikNotification @ref="@NotificationRefWide" Class="wide-notification-center" HorizontalPosition="@NotificationHorizontalPosition.Center" AnimationDuration="3000"></TelerikNotification>

C# page code (server side)

public TelerikNotification NotificationRefWide { get; set; }



                    NotificationRefWide.Show(new NotificationModel()
                    {
                        Text = "Warning: " + message,
                        ThemeColor = ThemeConstants.Notification.ThemeColor.Warning,
                        Closable = true,
                        CloseAfter = duration,
                        Icon = FontIcon.WarningTriangle,
                        ShowIcon = true
                    });

Any changes I make in the Site.css have ZERO impact on the display of the notification (see attached image). In fact, I can remove the class definitions from CSS and still get the same results. It's as if Telerik Notification is completely ignoring the class reference?

Any suggestions?

Rob.

Notification

answered on 21 May 2025

1 answer

23 views

TelerikChart X-Axis Misinterprets Double Values as Categories in Blazor

Hello,

I'm having trouble configuring a TelerikChart in Blazor to properly display a column series and a line series side-by-side on the same chart.

My goal is to have the X-axis (CategoryAxis) reflect double values (e.g. 0, 5, 10, 15...) so that both series are aligned and spaced proportionally based on their actual numeric X values.

However, what I'm observing is that the X-axis seems to treat these values as categories or strings, not real numbers. This results in incorrect spacing and ordering.

What's going wrong:

The columns are not placed in the correct positions on the X-axis — for instance, a column with X = 6 appears at the far end if 6 doesn't also exist in the line series.

The values on the X-axis are not sorted numerically — so the spacing between, say, 5 and 10 is the same as between 10 and 1024, which breaks the scale.

Ideally, I want the chart to understand that X = 1024 is far from X = 50, and space it accordingly on a continuous numeric scale.

You can see the visual chart below:

The code for the chart:

@page "/test"
@using ChartLegendPosition=Telerik.Blazor.ChartLegendPosition
@using ChartSeriesType=Telerik.Blazor.ChartSeriesType
<TelerikChart>
    <ChartSeriesItems>
        <ChartSeries Type="ChartSeriesType.Line" Name="Normal Distribution" Data="@series2Data" Field="Y" CategoryField="X" CategoryAxis="Category" Axis="Value" Style="@ChartSeriesStyle.Smooth" Color="blue">
            <ChartSeriesMarkers Visible="false"/>
        </ChartSeries>
        <ChartSeries Type="ChartSeriesType.Column" Name="Histogram" Field="Y" CategoryField="X" CategoryAxis="Category" Axis="Value2" Data="@series1Data">
        </ChartSeries>
    </ChartSeriesItems>
    
    <ChartValueAxes>
        <ChartValueAxis Name="Value"></ChartValueAxis>
        <ChartValueAxis Name="Value2"></ChartValueAxis>
    </ChartValueAxes>
    
    <ChartCategoryAxes>
        <ChartCategoryAxis Name="Category">
        </ChartCategoryAxis>
    </ChartCategoryAxes>

    <ChartTitle Text="Quarterly revenue per product"></ChartTitle>

    <ChartLegend Position="ChartLegendPosition.Right">
    </ChartLegend>
</TelerikChart>

@code {
    public List<Point> series1Data = new List<Point>()
    {
        new Point { X = 0, Y = 1 },
        new Point { X = 6, Y = 2 },
        new Point { X = 12, Y = 3 },
        new Point { X = 18, Y = 4 },
        new Point { X = 24, Y = 5 },
        new Point { X = 30, Y = 6 },
        new Point { X = 36, Y = 7 },
        new Point { X = 42, Y = 8 },
        new Point { X = 48, Y = 9 },
        new Point { X = 1024, Y = 10 },
    };

    public List<Point> series2Data = new List<Point>()
    {
        new Point { X = 0, Y = 0.01 },
        new Point { X = 5, Y = 0.02 },
        new Point { X = 10, Y = 0.05 },
        new Point { X = 15, Y = 0.1 },
        new Point { X = 20, Y = 0.2 },
        new Point { X = 25, Y = 0.35 },
        new Point { X = 30, Y = 0.5 },
        new Point { X = 35, Y = 0.7 },
        new Point { X = 40, Y = 0.85 },
        new Point { X = 45, Y = 0.95 },
        new Point { X = 50, Y = 1.0 },
        new Point { X = 55, Y = 0.95 },
        new Point { X = 60, Y = 0.85 },
        new Point { X = 65, Y = 0.7 },
        new Point { X = 70, Y = 0.5 },
        new Point { X = 75, Y = 0.35 },
        new Point { X = 80, Y = 0.2 },
        new Point { X = 85, Y = 0.1 },
        new Point { X = 90, Y = 0.05 },
        new Point { X = 95, Y = 0.02 },
        new Point { X = 100, Y = 0.01 }
    };

    
    public class Point
    {
        public double X { get; set; }
        public double Y { get; set; }
    }
    
    // protected override void OnInitialized()
    // {
    //     var samples = new double[] {0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93};
    //     var std = StatisticsHelper.StandardDeviation(samples);
    //     var average = samples.Average();
    //     var yValues = StatisticsHelper.CalculateProbabilityDensityValues(samples.ToList(), std, average);
    //     
    //     series2Data = samples
    //         .Zip(yValues, (x, y) => new DistributionPoint { X = x, Y = y })
    //         .ToList();
    //     
    //     base.OnInitialized();
    // }
}

Does TelerikChart support a numeric X-axis instead of a CategoryAxis?
If so, should I be using a ChartValueAxis for the X-axis instead of a ChartCategoryAxis?

Is there a recommended way to configure a dual-axis chart where both the column and line series share a numeric X-axis?
I'd like the spacing to be consistent and reflect the actual distance between values.

PS: I also tried this with XAxes instead of CategoryAxes. But the same issue occurs.
Also I tried to use ascatterline instead of line. with type numeric on the x-axis. But then I cant add the column on that axis.

If you need more information, or if the issue is unclear, feel free to ask.

Charts

answered on 21 May 2025

1 answer

23 views

Maui Blazor Android 11 support

How could I downgrade the trial version of UI for Blazor to 7.x to test it on Android 11? I plan to use Maui Blazor. Or does the newest version support it?

Licensing

answered on 20 May 2025

0 answers

10 views

TelerikCalendar header is unexpected transparent

I'm using a TelerikCalendar component in a TelerikAnimationContainer and everything works fine, except that the calendar header is transparent and the background text is visible when the calendar pops up. I've tried setting a higher z-index to the calendar, but it doesn't helped.

<style>
    .picker-popup > .k-calendar {
		border-width: 0;
    }    
	.date-time-box-calendar {
        width: 26vw;
        height: 30vw;
        background-color: beige;
    }
</style>

<TelerikAnimationContainer @ref="@calendarContainer" Class="picker-popup k-calander">
	<TelerikCalendar class="date-time-box-calendar" Value="@Source" View="CalendarView.Month" Views="2" ValueChanged="@OnDateChangeHandler"></TelerikCalendar>
</TelerikAnimationContainer>

@{
    async Task OnClickCalendarHanlder()
    {
		await ToggleCalendar();
    }

    async Task ToggleCalendar()
    {
        await calendarContainer.ToggleAsync();
    }
}

Any idea, how can I get the calendar to most front view? What is my mistake?

Calendar

asked on 20 May 2025

1 answer

29 views

DatePicker Overflow Issue

We have a Blazor DatePicker in our web app to store the Date of Birth. The calendar popup seems to be working correctly. However, for the input portion, when typing in the year of the date, the content typed into the year overflows the input area for as long as the user types, instead of horizontally scrolling within the 4-digit year space.

The interesting thing is that this is only happening to one of our client users. We have been unable to duplicate this either locally or in our Dev/Test environments. I'm assuming that, since the horizontal scrolling of the year entry is within the DatePicker widget, could this possibly be due to an environment issue with the Blazor library or maybe some setting within Microsoft Edge?

I don't have as many details as I would like to have to share with you. At this time, I'm just trying to find out if you have ever heard of this issue before?

DatePicker

answered on 20 May 2025

1 answer

18 views

Scroll Viewer for Blazor

I'm using a splitter. But, my contents can go longer than the exposed area defined by the splitter (height). Do you have a scroll viewer for blazor or a similar layout control?

    <TelerikSplitter Orientation="SplitterOrientation.Horizontal" Height="70vh">
        <SplitterPanes>

            <SplitterPane Size="40%" Min="30%" Max="70%" Collapsible="false">

Splitter

answered on 20 May 2025

1 answer

25 views

Upload: File extensions

Is there a way to filter which file extensions are allowed to be selected? I limit to PDF or PNG but it allows me to select XML.

                   <div>
                       <hr />
                       <h4 class="gsi-padding-tb0-lr12">Upload File to Session...</h4>

                       <TelerikUpload AllowedExtensions="@( new List<string>() { ".pdf", ".png" } )"
                                      OnSelect="@OnUploadSelect"
                                      OnCancel="@OnUploadCancel"
                                      OnRemove="@OnUploadRemove">
                       </TelerikUpload>

                       <div class="demo-hint gsi-padding-tb0-lr12">
                           <small>
                               Upload <strong>PDF</strong> or <strong>PNG</strong> files with a maximum size of <strong>6MB</strong>.
                           </small>
                       </div>
                   </div>

Upload

answered on 20 May 2025

0 answers

20 views

How to control DropDownList to not auto select values as you navigate the list via keyboard

I currently have a case to where I have a DropDownList with a ValueChange(), depending on which one the user chooses, I need to throw a popup for confirmation. As the user 'scrolls' through the options with the arrow keys, this will cause that popup to be selected. Outside of this, we do not like the idea of when pressing ESC, the last highlighted value is kept.

Is there any native control to change this? We have a lame workaround but it is highly desired to have the ability to limit a selection by the ENTER key. As far as we know, this 'style' should be 508 compliant.

Ex DropDownList:
<TelerikDropDownList
Value="@cart.brand"
Id="brand_dropdown"
Data="@Organizations"
ValueField="Name"
TextField="Name"
DefaultText=" "
Width="100%"
TValue="string"
TItem="BrandViewModel"
ValueExpression="@(() => cart.brand)"
ValueChanged="@((e) => HandleSelectBrand(e))">
</TelerikDropDownList>

DropDownList

asked on 19 May 2025

2 answers

38 views

ComboBox: How to prevent Text entry

How do I prevent the user from typing text into the text field in the combobox?

                                        <TelerikComboBox @bind-Value="@SessionOptionIndex1"
                                                         Data="@SessionOption1Items"
                                                         ShowClearButton="false"
                                                         TextField="Name" ValueField="Id" />

ComboBox

answered on 16 May 2025

1 answer

16 views

Is it possible to remove successfully uploaded files from the TelerikUpload component

Hi

I have my own logic in the TelerikUpload OnSuccess Event that does some things to the uploaded files and therefore keep my own list of them. So the "File successfully uploaded" entries in the lower part of the component are useless for me.

I tried to remove them somehow in the OnSuccess Event but the only thing I found was the ClearFiles method which removes all files, even those that are still uploading. Is there a way to remove specific files from the list or an option to remove them automatically?

Upload

answered on 16 May 2025