5 answers

479 views

Telerik UI for ASP.NET Core versioning feedback

We need your feedback, because we are considering changes in the release approach for Telerik UI for ASP.NET Core. Please provide your feedback in the comments section below:

1. Is it hard to understand the version numbers of our releases? If yes, what makes them hard to understand them?

2. Would semantic versioning (SemVer) of our releases make it easier to understand our version numbers and what's behind them?

3. If we go with SemVer, we might need to start with version 3000.0.0 as we currently use 2022.x.x. Please share your thoughts about this approach and ideas for what number versioning would work best for you.

General Discussions

answered on 05 Feb 2024

1 answer

448 views

URGENT: ListView completely broken v2023.1.314

Hi!

The ListView is breaking my web application, and I cannot make head or tail of the reason:

An unhandled exception occurred while processing the request.

NotSupportedException: "ClientTemplateId or ClientTemplateHandler" cannot be null or empty.

Kendo.Mvc.UI.ListView<T>.VerifySettings()

Also, you demos for the ListView are broken and the browser tab crashed after a while.

I need an urgent fix, as this is affecting the live application.

ListView

answered on 17 Mar 2023

0 answers

520 views

Grid Column Menu Unstick Message is Null

In our UI for ASP.NET Core R3 2020 (2020.3.915) release, the Column menu message of unsticking a column is "null".

This bug will be resolved in our next official release.

In the meantime, as a workaround, manually set the Unstick Column menu message:

.ColumnMenu(c => c.Messages(m => m.Unstick("Unstick Column")))

Grid

asked on 16 Sep 2020

1 answer

18 views

Radedit error - System.Security.Cryptography.CryptographicException

I have some (9) ASPX pages with RadEdit controls in my application.
Since installing the asp.net Ajax version R3 2025 and 2025.1.211 dev hotfix (from a much older version) I'm getting an error whenever IIS tries to send me any of those pages with RadEdit (I can remove the RadEdit control and get the page - without the edit area, but if I put it back, the error returns).
The full error is:
03/04/2025 15:34:02 19: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Security.Cryptography.CryptographicException: The cryptographic operation has failed!
at Telerik.Web.UI.CryptoExceptionThrower.ThrowGenericCryptoException[T]()
at Telerik.Web.UI.CryptoExceptionThrower.ThrowIfFails[T](Func`1 function)
at Telerik.Web.UI.Common.HmacEnabledCryptoService.Encrypt(String input)
at Telerik.Web.Dialogs.DialogParametersSerializer.Serialize()
at Telerik.Web.UI.DialogDefinition.get_SerializedParameters()
--- End of inner exception stack trace ---
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index)
at Telerik.Web.UI.DialogDefinitionConverter.Serialize(Object obj, JavaScriptSerializer serializer)
at System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember)
at System.Web.Script.Serialization.JavaScriptSerializer.SerializeDictionary(IDictionary o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat)
at System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember)
at System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember)
at System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, StringBuilder output, SerializationFormat serializationFormat)
at System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, SerializationFormat serializationFormat)
at Telerik.Web.UI.RadDialogOpener.DescribeComponent(IScriptDescriptor descriptor)
at Telerik.Web.UI.RadWebControl.Telerik.Web.IControl.DescribeComponent(IScriptDescriptor descriptor)
at Telerik.Web.UI.ScriptRegistrar.GetScriptDescriptors(Control control)
at Telerik.Web.UI.RadWebControl.GetScriptDescriptors()
at Telerik.Web.UI.RadWebControl.System.Web.UI.IScriptControl.GetScriptDescriptors()
at System.Web.UI.ScriptControlManager.RegisterScriptDescriptors(IScriptControl scriptControl)
at Telerik.Web.UI.RadWebControl.RegisterScriptDescriptors()
at Telerik.Web.UI.RadWebControl.Render(HtmlTextWriter writer)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
at Telerik.Web.UI.RadEditor.RenderContents(HtmlTextWriter writer)
at System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)
at Telerik.Web.UI.RadWebControl.Render(HtmlTextWriter writer)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
at Telerik.Web.UI.RadPageView.RenderContents(HtmlTextWriter writer)
at System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
at Telerik.Web.UI.RadWebControl.RenderContents(HtmlTextWriter writer)
at System.Web.UI.WebControls.WebControl.Render(HtmlTextWriter writer)
at Telerik.Web.UI.RadWebControl.Render(HtmlTextWriter writer)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer)
at System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer)
at System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer)
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
at System.Web.UI.Page.Render(HtmlTextWriter writer)
at System.Web.UI.Adapters.ControlAdapter.Render(HtmlTextWriter writer)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
at Telerik.Web.UI.RadAjaxControl.RenderPageInAjaxMode(HtmlTextWriter writer, Control page)
at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer)
at System.Web.UI.Page.Render(HtmlTextWriter writer)
at System.Web.UI.Adapters.ControlAdapter.Render(HtmlTextWriter writer)
at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter)
at System.Web.UI.Control.RenderControl(HtmlTextWriter writer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Can anyone help or advise on what may be causing this?

Editor

answered on 05 Apr 2025

1 answer

21 views

Download an Azure blob container subfolder to a listview

I have the listview code for downloading the blob container. But I need to only get a subfolder in the container, not the whole thing. Is there a way to add the variable for the subfolder or should I structure the data in Azure differently and create a new container instead of using subfolders in one container?

public static async Task<List<string>> GetUploadedImages(AzureStorageConfig _storageConfig)
{
    List<ImageViewModel> images = new List<ImageViewModel>();

    // Create BlobServiceClient from the account URI
    BlobServiceClient blobServiceClient = new BlobServiceClient(_storageConfig.ConnectionString);

    // Get reference to the container
    BlobContainerClient container = blobServiceClient.GetBlobContainerClient(_storageConfig.ImageContainer);
    

    if (container.Exists())
    {
        var data = container.GetBlobs();
        foreach (BlobItem blobItem in container.GetBlobs())
        {
            images.Add(container.Uri + "/" + blobItem.Name);
        }
    }

    return await Task.FromResult(images);
}

ListView

answered on 05 Apr 2025

1 answer

20 views

Show values on chart for pdf export

Hy,

I have the following graph that displays the values when I hover over the column with the mouse:

With the "PDF Export" button highlighted in yellow I export the graph to PDF using the chart API: https://demos.telerik.com/aspnet-core/chart-api/pdf-export

Attached you can find the export in pdf that is created.

How can I display the values of the two series in the pdf file?

Thanks for any help

Chart

answered on 04 Apr 2025

2 answers

18 views

How can I enable a standard html Select as a custom tool in the Editor in Kendo for Asp.Net Core?

I'm trying to add a standard html Select element as a custom toolbar item in the Editor. I was able to make this work up through Kendo for Asp.Net Core version 2024.Q4. Now in version 2025.Q1 the Select does not respond to clicking. A click doesn't drop down the Select so the user can choose an Option item. I added an onclick event handler, and the click event is registering, but it does not open the Select. The documentation doesn't give any reason why this should not work. The Select element and its Options look fine in the page. Any suggestions?

        //Add a dropdown tool for inserting symbols.
        string selectTitle = "Select a symbol to insert";
        //Standard html select.
        //Cannot find a way to use an html Select in Kendo 2025Q1. This worked in Kendo 2024.Q4,
        // after removing the 'ref-toolbar-tool' attribute from the div preceding the Select.
        string toolNameSelect = $"insertSymbol-{EditorIdClean}";
        string dropdownNameSelect = $"symbolSelect_{EditorIdClean}";
        string symbolSelect = $"<label for='{dropdownNameSelect}' class='visually-hidden'>Symbol:</label>" +
            $"<select id='{dropdownNameSelect}' " +
            $"title='{selectTitle}' " +
            $"aria-label='{selectTitle}' " +
            "style='width:150px' " +
            "onclick='testSymbolSelect(this)' " + //The click event is registered * the alert appears.
            "onchange='InsertSymbolSelect(this)' " +
            ">" +
            $"{symbolHtmlSelectOptions()}" +
            $"</select>";
        toolFactories.Add(tools => tools
            .CustomTemplate(x => x
                .Name(toolNameSelect)
                .Tooltip(selectTitle)
                .Template(symbolSelect)
            ));

Editor

Toolbar

answered on 03 Apr 2025

1 answer

23 views

Help with customizing grid's filter menus

I'm currently redesigning the filter menus in our MVC ASP.NET Core project. As of now, they all have the default menu:

I would like to customise the menus according to the columns' data types - have date range pickers for dates, a slider from min to max value for numbers, etc. The main point is to make the process simpler - so the users only need to input a few characters/choose a date/slide to the right number, instead of filling out this complicated configuration.

Some of such components are provided by kendo (e.g. DateRangePicker), others aren't (e.g. the above-mentioned slider; at least I didn't find anything like it), but could be implemented with a custom function. Either way, I can't seem to be able to override the default filter menu.

The only promising suggesstion on how to achieve something like this that I found was:

grid.Columns(c => c.Bound(item.Name)
       .Filterable(ftb => ftb.UI("datePickerFilter"))

function datePickerFilter(element) {
    element.kendoDateRangePicker({
        messages: {
            startLabel: "Check-In",
            endLabel: "Check-Out"
        },
        format: "MM/dd/yyyy"
    });
}

Unfortunately, it did not work. So any help, advice or personal experience with a similar issue will be very much appreciated :) Thanks.

Filter

Grid

answered on 03 Apr 2025

0 answers

18 views

Gantt not showing timeline

Hi, I copied the gantt chart demo from the link below. I do not receive any errors but nothing shows in the timeline. Any idea what I am doing wrong? thank you

ui-for-aspnet-core-examples/Telerik.Examples.RazorPages/Telerik.Examples.RazorPages/Pages/Gantt/GanttIndex.cshtml at master · telerik/ui-for-aspnet-core-examples · GitHub

Gantt

asked on 02 Apr 2025

0 answers

22 views

Loader Components as a Loading/Processing Container

How do use the Loader as a Loading Container so it covers the whole UI with a transparent overlay

@(Html.Kendo().Loader()
    .Name("loader")
    .Size(LoaderSize.Large)
    .Type(LoaderType.ConvergingSpinner)
    )

General Discussions

Loader

updated question on 28 Mar 2025