Last Updated: 19 Oct 2020 15:13 by ADMIN
I would like to be able to theme other, non-kendo controls to match kendo controls.  Some controls such as textarea i am able to do this with no problem with a k-textbox class, but i would also like to grandularly be able to set just the background to k-theme-background, foreground to k-theme-foreground, etc. This way if i use properties like this, they update with the kendo theme.
Last Updated: 16 Oct 2020 13:48 by ADMIN

As the title says, I'm getting script errors when attempting to perform a delete function with an MVC grid when in MobileMode.Phone.  The attached project will illustrate the problem.  Just run it and select delete button for one of the items in the far right column.  A popup will appear, but don't click either of the buttons on it yet.  Inspect the html with whatever browser you use (I'm using chrome so I just right click and choose select).  There will be a "Cannot read property 'data' of undefined" error.  If you then click the "Delete" button, you'll get a "Cannot read property 'resolve' of undefined".  Then click on the "Cancel" button and you'll get "Cannot read property 'reject' of undefined".  I'll attach a pic showing these errors.

I need to be able to utilize my grid in mobile phone mode and delete items.  Please help with this.

Also, to get this sample project small enough, I removed the files from the MobileSaveError\lib\KENDOUIMVC\2020.3.915.545 folder.  I figure you can replace those easily enough.  Is that the right thing to do in this case?  I thought maybe I could remove the items in the Packages folder as NuGet/VS will usually restore those.  But wasn't 100% sure on that.  So if you can tell me or link me to an article about what we can remove to shrink the project size for samples when we need to send them, that would be great.

Thank you,

Last Updated: 16 Oct 2020 07:06 by ADMIN
Scheduled for 2020.R3.SP.next

Describe the bug
The TextArea has 14 px font-size and the other inputs have 100% font-size.

Reported in: 1486377

To reproduce

  1. Use the LESS-based theme.
  2. Implement a TextArea component.
  3. Implement a TextBox component.

Expected behavior
The font-sizes for the TextArea and the TextBox have to be equal.


  • Kendo UI version: 2020.3.915
  • Browser: [all]
Last Updated: 12 Oct 2020 11:04 by ADMIN
I would like to use the paging buttons on a horizontal timeline to advance to the next and previous event. There is a work around with script but it does not address the first page and last page of the timeline. 
Last Updated: 07 Oct 2020 13:59 by ADMIN

### Bug report

When the GroupPaging option is enabled and the grid is bound to a DataTable, the server error "Value cannot be null" is observed.

### Environment

* **Kendo UI version:** 2020.3.915
* **jQuery version:** 1.12.4
* **Browser:** [all] 

Last Updated: 07 Oct 2020 07:44 by ADMIN
The Spreadsheet does not support cell formatting with exponent (scientific) notation.  For example, a cell currently displays a value as 0.0000000177 while the formula bar displays it as 1.77e-8. When working with scientific data the ability to format a cell value using exponent (scientific) notation would be an extremely valuable feature.
Last Updated: 14 Sep 2020 08:10 by ADMIN
Scheduled for 2020.R3
Created by: Martin
Comments: 2
Category: TreeList
Type: Bug Report

Dear support,

Your documentation clearly states that there is an option to export all pages:

Exporting All Data

By default, the Telerik UI TreeList for ASP.NET MVC exports only the current page of data. To export all pages, set the AllPages option to true.

@(Html.Kendo().TreeList<Kendo.Mvc.Examples.Models.TreeList.EmployeeDirectoryModel>() .Name("treelist") .Toolbar(tools => tools.Excel()) .Excel(excel => excel.AllPages(true)) .DataSource(dataSource => dataSource .Read(read => read.Action("All", "EmployeeDirectory")) ) )


However, when I try this, AllPages gives a compiler error:

Severity Code Description Project File Line Suppression State
Error CS1061 'TreeListExcelSettingsBuilder<dynamic>' does not contain a definition for 'AllPages' and no accessible extension method 'AllPages' accepting a first argument of type 'TreeListExcelSettingsBuilder<dynamic>' could be found (are you missing a using directive or an assembly reference?) StarPMWeb C:\TFS2015\StarPMWeb\StarPMWeb.root\MAIN\Enhancements\WIPProvisions_MR\StarPMWeb\Areas\WIPPROVISIONS\Views\ParentChildPeriod\_RenderParentChildEditPeriodGrid.cshtml 706 Active

Why is this happening? Is your documentation just wrong?

I am using version 2020.1.114

If this AllPages option is not currently implemented, can you please add this to the roadmap? It seems to be a strange omission.


Last Updated: 14 Sep 2020 08:05 by ADMIN
Scheduled for 2020.R3

Bug report

Exemplary configuration:

	.Scrollable(s => s.Enabled(true).Height("auto"))
	.DataSource(dataSource => dataSource
		.Model(model => model.Id(p => p.PrimaryKey))
		.Read(read => read.Action("Read", "Home")) 
		.Sort(sort => sort.Add("ColumnDate").Descending())
	.Resizable(resize => resize.Columns(true))
	.Columns(columns =>
		columns.Group(group => group
			.HeaderTemplate(@<text><a class='k-link myHeaderTemplate' href=''>@ViewBag.MyHeaderTitle</a></text>)
			.Columns(c =>
				c.Bound(x => x.Field1).Width("10%");
				c.Bound(x => x.Field2).Width("15%");
		columns.Bound(c => c.Field3)
			.Filterable(ftb => ftb.Operators(op => op.ForString(str => str.Clear().Contains("Contains"))));
		columns.Bound(c => c.Field4);
		columns.Bound(c => c.Field5).Hidden(true).Format("{0:dd-MM-yyyy hh:mm:ss tt}").Filterable(f => f.UI("dateFilter").Cell(cell=>cell.ShowOperators(false)));
		columns.Bound(c => c.Field5).HtmlAttributes(new {style="text-align:right" })
			.Filterable(f=> f.Cell(c=>c.Template("intFilter")))
			.HeaderHtmlAttributes(new { style="text-align:right" });
		columns.Bound(c => c.Field6).Filterable( f=>f.Cell(cell=>cell.ShowOperators(false).Operator("contains")));
		columns.Bound(c => c.Field7);
		columns.Bound(c => c.Field8);
	.Filterable(ftb => ftb.Mode(GridFilterMode.Row))
    .Pageable(pager => pager
        .PageSizes(new int[] { 10, 20, 30 })
    .Editable(e => e.Mode(GridEditMode.PopUp).DisplayDeleteConfirmation(false))
    .Excel(excel => excel
        .ProxyURL(Url.Action("Excel_Export_Save", "Grid"))

For a sample project, contact Ivan Danchev or Georgi Yankov.

Reproduction of the problem

If one of the columns (e.g. Field6) has a long header title calling the autoFitColumn and passing the column to it does not properly resize the column. The column remains narrow and its header text remains cut off.

Similarly, the method does not have the expected effect on columns with shorter text in the header, i.e. they remain wide instead of shrinking to the text length.

Current behavior

Incorrect column resizing.

Expected/desired behavior

Correct column resizing.


  • Kendo UI version: 2020.2.617
  • jQuery version: x.y
  • Browser: [all]
Last Updated: 14 Sep 2020 08:03 by ADMIN
Scheduled for 2020.R3

Bug report

Reproduction of the problem

The configuration for scale.rangeSize is not available for UI for ASP.NET MVC Wrappers (works with .NET Core)

Current behavior

When attempting to set the scale.rangeSize, the following error appears:

Error CS1061 'GaugeLinearScaleBuilder' does not contain a definition for 'RangeSize' and no accessible extension method 'RangeSize' accepting a first argument of type 'GaugeLinearScaleBuilder' could be found (are you missing a using directive or an assembly reference?)

Expected/desired behavior

This configuration should be included in future releases.


  • Kendo UI version: 2020.2.513
Last Updated: 10 Sep 2020 12:21 by ADMIN
Created by: Nouman
Comments: 5
Category: ListBox
Type: Feature Request
Although that the ListBox is similar to the MultiSelect, at the moment it does not have such model binding, because it is also comparable with the data management widgets and for the initial release of the ListBox our developers decided to consider the model binding only if there is demand for it. With that in mind, you could create a feature request in our public portal for that feature: 

Last Updated: 02 Sep 2020 11:09 by ADMIN
Hi Team,

I would like to request the ability to reassign the context of a function in the Kendo UI Grid events.  For example, using the DataBound event, setting This to not be the Grid (e.sender) This would be useful to be able to use my TypeScript class methods.

Thank you.
Last Updated: 31 Aug 2020 10:47 by ADMIN
Created by: Narendra
Comments: 4
Category: PDFViewer
Type: Feature Request
Can you implement a scrollbar for the PDF viewer control? The current scrolling doesn't allow the user to grab the scrollbar and do the scrolling.
Last Updated: 31 Aug 2020 08:01 by ADMIN
It would allow the drawer to be used as a navigation toll and more responsive site if instead of having to build is item via a template to define items like the tabstrip widget and each item defined to support Loadcontentfrom.


              .Items(i =>
                  i.Add().Text("Dimensions & Weights")



Last Updated: 17 Aug 2020 12:08 by ADMIN
Created by: Carlos
Comments: 0
Category: FileManager
Type: Feature Request

If you got to this demo https://demos.telerik.com/aspnet-mvc/filemanager and create a nested folder it is not possible to drag it to root level later on.

Please provide support for drag and drop functionality to root level.

Last Updated: 22 Jul 2020 19:45 by ADMIN

When using the Telerik upgrade wizard I get a error while upgrading my web app:


An error occurred while running the wizard.

Error executing custom action Telerik.KendoUI.Mvc.VSX.Actions.MultiProjectUpdateReferencesAction: System.NullReferenceException: Object reference not set to an instance of an object.
   at Telerik.VSX.Internal.ProjectManagement.ProjectAssemblyReferenceBase.Equals(AssemblyWrap assemblyReference)
   at Telerik.VSX.ProjectConfiguration.ProjectReferenceManager.EnsureDifferentExistingReferenceRemoved(AssemblyWrap assemblyReference)
   at Telerik.VSX.ProjectConfiguration.ProjectReferenceManager.AddAssemblyReference(AssemblyWrap assemblyReference)
   at Telerik.VSX.ProjectConfigurators.ApplicationReferenceManager.AddReferences()
   at Telerik.VSX.ProjectConfigurators.ApplicationReferenceManager.UpdateReferences()
   at Telerik.VSX.Actions.UpdateReferencesAction.UpdateReferences(IProjectWrapUIComponents projectWrap)
   at Telerik.VSX.Actions.UpdateReferencesAction.Execute(WizardContext wizardContext, IPropertyDataDictionary arguments, IProjectWrap project)
   at Telerik.VSX.Actions.ProjectActionBase.Telerik.VSX.Actions.IProjectAction.Execute(IWizardContext wizardContext, IPropertyDataDictionary arguments, IProjectWrap projectWrap)
   at Telerik.VSX.Actions.MultiProjectActionBase`1.Execute(WizardContext wizardContext, IPropertyDataDictionary arguments)
   at Telerik.VSX.Actions.MultiProjectUpdateReferencesActionBase`1.Execute(WizardContext wizardContext, IPropertyDataDictionary arguments)
   at Telerik.VSX.WizardEngine.Actions.ActionBase.Telerik.WizardFramework.IAction.Execute(IWizardContext wizardContext, IPropertyDataDictionary arguments)
   at Telerik.VSX.WizardEngine.ActionManager.ExecActions()
Last Updated: 21 Jul 2020 11:40 by ADMIN
Created by: Margarita
Comments: 0
Category: PDFViewer
Type: Feature Request

Currently, the search in PDF Viewer is performed on every keypress in the search input field. 

The search performance of the widget could be improved if there is a possibility to perform a search on pressing "Enter". Another valuable enhancement could be a configuration that allows the search to be performed after entering a certain number of symbols. 

Last Updated: 21 Jul 2020 07:26 by ADMIN
Created by: Telerik
Comments: 0
Category: Gauge
Type: Feature Request
Implement an option for splitting the labels of the Linear Gauge into multiple lines. For example, this can be achieved for Chart Category Axis Labels: https://docs.telerik.com/kendo-ui/controls/charts/how-to/appearance/show-axis-labels-in-two-rows
Last Updated: 20 Jul 2020 13:38 by ADMIN

Aligning numeric values in grids is common place and best practise.  Kendo Grid does not provide any neat functionality for this, especially in MVC where the model is strongly typed. Where a MVC grid is bound to a model, the Razor Wrapper would work better if it right aligned columns if for example type int (or other numeric types which are better to be right aligned). Where this needs not to be the case a data annotation would suit.


public class MyModel
   public int ProductID {get; set;}

   public int Age {get; set; } // aligned right by default in Kendo Grid because of int type

In the above case ProductID would be left aligned, and Age would be right (which could be the default for all integer types)

With this functionality the razor implementation could also provide an align property to override align functionality.  An AutoAlign property could provide this functionalityto auto detect from model  or not (and also allow this functionality as being off to provide backwards compatibility)

@(Html.Kendo().Grid<MyModel>() .Name("grid")
.AutoAlign(false) .Columns(columns => { columns.Bound(c => c.ProductID).AlignRight(false) columns.Bound(c => c.Age).AlignRight(True) })

Last Updated: 17 Jul 2020 13:49 by loi

Bug report

Reproduction of the problem

  1. Go to the Themebuilder page
  2. Select BlueOpal theme
  3. Modify the "Error" color.
  4. Download the custom theme

Current behavior

The generated kendo.custom.css file contains the following rule:

undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined .k-text-error {
  color: #7030a0;

Expected/desired behavior

The rule should have correct selector, or if it is redundant it should not be included in the file.


  • Kendo UI version: 2020.2.617
  • jQuery version: x.y
  • Browser: [all]
Last Updated: 07 Jul 2020 16:35 by ADMIN

Bug report

When the new TextBoxFor with a Floating label is used as editor for the String fields the label overlaps populated fields.

for MVC and MVC Core

Reproduction of the problem

@Html.Kendo().TextBoxFor(model => model).Label(l => l.Content("Name").Floating())

Expected/desired behavior

Floating label should not overlap populated fields


Kendo UI version: 2020.2.513 or above
Browser: [all]

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