Bug report

When a user creates a filter with a date, it starts as an empty Datepicker, but the value is appearing as an empty string. Thus, if the user clicks apply, an error appears in the console. If you place a value in the DatePicker and clear it, the value will be Null.

Reproduction of the problem

1. Go to this Progress Telerik ASP.NET Core REPL.
2. Add filter for a Date but keep the datepicker empty.
3. Select apply.
4. Now, add a date and clear the value.

Current behavior

The filter menu sends isnull filter queries in the following format:

While the Filter component sends it as follows:

As a result the ToDataSourceResult method fails.

Expected/desired behavior

If the DatePicker is empty, the filter should properly perform the 'isnull' query upon clicking apply.

Environment

• Kendo UI version: 2023.2.606
• jQuery version: All Supported Versions
• Browser: all

### Bug report

When setting autoWidth: true and expanding a node, the popup's width is not adjusted based on the displayed child nodes.

### Reproduction of the problem

1) Enable the autoWidth option and open the DropDownTree.

2) Expand an item. A horizontal scrollbar appears and the width of the popup is not adjusted as expected:

A Dojo sample for reproduction: https://dojo.telerik.com/faeuFFwb/2

### Expected/desired behavior

The width of the popup must be automatically adjusted when expanding an option and the "autoWidth" option is enabled.

### Environment

* **Kendo UI version: 2025.2.702
* **jQuery version: 3.7.1
* **Browser: [all]

Bug report

When the user searches for a value in the MultiSelect and then selects an item, the search value persists.

Reproduction of the problem

1. Open the Dojo - https://dojo.telerik.com/iUvrZpNm
2. Type something (for example: 'se') in the MultiSelect and select an item

Current behavior

Even when an item is selected, the search value still appears

Expected/desired behavior

When selection is performed, the search value should be cleared

The issue is a regression starting with 2025.4.1321

Workaround:

   select: function (e) {
            e.sender.input.val("");
    },

Dojo - https://dojo.telerik.com/JCwOdXsL

Environment

• Kendo UI version: 2025.4.1321
• Browser: [all ]

Bug report

Regression introduced with 2025 Q3

TabStrip with DOM DataSource rendering does not update contentUrls when updated through the options

Reproduction of the problem

1. Open the following Telerik REPL
2. Navigate to the Script.js tab
3. Notice that the options are explicitly changed.
4. Click on the second tab.
5. Notice that the content remains unchanged.

Current behavior

TabStrip with DOM DataSource rendering does not update contentUrls when updated through the options.

Expected/desired behavior

TabStrip with DOM DataSource rendering should update contentUrls when updated through the options.

Workaround

<script>
   $(() => {
      const tabStrip = $("#tabstrip").data("kendoTabStrip");
      tabStrip._contentUrls[1] = `~/shared/web/tabstrip/ajax/ajaxcontent1.html`;
  });
</script>

Environment

• Kendo UI version: 2025.4.1217
• Browser: [all]

Bug report

When applying data validation to all cells of a xlsx file and trying to import the file via Telerik.Web.Spreadsheet as demonstrated in the Server Import/Export demo the application will crash.

Reproduction of the problem

1. Check ticket 1661158 for a sample xlsx file.
   N.B. The sample file has an AnyValidation rule applied to all cells and a title set for the cells. In addition two columns have predefined styling rules - font, fontSize, etc.
2. Try to load the file using Telerik.Web.Spreadsheet, as demonstrated in the Demo.

Current behavior

Loading will fail.

Expected/desired behavior

File should be loaded

Possibly related to #4017
In the reported scenario there are 1048576 rows, with 16384 columns, resulting in 17179869184 cells all with applied non-default validation value, and we iterate them all to set the validation value, so it can be serialized.

Environment

• Kendo UI version: 2024.3.806

Bug report

File Manager's toolbar overflow button does not show when the items are marked with the overflow setting.

Reproduction of the problem

1. Run the following dojo.
2. Set the overflow setting for one of the items in the Toolbar.

Current behavior

The overflow button is not displayed when one of the items is configured with the overflow setting.

Expected/desired behavior

The overflow button should be displayed when one of the items is configured with the overflow setting similar to the conventional toolbar widget's items.

Environment

• Kendo UI version: 2022.6.621
• Browser: [all]

Bug report

When the pasteHtml command or the paste method is used on a line that only has   or a tag these are deleted.

Reproduction of the problem

1. Run this Dojo
2. Press space a couple of times
3. Click the Add Module button
4. The spaces have disappeared

Alternatively, turn on Bold formatting without typing anything and click the Add Module button. The Bold formatting gets cleared

Expected/desired behavior

Pasting content in the Editor

Environment

• Kendo UI version: 2022.3.802

Bug report

Related to daylight saving: in the US on14 March, 2021, at 2:00AM the clocks are moved 1h forward.

Reproduction of the problem

Dojo example.

1. Set the computer's timezone to Pacific (US/Canada).
2. Double click the 2:00AM or the 2:30AM slot to add a new event.

Current behavior

The selection is moved 1h back to 1:00AM (or 1:30AM respectively) and the event is created at this time.

Expected/desired behavior

The event should be created at 3:00AM. This will be consistent with the way Outlook handles daylight saving - in a new meeting if you select 2:00AM as a start time, it is automatically changed to 3:00AM.

Environment

• Kendo UI version: 2021.1.224
• jQuery version: x.y
• Browser: [Chrome 88, IE11]

Bug report

If a ListItem element contains a margin-left style, the user can not delete the bulleted item.

Reproduction of the problem

1. Go to this Progress Kendo UI Dojo.
2. Using case 1 in the code, attempt to delete a bulleted item using the backspace.
3. Using case 2, only the last bulleted item is using margin-left and will not be able to delete.

Here is a screencast of Case 1 in action.

Expected/desired behavior

The bulleted item should be deleted when the user presses backspace.

Environment

• Kendo UI version: 2020.3.1118
• Browser: all

Hello Team,

when I add new folder then I rename it to 1.1 it show me 1.1.1 but the folder name is 1.1 and in properties 1.1 but I don't want it to show 1.1.1

the file manager add .1 automatically and if I rename it 2.2 it add .2 then the file display name 2.2 .

Please help,

Thank you,

Bug report

Reproduction of the problem

TelerikAspNetCoreApp98.zip

1. Run the attached project.
2. Focus the MultiSelect and type in "bu". The data is filtered and items matching the filter are displayed in the list.
3. Select the first item in the list
4. Type in "bu" again. The list shows the first "bu" item as selected (expected)
5. Scroll down the list, so that another page of the data is loaded
6. Now scroll up to the first item

Current behavior

The item is no longer highlighted as selected.

Expected/desired behavior

The item is highlighted as selected.

Environment

• Kendo UI version: 2020.2.513
• jQuery version: x.y
• Browser: [all]

Bug report

Gantt CurrentTimeMarker reappears after the Grid and Gantt tables are resized from the pane between them

Reproduction of the problem

1. Create a sample that contains the current date and time in it
2. Set the CurrentTimeMarker
3. Resize the Component
   

Current behavior

After the resize the marker reappears

Environment

• Kendo UI version: 2022.2.621

Hello,

On Chrome for Android, the dropdown menu appears offscreen. With Firefox for Android or Chrome desktop, it works well.
This sample reproduces the problem : https://runner.telerik.io/fullscreen/@kakone/azuPAHuy. If you click on the right item (user icon), the dropdown appears offscreen.

### Bug report

When an Editor component in inline mode is set as an editor in an InCell editable Grid, the Grid cell does not enter edit mode on "click". The issue occurs since version 2023.1.314.

### Reproduction of the problem

1) Create an InCell editable Grid.

2) Set an Editor component in inline mode as an editor to a specified Grid column.

3) Try to edit the cell.

4) The cell flashes and does not enter edit mode.

A Dojo sample for reporduction: https://dojo.telerik.com/zQUvDQEq (check out the "ProductName" column)

### Expected/desired behavior

The Grid column that uses Editor component in inline mode must be editable.

### Environment

* **Kendo UI version: since 2023.1.314
* **jQuery version: 3.4.1
* **Browser: [all]

### Bug report

Starting with version 2024.4.1112, the built-in PDF export of the Spreadsheet throws a client-side error when the sheet contains an image.

### Reproduction of the problem

1) Open the Images demo: https://demos.telerik.com/aspnet-core/spreadsheet/images

2) Export the sheet to PDF.

3) An error is logged in the browser console: "Uncaught TypeError: n.Image is not a constructor".

The last working version is 2024.3.1015.

### Expected/desired behavior

PDF export must work as expected.

### Environment

* **Kendo UI version: 2024.4.1112
* **jQuery version: 3.7.1
* **Browser: [all]

Bug report

Editor components throw AmbiguousMatchException when bound with models that have property shadowing in inheritance hierarchies.

Reproduction of the problem

1. Create a model hierarchy where a derived class shadows a base class property with new keyword
2. Bind the Editor component with the shadowed property
3. Exception is thrown during reflection

Current behavior

(optional)
The components should handle property shadowing gracefully and generate the appropriate HTML input element.

Expected/desired behavior

AmbiguousMatchException is thrown when trying to bind the component to the shadowed property.

TicketID:

1699473

Environment

• Kendo UI version: 2025.3.825
• Browser: [all]

Bug report

The Form component throws an InvalidOperationException when utilizing FormData within Razor Pages. This issue does not occur in ASP.NET MVC or standard ASP.NET Core applications. The issue appears to be linked to the following commit: 8cf517cf94dd5a13a8e8bd9f8f92db0193ea00e3.

Reproduction of the problem

1. Create an Razor Page application.
2. Add a Form with FormData
3. Run the project

Current behavior

The application throws an InvalidOperationException.

Expected/desired behavior

The application runs without any thrown exceptions.

TicketID:

1701697

Environment

• Kendo UI version: 2025.3.1002
• jQuery version: x.y
• Browser: [all]

### Bug report

When selecting the "Print" option in the PDFViewer, a large right and bottom margin is applied regardless of whether the “Margins” option is set to "None" or "Minimum".

### Reproduction of the problem

1) Open the PDFViewer Overview demo: https://demos.telerik.com/kendo-ui/pdfviewer/index

2) Select "Print" to open the print dialog

3) Notice the unexpected right and bottom margin.

The issue occurs since version 2025.2.520.

### Expected/desired behavior

The extra margins must not be applied when opening the file for printing.

### Environment

* **Kendo UI version: 2025.2.520
* **jQuery version: 3.7.1
* **Browser: [all]

### Bug report

When the TreeList is set up for Popup editing, the "required" validation triggers immediately when the Popup form is opened.

### Reproduction of the problem

1) Create a Popup editable TreeList.

2) Add the DataAnnotation [Required] attribute to any of the Model properties.

3) Click the built-in "Add new record" command.

4) The editor of the required field is automatically focused and the validation triggers immediately.

The behavior can be observed in the TreeList Popup Editing demo: https://demos.telerik.com/aspnet-core/treelist/editing-popup

### Expected/desired behavior

The validation must trigger on blur, as in the jQuery demo.

### Environment

* **Telerik UI for ASP.NET Core version: 2025.2.520
* **Browser: [all]