Kendo UI supports PDF export. It would be great if you could add glyph mirroring support to it as well (https://github.com/mozilla/pdf.js/blob/master/src/core/bidi.js). PDF export of RTL languages such as Arabic and Persian need this trick to work properly.

Please think the Kendo UI validation farmework not only in terms of client-side validation but also in terms of reporting server-side errors.

A framework that would only provide a way to display a validation error message based on a client-side rule after each related input field would not be very helpful in my opinion.

All errors need to be reported in a consistent way. My preferred option is:
- a message box at the top of a form to display all messages including OK messages and error messages (client-side and server-side).
- higlighted fields with tooltips (not to clutter the form layout) to repeat error messages in context when applicable.

Although the framework built into Kendo UI might only provide client-side validation, please make sure to provide entry points into the UI used to report errors. Alternatively, leave the UI to the developer and provide a simple way to collect all validation error messages on a form.

Today you can only export JavaScript primitive values - String, Number, Date, Boolean.

http://www.telerik.com/forums/export-grid-to-excel-cells-with-hyperlink

Add a new Kendo UI component to display a record vertically (Or add an option to the existing grid to change the orientation of the records).

Usually, I was using vertical grid to display a single record but some people might need it to display more than one record (ex: when you compare items on best-buy web site)

The vertical grid could also be used as a property grid (http://www.telerik.com/products/silverlight/controls/propertygrid.aspx).

A quarter is not the same as 3 months in the same way that a week is not the same as 7 days. Feb-Mar-Apr is not a standard quarter. Kendo automatically lines weeks up on Sundays. Please consider doing something similar for quarters.

Topojson is a much more compact data format for spatial data. Supporting it would allow more complex spatial data to be loaded without slowing down the browser experience.

Clicking an item in the parent list reveals the child list that replaces the parent list.

At the top of the child list, there is a < back item that allows returning to the parent list.

For examples, see the drawers at:

• https://www.amazon.com/
• https://www.diy.com/ (make the window small enough to display the drawer button)
  

See also https://www.telerik.com/forums/kendo-ui-drawer-subitems

https://svelte.dev/

Looks to be so much better than React.

Please add generic versions of DataSource and ObservableArray to the TypeScript definitions file.

Would like some way to know when the file is finished saving.

This is especially useful when saveAs uses a proxyURL and a user is waiting for the file to come back from the server.  Currently, there is no way to inform user of this progress or when it completes.

I know you have special tag structure so that you can implement certain features.  However, for UI elements like the drop-down, numeric input and date-picker, it would be really great to use (or have an alternative control to us) native html elements and data- attributes that are easily recognized by mobile devices and newer, desktop browsers.  For example, for the drop-down, it would be great for it to render a select so that when received by a mobile device, the native option selector can take over.  I am posting this in the Web controls for those of us creating responsive apps where the input surrounded by spans doesn't really work out very well when the page is rendered on a mobile browser.  I realize that are trade-offs so maybe instead of completely disregarding the current controls, maybe another, pure control, or some configuration option to the current controls would be preferable. That way, the developer could decide what was more important - the UI enhanced feature or compatibility with device.

The DataBound event is the last event that can be bound to at present (other than user interaction events) - this occurs before rendering. In the situation where a chart wrapper is in a hidden div to be displayed and the datasource to be re-read under certain circumstances, it would be useful to have a post render event to ensure the chart is fully drawn before displaying the div.

Please support the ImageBrowser as a standalone control.

add delay parameter in miliseconds for the kendo.ui.progress so you don't see your container blinking if your ajax calls are fast.

It would be very nice if we could export a chart (and its data) to Excel.

It would be nice that export-to-excell feature supports the text orientation which is supported by MS Office and Open Office. This feature lets the user to have vertical text in the worksheet.

Pattern fills for Chart like this one http://www.amcharts.com/demos/map-with-patterns/?

I need notification hiding to be passed when hovering over a notification.

To further explain I am expecting a behavior such in following example.
http://codeseven.github.io/toastr/demo.html