Editor does not support placeholder. It would be nice, to have this feature.

Posting suggestion based on forum topic: http://www.telerik.com/forums/placeholder-html-attribute

Please take a look at https://github.com/dangrossman/bootstrap-daterangepicker

It would be nice to have similar option in DatePicker - to choose range of days.

It would be great if we can have the option to have a multi-month view calendar.  Like the one in the asp.net ajax suite.
 
http://demos.telerik.com/aspnet-ajax/calendar/examples/functionality/multimonthview/defaultcs.aspx

This is more of a feature request...

If I want to refresh a datasource every 60 seconds, be it a grid, a dropdown, etc., I have to add a snippet of code something like this:

var interval = 60000;

         setInterval(function()

         {
             $("#my-grid").data("kendoGrid").dataSource.read();
         }, interval);

Yes, I realize this is trivial, but it would be nice if you could add an AutoRefresh function directly to the DataSource API that handled all of this under the covers.  Example:

           .DataSource(dataSource => dataSource
               .WebApi()
               .PageSize(20)
               .Model(model =>
               {
                   model.Id(m => m.StoreId);
               })
               .Read(read => read.Url(Url.HttpRouteUrl("GetData", null)).Data("additionalData"))
               .AutoRefresh(60) // seconds
               .Events(e => e.Error("onError"))
           )

At present, popup notifications stay in one place on the screen and if you resize the browser while there is a visible notification, it will no longer be in the expected corner of the viewport (e.g., the bottom right) - they may be somewhere around the middle or outside of the visible viewport.

The following article shows how you can reposition them with your own by calculating the new position rules: https://docs.telerik.com/kendo-ui/controls/layout/notification/how-to/move-on-window-resize.

An alternative that may be simpler is to use your own container with fixed positioning and use inline notifications in it, instead of popup notifications. With this this, you can define such a fixed position on your div that satisfies the layout and the notifications will add content to it. An example is available in the following article: https://docs.telerik.com/kendo-ui/controls/layout/notification/how-to/move-on-notification-hide.

Ideally, this feature will be built-in behind a property that will have the notification attach a handler to window.resize and will reposition the popupts automatically, maybe with a configurable delay (that is, how often after resizing the code should run). Perhaps a property like "resizeRepositionTimeout: number" can be used for both - if unset, it will default to undefined and no repositioning will occur, if set to a number, it will be used to throttle the resize event.

I'm resurrecting this on the suggestion of Todd Anglin.  An earlier request for this feature was declined because modern browsers include spell check.

However, there are many use cases where this is no use.  In my particular case I need:

   - Spell Check to work in IE8
   - Custom (and programmatically accessible) dictionaries
   - The ability to programmatically turn spell check on/off on a field by field basis

It takes lot of time for rending thousands of records from client side, some times browse gets crashed, causes performance issue. Virtualization support will help us to overcome this issue, as the same provided in Angular 1.x and Kendo MVC controls. Can you please provide virtualization support for Autocomplete & Multi Select controls.

It would be nice to have a built in PDF viewer control in the Kendo UI and Kendo UI Mobile. Especially Mobile so we do not have to search the net for decent controls that may or may not work for the different devices.

Some kind of animation for the splitters when you collapse/expand them?
Even nowadays there are people not used to the web environment, and if the collapsible pane just hides instantly (or almost) they will first think 'Where did my *whatever* went!?' so having some kind of easing they would see where did it go.

If I read https://docs.telerik.com/kendo-ui/AngularJS/introduction I find “Setting Handlers through k-on Attribute” which suggests that I should be able to write `k-on-` prior to any of the events documented at https://docs.telerik.com/kendo-ui/api/javascript/ui/upload#events and automatically run under `$apply()` or `$applyAsync()`. However, when I try that, my event handler doesn’t even run at all.

I think this is an oversight.

I can reproduce this in https://dojo.telerik.com/ocESevUS which is generated from the link at https://demos.telerik.com/kendo-ui/upload/angular which uses AngularJS v1.7.2 and Kendo UI v2018.3.1017.

Steps to reproduce:

1. Go to https://demos.telerik.com/kendo-ui/editor/index using IE11

2. Delete a sentence in the editor by repeatedly pressing the backspace key.

Result:

The characters are deleted slowly with noticeable lag and jank.

Investigation

The following profile shows the FPS drop when you repeatedly press backspace.

 

I believe the call to refreshTools is expensive (for IE) and it is invoked on every keyup for backspace.

The "change" event on DropDownList is being triggered when the value change of the widget is via API and not triggered by user interaction.

Steps to reproduce:

https://dojo.telerik.com/oKeBEZUN

1. Manually select a value for category (like Category 4); a console item should be written for user change
2. Click the "change doc to empty" button which clears the category
3. Click the "change doc to values" button which programmatically sets the category

Expected: a log item is NOT added because the change was programmatic and the log item is triggered on "change"
Actual: a log item is added even though the value change was programmatic

The change detection inside the select widget is faulty in that it seems to be effected by focus/blur state.

This issue was found after upgrading kendo UI.  I believe the issue was introduced in 2018.1.117

When using aggregates, it should be possible to define your own aggregate function, or even set it globally for kendo, so it could be used in other places. i.e. 

currently you can only specify the function name like 'sum', 'avg', etc. with this idea you could give the whole function like function(arguments...) {}

Also from what I saw it would be nice to have the `functions` object from kendo.data.js accessible, so you could add your custom functions, like:
`kendo.data.aggregate_functions['median'] = function(arguments...) {}` 

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.

Adding the same functionality as filterable.extra but in row mode. Similar to the following demo http://dojo.telerik.com/AkaYi/2.

When using AngularJS binding for dropdownlist options in the latest version of Kendo (2018.3.1017), the option labels are not dynamically bound to the scope/controller.  I changed one of the options to have the label {{::foo}} and set the field foo to "BAR" when initializing the scope.  When I run this code with the latest version, the literal text "{{::foo}}" is displayed for the first item of the drop down.  When I use an older version of Kendo (2018.2.516), the text "BAR" is displayed for that item.  This is a regression bug that is causing an error in our product.

Here is a testcase that illustrates the problem.  To toggle between the working and broken versions, change the CDN values.

https://dojo.telerik.com/umuqaFaT

Hello,

The Kendo UI Window features in many widgets as an editable popup and form container - like the Kendo UI Grid and TreeList, the Kendo UI Diagram and it would be great to be able to keep using it and open it elsewhere dynamically as right now this takes no effect.:

Thank you for voting!

Currently events >24h are automatically shown in the all day area. This is confusing if the event starts or ends somewhere during the day. E.g. it starts at 5 p.m. on tuesday and ends on 11 a.m. on thursday.

Noone knows when the resource is really available if the event is shown as all day from tuesday to thursday.

There should be an option to turn that behaviour off and show such events as regular events.

Maybe the only thing needing change is this line in _renderEvents:
var isMultiDayEvent = event.isAllDay || event.end.getTime() - event.start.getTime() >= MS_PER_DAY;

i hope i can configure working day and off day

Allow the customers to show and edit flow documents (DOCX and RTF).