Hi,
I am trying to load 50k records on my Kendo UI grid in MVC application, but getting performance issues and sometimes error as well. I also need to provide drag and drop grouping feature with the total of few columns, according to grouping selected.
I also need the multi-select filter with all above functionality, need it to work like a magic too, without taking a lot of time

Your help is much appreciated.

Thanks

is it possible hide unselected items in filter popup dialogue of each column of spreadsheet control?
Basically, we need this works like Excel.

Please check link out to see what I need:
https://www.screencast.com/t/doeRvn0ayl8a

I'm trying to update my node_modules with the latest default theme .scss files but the most recent build on npmjs hasn't been updated to include styles for dropdowntree, chat, etc.

    npm install @progress/kendo-theme-default

I know the kendo theme github moved to a monolith-repo.  Is there an updated NPM package?

Hello,

I am using MVC wrappers without Edit button (Add and Delete only). What is the better way to prevent to delete very last record in the grid? I could use command().hidden(bool) but have not figured out yet how to wire JavaScript function there.

Thanks.

@(Html.Kendo().Grid<WebApplication42.Models.Phone>()
        .Name("grid")
        .Columns(columns =>
        {
            columns.Bound(p => p.PhoneID);
            columns.Bound(p => p.PhoneNumberInt);
            columns.Bound(p => p.PhoneNumberString);
            columns.Command(command => { command.Edit(); command.Destroy(); }).Width(250);
        })
        .ToolBar(toolbar => toolbar.Create())
        .Editable(editable => editable.Mode(GridEditMode.InLine).ConfirmDelete("Delete").DisplayDeleteConfirmation("Are you sure to delete?"))
        .Pageable()
        .Sortable()
        .Scrollable()
        .HtmlAttributes(new { style = "auto;" })
        .DataSource(dataSource => dataSource
            .Ajax()
            .PageSize(20)
            .Model(model => model.Id(p => p.PhoneID))
            .Create(update => update.Action("EditingInline_Create", "Grid"))
            .Read(read => read.Action("EditingInline_Read", "Grid"))
            .Update(update => update.Action("EditingInline_Update", "Grid"))
            .Destroy(update => update.Action("EditingInline_Destroy", "Grid"))
            .Events(e => e.Error("onPhoneError"))

        )
)

I wondering if I've missed something, but how does one add headers to a table in the kendo Editor? 

Seems like such a basic requirement in order to produce acceptable HTML.

At the moment if I manually add the html <table><thead><th>Some header</th></thead><table> the editor shows it, but it seems that the add row tool throws an exception... And I cant see any option in the table wizard to add headers.

If I had to add a tool to toggle/insert a header row are there any examples I could follow?

As an aside this competing editor has very nice popup table tools, one of which is adding a header row, merge cells, etc:

https://www.froala.com/wysiwyg-editor/examples/table-styles 

To reproduce:

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

2. Insert a table using the table wizard. Set the background color to any color.

3. Go back into the table wizard. Set the background color to clear

Expected: the color from 2 is removed

Actual: The background color does not change

Kendo UI R2 2018

kendoTreeView has the select event to allow prevent selection, any equivalent for DropDownTree ?

We are using kendo with very large dataset.

We had issue with memory overflow with some data, and chrome crashed.

After investigation, we found that the "kendo.guid" function is the cause.

That function is called when creating observable data I think.

The memory leak is caused by the "+=" technique used to create the guid, as each += create a copy of the previous value. 

It performs very well, but each loop from 1 to 32 is causing that trouble.  And we sometimes raise the chrome RAM to 2.5 GB !!!

We changed the string to an array, and uses the "push" instead of +=.  Then, return that array.join(""). And it works perfectly, no more memory issue, with the same cpu performance and speed.

The situation where we got 2.5GB of ram used is now limited to 500MB, and is quickly going down to 100MB after the execution.

You can see the edited version there.

http://dojo.telerik.com/@foxontherock/EGEziVon/13

Just remove-add the underscore prefix to test it, hit Ctrl-Enter multiple times to repeat it, and use the "chrome task manager" to see the "javascript memory" used (you need to add that column).  You can also use the "trashcan" of the memory tab in chrome dev tools to force a garbage collection.

The edited version (guid1) is based on the "minified" version of kendo.web.js.