As discussed on the forum (http://www.telerik.com/forums/virtualization-for-treelist) please improve the rendering/scrolling/expanding/collapsing performance of TreeLists with many expanded rows.

Grids support virtualization and work well with hundreds of thousands of rows (http://demos.telerik.com/kendo-ui/grid/virtualization-local-data). Perhaps virtualization can be added to TreeLists to achieve similar results?

Much like how the Grid has column grouping, it would be nice if the TreeList had this as well.

http://demos.telerik.com/kendo-ui/grid/multicolumnheaders

I would like to use drag and drop on treeList to reorder rows (with same parent) like on treeView or at least to have same events (drag, dragstart, dragend, drop), where I'll be able to change behaviour.

Great work on this control boys.... I reckon it needs Filter Row, Multiple Column Sort, Paging to make it consistent with the grid.

Regards,

Scotty

Request to add Batch Editing feature for Kendo Tree List

Please, add for TreeList support of setOptions and getOptions methods.

Hi.

I would like the ability to specify a template for the toolbar in a TreeList, much like the ability in the Grid.

Thank you.

Also see
https://www.telerik.com/forums/toolbar-template-59985d731e9b

Support inline editing in Treelist

apply a row template to the TreeList !

Is there any support for checkbox columns in the treelist to behave the same way as the kendoTreeView checkboxes? 

(ie, checking or unchecking parent should check/uncheck all children? and checking or unchecking children should update parent check state (possible indeterminate states))

Please add keyboard navigation to the TreeList, just like the same feature in the Grid

Steps to reproduce bug:

• Navigate to demo with Multi-columns header https://demos.telerik.com/kendo-ui/treelist/multicolumnheaders
• Click on "Edit this example" button
• On dojo edit code to add needed lib:
• <script src="https://kendo.cdn.telerik.com/2019.1.220/js/jszip.min.js"></script>

• add also toolbar: ["excel"] on config options
• Run dojo and hit export

The result has broken Headers

When you add keybord navigation to the TreeList, alongside with the ability to drag and drop TreeList rows, keyboard events won't fire.

http://jsfiddle.net/ahz94f1j/2/

It looks more like an simple oversight, but we asked suppport and they responded that we should make a suggestion here.

Collapse state is incorrect when exporting TreeList while some nodes are collapsed.

• https://dojo.telerik.com/@pmilchev/aMUniceC 

Reproduction steps: 

• Open and run the dojo example
• Click the Export button in TreeList
• Click the toggle button of the item

Actual: Alert shows "Collapsed"

Expected: Alert shows "Expanded"

Regression introduced in 2019.2.514
Related to: https://github.com/telerik/kendo-ui-core/issues/4696 

Code: https://github.com/telerik/kendo/blame/master/src/excel/main.js#L43 

 

Bug report

TreeList autoFitColumn doesn't work properly.

Reproduction of the problem

Run the first sample from here:
https://docs.telerik.com/kendo-ui/api/javascript/ui/treelist/methods/autofitcolumn

Alternatively, open this dojo:
https://dojo.telerik.com/uvafiZeh

Current behavior

Expected/desired behavior

TicketID:

1519223

Bug report

TreeList shows wrong total and paging when we expand or collapse a row after filtering.

Reproduction of the problem

1. Go to TreeList demo link - https://demos.telerik.com/kendo-ui/treelist/index
2. On "Position" column apply filter with value "VP, Engineering"

3. After filtering only 4 rows will be visible, and the number of rows at the bottom of grid shows "1 - 4 of 4 items".
4. Now collapse the second row. Notice that the total at the grid bottom changes to "1 - 15 of 4 items" which is wrong.

Expected/desired behavior

The shown message within the pager has to be "1 - 4 of 4 items" instead of "1 - 15 of 4 items".

Environment

* **Kendo UI version:** 2019.3.1024
* **jQuery version:** 1.12.4
* **Browser:** [all] 

Bug report

If the read() method of the data source of the TreeList widget is called, the pager is not refreshed. It retains the only pages and information.

Reproduction of the problem

1. Update the data source of the TreeList widget.

2. Notice that the pager is not completely refreshed.

A Dojo sample for reproduction:

https://dojo.telerik.com/aHIPUgIz

Expected/desired behavior

Refresh the pager whenever the data source of the TreeList is refreshed.

Environment

* **Kendo UI version:** 2019.3.1023
* **jQuery version:** 1.12.4
* **Browser:** [all] 

When the Kendo UI Treelist is horizontally scrollable and a filter is applied which returns no items, the scrollbar disappears. Therefore, if the column is one of the hidden ones, it would be impossible to navigate to it in order to clear the filter. 

A Dojo sample for the reproduction of the issue:

https://dojo.telerik.com/IQuHuNej