I would like the TreeList to support row virtualization. It will be useful when working with large data.

Please add TreeList Export to Excel

Regards

Andrzej

I would like to start the tree grid with all rows collapsed. At the moment I can do this only through load on demand.

*** Thread created by admin on customer behalf ***

I would like to have an event equivalent to the OnRead for the Grid so that I could make custom data operations such as applying custom filtering to the root items. 

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ADMIN EDIT

In the meantime, loading data on demand only when a node expands can make database queries happen less often and return less data: https://docs.telerik.com/blazor-ui/components/treelist/data-binding/load-on-demand

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Need an OnRowDoubleClick event for editing purposes.

I want to show the totals in my hierarchical data

In the TreeList control of Blazor UI suite, I did not see any option to group header for columns. Column group header is an important feature and will certainly enhance the utility of the control multifold.

Below are few samples of column group headers:

 

I want to bind the treelist to dynamic objects like I can the grid: https://github.com/telerik/blazor-ui/tree/master/grid/binding-to-expando-object.

Telerik blazor TreeList required ContextMenu Event on each row.

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ADMIN EDIT

In the meantime, you can consider using one of the templates of the component (row or cell) to integrate the context menu in. A similar example is also available in this article even if it is for the grid, and this one for the treeview, the same concepts will apply to the treelist. You can also use a button whose click can integrate the context menu if that will fit your UX.

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I'm using Telerik TreeList. I'm so happy that it supports Drag&Drop. But, if there are too many items on the list, it is really hard to drag an item from the top to the end of the list. The TreeList doesn't scroll the list automatically (Auto Scroll) when I drag an item to the edge of the TreeList.

It would be nice to have the same capabilities for working with TreeList columns as in the ColumnMenu for Grid. Espesially columns chooser. 

Unlike the grid, you don't have an OnRowClick event that will overcome the async limitations you indicate in the docs and support for OnSelect. Since everything I have is async, the binding solution just doesn't do enough if I can't catch the click. Is there an alternative to OnRowClick for the TreeList? If not, why not?

The TreeList should add an event OnDragStatus that would query the app during active dragging to determine if the current drag location is valid or not. If invalid, it could show the invalid drag icon:

This would give better feedback to the user during dragging.

Could you add this as a feature request please?

I now have a treelist with a few thousand items, but the filtering takes a few seconds, and halfway there is a refresh with partial results.

Now the users are complaining that they do not really know when the treelist is done with filtering.

Is it possible to specify different editor templates for different levels in hierarchical data?

What I am trying to do is to build a hierarchical structure for grouping items. The list of items is specified so, in the grouping hierarchy, I want to select an item as the child element of the lowest grouping level rather than typing the name of the item and resolving if it exists. I thus want for the lowest level, to have a combobox rather than an editbox. The data items presented in the treelist have a property to bind to.

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ADMIN EDIT

If your models already have flags denoting their level, or otherwise denoting the special need for that particular model, you can use them in the editor template already.

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Currently, the TreeList CheckBox selection exposes an option to select the children if the parents are selected. Please also add support for CheckParents option similar to the one in the TreeView component. This will allow marking the parent as selected if its children are selected.

At the moment, clicking a row always alters the selection. I want to use only the selection column for selection so row clicks don't change it. A key issue is that when SelectChildren is set to true it only works for the checkbox, so clicking the row removes the selected children, and I don't want that.

Please add TreeList Drag Drop Feature

Regards

Andrzej

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ADMIN EDIT

This feature will arrive with the same feature for the grid in the 2.24.0 release in mid-May 2021.

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Currently, the DisplayFormat attribute is applied only to the values displayed in the Grid, while the checkbox list filter options remain unaffected by this formatting.

The DisplayFormat attribute should also impact the checkbox list options, providing consistent formatting across the entire Grid.

Would it be possible to have the ability to create compact TreeList's similar to how we can now in a Grid? Since Size=ThemeConstants.Grid.Size.Small is available a Grid now it seems natural this would be a next step. If we can be provided with a work around for the time being that would be great.