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.

Hello,

Please add support for sorting and filtering when the TreeList is data bound to a ExpandoObject. Currently these data operations throw an exception System.ArgumentException: Invalid property or field

TreeList REPL page with ExpandoObject

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TELERIK EDIT: This public item was created as a bug and for both ExpandoObject and Dictionary support. However:

• This is a limitation, rather than a bug, so I am converting the item to a feature request. Dynamic data support needs to be explicitly implemented.
• The required implementation for ExpandoObject and Dictionary support is different, so we are focusing this item just on ExpandoObject, which the Grid already supports. There is another item about TreeList Dictionary support.
  

Please add support for sorting and filtering when the TreeList is data bound to a Dictionary. Currently this scenario throws a runtime exception:

Error: System.ArgumentException: Invalid property or field - 'Name' for type: Dictionary`2

Test page: https://blazorrepl.telerik.com/QGYqutaM03L3tMcr53

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.

https://docs.telerik.com/blazor-ui/components/grid/selection/multiple#two-way-binding-of-selecteditems

Click the Preview button to load the example. Notice that the 3rd, 4th, and 5th rows are programmatically selected in the OnInitialized() method. Now, if you hold down the Shift key and click on the 6th row, instead of having the 3rd through 6th rows selected, we get the 1st through 6th row selected.

By design, the Shift + Click shortcut starts the selection from the last clicked row. If no click has taken place, the selection always starts from the first row. How to customize this?

For reference in Angular: https://www.telerik.com/kendo-angular-ui-develop/components/grid/api/SelectionDirective/

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

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 ***

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

I would like a feature that exposes the same behavior as the CheckParents in the TreeView. 

I'd like to prevent the user from dropping a column at a certain position when reordering. Please expose an OnColumnReorder that I can cancel to stop the reordering operation in this case.

I am using the TreeList component with hierarchical data. The CheckBoxList allows filtering only by the root items, however, I want it to be hierarchical to support filtering by child records as well. 

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.

Please add TreeList Export to Excel

Regards

Andrzej

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.

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.

From what I can see, currently the only way to set the expanded items for a TreeList is through the state.

The main problem is that the state doesn't fire the OnExpand event, meaning that if you have a server loaded tree you need to make sure to load the data before each item is expanded. It also allows for duplicates in the 'ExpandedItems' if you don't check for duplicates before adding to it.

The TreeView has an 'ExpandedItems' parameter that can be bound which is a bit nicer than using the state, but from my quick test this also doesn't fire the OnExpand event.

 

My request is for one of the following to be added:

1. Similar to how you can set the 'HasChildrenField' or 'ItemsField' on the TreeList, allow a 'IsExpandedField' value to be bound (Should fire the OnExpand when changed if possible). This would be the simplest way allow bindable control over the expansion of items while also making it so we don't have to manage duplicates in the 'ExpandedItems' collection.
   
2. Expose a method to expand/unexpand rows. This would be different to manually changing the state as it would also fire the OnExpand event for each row expanded.
   
3. Similar to the TreeView, allow an 'ExpandedItems' to be bound. Preferably this would also fire the OnExpand event.

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?

Not sure if this is a bug or missing feature, but when a user is actively doing drag and drop in the TreeList, the drag and drop should cancel as soon as they press 'Esc', just like in most apps. This is pretty standard behavior. Currently, pressing 'Esc' during drag and drop does not do anything.

If this is not a bug, could you please add this as a feature request?

Need an OnRowDoubleClick event for editing purposes.

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?