Bug report

The TreeView rendering in UI for ASP.NET MVC and UI for ASP.NET Core are not consistent. Setting the Id configuration for an item in UI for ASP.NET MVC renders a data-id attribute, that is missing in UI for ASP.NET Core.

Reproduction of the problem

1. Use the following TreeVIew definition

@(Html.Kendo().TreeView()
        .Name("treeview-kendo")
        .TemplateId("treeview")
        .Checkboxes(c=>c.CheckChildren(true))
        .Items(treeview =>
        {
            treeview.Add()
                .Text("My Documents")
                .Id("MyId1");

            treeview.Add()
                .Text("My Documents 2")
                .Id("MyId2");                
        })
)

Current behavior

When using the UI for ASP.NET Core the rendered <li> element does not have the data-id attribute that is present in UI for ASP.NET MVC

<li role="treeitem" class="k-item k-treeview-item k-first" data-uid="a3c937fd-1c4a-46a6-81e1-e53e1a2aeb6e" aria-checked="false" aria-selected="false" aria-expanded="false" data-expanded="false" aria-setsize="2" aria-level="1">
  <div class="k-treeview-top k-treeview-top">
    <span class="k-checkbox-wrapper" role="presentation">
      <input id="_a3c937fd-1c4a-46a6-81e1-e53e1a2aeb6e" aria-hidden="true" type="checkbox" tabindex="-1" class="k-checkbox k-checkbox-md k-rounded-md">
    </span>
    <span class="k-treeview-leaf k-in">
      <span class="k-treeview-leaf-text">My Documents</span>
    </span>
  </div>
</li>

Expected/desired behavior

Rendering should be consistent and the data-id attribute added in UI for ASP.NET Core.

Workaround

Use the HtmlAttributes configuration to add the data-id attribute

treeview.Add()
    .HtmlAttributes(new {data_id = "MyId1"})
    .Text("My Documents")
    .Id("MyId1");

Environment

• Kendo UI version: 2022.3.1109
• Browser: [all]
• Further details available in ticket 1588455

### Bug report

The attributes set through the "HtmlAttributes", "ContentHtmlAttributes", and "LinkHtmlAttributes"methods are not applied to the TreeView items.

### Reproduction of the problem

1. Create a TreeView and set attributes by using the "HtmlAttributes", "ContentHtmlAttributes", "LinkHtmlAttributes"methods:

@(Html.Kendo().TreeView()
    .Name("treeview-kendo2")
    .Items(treeview =>
    {
        treeview.Add().Text("My Documents")
        .SpriteCssClasses("k-icon k-i-globe")
        .Expanded(true)
        .Url("/")
        .HtmlAttributes(new { @class = "fairydust1" })
        .ContentHtmlAttributes(new { data_navigate = "navigate_content", @class = "trigger", title = "content_title" })
        .LinkHtmlAttributes(new { data_navigate = "navigate_link", @class = "trigger", title = "content_link" });
    })
)

2. Run the page and inspect the TreeView item.

### Expected/desired behavior

The attributes are serialized and rendered.

### Environment

* **Kendo UI version: 2021.2.616
* **jQuery version: 1.12.4
* **Browser: [all]

Bug report

Reproduction of the problem

1. Run the attached sample project:
   TelerikAspNetCoreApp100.zip
2. A child node is returned as checked from the server.
3. Note the difference between the state of the parent node checkbox in the Core TreeView (incorrect) and in the Kendo UI TreeView (correct).

Current behavior

The parent node's state remains "unchecked".

Expected/desired behavior

The parent node's state should be "indeterminate".

Workaround:

Attach a DataBound event handler to the TreeView:

<kendo-treeview name="DataRestrictionTree" load-on-demand="false" datatextfield="Name" on-data-bound="onDataBound" >

In the handler call the TreeView's updateIndeterminate API method:

function onDataBound(e) {
	var treeview = $("#DataRestrictionTree").data("kendoTreeView");
	treeview.updateIndeterminate();
}

Environment

• Kendo UI version: 2020.2.513
• jQuery version: x.y
• Browser: [all]