Add support for HtmlAttributes, ContentHtmlAttributes, ImageHtmlAttributes and LinkHtmlAttributes

[kendo-bot]

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]

[Dimitar-Goshev]

Another problematic scenario with HtmlAttributes - #5731

[gyankov]

At this point adding content and link attributes cannot be achieved for the wrappers, as the core component does not expose such API.

Furthermore, adding attributes to the item (.HtmlAttributes) works for all attributes except classes (again limitation in the core component):

• https://github.com/telerik/kendo/blob/master/src/kendo.treeview.js#L514