Ajax Data Binding

The DropDownTree provides support for remote data binding by using a DataSource configuration object.

@(Html.Kendo().DropDownTree()
    .Name("dropdowntree")
    .DataTextField("Name")
    .DataValueField("id")
    .DataSource(dataSource => dataSource
        .Read(read => read
            .Action("Read_DropDownTreeData", "Home")
        )
    )
)
public static IList<HierarchicalViewModel> GetHierarchicalData()
{
    var result = new List<HierarchicalViewModel>()
    {
        new HierarchicalViewModel() { ID = 1, ParentID = null, HasChildren = true, Name = "Parent item" },
        new HierarchicalViewModel() { ID = 2, ParentID = 1, HasChildren = true, Name = "Parent item" },
        new HierarchicalViewModel() { ID = 3, ParentID = 1, HasChildren = false, Name = "Item" },
        new HierarchicalViewModel() { ID = 4, ParentID = 2, HasChildren = false, Name = "Item" },
        new HierarchicalViewModel() { ID = 5, ParentID = 2, HasChildren = false, Name = "Item" }
    };

    return result;
}

public IActionResult Read_DropDownTreeData(int? id)
{
    var result = GetHierarchicalData()
        .Where(x => id.HasValue ? x.ParentID == id : x.ParentID == null)
        .Select(item => new {
            id = item.ID,
            Name = item.Name,
            hasChildren = item.HasChildren
        });

    return Json(result);
}

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