ASP.NET Core TreeView Overview
The TreeView is part of Telerik UI for ASP.NET Core, a
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The Telerik UI TreeView TagHelper and HtmlHelper for ASP.NET Core are server-side wrappers for the Kendo UI TreeView widget.
The TreeView displays hierarchical data in a traditional tree structure.
Initializing the TreeView
The following example demonstrates how to define the TreeView.
@(Html.Kendo().TreeView()
.Name("treeview")
.DataTextField("Name")
.DataSource(dataSource => dataSource
.Read(read => read
.Action("Read_TreeViewData", "TreeView")
)
)
)
<kendo-treeview auto-bind="true" datatextfield="Name" load-on-demand="true" name="treeview">
<hierarchical-datasource>
<schema>
<hierarchical-model id="id"></hierarchical-model>
</schema>
<transport>
<read url="@Url.Action("Read_TreeViewData", "TreeView")" cache="true" />
</transport>
</hierarchical-datasource>
</kendo-treeview>
public static IList<HierarchicalViewModel> GetHierarchicalData()
{
var result = new List<HierarchicalViewModel>()
{
new HierarchicalViewModel() { ID = 1, ParendID = null, HasChildren = true, Name = "Parent item" },
new HierarchicalViewModel() { ID = 2, ParendID = 1, HasChildren = true, Name = "Parent item" },
new HierarchicalViewModel() { ID = 3, ParendID = 1, HasChildren = false, Name = "Item" },
new HierarchicalViewModel() { ID = 4, ParendID = 2, HasChildren = false, Name = "Item" },
new HierarchicalViewModel() { ID = 5, ParendID = 2, HasChildren = false, Name = "Item" }
};
return result;
}
public IActionResult Read_TreeViewData(int? id)
{
var result = GetHierarchicalData()
.Where(x => id.HasValue ? x.ParendID == id : x.ParendID == null)
.Select(item => new {
id = item.ID,
Name = item.Name,
expanded = item.Expanded,
imageUrl = item.ImageUrl,
hasChildren = item.HasChildren
});
return Json(result);
}
Basic Configuration
The following example demonstrates the basic configuration of the TreeView HtmlHelper and how to get the TreeView instance.
@(Html.Kendo().TreeView()
.Name("treeview")
.Checkboxes(true)
.DragAndDrop(true)
.DataTextField("Name")
.DataSource(dataSource => dataSource
.Read(read => read
.Action("Employees", "TreeView")
)
)
)
<script type="text/javascript">
$(function () {
// The Name() of the TreeView is used to get its client-side instance.
var treeview = $("#treeview").data("kendoTreeView");
console.log(treeview);
});
</script>
<kendo-treeview name="treeview2" datatextfield="FullName">
<hierarchical-datasource>
<transport>
<read url="https://demos.telerik.com/kendo-ui/service/Employees" datatype="jsonp" />
</transport>
<schema type="json">
<hierarchical-model id="EmployeeId" has-children="HasEmployees">
</hierarchical-model>
</schema>
</hierarchical-datasource>
</kendo-treeview>
<kendo-treeview name="treeView1">
<items>
<treeview-item text="Web Site" expanded="true" sprite-css-class="folder">
<items>
<treeview-item text="images" expanded="true" sprite-css-class="folder">
<items>
<treeview-item text="logo.png" sprite-css-class="image"></treeview-item>
</items>
</treeview-item>
<treeview-item text="resources" expanded="true" sprite-css-class="folder">
<items>
<treeview-item text="pdf" expanded="true" sprite-css-class="folder">
<items>
<treeview-item text="prices.pdf" sprite-css-class="pdf"></treeview-item>
</items>
</treeview-item>
</items>
</treeview-item>
<treeview-item text="index.html" sprite-css-class="html"></treeview-item>
</items>
</treeview-item>
</items>
</kendo-treeview>
Functionality and Features
- Data binding—The TreeView supports remote and local binding to data.
- Items—The Items collection holds the records displayed by the TreeView.
- Appearance—The TreeView has built-in styling options that allow you to customize its appearance.
- Dragging and dropping—The TreeView provides convenient built-in interaction.
- Checkboxes—This feature presents you with the option to have Checkboxes rendered for each item.
Next Steps
- Getting Started with the TreeView
Basic Usage of the TreeView HtmlHelper for ASP.NET Core (Demo)
Basic Usage of the TreeView TagHelper for ASP.NET Core (Demo)