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The ASP.NET Core TreeView presents hierarchical data, such as a table of contents, organization hierarchy, or file directory, in a tree structure. A parent node can be expanded or collapsed to show or hide its child nodes. The TreeView is feature-rich, supporting data binding, loading on demand, multiple selection, drag and drop, node editing, checkboxes, templates, and more.
Load on demand (lazy load) is enabled by default to reduce bandwidth usage when consuming large amounts of data. Only first-level nodes are loaded initially, and then child nodes are loaded when their parent node is expanded.
Bind data to the TreeView component from any valid data source in JSON format. The tree data can be local or remote and retrieved via various adapters, such as OData, OData V4, URL, JSON, and web API.
TreeView has a highly responsive layout and an optimized design for desktops, touchscreens, and phones. It works well on all mobile phones that use iOS, Android, or Windows OS.
The ASP.NET Core TreeView supports load on demand, bound and unbound modes, drag and drop, multiselection, and editing.
It can be customized via node template support, which allows you to design a custom structure for tree nodes. Node templates can be used for parent nodes, child nodes, or both, and can include images and any custom element structure.
The ASP.NET Core TreeView is a graphic user interface element that displays hierarchical data as a tree structure. It can be populated with nested arrays of JSON objects from a hierarchical data source.
Cutting-edge design with several built-in themes, such as Fluent, Tailwind CSS, Bootstrap, Material, and Fabric. Utilize the online Theme Studio tool to customize themes of treeview easily.
Enable users from different locales to use the component by formatting dates, currency, and numbering to suit preferences.
Easily get started with the ASP.NET Core TreeView using a few simple lines of C# code as demonstrated below. Also explore our ASP.NET Core TreeView Example that shows you how to render and configure the TreeView in ASP.NET Core.
@using Syncfusion.EJ2
<ejs-treeview id="treedata" >
<e-treeview-fields child="ViewBag.child" dataSource="ViewBag.dataSource" id="nodeId" parentId="pid" text="nodeText" hasChildren="hasChild" expanded="expanded"></e-treeview-fields>
</ejs-treeview>public IActionResult DefaultFunctionalities()
{
List<Parentitem> parentitem = new List<Parentitem>();
List<Childitem> childitem1 = new List<Childitem>();
List<SubChilditem> subchilditem1 = new List<SubChilditem>();
parentitem.Add(new Parentitem
{
nodeId = "01",
nodeText = "Local Disk (C:)",
expanded=true,
child = childitem1,
});
childitem1.Add(new Childitem { nodeId = "01-01", nodeText = "Program Files", child=subchilditem1 });
subchilditem1.Add(new SubChilditem { nodeId = "01-01-01", nodeText = "Windows NT" });
subchilditem1.Add(new SubChilditem { nodeId = "01-01-02", nodeText = "Windows Mail" });
subchilditem1.Add(new SubChilditem { nodeId = "01-01-03", nodeText = "Windows Photo Viewer" });
List<SubChilditem> subchilditem2 = new List<SubChilditem>();
childitem1.Add(new Childitem { nodeId = "01-02", nodeText = "Users", expanded=true, child = subchilditem2 });
subchilditem2.Add(new SubChilditem { nodeId = "01-02-01", nodeText = "Smith" });
subchilditem2.Add(new SubChilditem { nodeId = "01-02-02", nodeText = "Public" });
subchilditem2.Add(new SubChilditem { nodeId = "01-02-03", nodeText = "Admin" });
List<SubChilditem> subchilditem3 = new List<SubChilditem>();
childitem1.Add(new Childitem { nodeId = "01-03", nodeText = "Windows", child = subchilditem3 });
subchilditem3.Add(new SubChilditem { nodeId = "01-03-01", nodeText = "Boot" });
subchilditem3.Add(new SubChilditem { nodeId = "01-03-02", nodeText = "FileManager" });
subchilditem3.Add(new SubChilditem { nodeId = "01-03-03", nodeText = "System32" });
List<Childitem> childitem2 = new List<Childitem>();
parentitem.Add(new Parentitem
{
nodeId = "02",
nodeText = "Local Disk (D:)",
child = childitem2,
});
List<SubChilditem> subchilditem4 = new List<SubChilditem>();
childitem2.Add(new Childitem { nodeId = "02-01", nodeText = "Personals", child=subchilditem4});
subchilditem4.Add(new SubChilditem { nodeId = "02-01-01", nodeText = "My photo.png" });
subchilditem4.Add(new SubChilditem { nodeId = "02-01-02", nodeText = "Rental document.docx" });
subchilditem4.Add(new SubChilditem { nodeId = "02-01-03", nodeText = "Pay slip.pdf" });
List<SubChilditem> subchilditem5 = new List<SubChilditem>();
childitem2.Add(new Childitem { nodeId = "02-02", nodeText = "Projects",child=subchilditem5 });
subchilditem5.Add(new SubChilditem { nodeId = "02-02-01", nodeText = "ASP Application " });
subchilditem5.Add(new SubChilditem { nodeId = "02-02-02", nodeText = "TypeScript Application" });
subchilditem5.Add(new SubChilditem { nodeId = "02-02-03", nodeText = "React Application" });
List<SubChilditem> subchilditem6 = new List<SubChilditem>();
childitem2.Add(new Childitem { nodeId = "02-02", nodeText = "Office", child = subchilditem6 });
subchilditem6.Add(new SubChilditem { nodeId = "02-03-01", nodeText = "Work details.docx " });
subchilditem6.Add(new SubChilditem { nodeId = "02-03-02", nodeText = "Weekly report.docx" });
subchilditem6.Add(new SubChilditem { nodeId = "02-03-03", nodeText = "Wish list.csv" });
List <Childitem> childitem3 = new List<Childitem>();
parentitem.Add(new Parentitem
{
nodeId = "03",
nodeText = "Local Disk (E:)",
child = childitem3,
});
List<SubChilditem> subchilditem7 = new List<SubChilditem>();
childitem3.Add(new Childitem { nodeId = "03-01", nodeText = "Pictures" , child=subchilditem7});
subchilditem7.Add(new SubChilditem { nodeId = "03-01-01", nodeText = "Wind.jpg " });
subchilditem7.Add(new SubChilditem { nodeId = "03-01-02", nodeText = "Stone.jpg" });
subchilditem7.Add(new SubChilditem { nodeId = "03-01-03", nodeText = "Home.jpg" });
List<SubChilditem> subchilditem8 = new List<SubChilditem>();
childitem3.Add(new Childitem { nodeId = "03-02", nodeText = "Documents", icon = "docx" , child=subchilditem8});
subchilditem8.Add(new SubChilditem { nodeId = "03-02-01", nodeText = "Environment Pollution.docx " });
subchilditem8.Add(new SubChilditem { nodeId = "03-02-02", nodeText = "Global Warming.ppt" });
subchilditem8.Add(new SubChilditem { nodeId = "03-02-03", nodeText = "Social Network.pdf" });
List<SubChilditem> subchilditem9 = new List<SubChilditem>();
childitem3.Add(new Childitem { nodeId = "03-03", nodeText = "Study Materials",child=subchilditem9 });
subchilditem9.Add(new SubChilditem { nodeId = "03-03-01", nodeText = "UI-Guide.pdf" });
subchilditem9.Add(new SubChilditem { nodeId = "03-03-02", nodeText = "Tutorials.zip" });
subchilditem9.Add(new SubChilditem { nodeId = "03-03-03", nodeText = "TypeScript.7z" });
ViewBag.dataSource = parentitem;
char[] value = { 'c', 'h', 'i','l','d' };
string Child = new string(value);
ViewBag.child = Child;
return View();
}
public class Parentitem
{
public string nodeId;
public string nodeText;
public string icon;
public bool expanded;
public bool selected;
public List<Childitem> child;
}
public class Childitem
{
public string nodeId;
public string nodeText;
public string icon;
public bool expanded;
public bool selected;
public List<SubChilditem> child;
}
public class SubChilditem
{
public string nodeId;
public string nodeText;
public string icon;
public bool expanded;
public bool selected;
}
Present nodes with icons or images along with content.
Built-in support to display checkboxes in each node, allowing multiple selection of nodes. Checkboxes for parent nodes also have a tri-state mode: checked, unchecked, and indeterminate state.
In ASP.NET Core TreeView, nodes can be reordered by simply dragging and dropping them.
Tree nodes can be dragged from one parent node to another within the same level or different levels.
Users can drag nodes from one TreeView to another.
Extend the drag and drop operation from TreeView to other controls like ListView.
ASP.NET Core TreeView allows users to select multiple nodes using checkboxes or the Shift and Ctrl keys.
Modify the tree nodes’ labels using the mouse, touch, or keyboard.
Sort the tree view nodes in ascending or descending order based on their labels.
Customize the content of each parent and child node using images or custom elements in the ASP.NET Core TreeView.
Easily customize the expand and collapse icons based on the requirement of your application.
Integrate a context menu into ASP.NET Core TreeView to perform node manipulations such as adding, removing, and renaming nodes.
A node’s text wraps when it reaches edge of the TreeView. The node’s height will adjust automatically based on the content.
Customize the tree nodes based on their level, such as leaf nodes, sibling nodes, first-level nodes, and second level nodes.
Add validation to the labels of tree nodes on editing, like a minimum or maximum length.
It supports tooltips for tree nodes that display information about the nodes while hovering over them. You can bind a tooltip from a data source along with node fields.
The ASP.NET Core TreeView component is easily accessed by screen readers. Complete keyboard interaction support has also been provided.
The ASP.NET Core TreeView component ensures that every cell is accessible using the keyboard. Major features like sort, select, and edit can be performed using keyboard commands alone; no mouse interaction is required. This helps in creating highly accessible applications using this component.
The ASP.NET Core TreeView has complete WAI-ARIA accessibility support. The Data Grid UI includes high-contrast visual elements that help visually impaired people to have the best viewing experience. Also, valid UI descriptions are easily accessible through assistive technologies such as screen readers.
Right-to-left rendering allows displaying the text and layout of the TreeView from right to left. This improves the user experience and accessibility for RTL languages.
TreeView is also available in Blazor, Angular, React, and Vue frameworks. Check out the different TreeView platforms from the links below,
The ASP.NET Core TreeView works well with all modern web browsers such as Chrome, Firefox, Microsoft Edge, Safari, and Opera.
Syncfusion ASP.NET Core Tree View provides the following features:
You can find our ASP.NET Core Tree View demo, which demonstrates how to render and configure the TreeView.
No, this is a commercial product and requires a paid license. However, a free community license is also available for companies and individuals whose organizations have less than $1 million USD in annual gross revenue and five or fewer developers.
A good place to start would be our comprehensive getting started documentation.
Documentation
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