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The ASP.NET Core TreeView is a graphical user interface control that to represents hierarchical data in a tree structure. It provides great performance with its advanced features like load on demand, checkbox support, multiple selection, tree navigation, drag and drop, tree node editing, and template support.
Bind data to the ASP.NET Core TreeView control from any valid data source, such as XML, JSON, and JSONP. The tree data can be local or remote data and fetched using different kinds of adaptors like OData, OData V4, URL, JSON, and Web API.
The ASP.NET Core TreeView control has a load-on-demand option that allows you to load huge amounts of data dynamically, which improves the control’s performance.
Also, child nodes in the control can be loaded from any web services or inserted dynamically.
Display nodes with labels and icons to present the content in a more readable format. This is helpful in making a typical directory tree and file system.
The ASP.NET Core TreeView control provides built-in support for checkboxes, allowing users to select more than one item.
The tree view checkbox has a tri-state mode also, which is applicable only for parent nodes. In this mode, the parent node will go into the indeterminate state when the child nodes are partially checked.
Tree nodes can be dragged and dropped from one parent node to another within the same level or at different levels.
Extending the drop behavior allows users to drop tree nodes from one tree view to another tree view.
Drop tree nodes to any external container or component by extending the tree view node drop action.
The ASP.NET Core TreeView control allows users to select multiple nodes. When the drag-and-drop feature is enabled, all the selected nodes can be dragged at the same time.
Edit the tree nodes’ label text on the client side by double-clicking it. When editing tree view nodes, the tree view data source will also be updated with the modified data.
Render the ASP.NET Core Treeview nodes in the ascending or descending order based on the label text for improved readability.
The ASP.NET Core TreeView control can be customized through its node template support, which allows defining a custom structure for tree nodes. You can use node templates specifically for parent nodes, child nodes, or both, and include images and any custom element structure.
Easily customize the expand and collapse icons based on the requirement of your application.
Supports right-to-left (RTL) direction for users working with right-to-left languages like Hebrew, Arabic, or Persian.
The ASP.NET Core TreeView control has a rich set of developer-friendly APIs to control all UI elements and behaviors, allowing you to provide the best experience to your end users.
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.
@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;
}TreeView control is also available in Blazor, JavaScript, Angular, React and Vue frameworks that are built from their own TypeScript libraries.
Syncfusion ASP.NET Core TreeView provides the following features:
You can find our ASP.NET Core TreeView demo here.
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
Greatness—it’s one thing to say you have it, but it means more when others recognize it. Syncfusion is proud to hold the following industry awards.
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