You can use the OnClientSelectedItemChanged or the OnClientItemClicked event for navigation.
The simplest and most common use for the TreeView control is navigation.
The full client API is included in the documentation. You can use the client API similarly to ASP.NET MVC's other controls (read about it here). While working with TreeView, you would often need to work with the control's client APIs. Var list = EmployeeEx.GetEmployees(leaderID) Public ActionResult LazyLoading(TreeNode node) Return View(EmployeeEx.GetEmployees(null)) The following examples use the Northwind Employee class: Controller: Otherwise, you can let the field to be null. If the child node has children, you can set an empty array to the field, and the field's name will be used for the ChildItemsPath property. In the Bind property, set the second parameter to lazyLoadActionUrl and provide a URL to obtain the node's data on demand. The TreeView control makes lazy-loading super easy. Lazy loading is useful when you're dealing with large hierarchical data sources and want to avoid the delays involved in loading an entire data set at once. You can customize this behavior by handling the TreeView drag/drop On Demand When dragging is allowed, users can drag any node to any position within the tree.
To further control editing, use the client methods OnClientNodeEditStarting, OnClientNodeEditStarted, OnClientNodeEditEnding, and & DropĪllow users to drag nodes to new positions within the treeview by setting the AllowDragging property to true. Edits made to a node's content are automatically propagated to the source collection for the field associated with DisplayMemberPath. TreeView Images EditingĪllow users to edit nodes by setting the IsReadOnly property to false. You can customize each node to display both images and text by setting the ImageMemberPath property to the image path. Set the ShowCheckBoxes property to true to display check boxes. Set the ChildItemsPath property to the collection of child nodes with the following Check Boxesĭisplaying check boxes against each node is as simple as setting a property. The DisplayMemberPath property is set to the text to be displayed in the tree nodes. Each item in the source collection has information about nodes and a collection of child nodes. New Property ,īecause the Bind property takes an IEnumerable source, you can data bind TreeView to create trees. Image = "/Content/images/electronics.png", Public static Property GetData(string val)
TreeView We'll use the following model class for most of this blog because it returns an array with hierarchical data: It is compatible with all popular browsers.Use TreeView to display the headings in a document, the entries in an index, the files and directories on a disk, or any other kind of information that would be best displayed as a hierarchy.
The generated DHTML code is compact and fast. The product uses XML for defining TreeView structure since XML is the most convenient format for structured data. Layout can be controlled by the CSS style and user-defined images. It is the perfect tool for web developers.ĪPNSoft TreeView has been designed so that it integrates into the look and feel of any web site. In addition, our ASP.NET TreeView is a flexible, reliable, and powerful product.
You do not need to learn a complex API to accomplish a task create professional looking treeviews with only a few lines of code. The main advantage over other TreeView controls is the SIMPLICITY.
Overview Features Component Parts Deployment Defining the Structure Appearance Customization Templates Server-side API XML File Database Dynamically Skins With Icons Lines HTML Formatting Templates Auto Expand/Collapse Check boxes Load On Demand Expand Single Path Client-side events Server-side selection Update PanelĪPNSoft > Products > Controls Suite > Individual controls > TreeViewĪPNSoft TreeView is an ASP.NET server control with AJAX support to display hierarchical data in a tree structure. The APNSoft TreeView will only work on JavaScript enabled browsers.