Load Data on Demand

The TreeList can load a remote dataset dynamically as a user expands nodes. The dataset must have a plain structure.

This feature requires client- and server-side configurations. To configure the client-side part, do the following:

Send an expanded node's ID to the server
For this, implement the CustomStore's load function. In this demo, we do it in the dataSource configuration object.
Delegate filtering to the server
Set the remoteOperations.filtering property to true.
Specify the data field that defines whether the node has children
Use the hasItemsExpr property to set this data field.

Server-side implementation is available in the ASP.NET Core and ASP.NET MVC versions of this demo under the TreeListDataController.cs tab.

NOTE

This demo uses a simple data bind technique that is useful for data display purposes only. When a user clicks a node, TreeList receives a JSON object from the server, which is based on the parentIds property value. This technique does not support the built-in data process operations in TreeList on the server.

If your project needs to process data, do one of the following instead:

Implement a custom data source. See the Custom Data Source demo.
Use the DevExtreme.AspNet.Data extension as shown in the Web API Service demo.

See more Hide details

Prev Demo Next Demo

Was this demo helpful?

Thank you!

Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.

Send Feedback

Thank you!
We appreciate your feedback.

jQuery

Angular

Vue

React

AngularJS

ASP.NET Core

ASP.NET MVC

Thank you for your interest in our ASP.NET Core product libraries and UI component suite. We are moving ASP.NET Core-related demos and content to DevExpress.com. Please make sure to update your bookmarks with our new URL.

View Demo