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Overview

The Dropdown Tree control is a textbox control that allows the user to select single or multiple values from hierarchical data in a tree-like structure. It has several out-of-the-box features, such as data binding, check boxes, templates, UI customization, accessibility, and preselected values.

ASP.NET Core Dropdown Tree.


ASP.NET Core Dropdown Tree with data binding.

Data binding

You can bind data to the Dropdown Tree control from a variety of data sources. The data can be local or in any remote service and fetched using different kinds of adapters like OData, OData V4, URL, JSON, and Web API.


Render modes

The Dropdown Tree control has different render modes to visualize selected items.

Box mode

The selected items are displayed as a chip (box) in the Dropdown Tree input box.

ASP.NET Core Dropdown Tree with chip mode

Delimiter mode

The selected items are displayed with the delimiter character in the Dropdown Tree input box.

ASP.NET Core Dropdown Tree with delimiter mode

Default mode

The default mode is a combination of both the box and delimiter modes. When the control is in focus, the selected items will be displayed as chips similar to the box mode. Otherwise, the selected items will be displayed with a delimiter character as in the delimiter mode.

ASP.NET Core Dropdown Tree with default rendering mode.


ASP.NET Core Dropdown Tree with checkboxes.

Check box support

The ASP.NET Core Dropdown Tree control provides built-in support for check boxes, allowing users to select more than one item. Enabling the check boxes and auto-check functionality makes the parent and child items dependent on each other. This control also provides a Select All option of all items in the pop-up.


Multiple selection

The Dropdown Tree control allows users to select more than one item in the pop-up through the multi-selection functionality.

ASP.NET Core Dropdown Tree with multiple selection.


UI customization with templates

Use templates to change the appearance of the selection pop-up for tree items, plus the header and footer of the pop-up tree.

Header template

Design your own header for the pop-up tree using the header template.

ASP.NET Core Dropdown Tree with header template

Item template

Define the custom appearance of each tree item using the item template.

ASP.NET Core Dropdown Tree with item template

Design your own custom footer for the pop-up tree using the footer template.

ASP.NET Core Dropdown Tree with footer template


Built-in themes

Five built-in SASS-based themes are available, such as Material, Bootstrap 3, Bootstrap 4, Fabric, and high contrast.

Theme illustration for ASP.NET Core Dropdown tree


Web accessibility

  • Fully supports WAI-ARIA accessibility to make the Dropdown Tree accessible to screen readers and assistive devices.
  • Follows WAI-ARIA best practices for implementing keyboard interaction.
  • Uses WCAG 2.0-based design for UI element visuals such as foreground color, background color, line spacing, text, and images.
  • Supports right-to-left (RTL) direction for users working in RTL languages like Hebrew and Arabic.

Developer-friendly APIs

Developers can customize all UI elements and control their behaviors according to the end user’s requirements through the control’s rich set of client-side APIs.


Other frameworks

The ASP.NET Core Dropdown tree control is also available in JavaScript, React, and Vue frameworks that are built from their own TypeScript libraries.


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