Adaptive Mode
The Telerik UI for ASP.NET Core DropDownList supports an adaptive mode that renders a mobile-friendly rendering of its popup. To enable the adaptive rendering mode, set the AdaptiveMode() property to AdaptiveMode.Auto.
Starting with the 2025 Q2 release, when the adaptive rendering mode is enabled and the component is accessed on a mobile device, the popup will open as soon as the component receives focus. In previous versions, the popup only opened once the user began typing.
The DropDownList component automatically adapts to the current screen size and changes its rendering accordingly. On medium-sized screens, the suggestion list is displayed as docked to the bottom of the screen, while on smaller screens, it is rendered as a full-screen modal dialog. In all other scenarios, including when the AdaptiveMode() option is not specified or is set to its default value of AdaptiveMode.None, the standard popup is rendered docked to the input of the component.
The adaptive mode changes the rendering of the DropDownList popup element based on the screen resolution of the device (the horizontal value in px) with the following breakpoints:
- Small screens—up to 500 px.
- Medium screens—between 501 px and 768 px.
- Large screens—over 768 px.
The following example demonstrates how to enable the adaptive mode of the DropDownList by using the AdaptiveMode() option.