RadAutoCompleteBox has two different render modes that can change the actual HTML markup that is rendered. They are exposed via the RenderMode property that can have three possible values - Classic, Lightweight and Auto. This functionality was introduced in the Q2 2014 version.
The possible options are:
Classic - this is the default value of the RenderMode property. It preserves the original rendering of the control.
Auto - this mode makes each control choose the appropriate rendering mode according to the used browser - Classic or Lightweight. This functionality was added in Q2 2015.
Lightweight - with this render mode, the control yields different markup making maximum use of CSS 3 and semantic HTML. This means that we have dropped the image gradients in favor of CSS gradients. As for the skins, the main goal of using the Lightweight render mode is that image gradients could be easily replaced by CSS gradients. Thus, the amount of data that the client browser should request is sensibly decreased.
RadAutoCompleteBox, as well as the other Telerik controls that utilize render modes, supports only one type of render mode per page. This includes mode being set for a standalone instance, and a programmatically created instance. All such controls must have the same RenderMode on a given page. This also includes instances from user controls and master pages.
There are two ways to set the RenderMode for the RadAutoCompleteBox:
When the RenderMode property is set in the markup you can type in a string, when set in the code-behind it takes a member of the Telerik.Web.UI.RenderMode enum. For example:
<telerik:RadAutoCompleteBox RenderMode="Lightweight" runat="server" ID="RadAutoCompleteBox1"> </telerik:RadAutoCompleteBox>
A global setting in the web.config file that will affect the entire application, unless a concrete value is specified for a RadAutoCompleteBox instance:
- Change render mode for all RadAutoCompleteBox controls in your application:
<appSettings> <add key="Telerik.Web.UI.RenderMode" value="lightweight" /> </appSettings>
- Change render mode for all controls in your application:
<appSettings> <add key="Telerik.Web.UI.Menu.RenderMode" value="lightweight" /> </appSettings>