RadControls for ASP.NET AJAX
Since Q3 2011 RadInput introduces a new rendering mode for its controls, where only one input element
of type text is used.
Since Q1 2012 this mode is enabled by default for the RadInput controls. It could be
disables by setting the EnableSingleInputRendering property to "false".
The main idea of this feature is to optimize the input rendering and Client-Side API. By using the single input
rendering mode only two main HTML elements are rendered on the page, instead of two or three (depending on the specific
RadInput) which are rendered in the non-single mode of the RadInput controls.
The two main HTML elements of the RadInput in single input rendering mode are:
Since Q2 2012 some changes were made to the rendering engine of RadInput:
Render one input element that to be visible all the time like in Q2 2012.
Do not use SPAN element like in Q3 2011.
Render only one input like in Q2 2012.
Set validators to access different value from the visible one to work with cultures properly.
Provide a way for showing different text in the input, without changing the validation value, in order to show empty/error
messages dynamically on all Input controls.
Getting a reference to the input area DOM element when SingleInputRendering is enabled
Due to the rendering difference when the SingleInputRendering mode is
enabled the input DOM element could be accessed on the client directly with the control's server ID.
Therefore, it is no longer needed to use "_text" to access the DOM element on the client.
function getElement(sender, eventArgs)
var inputElement = $get('<%=RadInput1.ClientID%>');
Focus input element when SingleInputRendering is enabled
In order to properly focus the input element, you should directy pass the client ID of the RadInput control to the specific Focus() method, instead of using "_text".
If you disable the RadInput control, its value will not be persisted on the server.
More information about W3C recommendations on disabled controls can be gathered