Object

Actions are written in standard JavaScript, but development requires the use of an action-specific object.
An object is structural data that holds data. Objects include $ui, $const, and $comp, which have preregistered properties, and $param and $session, to which properties can be added arbitrarily.
There is also $req and $res which can only be used in REST API actions.

Object	Purpose	Description
$ui	Access to UI components	Can set/get values for registered properties
$param	Data transfer to the next ui	Can set/get any property
$session	Data transfer during a session	Can set/get any property
$const	Constant Reference	Possible to retrieve registered constant values
$req	Request data	Obtain HTTP request object in REST API action
$res	Response data	Set HTTP response object in REST API action
$comp	Dynamic component definition	Can dynamically define components within actions See Object on the Dynamic Components page for details

Note

Names of objects and functions that the service prepares in advance are marked with "$".