EVENTS
IN OOPS ABAP
EVENT
1.
Events are like actions performed by the user.
2. Each
event must be linked to a method for writing the corresponding business logic
for the action/event raised by the user.
STEPS
FOR USING AN EVENT IN CLASS
•
DEFINE AN
EVENT.(ACTION MUST BE DEFINED).
•
DEFINE THE
METHOD.(WRITING THE DESIRED LOGIC AS PER REQUIREMENT)
•
LINK THE
EVENT AND METHOD.(AND COVERT THE METHOD INTO EVENT HANDLER METHOD)
•
RASIE AN
EVENT.(IN ANY METHOD IMPLEMENTATION)
•
USE SET
HANDLER and register event handler method to a particular instance
in the program.
SET HANDLER
•
It
is the keyword which is used to register event handler method to a particular
instance of class where the event is raised.
FOR ALL INSTANCE
•
Sometimes
we want to execute event handler methods not to a particular instance of class,
but for all the instances of the class, then we use FOR ALL INSTANCES.
EXAMPLE ON EVENTS
1.Go to SE24, provide class name as zcl_event
Steps for creating and using event
in SAP classes
•
DEFINE AN EVENT.
•
DEFINE THE METHOD.
•
LINK THE EVENT AND METHOD.
•
RASIE AN EVENT.
•
USE SET HANDLER.
Define an event
Go
to Events tab and add a event as below.
Define a method
Go
to Methods tab and create a method as below
Save, double click on the method and
add some code.
Save
and activate immediately.
Link
event and method and convert the method into event-handler method.
Now
we have to link the method to event to make the method as event handler.
Create a triggering method which
will raise the event
Event
handler method is created, now we have to trigger that event, the vent can be
triggered by using below syntax.
PARAMETERS
Use
set handler and register event handler method to a particular instance in the
program
Now
we have to register this event in our SE38 program, to register a event handler
method we use below syntax.
Now execute the program without
giving any input, the result will be
