4) SELECTION SCREEN PROGRAMMING

SELECTION SCREEN PROGRAMMING:

It is used for designing the selection screen with different elements.

As part of selection screen,we can have the following elements .

1) Comments(labels)

2) Blocks

3) Tabbed blocks

4) Push button

5) Check boxes

6) Radio button

7) Sub screens

8) Drop down list box

9) Input/output fields

Declare parameters:

    Table name-field name

Note: Whenever a program variable needs to refer the database fields. It is not recommended to hot-code the data type and size. because in future, if the database field properties are changed, we need to modify the corresponding declarations as part of multiple programs.

This process increases the maintenance cost.

To avoid this we can refer to the element of field or directly refer to the field itself.

SELECTION EVENTS:

This events triggered on the selection screen..

1) INITIALIZATION.

• This event is triggered whenever the selection screen is displayed.
• This event can be handled to initialize the selection screen fields.
• This event can be triggered only once in the life time of a selection screen.
• First event triggered on selection screen is “INITIALIZATION”.
• By default selection screen no is “1000”.
• Whenever a selection screen element overlaps with other element, it leads to activation error.

.................................TO BE CONTINUED.....................................