HP 3000 Manuals HP 3000 Manuals
Screen Field and Item Types
The type of fields or items on an application screen depends on the
screen type.
Menus
A menu presents the user with a choice of options in an application.
Menus can have any of the following actions associated with screen action
items.
Prefix Action
B- Background process
D- Menu or data screen
F- Function
H- Help screen
P- Process
R- Report
X- External program
Menus cannot contain any data input or output fields.
Data Screens and Windows
Data screens allow the user to enter data or examine information. Data
screens and windows can have data input and output fields.
A data screen cannot execute another action directly. However, function
logic blocks associated with data screen fields can execute other
actions.
Other Screen Items
All HP ALLBASE/4GL screens can have the following item types:
* Text literals
* Special text items Special text items are text items that have
specific terminal display enhancements such as inverse video,
color, blinking display, and underlining associated with them.
The display highlighting for special items does not depend on the
system-wide values defined by the system administrator. Special
text items can also use the line drawing character set on
terminals that support these characters.
* System items A system item displays the contents of any of the
following items:
- the date.
- communication area fields.
- master titles.
- application titles.
- scratch-pad fields.
- numeric constants.
- alphanumeric constants.
- variables or calculated items.