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COMMAND clause is used to specify the name, key, description and help number for a menu option. It also contains the statements that are executed when this option is activated.
|
Element |
Description |
|
Key List |
A list of one or more keys that invoke the menu option |
|
MENU Option |
The clause that contains the name and description of a menu option |
|
HELP Clause |
The clause which contains help number corresponding to the menu option |
COMMAND clause can contain a nested MENU statement.
The menu option clause contains the name of the menu option and the description. Both are optional. This clause has the following syntax:
|
Element |
Description |
|
Option |
A character variable or a character string used as the name of a menu option |
|
Description |
A character variable or a character string used as the description of a menu option |
|
Expression List |
A 4GL expression that returns a name or a description of a menu option |
There are two ways of specifying the option name and the description:
In the first case where we have no separator between the option name and description
Both name and description in this case are optional
If only one of them is present, it is treated by 4GL as the option name.
Both option name and description can be represented either by a quoted character string (or other constant), or by a variable.
Typically, the variable used is of character data type, though it can be of any other simple or structured data type, provided that it makes sense as a menu option name or description.
In the second case a comma separator is present between the name and description
Both name and description in this case are obligatory
If only one of them is present a compile-time error occurs
Both name and description can be represented by a variable, a constant, or a 4GL expression
If a name or a description is represented by a 4GL expression which consists of more than one variable or has any operators, it should be enclosed in parentheses, e.g.:
MENU "my_menu"
COMMAND KEY (F1) (curr_user||status), "Press to change the user"
If the description is longer than the line at which it is displayed, the excessive symbols are truncated from the right.
If a COMMAND clause contains no option name and no description, the menu option will not be visible for a user.
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