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KEY Statement Programming Example
 
These examples show how to assign values to soft keys.
 
Here is an example of assigning and disabling a soft key. KEY LIST
displays key values after KEY 4 has been assigned and again after
it has been disabled:
 
CLS                       ' Clear screen
KEY 4, "MENU" + CHR$(13)  'Assigns to soft key 4 the string
                          '"MENU" followed by a carriage return.
KEY LIST
KEY 4, ""                 'Disables soft key 4.
KEY LIST
 
Here is an example of using KEY statements to set up one-key
equivalents of menu selections. For example, pressing F1
is the same as entering the string "Add":
 
CLS                       ' Clear screen
DIM KeyText$(3)
DATA Add, Delete, Quit
' Assign soft-key strings to F1 to F3.
FOR I = 1 TO 3
   READ KeyText$(I)
   KEY I, KeyText$(I) + CHR$(13)
NEXT I
' Print menu.
PRINT "                 Main Menu" : PRINT
PRINT "           Add to list (F1)"
PRINT "           Delete from list (F2)"
PRINT "           Quit (F3)" : PRINT
' Get input and respond.
DO
   LOCATE 7,1 : PRINT SPACE$(50);
   LOCATE 7,1 : INPUT "             Enter your choice:", R$
   SELECT CASE R$
      CASE "Add", "Delete"
         LOCATE 10,1 : PRINT SPACE$(15);
         LOCATE 10,1 : PRINT R$;
      CASE "Quit"
         EXIT DO
      CASE ELSE
         LOCATE 10,1 : PRINT "Enter first word or press key."
   END SELECT
LOOP