ON FKEY <integer> <action>
Integer is the value of FKEY referenced.
Action is GOTO <line-ref>, SYSTEM or IGNORE.
ON FKEY 11 GOTO MENU
See also On Error.
A few facts about ON FKEY.
- ON FKEY for each of 1-49 is set to ignore by default, as per System Defaults
- ON FKEY conditions are treated as error conditions and are checked for at the same time as Ctrl+A.
- If the system default for an FKEY (i.e. ignore) is overridden by an ON FKEY statement then when the FKEY interrupt is triggered, either by pressing the corresponding function key or some other method, then the specified ON action is performed.
- ON FKEY ## IGNORE can be specified to turn off special ON FKEY processing
Error 1 can be triggered by the pressing that fkey.
The following example demonstrates the use of ON FKEY. Keep in mind however, that when the operator presses an FKEY corresponding to ON FKEY, the program stops whatever it is doing and doesn't return, possibly losing data and other key information
00030 print fields "2,2,c 100": "At any time you may select F8 for main menu, F9 to print the screen, or F10 for the help menu." 00040 on fkey 8 goto MENU8 00050 on fkey 9 goto MENU9 00060 on fkey 10 goto MENU10 ... 03120 stop 03130 ! 03140 MENU8: chain MENU 03150 stop 03160 MENU9: printscreen 03170 stop 03180 MENU10: proc helpmenu