ON Keyword - Different Uses
ON Keyword - Different Uses
The ON keyword is used in various statements to trap events:
Specifies a trap Type of event Enables the trap
◄ON COM(n)► events on communications port n ◄COM(n) ON►
◄ON KEY(n)► a keystroke on key n ◄KEY(n) ON►
◄ON PEN► lightpen events ◄PEN ON►
◄ON PLAY(n)► less than n notes in music buffer ◄PLAY ON►
◄ON STRIG(n)► events on joystick trigger n ◄STRIG(n) ON►
◄ON TIMER(n)► timer events ◄TIMER ON►
◄ON UEVENT► user-defined events ◄UEVENT ON►
Other uses of the ON keyword are:
◄ON ERROR► - to enable error handling and specify the error-handling routine
◄ON...GOSUB► - to branch to one of a list of subroutines
◄ON...GOTO► - to branch to one of a list of line labels