QBasic 1.1: ON Keyword

Description / Parameter(s)

Performs different actions as part of several statements:
  • Enables error trapping when used with the ON ERROR statement.
  • Enables event trapping when used with the event ON statements (COM ON, KEY ON, PEN ON, PLAY ON, STRIG ON, and TIMER ON).
  • Specifies an event to trap when used with the ON event statements (ON COM, ON KEY, ON PEN, ON PLAY, ON STRING, and ON TIMER).
  • Specifies an expression to evaluate when used with the ON...GOSUB and ON...GOTO statements.