ON

ON creates event procedure calls or enables event trapping.

• Set the sub-procedure call for KEY(n), STRIG(n) and TIMER(n)

• To turn on event trapping for ON KEY(n), ON STRIG(n) and ON TIMER(n).

• In the case of ON ERROR the trap is also enabled until a subsequent ON ERROR statement.
• ON procedures should be used only in the main program module and not inside of SUB procedures!
• If you have used the $CHECKING:OFF metacommand, $CHECKING:ON will turn on c++ error checking again.

See also

• ON...GOSUB, ON...GOTO
• OFF, STOP, KEY
• $CHECKING

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