ON: Difference between revisions

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* Set the sub-procedure call for [[KEY(n)]], [[STRIG(n)]] and [[TIMER]]
* Set the sub-procedure call for [[KEY(n)]], [[STRIG(n)]] and [[TIMER]]


* To turn on event trapping for [[ON KEY (n)]], [[ON STRIG (n)]] and [[ON 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.
* In the case of [[ON ERROR]] the trap is also enabled until a subsequent ON ERROR statement.
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''See also:''  
''See also:''


[[ON...GOSUB]], [[ON...GOTO]]  
[[ON...GOSUB]], [[ON...GOTO]]


[[OFF]], [[STOP]], [[KEY]]
[[OFF]], [[STOP]], [[KEY]]

Revision as of 02:12, 23 January 2023

ON creates event procedure calls or enables event trapping.


  • 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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