Directives

ON...GOSUB/GOTO/EVENT

The ON directive has four formats: two that provide condition execution based on the value of a numeric expression, one that is used to define how to process EVENTS from OCX controls, and a fourth to define structured Error handling.

Formats

Use these links to access additional information for a specific format:

Format	Description
ON numexpr GOSUB stmtref,...	Jump to a subroutine value based on the value of a numeric expression.
ON numexpr GOTO stmtref,...	Transfer control to a statement value based on the value of a numeric expression.
ON EVENT...	Control the processing of events as received from external controls. COM, .NET and Browser controls are supported. See DEF OBJECT* directive. (.NET support was added in PxPlus 2025.)
ON PROCESS EVENT...	Define the logic to be executed when a PROCESS EVENT directive is executed. (The PROCESS EVENT directive was added in PxPlus v11.00.)
*... ON ERR directive(s)...*	Define Error logic for GOSUB, WHILE, FOR, REPEAT and SELECT directives.