A common method of requesting help from an application is by selecting help items from the application menu bar. The menu bar usually includes a help pull-down menu and contains menu items, such as:
Help Topics — Instruct the help engine to display the HTML Help Viewer for the specified help file
About or Version — Provide application copyright and version number information
The CHOOSE event occurs when a user chooses an option from a menu. In ABL, you use a CHOOSE event to code a trigger for menu items.
The following code example demonstrates a help trigger that executes when the user selects a menu item from the application's menu bar to access the help engine:
ON CHOOSE OF MENU-ITEM menu_help_contents DO:
SYSTEM-HELP myhelp.chm CONTENTS.
END.
Help Topics — Instruct the help engine to display the HTML Help Viewer for the specified help file
