Events

Online Express provides events at which to execute actions. Some events occur when the end user does things such as placing the cursor in an entry field. Other events occur at specific locations in the program. For any event, you can assign predefined actions, write and execute custom actions, or both. Writing custom actions at events occurring in the program lets you supplement or override the default program logic that Online Express generates. These events let you add logic at such program locations as:

• Upon program invocation
• Before sending the screen
• Before evaluating field actions
• Before and after moving records between the database and the screen
• Before transferring to another program
• Before terminating the program
• Other locations, depending on which actions you define for your program

In addition, you can add processing logic at events that occur before and after database calls.

Because the design and functionality of many programs differ, you will often see a different subset of events from program to program. To view the events in your program, you display the events for your fields or controls in the Action/Event Editor. In addition, you can look in your generated program source to see where the events occur; Online Express generates comments in your program to identify them.