The Customer List Module

The custlist.4gl module defines a 'zoom' module, to let the user select a customer from a list. The module could be reused for any application that requires the user to select a customer from a list.

This module uses the custlist.per form and is typical list handling using the DISPLAY ARRAY statement, as discussed in Chapter 07. The display_custlist() function in this module returns the customer id and the name. See the custlist.4gl source module for more details.

In the application illustrated in this chapter, the main module orders.4gl will call the display_custlist() function to retrieve a customer selected by the user.

01   ON ACTION zoom1
02     CALL display_custlist() RETURNING id, name 
03     IF (id > 0) THEN
04         ...