Programming instructions

100 Lesson 4 Validating Data to Enforce Business Rules
Enhancing the Trip Maintenance application
In this lesson and the next, you will create the code to implement the remaining
maintenance buttons on the main Trip Maintenance application page. The remaining
buttons are Add and Edit.
You will develop the data entry form to capture new trip information and validate the
data entered against Compass Travel business rules. You will then modify the data entry
form to edit existing trips. In the next lesson, you will continue to build on this
application by adding logic to insert and update the data to the Compass Travel database.
The following list identifies the trip edit components that you will create in this lesson.
• Trip Edit page You will create the Trip Edit page (see the following figure) bto add
new trips and edit existing trips. The page will be launched from the Add and Edit
buttons on the main Trip Maintenance application page (tripdetail.cfm). The fields
required to capture trip information are the same as those on the Trip Detail page
that you used to display trip information in Lesson 3.
• Trip Edit Action page You will develop an action page that will insert or update
trip data passed from the Trip Edit page into the trips table of the Compass Travel
database. In this lesson you will only add the logic to validate the data entered on the
Trip Edit page.