Lesson 7: Validating Data to Enforce Business Rules

In this lesson, you will create a page for the trip coordinator to add new trip offerings and update existing trips. In addition, you will add logic to validate that data entered so that it complies with Compass Travel business rules.

This lesson contains the following exercises:

Exercise 1: Using an HTML form to collect data
Exercise 2: Creating a simple action page
Exercise 3: About data validation
Exercise 4: Providing server-side validation
Exercise 5: Validating data on the client using ColdFusion form tags
Exercise 6: Dynamically populating the list of event types
Exercise 7: Validating the existence of the trip photo file

ColdFusion tags and functions introduced in this lesson

The following table describes the ColdFusion tags and functions that you use in this lesson to enhance the ColdFusion application:

Element	Type	Description
cfform	Tag	Builds a form with CFML custom control tags that provide more functionality than standard HTML form input elements.
cfinput	Tag	Use inside the `cfform` tag to place radio buttons, check boxes, or text boxes. Provides input validation for the specified control type.
cfselect	Tag	Use inside the `cfform` tag. Lets you construct a drop-down list form control. You can populate the drop-down list from a query, or use the HTML `option` tag. You also use `option` elements to populate lists. The syntax for the `option` tag is the same as for its HTML counterpart.
FileExists	Function	Returns True if the file specified in the argument exists, False if it doesn't exist.

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