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USING DREAMWEAVER

Building applications visually

Last updated 3/28/2012

Using ColdFusion components

About ColdFusion components

ColdFusion component (CFC) files let you encapsulate application and business logic into self-contained, reusable

units. CFCs also provide a fast, easy way to create web services.

A CFC is a reusable software unit written in ColdFusion markup language (CFML), which makes it easy to reuse and

maintain your code.

You can use Dreamweaver to work with CFCs. For information on CFC tags and syntax, see the ColdFusion

documentation from within Dreamweaver (Help

> Using ColdFusion).

Note: You can use CFCs only with ColdFusion MX or later. CFCs are not supported in ColdFusion 5.

CFCs are meant to provide a simple yet powerful way for developers to encapsulate elements of their websites.

Generally, you should use components for application or business logic. Use customs tags for presentation elements

such as customized greetings, dynamic menus, and so on.

As with many other types of construction, dynamic sites can often benefit from interchangeable parts. For example, a

dynamic site may run the same query repeatedly, or calculate the total price of shopping cart pages and recalculate it

every time an item is added. These tasks can be handled by components. You can fix, improve, extend, and even replace

a component with minimal impact to the rest of your application.

Suppose an online store calculates shipping charges based on the price of orders. For orders under $20, the shipping

charge is $4; for orders between $20 and $40, the shipping charge is $6, and so on. You could insert the logic for

calculating the shipping charge in both the shopping cart page and the checkout page, but that would mix HTML

presentation code and CFML logic code and generally make the code difficult to maintain and reuse.

You decide to create a CFC called Pricing that has, among other things, a function called ShippingCharge. The

function takes a price as an argument and returns a shipping charge. For example, if the value of the argument is 32.80,

the function returns 6.

In both the shopping cart page and the checkout page, you insert a special tag to invoke the ShippingCharge function.

When the page is requested, the function is invoked and a shipping charge is returned to the page.

Later, the store announces a special promotion: free shipping for all orders above $100. You make the change to the

shipping rates in one place—the

ShippingCharge function of the Pricing component—and all the pages using the

function automatically get accurate shipping charges.

Components panel overview (ColdFusion)

Use the Components panel (Window > Components) to view and edit ColdFusion components, and add code in the

page that invokes the function when the CFM page is requested.

Note: The Components panel is available only when viewing a ColdFusion page in Dreamweaver.

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