Writing maintainable code - Coldfusion tutorial

Category: Coldfusion tutorials > Development - Difficulty:

A ColdFusion variable is created by assigning a value to it. Most commonly, you create variables by using the CFSet tag. You can also use the CFParam tag and assignment statements in CFScript. Tags that create data objects also create variables.

ColdFusion expressions: operands, operators, and other constructs

Using ColdFusion variables

Macromedia's Chief Evangelist for ColdFusion, Ben Forta, spent the spring and early summer 2004 previewing the next generation of ColdFusion to user groups throughout North America. The pre-release name of the product is Blackstone and has a host of features that will be of interest to new and veteran ColdFusion and Flash programmers. Some of the major enhancements are: Wizards and enhancements for new CF'ers, major enhancement to CFFORM (key phrase: type = "flash"), introduction of CFDOCUMENT, and improved reporting with CFREPORT and a report creation tool.

For anyone new to application development, you may be perplexed when you create your form for editing some data that should allow a user to uncheck a checkbox and update a record to a status of not checked. You will sooner or later discover an oddity about HTML forms. HTML forms won't allow you to uncheck like you think you should be able to. If you uncheck the checkbox, the value becomes NULL and the form doesn't bother to pass the field. You will find that ColdFusion does have a simple solution and much more with the CFPARAM tag.