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  Tutorial: ColdFusion Introduction to ColdFusion CFPARAM and How to Uncheck a Checkbox Tutorial

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 abou

Tutorial Details:

ColdFusion Introduction

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.
CFPARAM primary function is to provide a default value if one isn't provided from a requesting form, a URL, or from some other expected variable like a session ID. It also provides a nice way to check the passed values datatype which comes in handy when you need to assure that a numeric value, date or other datatype is passed.

Setting Defaults without CFPARAM
You can set a default without using CFPARAM by using something like:




 

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ColdFusion Introduction to ColdFusion CFPARAM and How to Uncheck a Checkbox Tutorial

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