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Cold
Fusion doesn't like values to not exist. Enter
a very handy tag called CFPARAM.
Consider
the CheckBox in a form. It can only pass a checked value.
What if the user doesn't want it checked? Cold Fusion won't
like that. It requires an 'unchecked' value too!
CFPARAM
looks like:
<CFPARAM
NAME="Parameter Name" Default="default value">
What
CFPARAM says to Cold Fusion is 'If a value for 'Parameter
Name' doesn't exist, use the Default one here'.
We've
set the checked value of the CheckBox to 'box was checked'.
CFPARAM on the following page will set the unchecked default
value.
Submit
the form without checking the box.
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