2 ways, both use javascript (you can't do it with just cf):
1) add an onChange attribute to your select with
'this.form.submit()' as
value. this will submit the form, refresh the page and show
your results
- just as if user clicked your 'submit' button. be careful,
though, if
you are checking for existence of the submit button in your
action page
- it won;t be there since it has not been clicked.
2) you can also employ some ajax features to submit your form
asynchronously, 'behind the scenes', and show results without
refreshing
the page. CF8 has built-in ajax js functions and tags to do
it,
otherwise look into ajaxcfc by rob gonda or jQuery or other
js framework
that has these features.
hth
Azadi Saryev
Sabai-dee.com
http://www.sabai-dee.com/