Ways to Execute Javascript

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Here's what I'm doing:

I need to assign the value of a text box to a coldfusion variable.


Since javascript is how textbox values are accessed, what are the ways javascript can be executed?

These are the ones I know:

1) in an onclick, onload, etc. event

2) in <script></script> within the body


Here's what I need that these can't work for:

either:
<cfset x= some_javascript/javascript_function's_result>
OR
some javascript or javascript function's result as a URL variable


I'm grateful for any assistance you can give.

Thanks,
Eric