dynamically evaluate the names of fields generatedform

On submission of a form, I need to know if the check boxes exist and have values. The field names are generated dynamically and there could be many. Here is the code that I have been playing with. I am able to find out what it the field has a value if it exists, but I can't understand how to combine it with isDefined("") to test for existence of the field and avoid errors "I've not defined as a field."

< cfloop index = 'a' = '1' to = "#form.numRows #" >
< cfset thisname = ' form ' & #a # & "_Clear" >

<!-how to use isDefined("") at this stage in order to avoid a mistake on the next line when the field does not exist? ->

< cfset thisVal = Evaluate("form.#thisname#") >
< cfoutput > #thisname # #thisVal # < / cfoutput >
< / cfloop >

Thanks in advance for any help!

Logical, I will give that a shot. Thank you very much!

Tags: ColdFusion

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