In other words, your form will work if your HTML is exactly like this: <input type="checkbox" name="checkbox1" value="on">
Then value=pair in this case would be checkbox1=on (if checked obviously). I disagree that if not checked your $input{'checkbox1'} would be undefined. That would vary depdending on the query string parsing method. It may be null, but not necessarily undef. This might be a source for errors down the road.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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Snippets of code should be wrapped in
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