in reply to Re: How to handle multiple select in WWW::Mechanize?
in thread How to handle multiple select in WWW::Mechanize?

Thanks you :-) After googling for a while, I find http://coding.derkeiler.com/Archive/Perl/comp.lang.perl.misc/2005-07/msg00757.html helpful, I now using the following scheme to set multiple value for a <select> input, and it works well.
$mech->select("options", ['1', '3']);