thanks for your reply ,but the unquoted select1 select2 will generate syntax error

That's not true! Quoting of identifiers followed by "=>" is optional. See perlop and perldata. 

use strict;
use warnings;

use Data::Dumper qw( Dumper );

print Dumper
     [ select1 => 'Component_1_1',
       select1 => 'Component_1_2',
       select2 => 'Component_2_3',
     ];

[download]
>perl 710263.pl
$VAR1 = [
          'select1',
          'Component_1_1',
          'select1',
          'Component_1_2',
          'select2',
          'Component_2_3'
        ];

[download]

Note that ontologies[] is not an identifier, so you will have to quote that.

it still doesn't work

You've misspelled "All". If you still have problems after fixing that one, perhaps the server is expecting other fields you didn't show us or some cookies.

In reply to Re^3: how to post multiple select list through LWP::agent by ikegami
in thread how to post multiple select list through LWP::agent by NPhard

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