The dropdown selector uses javascript to reload the page. It's dorky:

<select id="_size" name="size" onchange="var s=sURL + '&size=' + this.value; document.location.href=s"><option value="all">All</option><option value="50">50</option><option value="100">100</option></select>

We can simulate this by adding an "&size=all" to the url. We'll do this by setting an extra field entry:

$browser->field( 'size', 'all' );
[download]

Example:

#!env perl
use strict;
use warnings;
use autodie qw/ open close /;
use 5.012;
use WWW::Mechanize;

# create WWW::Mechanize object
# autocheck 1 checks each request to ensure it was successful
my $browser = WWW::Mechanize->new( autocheck => [1] );

# retrieve page
$browser->get('http://www.ncbi.nlm.nih.gov/Traces/wgs/');

#select form to fill based on mech-dump output
$browser->form_number(1);

# fill field 'term' with name of species
$browser->field( 'term', 'Escherichia' );
$browser->field( 'size', 'all' );


# click apply button
$browser->submit('Apply');

my $url = $browser->uri;
print "url: $url\n";

# launch browser to test url
#system( 'firefox', $url );
print $browser->content();
[download]

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