Hi,
Default value for a checkbox is 'on' and 'off' .
So, you can simply try
mechanize->submit_form(form_name => 'environment_modify',
fields => {
'envi
+ronment_modify_add_host_essential_1' => 'on',
},
);
"environment_modify_add_host_essential_1" is the checkbox and it is initially in 'off' state. When you turn it on it will be ticked.
Thanks,
Raja.