Do checkbox inputs only post data if they're checked?

Question

Is it standard behaviour for browsers to only send the checkbox input value data if it is checked upon form submission?

And if no value data is supplied, is the defa

Answer 1

Checkboxes are posting value 'on' if and only if the checkbox is checked. Insted of catching checkbox value you can use hidden inputs

JS:

var chk = $('input[type="checkbox"]');
    chk.each(function(){
        var v = $(this).attr('checked') == 'checked'?1:0;
        $(this).after('');
    });

chk.change(function(){ 
        var v = $(this).is(':checked')?1:0;
        $(this).next('input[type="hidden"]').val(v);
    });

HTML:

Active