How to append multiple values to a single parameter in html form?

Question

Assuming I have the following form:

 Oats


        

Answer 1

I was really only interested in checkboxes that were actually checked - so I built myfunc() from the other examples like this:

function myfunc(){
    $('#void input[type="checkbox"]').each(function(id,elem){
        if ( ! $(this).is(':checked') ) return;
        b = $("#res").val();
        if(b.length > 0){
            $("#res").val( b + ',' + $(this).val() );
        } else {
            $("#res").val( $(this).val() );
        }
    });
    var stuff = $("#res").val();
    if ( stuff.length < 1 ) {
        alert('Please select at least one');
    } else {
        $("#real").submit();
    }
}