add option to select combobox

To add option to select you can use :

     $('#selectname').append($("").attr("value", value).text(text));

If you need to append multi value you can user:

    $.each(data, function(i, option) {
        $('#selectname').append($('').attr("value", option.id).text(option.name));
    });

If you need to add option to first "top" of list use

     $('#sel_bat1').children(":first").before($("").attr("value", value).text(text));