ajax

$.ajax({
                url:"{:url(‘user‘)}",
                data:{"group_id":data.value},
                type:‘post‘,
                dataType:‘json‘,
                success:function (res) {
                    console.log(res);
                    for(var i=0;i<res.length;i++){
                        $("#sel3").append("<option value=\""+res[i].id+"\">"+res[i].nickname+"</option>");
                    }
                    form.render();
                }
            });