hanya bisa 1 session

$(function(){

                            $.ajaxSetup({
                            type:"POST",
                            url: "<?php echo base_url('index.php/select/ambil_data') ?>",
                            cache: false,
                            });

                            $("#npm").change(function(){

                            var value=$(this).val();
                            //if(value>0){
                            $.ajax({
                            data:{modul:'ikhwan',id:value},
                            success: function(respond){
                            //$("#jumlah_pembayaran").html(respond);
                            //$("#jumlah_pembayaran").val(respond);
                                if(respond>0){
                                    var output2="Rp. " + parseInt(respond).toLocaleString();
                                    $.post("<?php echo site_url();?>/Super_admin/set_user_session",{'pembayaran':output2});
                                    $("#jumlah_pembayaran").attr("placeholder", output2);
                                    $("#save").removeAttr("disabled");
                                }
                                else{
                                    var output1="NPM salah!";
                                    $("#jumlah_pembayaran").attr("placeholder", output1);
                                    $("#save").a
                                    ttr("disabled");
                                }
                            }
                            })
                            //}

                            $.ajax({
                            data:{modul:'id_mhs',id:value},
                            success: function(respond){
                            //$("#jumlah_pembayaran").html(respond);
                            //$("#jumlah_pembayaran").val(respond);
                                if(respond>0){
                                    var output=parseInt(respond);
                                    $.post("<?php echo site_url();?>/Super_admin/set_user_session",{'id_mhs':output});
                                    //$("#id_mhs").attr("placeholder", output);
                                }
                                else{
                                    var output1="NPM salah!";
                                    //$("#id_mhs").attr("placeholder", output1);
                                }
                            }
                            })

                            });
                        })
//controllell
function set_user_session()
    {
        $this->session->set_flashdata('pembayaran', $_POST['pembayaran']);
        $this->session->set_flashdata('id_mhs', $_POST['id_mhs']);
    }