php - how show notification information -

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how show notification "npm kosong" if have 3 condition on model. , how make on controller show notification.

case 1: if condition cek_npm empty = notif "npm empty. check again!"
case 2: if condition cek_npm not empty = notif "npm success absent"
case 3: if condition npm_mhs , kode_absensi not empty = notif "npm have been absent" , sorry english bad.

my model

public function cek_npm($arr){     $arr['npm_mhs']       = $this->input->post('npm_mhs');      $datenow=date("y-m-d");     date_default_timezone_set('asia/jakarta');     //$now = date("h:i:s");     $jam_masuk_absensi="";      $query=$this->db->query("select npm_mhs tbl_mahasiswa npm_mhs= '" . $arr['npm_mhs'] . "'");     if($query->num_rows()==0){          $this->session->set_flashdata('info', 'npm tidak ditemukkan ');         //return $query->num_rows();         return null;     }         $query1=$this->db->query("select kode_absensi tbl_absensi npm_mhs='" . $arr['npm_mhs'] . "' , tgl_absensi='$datenow'");      if($query1->num_rows()>0)     {         return false;     }      else{         $data=array(              'npm_mhs'=>$arr['npm_mhs'],              'kode_absensi'=>'1',              'jam_masuk_absensi'=>date('h:i:s'),              'tgl_absensi'=>$datenow             );         $this->db->insert('tbl_absensi',$data);         return true;     }    }

my controller:

public function insert_absensi() {     $arr['npm_mhs']       = trim($this->input->post('npm_mhs'));       if($this->absensi_model->cek_npm($arr['npm_mhs']) == true){          $this->session->set_flashdata('info', 'npm ditemukan sukses absen ');       }     else{          $this->session->set_flashdata('info', 'npm sudah absen');         }     if($this->absensi_model->cek_npm($arr['npm_mhs']) == null)      $this->session->set_flashdata('error', 'npm kosong');     }

my view:

$(document).ready(function () {       $("#form").validate({         submithandler: function (form) {                 $.post("<?php echo base_url(); ?>absensi_c/insert_absensi", {                     npm_mhs: $('#npm_mhs').val(),                     },                 function (data) {                     window.location = "<?php echo base_url(); ?>absensi_c";                     //$('#loadpage').html(data);                 });           }     });  });  function batal() {     window.location = "<?php echo base_url(); ?>absensi_c"; }


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