php - concat the two id came from database in ajax and codeigniter -


i having trouble in concating value of 2 id's database generate new id , use save again in database. using codeigniter , want technique/way concat better result or maybe faster. having problem, whenever there value in database, cannot increment id having +1. got output of 1-undefine-1

here ajax:

function getcheckupid() {  var init = 0; var value = $('#clinicid').html();    $.ajax ({     url: siteurl+"myclinic/getcheckid",     type: "get",     datatype: "json",     success: function(data) {         if(data.length>0) {           $('#checkid').text(value+"-"+data[0]['clinic_id']+1);           $("#checkid").css('visibility','visible');         }         else {           $('#checkid').text(value+"-"+init);           $("#checkid").css('visibility','visible');         }     }   })  }      function get_clinicid() {   $("#clinicid").empty();   $.ajax({         url: siteurl+"myclinic/get_clinicid",         type: "get",         datatype: "json",         success: function(data) {             $('#clinicid').text(data[0]['clinic_id']);         }   }); }

i check records in db using if(data.length>0) if got record, go data , +1 it. got value of undefined, if goes else, outputs bad, because whenever refresh it. outputs - 0, want 1-0. refresh again. how can concat safely ? issue in ajax ?. making slow ?

here controller :

public function getcheckid() {         $checkid = $this->clinic_model->checkupid();         echo json_encode($checkid);      }

my model :

public function checkupid() {         $query = $this->db->query('select tbl_check_up.check_up_id tbl_check_up');         return $query->result();     }


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