missing leading zero id from db using ajax

inside mysql db which is table employe in coloumn id_employee, some data have a leading zero, etc :
id_employee : 0378192918
empy_name : Daniweb

i need to get id_employee for delete employe in my aplication, then i using ajax method like this :

if(id) {
      alert(id);
      $("#deleteBtn").unbind('click').bind('click',function(){
         $.ajax({
            url: 'pegawai/delpeg.php',
            type:'post',
            data: {emp_id : id},
            datatype: 'json',
            success:function(response) {

return value is 378192918, the first number 0 not showing in alert box. why ? then how to get entire value id_employe from db ?