ตัวอย่าง jQuery loadSelectBox

function loadSelectBox(id,url,selected){
 $.get(
  url,{},function(data){
   $(id).html(data);
   if (selected!=''){
    $(id+' option[value='+selected+']').attr('selected','selected');
   }
   $("#loading_img").hide();
  }
 );
}

 //ดึง Staff มาแสดง
 $("#roleid_").on('change', function() {
 if($("#roleid_").val()!= ""){
  $("#loading_img").show();
  var userid = '';
  loadSelectBox(
    '#userid',
    'index.php?module=AppDashboard&action=getStaffPopup&roleid_='+$("#roleid_").val(),
    userid
  ); 
 }
 });
 

  var userid = '';
  loadSelectBox(
    '#userid',
    'index.php?module=AppDashboard&action=getStaffPopup&roleid_='+$("#roleid_").val(),
    userid
  );