앱)select box 선택시에 팝업이 뜨는 로직정리

<c:choose>
   <c:when test="">
        <select id="selStatusCd${lineIndex.index}" onchange="changeStatusCode('${id}', '${status}', 'selStatusCd${lineIndex.index}');" onfocus="beforeStatusCode(this);">
          <option value="">${statuscode}</option>
          <option value="R" <c:if test="${statusCode == 'R'}">selected="selected"</c:if>>Ready</option>
   </select>
   </c:when>
   </c:choose>



var changeParams, beforeValue, beforeSelId;

function beforeStatusCode(obj){
    beforeValue = obj.value;
}

function unchangedStatusCode() {
      $("#"+beforeSelId).val(beforeValue);
}

function changeStatusCode(id, previousStatus, selId){
    changeParams = {
              'id' : id,
              'previousStatus' : previousStatus,
               'statusCode' : $("#"+selId).val()
     };

   beforeSelId = selId;
   var msg = 'Do you confirm to chage the [' + id + '] status ?';
  $('#messageValue1").text(msg);
  $.dimPopup.init();
  $.dimPopup.layerOpen("#confirm_popup);
}


function doChnageStatusCode() {
$.ajax({
url : "<c:url value='/xxx.do' />",
type: 'post',
data : changeParams,
beforeSend : function(xhr) {
      xhr.setRequestHeader("AJAX", "true");
 },
contentType: "application/x-www-form-urlencoded; charset=UTF-8",
success : function(data){
       if(data == "ERROR"){
       }else{
       }
},
error:function(xhr, status, error){
   if(xhr.status == 403){
         location.href="<c:url value="/login/intro.do' />";
}


@RequestMapping(value="xxx", method = RequestMethod.POST)
@ResponseBody
public String xxxx(HttpServletRequest request, HttpServletResponse response, @ModelAttribute xxxVO vo){

result="SUCCESS" or result="ERROR"

return result;