基于javascript bootstrap实现生日日期联动选择

<div class="col-sm-9">
     <label class="checkbox-inline">
      <select node-type="birthday_year" name="birthday_y" id="birthday_y">
      <option value=""></option>
 
      </select><span>年</span>
     </label>
     <label class="checkbox-inline">
      <select node-type="birthday_month" name="birthday_m" id="birthday_m">
      <option value=""></option>
 
      </select><span>月</span>
     </label>
     <label class="checkbox-inline">
      <select node-type="birthday_month" name="birthday_d" id="birthday_d">
      <option value=""></option>
 
      </select><span>日</span>
     </label>
     <input type="hidden" name="birth" id="birth" value="2016/2/12">
     <label class='checkbox-inline text-warning hidden' id="birth_error_info"><i class='fa fa-warning'>请输入完整生日</i></label>
     </div>

//设置生日的转换和获取
 
 
 var date=new Date();
 var year=date.getFullYear();
 for(var i=year;i>=1900;i--){
 $("#birthday_y").append("<option value="+i+" label="+i+">"+i+"</option>");
 }
 
 
 
 
 $('#birthday_y').change(function(){
 var birth_year=$('#birthday_y').val();
 if(birth_year!=""){
  var birth_month=$('#birthday_m').val();
  if(birth_month!=""){
  if(birth_month=="2"){
   if((birth_year%4==0 && birth_year%100!=0) || (birth_year%400==0)){
   $("#birthday_d").append("<option value=" + 29 + " label=" + 29 + ">" + 29 + "</option>");
   }else{
   $("#birthday_d option[value='29']").remove();
   }
  }
  }else {
  for (var i = 1; i <= 12; i++) {
   $("#birthday_m").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
  }
  }
 }else{
  $("#birthday_m").html("<option value=''></option>");
  $("#birthday_d").html("<option value=''></option>");
 }
 checkBirthday();
 });
 $('#birthday_m').change(function(){
 var birth_year=$('#birthday_y').val();
 var birth_month=this.value;
 var birth_day=$('#birthday_d').val();
 if(birth_month!=""){
  switch (birth_month){
  case "1":case "3":case "5":case "7":case "8":case "10":case "12":
  if(birth_day=="") {
   $("#birthday_d").empty();
   $("#birthday_d").append("<option value='' ></option>");
   for (var i = 1; i <= 31; i++) {
   $("#birthday_d").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
   }
  }else {
   switch ($("#birthday_d option:last").attr("value")){
   case "28":$("#birthday_d").append("<option value=" + 29 + " >" + 29 + "</option>");
   case "29":$("#birthday_d").append("<option value=" + 30 + " >" + 30 + "</option>");
    $("#birthday_d").append("<option value=" + 31 + " >" + 31 + "</option>");break;
   case "30":$("#birthday_d").append("<option value=" + 31 + " >" + 31 + "</option>");
    break;
   default :break;
 
   }
  }
  break;
  case "4":case "6":case "9": case "11":
  if(birth_day=="") {
   $("#birthday_d").empty();
   $("#birthday_d").append("<option value='' ></option>");
   for (var i = 1; i <= 30; i++) {
   $("#birthday_d").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
   }
  }else{
   switch ($("#birthday_d option:last").attr("value")){
   case "28":$("#birthday_d").append("<option value=" + 29 + " >" + 29 + "</option>");
   case "29":$("#birthday_d").append("<option value=" + 30 + " >" + 30 + "</option>");
   case "31":$("#birthday_d option[value='31']").remove();
    break;
   default :break;
 
   }
  }
  break;
  case "2":
   if(birth_day==""){
   if((birth_year%4==0 && birth_year%100!=0) || (birth_year%400==0)){
    for(var i=1;i<=29;i++){
    $("#birthday_d").append("<option value="+i+" label="+i+">"+i+"</option>");
    }
   }else{
    for(var i=1;i<=28;i++){
    $("#birthday_d").append("<option value="+i+" label="+i+">"+i+"</option>");
    }
   }}else{
   $("#birthday_d option[value='31']").remove();
   $("#birthday_d option[value='30']").remove();
   if((birth_year%4==0 && birth_year%100!=0) || (birth_year%400==0)){
 
   }else{
    $("#birthday_d option[value='29']").remove();
   }
   }
   break;
  default :break;
  }
 
 
 }
 checkBirthday();
 });
 
 $('#birthday_d').change(function() {
  checkBirthday();
 }
 );
 $('#birthday_d').focus(
 function(){
  if($('#birthday_m').val()==""){
  $("#birthday_d").empty();
  $("#birthday_d").append("<option value='' ></option>");
  }
 }
 );
 
 //根据后台提供的数据，填充用户的值
 var birth_value=$('#birth').val();
 if(birth_value!="") {
 var date1 = new Date(birth_value);
 var b_year=date1.getFullYear();
 var b_month=date1.getMonth()+1;
 var b_day=date1.getDate();
 $("#birthday_y").find("option[value='"+b_year+"']").attr("selected","selected");
 if($('#birthday_y').val()!="") {
  for (var i = 1; i <= 12; i++) {
  $("#birthday_m").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
  }
 }
 $("#birthday_m").find("option[value='"+b_month+"']").attr("selected","selected");
 switch (b_month){
  case 1:case 3:case 5:case 7:case 8:case 10:case 12:
  for (var i = 1; i <= 31; i++) {
  $("#birthday_d").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
  }
  break;
  case 4:case 6:case 9: case 11:
 
  $("#birthday_d").append("<option value='' ></option>");
  for (var i = 1; i <= 30; i++) {
  $("#birthday_d").append("<option value=" + i + " label=" + i + ">" + i + "</option>");
  }
  break;
  case 2:
  if((b_year%4==0 && b_year%100!=0) || (b_year%400==0)){
   for(var i=1;i<=29;i++){
   $("#birthday_d").append("<option value="+i+" label="+i+">"+i+"</option>");
   }
  }else{
   for(var i=1;i<=28;i++){
   $("#birthday_d").append("<option value="+i+" label="+i+">"+i+"</option>");
   }
  }
  break;
  default :break;
 }
 $("#birthday_d").find("option[value='"+b_day+"']").attr("selected","selected");
 }
 
//验证生日是否输入完整
 function checkBirthday(){
 var b_year= $('#birthday_y').val();
 var b_month=$('#birthday_m').val();
 var b_day=$('#birthday_d').val();
 if(b_year!=""&&b_month!=""&&b_day!=""){
  $('#birth').val(b_year+"-"+b_month+"-"+b_day);
  $('#birth_error_info').addClass("hidden");
 }else{
  $('#birth').val("");
  $('#birth_error_info').removeClass("hidden");
 }
 }