出生日期三級聯動下拉選單

神馬和浮雲發表於2013-08-14
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標題文件</title>
</head>
<script language="javascript" >
function YearMonthDay(){
   fo=document.form1;
   foday=fo.day;
   MonHead=[31,28,31,30,31,30,31,31,30,31,30,31];
 
   //設定年
   y=new Date().getFullYear();
   start_y = y-90;        //開始年份
   end_y = y-10;        //結束年份
   for(i=start_y;i<=end_y;i++)
   fo.year.options.add(new Option(i,i));
   fo.year.options.value=y;//current year
 
    //設定月
   m=new Date().getMonth();
   for(i=1;i<=12;i++)
   fo.month.options.add(new Option(i,i));
   fo.month.options.value=m+1;//current month
 
   //設定日
   d=new Date().getDay();
   n=MonHead[m];
   if(m==1&&IsRunYear(yearValue))
   n++;
   day(n);
   fo.day.options.value=d+1;//curren day
}
   //onchange of year
function yy(str){
   monthValue=fo.month.options[fo.month.selectedIndex].value;
   if(monthValue==""){
      var foday=document.form1.day;
   optionClear(foday);
   return;
    }
   var n=MonHead[monthValue-1];
   if(monthValue==2&&IsRunYear(str)) n++;
   day(n);
}
   //onchange of month
function mm(ab){
  yearValue=fo.year.options[fo.year.selectedIndex].value;
 if(yearValue==""){
  optionClear(foday);
  return;
 }
 var n=MonHead[ab-1];
 if(ab==2&&IsRunYear(yearValue)) n++;
 day(n);
}
 
function day(ab){
   optionClear(foday);
   for(var i=1;i<=ab;i++)
   foday.options.add(new Option(i,i));
 }
 
function optionClear(ab){
   for(var i=ab.options.length;i>0;i--)
   ab.remove(i);
}
function  IsRunYear(year){
   return(0==year%4 && (year!=0 || year==0));
}
</script>

<body onload="YearMonthDay()">


 在body中輸入onload事件onload="YearMonthDay()"
<form name="form1">
  <select name="year" onchange="yy(this.value)">
    <option   value=""></option>
  </select>年
  <select name="month" onchange="mm(this.value)">
    <option   value=""></option>
  </select>月
  <select name="day">
    <option   value=""></option>
  </select>日
</form>

</body>
</html>

 

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