<html>
<head>
<script language="JavaScript"><!--
function YYYYMMDDstart()
{
MonHead = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
//先給年下拉框賦内容
var y = new Date().getFullYear();
for (var i = (y-60); i < y+1; i++)
{
document.form1.YYYY.options.add(new Option(" "+ i +" 年", i));
}
//賦月份的下拉框
for (var i = 1; i < 13; i++)
document.form1.MM.options.add(new Option(" " + i + " 月", i));
document.form1.YYYY.value = y;
document.form1.MM.value = new Date().getMonth() + 1;
var n = MonHead[new Date().getMonth()];
if (new Date().getMonth() ==1 && IsPinYear(YYYYvalue)) n++;
writeDay(n); //賦日期下拉框Author:meizz
document.form1.DD.value = new Date().getDate();
}
window.attachEvent("onload", YYYYMMDDstart);
function YYYYDD(str) //年發生變化時日期發生變化(主要是判斷閏平年)
{
var MMvalue = document.form1.MM.options[document.form1.MM.selectedIndex].value;
if (MMvalue == ""){ var e = document.form1.DD; optionsClear(e); return;}
var n = MonHead[MMvalue - 1];
if (MMvalue ==2 && IsPinYear(str)) n++;
writeDay(n)
}
function MMDD(str) //月發生變化時日期關聯
{
var YYYYvalue = document.form1.YYYY.options[document.form1.YYYY.selectedIndex].value;
if (YYYYvalue == ""){ var e = document.form1.DD; optionsClear(e); return;}
var n = MonHead[str - 1];
if (str ==2 && IsPinYear(YYYYvalue)) n++;
writeDay(n)
}
function writeDay(n) //據條件寫日期的下拉框
{
var e = document.form1.DD; optionsClear(e);
for (var i=1; i<(n+1); i++)
e.options.add(new Option(" "+ i + " 日", i));
}
function IsPinYear(year)//判斷是否閏平年
{ return(0 == year%4 && (year%100 !=0 || year%400 == 0));}
function optionsClear(e)
{
e.options.length = 1;
}
function showBirthday()
{
document.form1.HiddenYear.value=document.form1.YYYY.value+"-"+document.form1.MM.value+"-"+document.form1.DD.value;
}
//--></script>
</HEAD>
<body>
<form name=form1 method="post">
<select name="YYYY" οnchange="YYYYDD(this.value);"><option>選擇年</option>
<select name="MM" οnchange="MMDD(this.value)"><option>選擇月</option>
<select name="DD"><option>選擇日</option>
</form>
</body>
</html>
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