<html>
<head>
<title>年月日三下拉框联动</title>
<meta http-equiv='Content-Type' content='text/html; charset=gb2312'>
<meta name='author' content='F.R.Huang(meizz梅花雨)//www.meizz.com'>
</head>
<body onload="YYYYMMDDstart(document.form1,document.form1.SYear,document.form1.SMonth,document.form1.SDay),YYYYMMDDstart(document.form1,document.form1.EYear,document.form1.EMonth,document.form1.EDay)">
<form name=form1>
起始时间：
<select name=SYear onchange="YYYYDD(this.value,document.form1.SMonth,document.form1.SDay)">
<option value="">年</option>
</select>年
<select name=SMonth onchange="MMDD(this.value,document.form1.SYear,document.form1.SDay)">
<option value="">月</option>
</select>月
<select name=SDay>
<option value="">日</option>
</select>日<br><br>
完成时间：
<select name=EYear onchange="YYYYDD(this.value,document.form1.EMonth,document.form1.EDay)">
<option value="">年</option>
</select>年
<select name=EMonth onchange="MMDD(this.value,document.form1.EYear,document.form1.EDay)">
<option value="">月</option>
</select>月
<select name=EDay>
<option value="">日</option>
</select>日
</form>
<script language="JavaScript"><!--
function YYYYMMDDstart(form,year,month,day)
{
MonHead = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
//先给年下拉框赋内容
var y = new Date().getFullYear();
for (var i = (y-3); i < (y+5); i++) //以今年为准，前30年，后30年
year.options.add(new Option(i,i));
//赋月份的下拉框
for (var i = 1; i < 13; i++)
month.options.add(new Option(i,i));
year.value = y;
month.value = new Date().getMonth() + 1;
var n = MonHead[new Date().getMonth()];
if (new Date().getMonth() ==1 && IsPinYear(year.options[year.selectedIndex].value)) n++;
writeDay(n,day); //赋日期下拉框Author:meizz
day.value = new Date().getDate();
}
function YYYYDD(str,month,day) //年发生变化时日期发生变化(主要是判断闰平年)
{
var MMvalue = month.options[month.selectedIndex].value;
if (MMvalue == "" ){ var e = day; optionsClear(e); return;}
var n = MonHead[MMvalue - 1];
if (MMvalue ==2 && IsPinYear(str)) n++;
writeDay(n,day)
}
function MMDD(str,year,day) //月发生变化时日期联动
{
var YYYYvalue = year.options[year.selectedIndex].value;
if (YYYYvalue == "" ){ var e = day; optionsClear(e); return;}
var n = MonHead[str - 1];
if (str ==2 && IsPinYear(YYYYvalue)) n++;
writeDay(n,day)
}
function writeDay(n,day) //据条件写日期的下拉框
{
var e = day; optionsClear(e);
for (var i=1; i<(n+1); i++)
e.options.add(new Option(i,i));
}
function IsPinYear(year)//判断是否闰平年
{ return(0 == year%4 && (year%100 !=0 || year%400 == 0));}
function optionsClear(e)
{
for (var i=e.options.length; i>0; i--)
e.remove(i);
}
function compDate(SY,SM,SD,EY,EM,ED)
{
}
//--></script>
</body>
</html>
