<select name="eyear">
<option value="">--年--</option>
<%for yy=2007 to 2050%>
<option value="<%=yy%>"><%=yy%></option>
<%next%>
</select><select name="emonth">
<option value="">-月-</option>
<%for mm=1 to 12%>
<option value="<%=mm%>" ><%=mm%></option>
<%next%>
</select>
<select name="eday">
<option value="">-日-</option>
<%for dd=1 to 31%>
<option value="<%=dd%>"><%=dd%></option>
<%next%>
</select>
<option value="">--年--</option>
<%for yy=2007 to 2050%>
<option value="<%=yy%>"><%=yy%></option>
<%next%>
</select><select name="emonth">
<option value="">-月-</option>
<%for mm=1 to 12%>
<option value="<%=mm%>" ><%=mm%></option>
<%next%>
</select>
<select name="eday">
<option value="">-日-</option>
<%for dd=1 to 31%>
<option value="<%=dd%>"><%=dd%></option>
<%next%>
</select>
<head>
<title>年月日三下拉框联动</title>
<meta http-equiv='Content-Type' content='text/html; charset=GBK'>
</head>
<body>
<form name=form1>
<select name=YYYY onchange="YYYYMM(this.value)">
<option value="">请选择 年</option>
</select>
<select name=MM onchange="MMDD(this.value)">
<option value="">选择 月</option>
</select>
<select name=DD>
<option value="">选择 日</option>
</select>
</form>
<script language="JavaScript"><!--
function window.onload()
{
strYYYY = document.form1.YYYY.outerHTML;
strMM = document.form1.MM.outerHTML;
strDD = document.form1.DD.outerHTML;
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();
var str = strYYYY.substring(0, strYYYY.length - 9);
for (var i = (y-30); i < (y+30); i++) //以今年为准,前30年,后30年
{
str += "<option value='" + i + "'> " + i + " 年" + "</option>\r\n";
}
document.form1.YYYY.outerHTML = str +"</select>";
//赋月份的下拉框
var str = strMM.substring(0, strMM.length - 9);
for (var i = 1; i < 13; i++)
{
str += "<option value='" + i + "'> " + i + " 月" + "</option>\r\n";
}
document.form1.MM.outerHTML = str +"</select>";
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); //赋日期下拉框
document.form1.DD.value = new Date().getDate();
}
function YYYYMM(str) //年发生变化时日期发生变化(主要是判断闰平年)
{
var MMvalue = document.form1.MM.options[document.form1.MM.selectedIndex].value;
if (MMvalue == ""){DD.outerHTML = strDD; return;}
var n = MonHead[MMvalue - 1];
if (MMvalue ==2 && IsPinYear(str)) n++;
writeDay(n)
}
function MMDD(str) //月发生变化时日期联动
{
var YYYYvalue = document.form1.YYYY.options[document.form1.YYYY.selectedIndex].value;
if (str == ""){DD.outerHTML = strDD; return;}
var n = MonHead[str - 1];
if (str ==2 && IsPinYear(YYYYvalue)) n++;
writeDay(n)
}
function writeDay(n) //据条件写日期的下拉框
{
var s = strDD.substring(0, strDD.length - 9);
for (var i=1; i<(n+1); i++)
s += "<option value='" + i + "'> " + i + " 日" + "</option>\r\n";
document.form1.DD.outerHTML = s +"</select>";
}
function IsPinYear(year)//判断是否闰平年
{ return(0 == year%4 && (year%100 !=0 || year%400 == 0))}
//--></script>
</body>
</html>
下面是我的函数
function daysInMonth(iMonth, iYear)
{
var days=0;
if(iMonth==2)
{
if (iYear%4==0 && (iYear%100 !=0 || iYear%400 == 0))
days = 29;
else
days = 28;
}
else
{
days = 32 - new Date(--iMonth, iMonth, 32).getDate();
}
return days;
}