年月日三級聯動選單
<html>
<head>
<title>年月日三下拉框聯動</title>
<meta http-equiv='Content-Type' content='text/html;
charset=gb2312'>
</head>
<body>
<form name=form1>
<select name=YYYY
onchange="YYYYMM(this.value)">
<option value="">請選擇
年</option>
</select>
<select name=MM
onchange="MMDD(this.value)">
<option value="">選擇
月</option>
</select>
<select name=DD>
<option value="">選擇
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];
//先給年下拉框賦內容
var y = new Date().getFullYear();
var str = strYYYY.substring(0, strYYYY.length - 9);
for (var i = (y-30); i < (y+30); i++)
//以今年為準，前30年，後30年
{
str += "<option value='" + i + "'> "
+ i + " 年" + "</option>\r\n";
}
document.form1.YYYY.outerHTML = str
+"</select>";
//賦月份的下拉框
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(y)) n++;
writeDay(n); //賦日期下拉框
document.form1.DD.value = new Date().getDate();
}
function YYYYMM(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 == ""){DD.outerHTML = strDD; return;}
var n = MonHead[MMvalue - 1];
if (MMvalue ==2 && IsPinYear(str))
n++;
writeDay(n)
}
function MMDD(str) //月發生變化時日期聯動
{
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) //據條件寫日期的下拉框
{
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)//判斷是否閏平年
{ return(0 == year%4 && (year%100
!=0 || year%400 == 0))}
//-->
</script>
</body>
</html>