日期三级联动 转载
来源：http://www.wangchao.net.cn/bbsdetail_876.html<html> <head> <title>年月日三下拉框联动</title> <meta http-equiv='Content-Type' content='text/html; charset=gb2312'> </head> <body > <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 = ; //先给年下拉框赋内容 var y = new Date().getFullYear(); for (var i = (y-30); 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; if (new Date().getMonth() ==1 && IsPinYear(year.options.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.value; if (MMvalue == "" ){ var e = day; optionsClear(e); return;} var n = MonHead; 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.value; if (YYYYvalue == "" ){ var e = day; optionsClear(e); return;} var n = MonHead; 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); } //--></script> </body></html>
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