年月日三下拉框联动
发布时间： 2012-09-10 11:02:32 作者： rapoo
年月日三下拉框联动
<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><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"><!--functionwindow.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vary = newDate().getFullYear();varstr = strYYYY.substring(0, strYYYY.length - 9);for(vari = (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varstr = strMM.substring(0, strMM.length - 9);for(vari = 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 = newDate().getMonth() + 1;varn = MonHead[newDate().getMonth()];if(newDate().getMonth() ==1 && IsPinYear(YYYYvalue)) n++;writeDay(n);//赋日期下拉框document.form1.DD.value = newDate().getDate();}functionYYYYMM(str) //年发生变化时日期发生变化(主要是判断闰平年){varMMvalue = document.form1.MM.options[document.form1.MM.selectedIndex].value;if(MMvalue == ""){DD.outerHTML = strDD; return;}varn = MonHead[MMvalue - 1];if(MMvalue ==2 && IsPinYear(str)) n++;writeDay(n)}functionMMDD(str) //月发生变化时日期联动{varYYYYvalue = document.form1.YYYY.options[document.form1.YYYY.selectedIndex].value;if(str == ""){DD.outerHTML = strDD; return;}varn = MonHead[str - 1];if(str ==2 && IsPinYear(YYYYvalue)) n++;writeDay(n)}functionwriteDay(n) //据条件写日期的下拉框{vars = strDD.substring(0, strDD.length - 9);for(vari=1; i<(n+1); i++)s += "<option value='" + i + "'> " + i + " 日" + "</option>\r\n";document.form1.DD.outerHTML = s +"</select>";}functionIsPinYear(year)//判断是否闰平年{return(0 == year%4 && (year0 !=0 || year%400 == 0))}//--></script><p>查找更多代码，请访问：<a href="http://www.lanrentuku.com"target="_blank">懒人图库</a></p></body></html>