日期:2014-05-16 浏览次数:20378 次
<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="">年</option> </select> <select name=MM onchange="MMDD(this.value)"> <option value="">月</option> </select> <select name=DD> <option value="">日</option> </select> </form> <script language="JavaScript"> window.onload = function(){ 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 + "</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 + "</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 + "</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>