年月日三下拉框联动
来源:互联网 发布:理光扫描仪软件 编辑:程序博客网 时间:2024/04/29 16:55
- <html>
- <head>
- <title>年月日三下拉框联动</title>
- <meta http-equiv='Content-Type' content='text/html; charset=gb2312'>
- <meta name='author' content='F.R.Huang(meizz梅花雪)//www.meizz.com'>
- </head>
- <body>
- <form name=form1>
- <select name=YYYY onChange="YYYYDD(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 YYYYMMDDstart()
- {
- MonHead = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
- var y = new Date().getFullYear();
- for (var i = (y-30); i < (y+30); i++)
- document.form1.YYYY.options.add(new Option(" "+ i +" 年", i));
- for (var i = 1; i < 13; i++)
- document.form1.MM.options.add(new Option(" " + i + " 月", i));
- 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);
- document.form1.DD.value = new Date().getDate();
- }
- if(document.attachEvent)
- window.attachEvent("onload", YYYYMMDDstart);
- else
- window.addEventListener('load', YYYYMMDDstart, false);
- function YYYYDD(str)
- {
- var MMvalue = document.form1.MM.options[document.form1.MM.selectedIndex].value;
- if (MMvalue == ""){ var e = document.form1.DD; optionsClear(e); return;}
- var n = MonHead[MMvalue - 1];
- if (MMvalue ==2 && IsPinYear(str)) n++;
- writeDay(n)
- }
- function MMDD(str)
- {
- var YYYYvalue = document.form1.YYYY.options[document.form1.YYYY.selectedIndex].value;
- if (YYYYvalue == ""){ var e = document.form1.DD; optionsClear(e); return;}
- var n = MonHead[str - 1];
- if (str ==2 && IsPinYear(YYYYvalue)) n++;
- writeDay(n)
- }
- function writeDay(n)
- {
- var e = document.form1.DD; optionsClear(e);
- for (var i=1; i<(n+1); i++)
- e.options.add(new Option(" "+ i + " 日", i));
- }
- function IsPinYear(year)
- { return(0 == year%4 && (year%100 !=0 || year%400 == 0));}
- function optionsClear(e)
- {
- e.options.length = 1;
- }
- </body>
- </html>