簡單的js日期三級聯動下拉程式碼
阿新 • • 發佈：2019-01-03
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>簡單js日期三級聯動下拉程式碼</title> </head> <body> <center><br><br><br><br> <form name="reg_testdate"> <select name="YYYY" onChange="YYYYDD(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> </center> <script language="JavaScript"> function YYYYMMDDstart(){ 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(); for (var i = (y-30); i < (y+30); i++) //以今年為準，前30年，後30年 document.reg_testdate.YYYY.options.add(new Option(" "+ i +" 年", i)); //賦月份的下拉框 for (var i = 1; i < 13; i++) document.reg_testdate.MM.options.add(new Option(" " + i + " 月", i)); document.reg_testdate.YYYY.value = y; document.reg_testdate.MM.value = new Date().getMonth() + 1; var n = MonHead[new Date().getMonth()]; if (new Date().getMonth() ==1 && IsPinYear(YYYYvalue)) n++; writeDay(n); //賦日期下拉框Author:meizz document.reg_testdate.DD.value = new Date().getDate(); } if(document.attachEvent) window.attachEvent("onload", YYYYMMDDstart); else window.addEventListener('load', YYYYMMDDstart, false); function YYYYDD(str) //年發生變化時日期發生變化(主要是判斷閏平年) { var MMvalue = document.reg_testdate.MM.options[document.reg_testdate.MM.selectedIndex].value; if (MMvalue == ""){ var e = document.reg_testdate.DD; optionsClear(e); 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.reg_testdate.YYYY.options[document.reg_testdate.YYYY.selectedIndex].value; if (YYYYvalue == ""){ var e = document.reg_testdate.DD; optionsClear(e); 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 e = document.reg_testdate.DD; optionsClear(e); for (var i=1; i<(n+1); i++) e.options.add(new Option(" "+ i + " 日", i)); } function IsPinYear(year)//判斷是否閏平年 { return(0 == year%4 && (year%100 !=0 || year%400 == 0)); } function optionsClear(e) { e.options.length = 1; } </script> </body> </html>