JavaScript日期选择功能示例

本文主要是介绍JavaScript日期选择功能示例，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

本文实例讲述了JavaScript日期选择功能。分享给大家供大家参考，具体如下：

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <meta charset="utf-8">
  <title>javascript日期选择</title>
  <style type="text/css">
    option{
      width:150px;
    }
  </style>
</head>
<body>
<!--<input type="hidden" value="window.location.href" />-->
<br />
<div id="dateOp">
  <select id="selectYear" onchange="getDay()"></select>年
  <select id="selectMonth" onchange="getDay()"></select>月
  <select id="selectDay"></select>日
  <input type="button" value="getdate" />
</div>
<script type="text/javascript">
  //或得当前年月日
  var date = new Date();
  var year = date.getFullYear();
  var month = date.getMonth() + 1;
  var day = date.getDate();
  var startYear = 2000;
  var endYear = 2050;
  var button = document.getElementsByTagName("input")[0];
  //得到三个select项
  var selectYearElement = document.getElementById("selectYear");
  var selectMonthElement = document.getElementById("selectMonth");
  var selectDayElement = document.getElementById("selectDay");
  //selectYearElement.onchange = getDay();
  //selectMonthElement.onchange = getDay();
  //selectYearElement.addEventListener
  getYear();
  getMonth();
  getDay();
  //年份函数
  function getYear() {
    for (var i = startYear; i <= endYear; i++) {
      var opYearElement = document.createElement("option");
      var textElement = document.createTextNode(i);
      opYearElement.appendChild(textElement);
      opYearElement.value = i;
      selectYearElement.appendChild(opYearElement);
    }
//设置默认年份的值
    selectYearElement.selectedIndex = year - startYear;
  }
  //月份函数
  function getMonth() {
    for (var i = 1; i <= 12; i++) {
      var opMonthElement = document.createElement("option");
      textMonth = document.createTextNode(i);
      opMonthElement.appendChild(textMonth);
      opMonthElement.value = i;
      selectMonthElement.appendChild(opMonthElement);
    }
//设置默认年份的值
    selectMonthElement.selectedIndex = month - 1;
  }
  //日期函数
  function getDay() {
    var getSelectedYear = selectYearElement.selectedIndex + startYear;
    var getSelectedMonth = selectMonthElement.selectedIndex + 1;
    var flag = 0;
    var selectDayElement = document.getElementById("selectDay");
    if (selectDayElement.hasChildNodes()) {
      var optionElements = selectDayElement.getElementsByTagName("option");
      for (var i = 0; i < optionElements.length; i++) {
        selectDayElement.removeChild(optionElements[0]);
//不知道为什么必须得自减一
        i--;
      }
    }
    else {
    }
//得到闰年
    if ((getSelectedYear % 4 == 0 && getSelectedYear % 100 != 0) || getSelectedYear % 400 == 0) {//得到闰年的年号
//alert("闰年");
//得到闰年大月份除二月以外
      if ((getSelectedMonth <= 7 && getSelectedMonth % 2 == 1 && getSelectedMonth != 2) || (getSelectedMonth >= 8 && getSelectedMonth % 2 == 0)) {//得到大月
        setDay(flag = 31);
      }
      else if (getSelectedMonth <= 7 && getSelectedMonth == 2) {
        setDay(flag = 29);
      }
      else if ((getSelectedMonth <= 7 && getSelectedMonth % 2 == 0 && getSelectedMonth != 2) || (getSelectedMonth >= 8 && getSelectedMonth % 2 == 1)) {//得到小月份除二月以外
        setDay(flag = 30);
      }
    }
//非闰年
    else {
//alert("平年");
//得到平年大月份除二月以外
      if ((getSelectedMonth <= 7 && getSelectedMonth % 2 == 1 && getSelectedMonth != 2) || (getSelectedMonth >= 8 && getSelectedMonth % 2 == 0)) {//得到大月
        setDay(flag = 31);
      }
      else if (getSelectedMonth <= 7 && getSelectedMonth == 2) {
        setDay(flag = 28);
      }
      else if ((getSelectedMonth <= 7 && getSelectedMonth % 2 == 0 && getSelectedMonth != 2) || (getSelectedMonth >= 8 && getSelectedMonth % 2 == 1)) {//得到小月份除二月以外
        setDay(flag = 30);
      }
    }
  }
  //设置默认年份的值
  selectDayElement.selectedIndex = day - 1;
  function setDay(dayLength) {
    for (var i = 1; i <= dayLength; i++) {
      var opDayElement = document.createElement("option");
      textMonth = document.createTextNode(i);
      opDayElement.appendChild(textMonth);
      opDayElement.value = i;
//alert(i);
      selectDayElement.appendChild(opDayElement);
    }
  }
  button.onclick = function () {
    var getSelectedYear = selectYearElement.selectedIndex + startYear;
    var getSelectedMonth = selectMonthElement.selectedIndex + 1;
    var getSelectedDay = selectDayElement.selectedIndex + 1;
    alert("当前选中的日期是：" + getSelectedYear + "年" + getSelectedMonth + "月" + getSelectedDay + "日")
  }
  //getDay
</script>
</body>
</html>

运行效果图如下：