我们在编辑用户资料时经常会遇到选择生日选项的问题，今天我给大家介绍如何使用js来实现年月日（生日）选择器，能够准确计算闰年的年月日，方便表单处理。
HTML
生日中的年月日以<select>下拉方式，我们给每个select加个rel属性，当已知用户生日日期的，直接通过rel属性标注，插件会将rel属性值转换成select的值。
<label> 生日：</label>
<select class="sel_year" rel="2000"> </select> 年
<select class="sel_month" rel="2"> </select> 月
<select class="sel_day" rel="14"> </select> 日
加载jQuery库和选择器插件：
<script src="jquery.js"></script>
<script src="birthday.js"></script>
jQuery
我们将选择器封装成jQuyer插件的形式，只需使用以下方式调用即可：
$(function () {
$.ms_DatePicker({
YearSelector: ".sel_year",
MonthSelector: ".sel_month",
DaySelector: ".sel_day"
});
});
以下是插件的具体代码：
(function($){
$.extend({
ms_DatePicker: function (options) {
var defaults = {
YearSelector: "#sel_year",
MonthSelector: "#sel_month",
DaySelector: "#sel_day",
FirstText: "--",
FirstValue: 0
};
var opts = $.extend({}, defaults, options);
var $YearSelector = $(opts.YearSelector);
var $MonthSelector = $(opts.MonthSelector);
var $DaySelector = $(opts.DaySelector);
var FirstText = opts.FirstText;
var FirstValue = opts.FirstValue;
// 初始化
var str = "<option value="" + FirstValue + "">"+FirstText+"</option>";
$YearSelector.html(str);
$MonthSelector.html(str);
$DaySelector.html(str);
// 年份列表
var yearNow = new Date().getFullYear();
var yearSel = $YearSelector.attr("rel");
for (var i = yearNow; i >= 1900; i--) {
var sed = yearSel==i?"selected":"";
var yearStr = "<option value="" + i + "" " + sed+">"+i+"</option>";
$YearSelector.append(yearStr);
}
// 月份列表
var monthSel = $MonthSelector.attr("rel");
for (var i = 1; i <= 12; i++) {
var sed = monthSel==i?"selected":"";
var monthStr = "<option value="" + i + "" "+sed+">"+i+"</option>";
$MonthSelector.append(monthStr);
}
// 日列表(仅当选择了年月)
function BuildDay() {
if ($YearSelector.val() == 0 || $MonthSelector.val() == 0) {
// 未选择年份或者月份
$DaySelector.html(str);
} else {
$DaySelector.html(str);
var year = parseInt($YearSelector.val());
var month = parseInt($MonthSelector.val());
var dayCount = 0;
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
dayCount = 31;
break;
case 4:
case 6:
case 9:
case 11:
dayCount = 30;
break;
case 2:
dayCount = 28;
if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0)) {
dayCount = 29;
}
break;
default:
break;
}
var daySel = $DaySelector.attr("rel");
for (var i = 1; i <= dayCount; i++) {
var sed = daySel==i?"selected":"";
var dayStr = "<option value="" + i + "" "+sed+">" + i + "</option>";
$DaySelector.append(dayStr);
}
}
}
$MonthSelector.change(function () {
BuildDay();
});
$YearSelector.change(function () {
BuildDay();
});
if($DaySelector.attr("rel")!=""){
BuildDay();
}
} // End ms_DatePicker
});
})(jQuery);
以上就上有关jQuery年月日（生日）选择器的相关介绍，要了解更多jQuery内容请登录学步园。