JS实现html下拉菜单列表进行年月日选择

版权声明：adindefinite https://blog.csdn.net/qq_39307284/article/details/89017043

使用JS实现年月日下拉列表的选择
如下图：


具体操作：
两个js文件，设置效果
在.html中导入两个外部js文件

jquery.time.js

$(function () {
$.ms_DatePicker({
YearSelector: ".sel_year",
MonthSelector: ".sel_month",
DaySelector: ".sel_day"
});
});

birthday.js

(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);

在.html文件的head内导入script

<script type="text/javascript" src="js/jquery.time.js"></script>
<script type="text/javascript" src="js/birthday.js"></script>

主体部分的年月日组件代码

<select class="sel_year" name="YYYY">
<option value="">请选择</option>
</select>
<font>年</font>
<select class="sel_month" name="MM">
<option value="">请选择</option>
</select>
<font>月</font>
<select class="sel_day" name="DD">
<option value="">请选择</option>
</select>
<font>日</font>