这篇文章主要介绍了JavaScript用select实现日期控件的相关资料,需要的朋友可以参考下
代码很简单,这里就不多废话了,直接给大家源码吧
- <!doctype html>
- <html>
- <head>
- <title>年月日</title>
- </head>
- <body onLoad="init()">
- <select id="year" onChange="swap_day()"></select>年
- <select id="month" onChange="swap_day()"></select>月
- <select id="day"></select>日
- </body>
- <script>
- var month_big = new Array("1","3","5","7","8","10","12"); //包含所有大月的数组
- var month_small = new Array("4","6","9","11"); //包含所有小月的数组
- //页面加载时调用的初始化select控件的option的函数
- function init()
- {
- var select_year = document.getElementById("year"); //获取id为"year"的下拉列表框
- var select_month = document.getElementById("month"); //获取id为"month"的下拉列表框
- var select_day = document.getElementById("day"); //获取id为"day"的下拉列表框
- //将年份选项初始化,从1980到2000
- for(var i = 1980; i <= 2000; i++)
- {
- select_year_option = new Option(i, i);
- select_year.options.add(select_year_option);
- }
- //将月份选项初始化,从1到12
- for(var i = 1; i <= 12; i++)
- {
- select_month_option = new Option(i, i);
- select_month.options.add(select_month_option);
- }
- //调用swap_day函数初始化日期
- swap_day();
- }
- //判断数组array中是否包含元素obj的函数,包含则返回true,不包含则返回false
- function array_contain(array, obj)
- {
- for (var i = 0; i < array.length; i++)
- {
- if (array[i] === obj)
- {
- return true;
- }
- }
- return false;
- }
- //根据年份和月份调整日期的函数
- function swap_day()
- {
- var select_year = document.getElementById("year"); //获取id为"year"的下拉列表框
- var select_month = document.getElementById("month"); //获取id为"month"的下拉列表框
- var select_day = document.getElementById("day"); //获取id为"day"的下拉列表框
- select_day.options.length = 0; //在调整前先清空日期选项里面的原有选项
- var month = select_month.options[select_month.selectedIndex].value; //获取被选中的月份month
- //如果month被包含在month_big数组中,即被选中月份是大月,则将日期选项初始化为31天
- if(array_contain(month_big, month))
- {
- for(var i = 1; i <= 31; i++)
- {
- select_day_option = new Option(i, i);
- select_day.options.add(select_day_option);
- }
- }
- //如果month被包含在month_small数组中,即被选中月份是小月,则将日期选项初始化为30天
- else if(array_contain(month_small, month))
- {
- for(var i = 1; i <= 30; i++)
- {
- select_day_option = new Option(i, i);
- select_day.options.add(select_day_option);
- }
- }
- //如果month为2,即被选中的月份是2月,则调用initFeb()函数来初始化日期选项
- else
- {
- initFeb();
- }
- }
- //判断年份year是否为闰年,是闰年则返回true,否则返回false
- function isLeapYear(year)
- {
- var a = year % 4;
- var b = year % 100;
- var c = year % 400;
- if( ( (a == 0) && (b != 0) ) || (c == 0) )
- {
- return true;
- }
- return false;
- }
- //根据年份是否闰年来初始化二月的日期选项
- function initFeb()
- {
- var select_year = document.getElementById("year"); //获取id为"year"的下拉列表框
- var select_day = document.getElementById("day"); //获取id为"day"的下拉列表框
- var year = parseInt(select_year.options[select_year.selectedIndex].value); //获取被选中的年份并转换成Int
- //如果是闰年,则将日期选项初始化为29天
- if(isLeapYear(year))
- {
- for(var i = 1; i <= 29; i++)
- {
- select_day_option = new Option(i, i);
- select_day.options.add(select_day_option);
- }
- }
- //如果不是闰年,则将日期选项初始化为28天
- else
- {
- for(var i = 1; i <= 28; i++)
- {
- select_day_option = new Option(i, i);
- select_day.options.add(select_day_option);
- }
- }
- }
- </script>
- </html>
以上所述就是本文的全部内容了,希望大家能够喜欢。
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