這篇文章主要介紹了JavaScript用select實現日期控件的相關資料,需要的朋友可以參考下
代碼很簡單,這里就不多廢話了,直接給大家源碼吧
- <!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"); //包含所有大月的數組
- var month_small = new Array("4","6","9","11"); //包含所有小月的數組
- //頁面加載時調用的初始化select控件的option的函數
- function init()
- {
- var select_year = document.getElementById("year"); //獲取id為"year"的下拉列表框
- var select_month = document.getElementById("month"); //獲取id為"month"的下拉列表框
- var select_day = document.getElementById("day"); //獲取id為"day"的下拉列表框
- //將年份選項初始化,從1980到2000
- for(var i = 1980; i <= 2000; i++)
- {
- select_year_option = new Option(i, i);
- select_year.options.add(select_year_option);
- }
- //將月份選項初始化,從1到12
- for(var i = 1; i <= 12; i++)
- {
- select_month_option = new Option(i, i);
- select_month.options.add(select_month_option);
- }
- //調用swap_day函數初始化日期
- swap_day();
- }
- //判斷數組array中是否包含元素obj的函數,包含則返回true,不包含則返回false
- function array_contain(array, obj)
- {
- for (var i = 0; i < array.length; i++)
- {
- if (array[i] === obj)
- {
- return true;
- }
- }
- return false;
- }
- //根據年份和月份調整日期的函數
- function swap_day()
- {
- var select_year = document.getElementById("year"); //獲取id為"year"的下拉列表框
- var select_month = document.getElementById("month"); //獲取id為"month"的下拉列表框
- var select_day = document.getElementById("day"); //獲取id為"day"的下拉列表框
- select_day.options.length = 0; //在調整前先清空日期選項里面的原有選項
- var month = select_month.options[select_month.selectedIndex].value; //獲取被選中的月份month
- //如果month被包含在month_big數組中,即被選中月份是大月,則將日期選項初始化為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數組中,即被選中月份是小月,則將日期選項初始化為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為2,即被選中的月份是2月,則調用initFeb()函數來初始化日期選項
- else
- {
- initFeb();
- }
- }
- //判斷年份year是否為閏年,是閏年則返回true,否則返回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;
- }
- //根據年份是否閏年來初始化二月的日期選項
- function initFeb()
- {
- var select_year = document.getElementById("year"); //獲取id為"year"的下拉列表框
- var select_day = document.getElementById("day"); //獲取id為"day"的下拉列表框
- var year = parseInt(select_year.options[select_year.selectedIndex].value); //獲取被選中的年份并轉換成Int
- //如果是閏年,則將日期選項初始化為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);
- }
- }
- //如果不是閏年,則將日期選項初始化為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內容了,希望大家能夠喜歡。
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