JavaScript用select實(shí)現(xiàn)日期控件

2024-05-06 16:23:19

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這篇文章主要介紹了JavaScript用select實(shí)現(xiàn)日期控件的相關(guān)資料,需要的朋友可以參考下

代碼很簡(jiǎn)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(shù)組

var month_small = new Array("4","6","9","11"); //包含所有小月的數(shù)組

//頁(yè)面加載時(shí)調(diào)用的初始化select控件的option的函數(shù)

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(xiàng)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(xiàng)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(diào)用swap_day函數(shù)初始化日期

swap_day();

}

//判斷數(shù)組array中是否包含元素obj的函數(shù)，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(jù)年份和月份調(diào)整日期的函數(shù)

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(diào)整前先清空日期選項(xiàng)里面的原有選項(xiàng)

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(shù)組中，即被選中月份是大月，則將日期選項(xiàng)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(shù)組中，即被選中月份是小月，則將日期選項(xiàng)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(diào)用initFeb()函數(shù)來(lái)初始化日期選項(xiàng)

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(jù)年份是否閏年來(lái)初始化二月的日期選項(xiàng)

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(zhuǎn)換成Int

//如果是閏年，則將日期選項(xiàng)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(xiàng)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>