页面代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>JavaScript Sample</title>
<style type="text/css">
div #dataTextContainer
{
border:1px #A5ACB2 solid;
width: 100px;
height: 19px;
text-align: right;
float:left;
}
div #dataTextContainer input
{
border-width: 0px;
border-style: none;
border-color: transparent;
width: 68px;
height: 14px;
font-size: 12px;
text-align: left;
}
div #dataTextContainer button
{
width: 22px;
height: 19px;
margin: 0px;
padding:0px;
text-align: center;
}
div #calendarContainer
{
width: 200px;
height: 100px;
z-index: 10000;
font-size: 13px;
}
</style>
<script type="text/javascript" src="inputDate.js"></script>
</head>
<body>
<div id = "dataTextContainer">
<input name="dataText" id="dateText" type="text" onfocus="javascript:getCurrentDay();"/>
<button onclick="javascript:displayCalendar();">
<img src="rili.jpg" width="15" height="12">
</button>
</div>
<div id="calendarContainer"></div>
</body>
</html>
Javascript代码：
function getCurrentDay()
{
var newDate = new Date;
var odate = document.getElementById("dateText");
var date_year = newDate.getFullYear();
var date_month = newDate.getMonth() + 1;
var date_today = newDate.getDate();
odate.value = date_year+"-"+date_month+"-"+date_today;
}
function displayCalendar()
{
drawCalendar();
}
function closeCalendar()
{
var oCalendarContainer = document.getElementById("calendarContainer");
oCalendarContainer.innerHTML = "";
}
function drawCalendar(sYear,sMonth)
{
var newDate;
if(arguments[0] == null || arguments[1] == null)
{
newDate = new Date();
}
else
{
newDate = new Date(sYear,sMonth - 1);
}
var date_year = newDate.getFullYear();
var date_month = newDate.getMonth() + 1;
var date_today = newDate.getDate();
var date_day = newDate.getDay();
var nextMonth = date_month + 1;
var nextYear = date_year;
var prevMonth = date_month - 1;
var prevYear = date_year;
if(sMonth == 12)
{
nextMonth = 1;
nextYear = date_year + 1;
}
if(sMonth == 1)
{
prevMonth = 12;
prevYear = date_year - 1;
}
var calendarTable = "";
calendarTable += '<table width="200" border="0" cellpadding="0" cellspacing="0" style="background-color:#0066FF;text-align:center;">';
calendarTable += ' <tr style="background-color:#339999;">';
//向前翻年
calendarTable += '<td colspan="2" onclick="javascript:drawCalendar('+(prevYear - 1)+','+prevMonth+');"'+
' style="cursor:pointer;background-color:#FF6600;"><<<</td>';
//向前翻月
calendarTable += '<td colspan="2" onclick="javascript:drawCalendar('+prevYear+','+prevMonth+');"'+
' style="cursor:pointer;background-color:#FF6600;"><<</td>';
//向后翻月
calendarTable += '<td colspan="2" onclick="javascript:drawCalendar('+nextYear+','+nextMonth+');"'+
' style="cursor:pointer;background-color:#FF6600;">>></td>';
//向后翻年
calendarTable += '<td colspan="1" onclick="javascript:drawCalendar('+(nextYear + 1)+','+nextMonth+');"'+
' style="cursor:pointer;background-color:#FF6600;">>>></td>';
calendarTable += ' </tr>';
//星期表头
calendarTable += ' <tr style="background-color:#6699FF;">';
calendarTable += ' <td>日</td>';
calendarTable += ' <td>一</td>';
calendarTable += ' <td>二</td>';
calendarTable += ' <td>三</td>';
calendarTable += ' <td>四</td>';
calendarTable += ' <td>五</td>';
calendarTable += ' <td>六</td>';
calendarTable += ' </tr>';
//计算一个月内的天数,注意闰月
var dayNum_in_month = [31,28,31,30,31,30,31,31,30,31,30,31];
var isleapyear = date_year % 4;
if(isleapyear == 0)
{
dayNum_in_month[1] = 29;
}
var month_alldays = dayNum_in_month[date_month - 1];
//计算行数，line_top表示当前日期上面的行数，包括当前行；line_bot表示当前日期下面的行数，不包括当前行
var line_top;
var line_bot;
if((date_today - date_day + 1) % 7 != 0)
{
line_top = Math.floor((date_today - date_day + 1) / 7) + 1;
}
else
{
line_top = Math.floor((date_today - date_day + 1) / 7);
}
if((30 - date_today + date_day + 1) % 7 != 0)
{
line_bot = Math.floor((30 - date_today + date_day + 1) / 7) + 1;
}
else
{
line_bot = Math.floor((30 - date_today + date_day + 1) / 7);
}
//定义一个二维数组，预备一个6*7的数组，数组中每个元素对应一个单元格(日期)
var dateList = new Array([""],[""],[""],[""],[""],[""],[""]);
var dateCell;
for(var i = 1; i < 7; i++)
{
//i是行数
calendarTable += ' <tr>';
for(var j = 0; j < 7; j++)
{
//j是列数
dateList[i][j] = date_today - 7 * (line_top - i + 1) + j - date_day;
//如果武器<=0，置空
if((date_today - 7 * (line_top - i + 1) + j - date_day) <= 0)
{
dateList[i][j] = " ";
}
//如果日期大于月总天数，则不显示
if((date_today - 7 * (line_top - i + 1) + j - date_day) > month_alldays)
{
dateList[i][j] = " ";
}
if(dateList[i][j] != " ")
{
//如果单元格不是空，那么可以设置其触发三个事件，共有三个事件
//1、单击事件，将当前日期写入文本框
//2、鼠标指针移到单元格上，改变背景
//3、鼠标指针离开单元格，背景复原
dateCell =
'<td onclick="javascript:setDateText('+date_year+','+date_month+',this.firstChild.nodeValue);"'+'onmouseover="javascript:setFocus(this);"'+' onmouseout="javascript:setFocusOut(this);"'+ ' style="cursor:pointer;">'+dateList[i][j]+'</td>';
if(i == line_top && j == line_bot)
{
dateCell =
'<td onclick="javascript:setDateText('+date_year+','+date_month+',this.firstChild.nodeValue);"'+'onmouseover="javascript:setFocus(this);"'+' onmouseout="javascript:setFocusOut(this);"'+ ' style="cursor:pointer;background-color:#FF6600;">'+dateList[i][j]+'</td>';
}
}
else
{
dateCell = "<td> </td>";
}
calendarTable += dateCell;
}
calendarTable += '</tr>';
}
calendarTable += '<tr><td colspan="7"'+'onclick="javascript:closeCalendar();"'+'style="background-color#339999;cursor:pointer;color:red;font-weight:bold">'+'关闭('+date_year+"年"+date_month+"月"+')</td></tr>';
calendarTable += '</table>';
//将日期写入
var oCalendarContainer = document.getElementById("calendarContainer");
oCalendarContainer.innerHTML = calendarTable;
}
//当鼠标指针指到当前日期单元格
function setFocus(obj)
{
obj.style.backgroundColor = "#FF6600";
}
//当鼠标指针离开当前日期单元格
function setFocusOut(obj)
{
obj.style.backgroundColor = "";
}
//鼠标单击当前单元格
function setDateText(sYear,sMonth,sDate)
{
var oDateText = document.getElementById("dateText");
oDateText.value = sYear + "-" + sMonth + "-" + sDate;
}
JavaScript实现简单日历,布布扣,bubuko.com
原文：http://blog.csdn.net/u011043843/article/details/29435497
