javascript版的日期输入控件

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

<HEAD>

<TITLE> New Document </TITLE>

function showdb() //显示控件/隐藏空间

{

var CurrentDate=new Date();

var CYear=CurrentDate.getFullYear();

var CMonth=CurrentDate.getMonth();

var CDay=CurrentDate.getDay();

var a=document.getElementById("input_birth");

var obj_year=document.getElementById("year"); //当展开控件时自动取到当前时间（客户端）

obj_year.innerText=CYear;

var obj_month=document.getElementById("month");

obj_month.innerText=CMonth+1;

var s=new Date(CYear,CMonth,1);

var startDay=s.getDay(); //日期起始数字

var numDays=numberOfDays(CMonth,CYear); //本月天数

var day=document.getElementsByName("day");

for(var j=1;j<=numDays;j++) //插入日期

{

day[startDay+j-1].innerText=j;

}

if(a.style.visibility=='visible')

{

a.style.visibility='hidden';

}

else

{

a.style.visibility='visible';

}

function addyear()

{

var obj_year=document.getElementById("year");

var obj_month=document.getElementById("month");

var num_year=obj_year.innerText;

obj_year.innerText=parseInt(num_year)+1; //年数增加

displayCalendar(obj_month.innerText-1,obj_year.innerText);

}

function plusyear()

{

var obj_year=document.getElementById("year");

var obj_month=document.getElementById("month");

var num_year=obj_year.innerText;

obj_year.innerText=parseInt(num_year)-1; //年数减少

displayCalendar(obj_month.innerText-1,obj_year.innerText);

}

function addmonth()

{

var obj_month=document.getElementById("month");

var obj_year=document.getElementById("year");

if(parseInt(obj_month.innerText)>=12) //月数增加到12时，年数相应增加1，月数从1开始

{

obj_month.innerText="0";

obj_year=document.getElementById("year");

var num_year=obj_year.innerText;

obj_year.innerText=parseInt(num_year)+1;

}

var num_month=obj_month.innerText;

obj_month.innerText=parseInt(num_month)+1; //月数增加

displayCalendar(obj_month.innerText-1,obj_year.innerText);

}

function plusmonth()

{

var obj_month=document.getElementById("month");

var obj_year=document.getElementById("year");

if(parseInt(obj_month.innerText)<=1) //月数减少到1时，年数相应减少1，月数从12开始

{

obj_month.innerText="13";

obj_year=document.getElementById("year");

var num_year=obj_year.innerText;

obj_year.innerText=parseInt(num_year)-1;

}

var num_month=obj_month.innerText;

obj_month.innerText=parseInt(num_month)-1; //月数减少

displayCalendar(obj_month.innerText-1,obj_year.innerText);

}

function numberOfDays(month,year) //取得每月天数，判断平年闰年

{

var numDays=new Array(31,28,31,30,31,30,31,31,30,31,30,31);

n=numDays[month];

if(month==1&&year%4==0) ++n;

return n;

}

function displayCalendar(month,year)

{

var d=new Date(year,month,1);

var startDay=d.getDay(); //日期起始数字

var numDays=numberOfDays(month,year); //本月天数

var day=document.getElementsByName("day");

for(var i=0;i<day.length;i++)

{

day[i].innerText="";

}

for(var j=1;j<=numDays;j++) //插入日期

{

day[startDay+j-1].innerText=j;

}

function writeDate(n)

{

document.writeln("<H3 ALIGN='CENTER'>"+n+"</H3>");

}

function add_day(year,month,day)

{

bd.birthdate.value=year+"-"+month+"-"+day;

}

</script>

</HEAD>

<BODY>

</form>

<tr>

</font>年<font id="month"></font>月

<input type="button" value=">" onclick="addmonth()" name="addmonth">

<input type="button" value=">>" name="addyear" onclick="addyear()"></td>

</tr>

<tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

</table>

</td>

</tr>

<tr>

</tr>

</table>

</div>

</BODY>

</HTML>