input 日期选择功能的javascript代码

<INPUT onfocus=setday(this) size=30 name=call_board_startdate> 
<script> 
document.writeln('<div id="meizzDateLayer" style="position: absolute; width: 182; height: 166; z-index: 9998; display: none">'); 
document.writeln(' <span id="tmpSelectYearLayer" style="z-index: 9999;position: absolute;top: 2; left: 18;display: none"></span>'); 
document.writeln(' <span id="tmpSelectMonthLayer" style="z-index: 9999;position: absolute;top: 2; left: 75;display: none"></span>'); 
document.writeln(' <table border="0" cellspacing="1" cellpadding="0" width="100%" height="160" bgcolor="#808080" onselectstart="return false">'); 
document.writeln(' <tr>'); 
document.writeln(' <td width="100%" height="23" bgcolor="#FFFFFF">'); 
document.writeln(' <table border="0" cellspacing="1" cellpadding="0" width="100%" height="23">'); 
document.writeln(' <tr align="center">'); 
document.writeln(' <td width="25" align="center" bgcolor="#808080" style="font-size:12px;cursor: hand;color: #FFFFFF"'); 
document.writeln(' onclick="meizzPrevM()" title="向前翻月" Author="meizz"><b Author="meizz"><</b>'); 
document.writeln(' </td>'); 
document.writeln(' <td width="" align="center" style="font-size:13px; font-weight:normal; cursor:default" Author="meizz">'); 
document.writeln(' <span Author="meizz" id="meizzYearHead" onclick="tmpSelectYearInnerHTML(this.innerText)"></span> 年 <span id="meizzMonthHead" Author="meizz" onclick="tmpSelectMonthInnerHTML(this.innerText)"></span> 月</td>'); 
document.writeln(' <td width="25" bgcolor="#808080" align="center" style="font-size:12px;cursor: hand;color: #FFFFFF"'); 
document.writeln(' onclick="meizzNextM()" title="往后翻月" Author="meizz"><b Author="meizz">></b></td>'); 
document.writeln(' </tr>'); 
document.writeln(' </table>'); 
document.writeln(' </td>'); 
document.writeln(' </tr>'); 
document.writeln(' <tr>'); 
document.writeln(' <td width="100%" height="18" bgcolor="#808080">'); 
document.writeln(' <table border="0" cellspacing="0" cellpadding="0" width="99%" height="1" style="cursor:default">'); 
document.writeln(' <tr align="center">'); 
document.writeln(' <td style="font-size:12px;color:#FFFFFF" Author="meizz">日</td>'); 
document.writeln(' <td style="font-size:12px;color:#FFFFFF" Author="meizz">一</td>'); 
document.writeln(' <td style="font-size:12px;color:#FFFFFF" Author="meizz">二</td>'); 
document.writeln(' <td style="font-size:12px;color:#FFFFFF" Author="meizz">三</td>'); 
document.writeln(' <td style="font-size:12px;color:#FFFFFF" Author="meizz">四</td>'); 
document.writeln(' <td style="font-size:12px;color:#FFFFFF" Author="meizz">五</td>'); 
document.writeln(' <td style="font-size:12px;color:#FFFFFF" Author="meizz">六</td>'); 
document.writeln(' </tr>'); 
document.writeln(' </table>'); 
document.writeln(' </td>'); 
document.writeln(' </tr>'); 
document.writeln(' <tr>'); 
document.writeln(' <td width="100%" height="120">'); 
document.writeln(' <table border="0" cellspacing="1" cellpadding="0" width="100%" height="120" bgcolor="#FFFFFF">'); 
var n=0;for (j=0;j<5;j++){ 
document.writeln('<tr align=center>'); 
for (i=0;i<7;i++){ 
document.writeln('<td width=20 height=20 id=meizzDay'+n+' style=font-size:12px Author=meizz onclick=meizzDayClick(this.innerText)></td>');n++;} 
document.writeln('</tr>');} 
document.writeln(' <tr align="center">'); 
document.writeln(' <td width="20" height="20" style="font-size:12px" id="meizzDay35" Author="meizz" onclick="meizzDayClick(this.innerText)"></td>'); 
document.writeln(' <td width="20" height="20" style="font-size:12px" id="meizzDay36" Author="meizz" onclick="meizzDayClick(this.innerText)"></td>'); 
document.writeln(' </tr>'); 
document.writeln(' </table>'); 
document.writeln(' </td>'); 
document.writeln(' </tr>'); 
document.writeln(' <tr>'); 
document.writeln(' <td>'); 
document.writeln(' <table border="0" cellspacing="1" cellpadding="0" width="100%" bgcolor="#FFFFFF">'); 
document.writeln(' <tr>'); 
document.writeln(' <td Author="meizz" align="left"><input Author="meizz" type="button" value="<<" title="向前翻年" onclick="meizzPrevY()" onfocus="this.blur()"'); 
document.writeln(' class="FlatButton2" ID="Button1" NAME="Button1"><input Author="meizz" title="向前翻月" type="button" value="<" onclick="meizzPrevM()" onfocus="this.blur()"'); 
document.writeln(' class="FlatButton2" ID="Utton1" NAME="Utton1"></td>'); 
document.writeln(' <td Author="meizz" align="center"><input Author="meizz" type="button" value="今天" onclick="meizzToday()" onfocus="this.blur()"'); 
document.writeln(' title="转到今天的日期" class="FlatButton" ID="Button2" NAME="Button2"></td>'); 
document.writeln(' <td Author="meizz" align="right"><input Author="meizz" type="button" value=">" onclick="meizzNextM()" onfocus="this.blur()"'); 
document.writeln(' title="往后翻月" class="FlatButton2" ID="Button3" NAME="Button3"><input Author="meizz" type="button" value=">>" title="往后翻年" onclick="meizzNextY()" onfocus="this.blur()"'); 
document.writeln(' class="FlatButton2" ID="Button4" NAME="Button4"></td>'); 
document.writeln(' </tr>'); 
document.writeln(' </table>'); 
document.writeln(' </td>'); 
document.writeln(' </tr>'); 
document.writeln(' </table>'); 
document.writeln('<iframe src="javascript:false" style="position:absolute; visibility:inherit; top:0px; left:0px; width:200px; height:200px; z-index:-1; filter="progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)";"></iframe>'); 
document.writeln('</div>'); 
document.writeln('<style type="text/css">'); 
document.writeln('.FlatButton {background-color: #f0f0f0; color: #000000;font-family:宋体;'); 
document.writeln(' font-size: 12px;position:relative;width:64px;height:20px;valign:top;cursor:hand;'); 
document.writeln(' border-left: 1px solid #DDDDDD; border-right: 1px solid #999999; '); 
document.writeln(' border-top: 1px solid #DDDDDD; border-bottom: 1px solid #999999 ;'); 
document.writeln(' }'); 
document.writeln(' .FlatButton2 {background-color: #f0f0f0; color: #000000;font-family:宋体;'); 
document.writeln(' font-size: 12px;position:relative;height:20px;valign:top;cursor:hand;'); 
document.writeln(' border-left: 1px solid #DDDDDD; border-right: 1px solid #999999; '); 
document.writeln(' border-top: 1px solid #DDDDDD; border-bottom: 1px solid #999999 ;'); 
document.writeln(' }'); 
document.writeln('</style>'); 
var outObject; 
function setday(tt,obj) //主调函数 
{ 
if (arguments.length > 2){alert("对不起！传入本控件的参数太多！");return;} 
if (arguments.length == 0){alert("对不起！您没有传回本控件任何参数！");return;} 
var dads = document.all.meizzDateLayer.style;var th = tt; 
var ttop = tt.offsetTop; //TT控件的定位点高

var thei = tt.clientHeight; //TT控件本身的高 
var tleft = tt.offsetLeft; //TT控件的定位点宽

var ttyp = tt.type; //TT控件的类型

while (tt = tt.offsetParent){ttop+=tt.offsetTop; tleft+=tt.offsetLeft;} 
dads.top = (ttyp=="image")? ttop+thei : ttop+thei+6; 
dads.left = tleft; 
outObject = (arguments.length == 1) ? th : obj; 
dads.display = ''; 
event.returnValue=false; 
}

var MonHead = new Array(12); //定义阳历中每个月的最大天数

MonHead[0] = 31; MonHead[1] = 28; MonHead[2] = 31; MonHead[3] = 30; MonHead[4] = 31; MonHead[5] = 30; 
MonHead[6] = 31; MonHead[7] = 31; MonHead[8] = 30; MonHead[9] = 31; MonHead[10] = 30; MonHead[11] = 31;

var meizzTheYear=new Date().getFullYear(); //定义年的变量的初始值

var meizzTheMonth=new Date().getMonth()+1; //定义月的变量的初始值

var meizzWDay=new Array(37); //定义写日期的数组

function document.onclick() //任意点击时关闭该控件 
{ 
with(window.event.srcElement) 
{ if (tagName != "INPUT" && getAttribute("Author")==null) 
{ 
document.all.meizzDateLayer.style.display="none"; 
//add on 2004-9-7 
//begin 
if (document.getElementsByTagName("select")) 
{ 
var obj; 
obj=document.getElementsByTagName("select"); 
for (i=0;i<obj.length;i++) 
{ 
if (obj[i].style.display=="none") 
{obj[i].style.display="block";} 
} 
} 
//end 
} 
} 
}

function meizzWriteHead(yy,mm) //往 head 中写入当前的年与月

{ document.all.meizzYearHead.innerText = yy; 
document.all.meizzMonthHead.innerText = mm; 
}

function closeLayer() //这个层的关闭 
{ 
document.all.meizzDateLayer.style.display="none"; 
}

function document.onkeydown() 
{ 
if (window.event.keyCode==27)document.all.meizzDateLayer.style.display="none"; 
}

function IsPinYear(year) //判断是否闰平年

{ 
if (0==year%4&&((year%100!=0)||(year%400==0))) return true;else return false; 
}

function GetMonthCount(year,month) //闰年二月为29天

{ 
var c=MonHead[month-1];if((month==2)&&IsPinYear(year)) c++;return c; 
}

function GetDOW(day,month,year) //求某天的星期几

{ 
var dt=new Date(year,month-1,day).getDay()/7; return dt; 
}

function meizzSetDay(yy,mm) //主要的写程序********** 
{ 
meizzWriteHead(yy,mm); 
for (var i = 0; i < 37; i++){meizzWDay[i]=""}; //将显示框的内容全部清空

var day1 = 1,firstday = new Date(yy,mm-1,1).getDay(); //某月第一天的星期几

for (var i = firstday; day1 < GetMonthCount(yy,mm)+1; i++){meizzWDay[i]=day1;day1++;} 
for (var i = 0; i < 37; i++) 
{ var da = eval("document.all.meizzDay"+i) //书写新的一个月的日期星期排列

if (meizzWDay[i]!="") 
{ da.innerHTML = "<b>" + meizzWDay[i] + "</b>"; 
da.style.backgroundColor = (yy == new Date().getFullYear() && 
mm == new Date().getMonth()+1 && meizzWDay[i] == new Date().getDate()) ? "#FFD700" : "#ADD8E6"; 
da.style.cursor="hand" 
} 
else{da.innerHTML="";da.style.backgroundColor="";da.style.cursor="default"} 
} 
} 
function meizzDayClick(n) //点击显示框选取日期，主输入函数************* 
{ 
var yy = meizzTheYear; 
var mm = meizzTheMonth; 
if (mm < 10){mm = "0" + mm;} 
if (outObject) 
{ 
if (!n) {outObject.value=""; return;} 
if ( n < 10){n = "0" + n;} 
outObject.value= yy + "-" + mm + "-" + n ; //注：在这里你可以输出改成你想要的格式 
closeLayer(); 
} 
else {closeLayer(); alert("您所要输出的控件对象并不存在！");} 
} 
meizzSetDay(meizzTheYear,meizzTheMonth) 
</script>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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