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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>
  <META NAME="Generator" CONTENT="Microsoft FrontPage 5.0">
  <META NAME="Author" CONTENT="zhaoweiwei">
  <META NAME="Keywords" CONTENT="birthday_input">
  <META NAME="Description" CONTENT="日起输入控件">
  <script>
  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 name="bd">
  <input type="text" name="birthdate" size="20" readOnly><input type="button" value="..." onclick="showdb()">
  </form>
  <div id="input_birth" name="input_birth" style="visibility:hidden; width:239; height:128">
  <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" style="cursor:hand" bordercolor="#111111" width="100%"  height="26">
    <tr>

    <  td width="100%" colspan="3" height="26">&nbsp;&nbsp; <input type="button" value="&lt;&lt;" onclick="plusyear()" name="plusyear">
      <input type="button" value="&lt;" onclick="plusmonth()" name="plusmonth">&nbsp; <font id="year">
      </font>年<font id="month"></font>月
      <input type="button" value="&gt;" onclick="addmonth()" name="addmonth">
      <input type="button" value="&gt;&gt;" name="addyear" onclick="addyear()"></td>
    </tr>
     <tr>
      <td width="100%" colspan="3" height="119" valign="top">
     <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%">
        <tr>
        <td width="14%" align="center"><b><font color="#FF0000">日</font></b></td>
        <td width="14%" align="center"><b>一</b></td>
        <td width="14%" align="center"><b>二</b></td>
        <td width="14%" align="center"><b>三</b></td>
        <td width="14%" align="center"><b>四</b></td>
        <td width="15%" align="center"><b>五</b></td>
        <td width="15%" align="center"><b><font color="#FF0000">六</font></b></td>
      </tr>
      <tr>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)"></td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        </tr>
        <tr>
          <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>

      </tr>
      <tr>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
      </tr>
      <tr>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
      </tr>
      <tr>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>

     <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
      </tr>
      <tr>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="14%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
        <td width="15%" align="center" id="day" onclick="add_day(year.innerText,month.innerText,this.innerText)">　</td>
      </tr>
    </table>
    </td>
  </tr>
  <tr>
    <td width="33%" height="1"></td>
    <td width="33%" height="1"></td>
    <td width="34%" height="1"></td>
    </tr>
  </table>
   </div>
  </BODY>
  </HTML>

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