var DS_x,DS_y;

function dateSelector()  //构造dateSelector对象，用来实现一个日历形式的日期输入框。
{
  var myDate=new Date();
  this.year=myDate.getFullYear();  //定义year属性，年份，默认值为当前系统年份。
  this.month=myDate.getMonth()+1;  //定义month属性，月份，默认值为当前系统月份。
  this.date=myDate.getDate();  //定义date属性，日，默认值为当前系统的日。
  this.inputName='';  //定义inputName属性，即输入框的name，默认值为空。注意：在同一页中出现多个日期输入框，不能有重复的name！
  this.display=display;  //定义display方法，用来显示日期输入框。
}

function display()  //定义dateSelector的display方法，它将实现一个日历形式的日期选择框。
{
  var week=new Array('日','一','二','三','四','五','六');

  document.write("<style type=text/css>");
  document.write("  .ds_font td,span  { font: normal 12px 宋体; color: #000000; }");
  document.write("  .ds_border  { border: 0px solid #000000; cursor: hand; background-color: #AACCFF }");
  document.write("  .ds_border2  { border: 1px solid #000000; cursor: hand; background-color: #AACCFF }");
  document.write("</style>");

  document.write("<input style='text-align:center; width:98px;border:solid gray 1px; border-right:0;height:16px;' id='DS_"+this.inputName+"' name='"+this.inputName+"' value='不限制时间' >");
  
  document.write("<select style='width:19px;font-size:12px;margin:0px;border:1px solid #A4B3C8;background-color:#DFE7EF;'  onclick='show(this)' onfocus=this.blur() >日历<option></option></select>");

  document.write("<div style='position:absolute;display:none;text-align:center;width:0px;height:0px;overflow:visible;' onselectstart='return false;'>");
  document.write("  <div style='position:absolute;left:-143px;top:20px;width:142px;height:165px;background-color:#F6F6F6;border:1px solid #245B7D;' class=ds_font>");
  document.write("    <table cellpadding=0 cellspacing=1 width=140 height=20 bgcolor=#CEDAE7 onmousedown='DS_x=event.x-parentNode.style.pixelLeft;DS_y=event.y-parentNode.style.pixelTop;setCapture();' onmouseup='releaseCapture();' onmousemove='dsMove(this.parentNode)'>");
  document.write("      <tr align=center>");
  document.write("        <td width=12% onmouseover=this.className='ds_border' onmouseout=this.className='' onclick=subYear(this) title='减小年份'><<</td>");
  document.write("        <td width=12% onmouseover=this.className='ds_border' onmouseout=this.className='' onclick=subMonth(this) title='减小月份'><</td>");
  document.write("        <td width=52%><b>"+this.year+"</b><b>年</b><b>"+this.month+"</b><b>月</b></td>");
  document.write("        <td width=12% onmouseover=this.className='ds_border' onmouseout=this.className='' onclick=addMonth(this) title='增加月份'>></td>");
  document.write("        <td width=12% onmouseover=this.className='ds_border' onmouseout=this.className='' onclick=addYear(this) title='增加年份'>>></td>");
  document.write("      </tr>");
  document.write("    </table>");

  document.write("    <table cellpadding=0 cellspacing=0 width=140 height=20 onmousedown='DS_x=event.x-parentNode.style.pixelLeft;DS_y=event.y-parentNode.style.pixelTop;setCapture();' onmouseup='releaseCapture();' onmousemove='dsMove(this.parentNode)' >");
  document.write("      <tr align=center>");
  for(i=0;i<7;i++)
    document.write("      <td>"+week[i]+"</td>");
  document.write("      </tr>");
  document.write("    </table>");

  document.write("    <table cellpadding=0 cellspacing=2 width=140 bgcolor=#EEEEEE>");
  for(i=0;i<6;i++)
  {
    document.write("    <tr align=center>");
    for(j=0;j<7;j++)
      document.write("    <td width=10% height=16 onmouseover=if(this.innerText!=''&&this.className!='ds_border2')this.className='ds_border' onmouseout=if(this.className!='ds_border2')this.className='' onclick=getvalue(this,document.all('DS_"+this.inputName+"')) ></td>");
    document.write("    </tr>");
  }
  document.write("    </table>");
  
  document.write("    <span style=cursor:hand; onmouseover=if(this.innerText!=''&&this.className!='ds_border2')this.className='ds_border' onmouseout=if(this.className!='ds_border2')this.className='' onclick=getvalue3(this,document.all('DS_"+this.inputName+"'))>[今天]</span>");
  
  document.write("    <span style=cursor:hand; onmouseover=if(this.innerText!=''&&this.className!='ds_border2')this.className='ds_border' onmouseout=if(this.className!='ds_border2')this.className='' onclick=getvalue2(this,document.all('DS_"+this.inputName+"'))>[不限制时间]</span>");
  document.write("  </div>");
  document.write("</div>");

  dateShow(document.all("DS_"+this.inputName).nextSibling.nextSibling.childNodes[0].childNodes[2],this.year,this.month)
}

function subYear(obj)  //减小年份
{
  var myObj=obj.parentNode.parentNode.parentNode.cells[2].childNodes;
  myObj[0].innerHTML=eval(myObj[0].innerHTML)-1;

  dateShow(obj.parentNode.parentNode.parentNode.nextSibling.nextSibling,eval(myObj[0].innerHTML),eval(myObj[2].innerHTML))

}

function addYear(obj)  //增加年份
{
  var myObj=obj.parentNode.parentNode.parentNode.cells[2].childNodes;
  myObj[0].innerHTML=eval(myObj[0].innerHTML)+1;
  dateShow(obj.parentNode.parentNode.parentNode.nextSibling.nextSibling,eval(myObj[0].innerHTML),eval(myObj[2].innerHTML))
}

function subMonth(obj)  //减小月份
{
  var myObj=obj.parentNode.parentNode.parentNode.cells[2].childNodes;
  var month=eval(myObj[2].innerHTML)-1;
  if(month==0)
  {
    month=12;
    subYear(obj);
  }
  myObj[2].innerHTML=month;
  dateShow(obj.parentNode.parentNode.parentNode.nextSibling.nextSibling,eval(myObj[0].innerHTML),eval(myObj[2].innerHTML))
}

function addMonth(obj)  //增加月份
{
  var myObj=obj.parentNode.parentNode.parentNode.cells[2].childNodes;
  var month=eval(myObj[2].innerHTML)+1;
  if(month==13)
  {
    month=1;
    addYear(obj);
  }
  myObj[2].innerHTML=month;
  dateShow(obj.parentNode.parentNode.parentNode.nextSibling.nextSibling,eval(myObj[0].innerHTML),eval(myObj[2].innerHTML))
}

function dateShow(obj,year,month)  //显示各月份的日
{
  var myDate=new Date(year,month-1,1);
  var today=new Date();
  var day=myDate.getDay();
  var selectDate=obj.parentNode.parentNode.previousSibling.previousSibling.value.split('-');
  var length;
  switch(month)
  {
    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12:
      length=31;
      break;
    case 4:
    case 6:
    case 9:
    case 11:
      length=30;
      break;
    case 2:
      if((year%4==0)&&(year%100!=0)||(year%400==0))
        length=29;
      else
        length=28;
  }
  for(i=0;i<obj.cells.length;i++)
  {
    obj.cells[i].innerHTML='';
    obj.cells[i].style.color='';
    obj.cells[i].className='';
  }
  for(i=0;i<length;i++)
  {
    obj.cells[i+day].innerHTML=(i+1);

	if(selectDate[0]!="不限制时间"){
   		if(year==eval(selectDate[0])&&month==eval(selectDate[1])&&(i+1)==eval(selectDate[2]))
    	obj.cells[i+day].className='ds_border2'; 
	  }

	 if(year==today.getFullYear()&&(month-1)==today.getMonth()&&(i+1)==today.getDate())
      obj.cells[i+day].style.color='red';
	  
  }
}

function getvalue(obj,inputObj)  //把选择的日期传给输入框
{
  var myObj=inputObj.nextSibling.nextSibling.childNodes[0].childNodes[0].cells[2].childNodes;
  if(obj.innerHTML){
    inputObj.value=myObj[0].innerHTML+"-"+myObj[2].innerHTML+"-"+obj.innerHTML;
  inputObj.nextSibling.nextSibling.style.display='none';
  for(i=0;i<obj.parentNode.parentNode.parentNode.cells.length;i++)
    obj.parentNode.parentNode.parentNode.cells[i].className='';
  obj.className='ds_border2';}
}

function getvalue2(obj,inputObj)  //不限制时间
{
   inputObj.value="不限制时间";
  inputObj.nextSibling.nextSibling.style.display='none';
}

function getvalue3(obj,inputObj)  //今天

{
	var today=new Date();

  var myObj=obj.previousSibling.previousSibling.previousSibling.cells[2].childNodes;
  myObj[0].innerHTML=today.getFullYear();
  myObj[2].innerHTML=eval(today.getMonth()+1);

   inputObj.value=today.getFullYear() + "-" + eval(today.getMonth()+1) + "-" + today.getDate();
   	  dateShow(obj.previousSibling,today.getFullYear(),eval(today.getMonth()+1));
  inputObj.nextSibling.nextSibling.style.display='none';
}


function dsMove(obj)  //实现层的拖移
{/*
  if(event.button==1)
  {
    var X=obj.clientLeft;
    var Y=obj.clientTop;
    obj.style.pixelLeft=X+(event.x-DS_x);
    obj.style.pixelTop=Y+(event.y-DS_y);
  }*/
}

function show(obj)  
{

if(obj.nextSibling.style.display=='none')
{
	obj.nextSibling.style.display='block';
	obj.nextSibling.focus();

}
else
{
	obj.nextSibling.style.display='none';

}

	obj.previousSibling.focus();
		
}