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。
{
　if (typeof(select_date) == 'undefined' || select_date=='') {
	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。     
  } else {
	var arrDate = select_date.split("-");
	this.year=arrDate[0];
    this.month=arrDate[1];
    this.date=arrDate[2];
  }
  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  {  cursor: hand; background-color: #DDDDDD }");
  document.write("  .ds_border2  {  cursor: hand; background-color: #DDDDDD }");
  document.write("</style>");
  
  document.write("<div id='date_main' style='display:block;text-align:center;width:0px;height:0px;overflow:visible' onselectstart='return false;'>");
  document.write("  <div style='width:190px;height:160px;background-color:#F6F6F6;border:1px solid #0371D2;' class=ds_font>");
  document.write("    <table cellpadding=0 cellspacing=1 width=100% 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)' style='cursor:move;'>");
  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=100% height=20 onmousedown='DS_x=event.x-parentNode.style.pixelLeft;DS_y=event.y-parentNode.style.pixelTop;setCapture();' onmouseup='releaseCapture();' onmousemove='dsMove(this.parentNode)' style='cursor:move;'>");
  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=100% 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=jump(this)></td>");
    document.write("    </tr>");
  }
  document.write("    </table>");

  document.write("  </div>");
  document.write("</div>");
  dateShow(document.getElementById("date_main").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));

  url = "/history/index.php?option=datess&y="+myObj[0].innerHTML+"&m="+myObj[2].innerHTML;
  window.location = url;
}

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));

  url = "/history/index.php?option=datess&y="+myObj[0].innerHTML+"&m="+myObj[2].innerHTML;
  window.location = url;
}

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));

  url = "/history/index.php?option=datess&y="+myObj[0].innerHTML+"&m="+myObj[2].innerHTML;
  window.location = url;
}

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));

  url = "/history/index.php?option=datess&y="+myObj[0].innerHTML+"&m="+myObj[2].innerHTML;
  window.location = url;
}

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

function jump(obj)  //把选择的日期传给输入框
{  
  var myObj=document.getElementById("date_main").childNodes[0].childNodes[0].cells[2].childNodes;
  for(i=0;i<obj.parentNode.parentNode.parentNode.cells.length;i++)
    obj.parentNode.parentNode.parentNode.cells[i].className='';
  obj.className='ds_border2' ;
  url = "/history/index.php?option=datess&y="+myObj[0].innerHTML+"&m="+myObj[2].innerHTML+"&d="+obj.innerHTML;
  window.location = url;
}

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);
  }
}

var myDate=new dateSelector();
myDate.display();