/* 
* Added by LiuXiaoChong 2005.4.25 
* 限制输入的日期控件 
* Param: txtName 为要限制输入的文本框的名称 
* 
* 功能描述：1，只能输入数字 
*          2，左右键可以移动编辑焦点 
*          3，上下键可以对数据进行微调 
*          4，控件包含了对日期的合法校验 
*/ 
function regDateControl(txtName) 
{ 
	var oInput = document.getElementById(txtName); 
	oInput.middleChar = "-"; 
	oInput.selectIndex = 1; //默认选中年 
	oInput.maxLength = 10; 
	oInput.style.imeMode = "disabled"; 
	oInput.value = specialText_GetDate(oInput.middleChar); 
	oInput.charWidth = oInput.createTextRange().boundingWidth / oInput.maxLength; 
	
	//注册单击事件 
	oInput.onclick = specialText_ClickEvent; 
	oInput.onkeydown = specialText_KeyDownEvent; 
	oInput.onfocus = function(){specialText_SelectYear(this);} 
	oInput.onblur = function() 
	{ 
		specialText_validYear(this); 
		specialText_validMonth(this); 
		specialText_validDate(this); 
	} 
	//屏蔽鼠标右键和拖动操作 
	oInput.oncontextmenu = function(){return false;} 
	oInput.ondrop = function(){return false;} 
} 

//鼠标单击，根据位置对日期进行分体选择 
function specialText_ClickEvent() 
{ 
   event.cancelBubble = true; 
   specialText_validYear(this); 
   specialText_validMonth(this); 
   specialText_validDate(this); 
   if(event.offsetX <= specialText_getCharWidth(this.charWidth,4)) 
     specialText_SelectYear(this); 
   else if(event.offsetX > specialText_getCharWidth(this.charWidth,4) 
       && event.offsetX <= specialText_getCharWidth(this.charWidth,7)) 
     specialText_SelectMonth(this); 
   else if(event.offsetX > specialText_getCharWidth(this.charWidth,7)) 
     specialText_SelectDate(this); 
} 
//选中年份 
function specialText_SelectYear(oInput) 
{ 
   var oRange = oInput.createTextRange(); 
   oRange.moveStart("character",0); 
   oRange.moveEnd("character",-6); 
   //代表选中了年 
   oInput.selectIndex = 1; 
   oRange.select(); 
} 
//选中月份 
function specialText_SelectMonth(oInput) 
{ 
   var oRange = oInput.createTextRange(); 
   oRange.moveStart("character",5); 
   oRange.moveEnd("character",-3); 
   //代表选中了月 
   oInput.selectIndex = 2; 
   oRange.select(); 
} 
//选中日期 
function specialText_SelectDate(oInput) 
{ 
   var oRange = oInput.createTextRange(); 
   oRange.moveStart("character",8); 
   //代表选中了日期 
   oInput.selectIndex = 3; 
   oRange.select(); 
} 
//校验年份有效性 
function specialText_validYear(oInput) 
{ 
   var arrValue = oInput.value.split(oInput.middleChar); 
   var strYear = arrValue[0]; 

   if(parseInt(strYear,10) == 0) 
     arrValue[0] = 2000; 
   //如果年份小于4位，则在2000基础上增加 
   else if(strYear.length < 4) 
     arrValue[0] = 2000 + parseInt(strYear,10); 
   oInput.value = arrValue.join(oInput.middleChar); 
} 
//校验月份有效性 
function specialText_validMonth(oInput) 
{ 
   var arrValue = oInput.value.split(oInput.middleChar); 
   var strMonth = arrValue[1]; 
   //如果月份输入了0，则按1月处理 
   if(parseInt(strMonth,10) == 0) 
     arrValue[1] = "01"; 
   //如果月份是一位，则前面补0 
   else if(strMonth.length < 2) 
     arrValue[1] = "0" + strMonth; 
   //如果月份大于12月，自动转为12月 
   else if(parseInt(strMonth,10) > 12) 
     arrValue[1] = "12"; 
   oInput.value = arrValue.join(oInput.middleChar); 
} 
//校验日期有效性 
function specialText_validDate(oInput) 
{ 
   var arrValue = oInput.value.split(oInput.middleChar); 
   var strYear = arrValue[0]; 
   var strMonth = arrValue[1]; 
   var strDate = arrValue[2]; 
   var intMonth = parseInt(strMonth,10); 
   if(parseInt(strDate,10) == 0) 
     arrValue[2] = "01"; 
   else if(strDate.length < 2) 
     arrValue[2] = "0" + strDate; 
   else 
   { 
     //如果超过了月份的最大天数，则置为最大天数 
     var monthMaxDates = specialText_getMonthDates(strYear,strMonth); 
     if(parseInt(strDate,10) > monthMaxDates) 
       arrValue[2] = monthMaxDates; 
   } 
   oInput.value = arrValue.join(oInput.middleChar); 
} 

function specialText_YearAdd(oInput,isMinus) 
{ 
   var arrValue = oInput.value.split(oInput.middleChar); 
   var strYear = arrValue[0]; 
   if(isMinus) 
   { 
     arrValue[0] = parseInt(strYear,10) - 1; 
     if(parseInt(arrValue[0],10) < 1) 
       arrValue[0] = "0001"; 
   } 
   else 
     arrValue[0] = parseInt(strYear,10) + 1; 
   oInput.value = arrValue.join(oInput.middleChar); 
   specialText_validYear(oInput); 
   specialText_SelectYear(oInput); 
} 

function specialText_MonthAdd(oInput,isMinus) 
{ 
   var arrValue = oInput.value.split(oInput.middleChar); 
   var strMonth = arrValue[1]; 
   if(isMinus) 
   { 
     arrValue[1] = parseInt(strMonth,10) - 1; 
     if(parseInt(arrValue[1],10) == 0) 
       arrValue[1] = "12"; 
   } 
   else 
   { 
     arrValue[1] = parseInt(strMonth,10) + 1; 
     if(parseInt(arrValue[1],10) == 13) 
       arrValue[1] = "01"; 
   } 
   oInput.value = arrValue.join(oInput.middleChar); 
   specialText_validMonth(oInput); 
   specialText_SelectMonth(oInput); 
} 

function specialText_DateAdd(oInput,isMinus) 
{ 
   var arrValue = oInput.value.split(oInput.middleChar); 
   var strYear = arrValue[0]; 
   var strMonth = arrValue[1]; 
   var strDate = arrValue[2]; 
   var monthMaxDates = specialText_getMonthDates(strYear,strMonth); 

   if(isMinus) 
   { 
     arrValue[2] = parseInt(strDate,10) - 1; 
     if(parseInt(arrValue[2],10) == 0) 
       arrValue[2] = monthMaxDates; 
   } 
   else 
   { 
     arrValue[2] = parseInt(strDate,10) + 1; 
     if(parseInt(arrValue[2],10) == (monthMaxDates + 1)) 
       arrValue[2] = "01"; 
   } 
   oInput.value = arrValue.join(oInput.middleChar); 
   specialText_validDate(oInput); 
   specialText_SelectDate(oInput); 
} 

function specialText_KeyDownEvent() 
{ 
   //如果按了数字键 
   if((event.keyCode >= 48 && event.keyCode <= 57) || 
    (event.keyCode >= 96 && event.keyCode <= 105)) 
   {   
     var oRange = document.selection.createRange(); 
     if(oRange.text.indexOf(this.middleChar) != -1) 
       event.returnValue = false; 
     else 
       event.returnValue = true; 
   } 
   //如果按了方向键 
   else if(event.keyCode >= 37 && event.keyCode <= 40) 
   { 
     event.returnValue = false; 
     var keyCode = event.keyCode; 
     //按了左键 
     if(keyCode == 37) 
     { 
       if(this.selectIndex == 1) 
       { 
         specialText_validYear(this); 
         specialText_SelectDate(this); 
       } 
       else if(this.selectIndex == 2) 
       { 
         specialText_validMonth(this); 
         specialText_SelectYear(this); 
       } 
       else if(this.selectIndex == 3) 
       { 
         specialText_validDate(this); 
         specialText_SelectMonth(this); 
       } 
     } 
     //按了右键 
     if(keyCode == 39) 
     { 
       if(this.selectIndex == 1) 
       { 
         specialText_validYear(this); 
         specialText_SelectMonth(this); 
       } 
       else if(this.selectIndex == 2) 
       { 
         specialText_validMonth(this); 
         specialText_SelectDate(this); 
       } 
       else if(this.selectIndex == 3) 
       { 
         specialText_validDate(this); 
         specialText_SelectYear(this); 
       } 
     } 

     //按了上键 
     if(keyCode == 38) 
     { 
       if(this.selectIndex == 1) 
       { 
         specialText_validYear(this); 
         specialText_YearAdd(this,true); 
       } 
       else if(this.selectIndex == 2) 
       { 
         specialText_validMonth(this); 
         specialText_MonthAdd(this,true); 
       } 
       else if(this.selectIndex == 3) 
       { 
         specialText_validDate(this); 
         specialText_DateAdd(this,true); 
       } 
     } 

     //按了下键 
     if(keyCode == 40) 
     { 
       if(this.selectIndex == 1) 
       { 
         specialText_validYear(this); 
         specialText_YearAdd(this,false); 
       } 
       else if(this.selectIndex == 2) 
       { 
         specialText_validMonth(this); 
         specialText_MonthAdd(this,false); 
       } 
       else if(this.selectIndex == 3) 
       { 
         specialText_validDate(this); 
         specialText_DateAdd(this,false); 
       } 
     } 
   } 
   //如果按了F5 或 TAB，不屏蔽 
   else if(event.keyCode == 116 || event.keyCode == 9) 
     event.returnValue = true; 
   else 
   { 
     event.returnValue = false; 
     event.keyCode = 0; 
   } 
} 

/*---------------------辅助函数-----------------------*/ 
//得到默认日期 
function specialText_GetDate(middleChar) 
{ 
   var oDate = new Date(); 
   return oDate.getYear() + middleChar 
      + (oDate.getMonth() < 9 ? ("0" + (oDate.getMonth()+1)) : (oDate.getMonth()+1)) + middleChar 
      + (oDate.getDate() < 10 ? ("0" + oDate.getDate()) : oDate.getDate()); 
} 
//得到字符像素宽度 
function specialText_getCharWidth(charWidth,charNum) 
{ 
   return charNum * charWidth; 
} 
//得到某年某月的最大天数 
function specialText_getMonthDates(strYear,strMonth) 
{ 
   var intMonth = parseInt(strMonth,10); 
   if(intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7 
    || intMonth == 8 || intMonth == 10 || intMonth == 12) 
     return 31; 
   //处理30天的月份 
   else if(intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11) 
     return 30; 
   //处理2月份 
   else 
   { 
     //闰年 
     if(specialText_isLeapYear(strYear)) 
       return 29; 
     //平年 
     else 
       return 28; 
   } 
} 
//判断是否是闰年 
function specialText_isLeapYear(strYear) 
{ 
   var intYear = parseInt(strYear,10); 
   if((intYear % 4 == 0 && intYear % 100 != 0) || 
    (intYear % 100 == 0 && intYear % 400 == 0)) 
     return true; 
   else 
     return false; 
}