/*
 * 檢查是否為日期(民國年西元年格式皆可)
 * 2009以後皆使用此function
 */
function isDate(str){
	var dStr = trim(str);
	if( isNum(dStr) && dStr.length == 8 ){
		year = parseFloat(dStr.substring(0, 4));
		month = parseFloat(dStr.substring(4, 6));
		day = parseFloat(dStr.substring(6, 8));
		
		if( year < 1 || month < 1 || month > 12 || day < 1 ){
			return false;
		}
		if( ( month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12 ) && day > 31 ){
			return false;
		}
		if( ( month == 2 || month == 4 || month == 6 || month == 9 || month == 11 ) && day > 30 ){
			return false;
		}
		if( month == 2 ){
			if( ( ( year % 4 ) == 0 ) && ( day > 29 ) ){
				return false;
			}
			else if( ( year % 4 != 0 ) && ( day > 28 ) ){
				return false;
			}
		}
		return true;
	}
	//add by DavidYun 2009-01-16 增加檢查民國年(0980116)
	else if(isNum(dStr) && dStr.length == 7){
		year = parseFloat(dStr.substring(0,3));
		year = year + 1911;
		month = parseFloat(dStr.substring(3, 5));
		day = parseFloat(dStr.substring(5, 7));
		
		if( year < 1 || month < 1 || month > 12 || day < 1 ){
			return false;
		}
		if( ( month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12 ) && day > 31 ){
			return false;
		}
		if( ( month == 2 || month == 4 || month == 6 || month == 9 || month == 11 ) && day > 30 ){
			return false;
		}
		if( month == 2 ){
			if( ( ( year % 4 ) == 0 ) && ( day > 29 ) ){
				return false;
			}
			else if( ( year % 4 != 0 ) && ( day > 28 ) ){
				return false;
			}
		}
		return true;
	}
	else
		return false;
}
/*
 * Wells提供檢查是否為數字的function 2009-01-13
 * 是否為整數, 有傳入len,表示數字長度, eqFlag=y, 表示長度需等於len，其它則為<=len
 */
function isNum(str, len, eqFlag) {

    var re = /^\d*$/;

    if(len != null && re.test(len)) {
        if(eqFlag != null && eqFlag == "y")
            return (str.length == len && re.test(str));
        else
            return (str.length <= len && re.test(str));
    }
    else
        return re.test(str);

}

/* 
 * 是否為英,數字,空白,str:待測字串(len:文字長度限制,eqFlag:y,表示長度需等於len，其它則為<=len)
 * str為必傳欄位,括號內為非必傳參數
 * 2009以後檢查英數字皆用此chkStr
 */
function chkStr(str, len, eqFlag) {

    var re = /^[a-zA-Z0-9 ]*$/;

    if(len != null && isNum(len)) {
        if(eqFlag != null && eqFlag == "y")
            return (str.length == len && re.test(str));
        else
            return (str.length <= len && re.test(str));
    }
    else
        return re.test(str);
}
/*
 * 轉換日期為西元年 add by DavidYun 2009-01-16
 * 2009以後皆使用此function
 */
function transDateToAD(date){
	var year;
	var rest;
	if(date.length == 7){
		year = parseFloat(date.substring(0,3)) + 1911;
		rest = date.substring(3,7);
	}
	else if(date.length == 8){
		year = date.substring(0,4);
		rest = date.substring(4,8);
	}
	else{
		alert("合法日期格式為yyyymmdd or yyymmdd!");
	}
	return year + "" + rest;
}
/*
 * Modify from checkDateGap
 * Mark by DavidYun 2008-04-04
 * 2009以後皆使用此function
 * 檢查日期區間是否大於validGap(=7)西元年與民國年皆適用
 * @param date1 欲比較之日期1
 * @param date2 欲比較之日期2
 */
function checkDateGapBothFormat(date1, date2) 
{
	MINI_SECORD_TO_DAY = 60 * 60 * 24 * 1000;
	var validGap = 7;

	if(date1.length == 7 && date2.length == 7){
		yy1 = date1.substring(0,3);
		mm1 = date1.substring(3,5);
		dd1 = date1.substring(5,7);

		yy2 = date2.substring(0,3);
		mm2 = date2.substring(3,5);
		dd2 = date2.substring(5,7);

		newdate1 = new Date(eval(yy1)+1911,eval(mm1-1),eval(dd1));
		newdate2 = new Date(eval(yy2)+1911,eval(mm2-1),eval(dd2));
	}
	else if(date1.length == 8 && date2.length == 8){
		yy1 = date1.substring(0,4);
		mm1 = date1.substring(4,6);
		dd1 = date1.substring(6,8);

		yy2 = date2.substring(0,4);
		mm2 = date2.substring(4,6);
		dd2 = date2.substring(6,8);

		newdate1 = new Date(eval(yy1),eval(mm1-1),eval(dd1));
		newdate2 = new Date(eval(yy2),eval(mm2-1),eval(dd2));
	}
	else{
		alert("起迄日期格式必須相同!");
		return false;
	}
	range_days = (newdate2-newdate1)/MINI_SECORD_TO_DAY;
	//alert(range_days);

	if( range_days < 0 || range_days > validGap )
		return false;
	else
		return true;
}
/*
 * 2008-10-13 DavidYun 新增西元日期是否合法之檢核
 */
//======日期判斷=================================================
function fnValidDate(dateStr)
{
	var leap = 28;
	if (leapYear(parseInt(dateStr.substring(0,4))) == 1)
		leap = 29;
	var tmp = parseInt(dateStr.substring(4,6))    
	if (dateStr.substring(4,6) == '08')
		tmp = 8;
	if (dateStr.substring(4,6) == '09')
		tmp = 9

		if (tmp < 1 || tmp > 12)
		{
			return (false)
		}

	var monthTable = new Array(12);
	monthTable[1] = 31;
	monthTable[2] = leap;
	monthTable[3] = 31;
	monthTable[4] = 30;
	monthTable[5] = 31;
	monthTable[6] = 30;
	monthTable[7] = 31;
	monthTable[8] = 31;
	monthTable[9] = 30;
	monthTable[10] = 31;
	monthTable[11] = 30;
	monthTable[12] = 31;

	var dtmp = parseInt(dateStr.substring(6))    
	if(dateStr.substring(6) == '08')
		dtmp = 8;
	if(dateStr.substring(6) == '09')
		dtmp = 9

		if(dtmp < 1 || dtmp > monthTable[tmp])
		{
			return (false)
		}
	return (true)
}
//======閏年判斷==================================================================
function leapYear (Year)
{
	if (((Year % 4)==0) && ((Year % 100)!=0) || ((Year % 400)==0))
		return (1);
	else
		return (0);
}
//=======刪除千分號=================================================================
function changeVal(T1)
{
	pos=0
	var oring=T1.value;
	pos=oring.indexOf(",");

	while (pos !=-1)
	{
		oring=(oring).replace(",","");
		pos=oring.indexOf(",");
	}   

	return oring;
}

//=======加上千分號=========================================================
function changeStr(T1)
{
	c="";
	var oring = T1.value
	var t1v1  = T1.value
	var t1v2  = "";
	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~    
	if (isNaN(Math.abs(T1.value))) 
	{
		alert("請輸入數字");
		return oring;
	}else{	
		if (eval(T1.value) < 0 ) 
			c="-";
	}   	

	if(T1.value.length == 0)
		return oring;
	if(Math.abs(T1.value) == 0)
		return oring;

	T1.value= Math.abs(T1.value);    
	t1v1  = T1.value

	if((pos=t1v1.indexOf(".")) != -1) 
	{
		t1v2 = t1v1.substring(pos,((T1.value).length));
		t1v1 = t1v1.substring(0,pos);
	}
	//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  
	pos=oring.indexOf(",")
	if (pos==-1) 
	{ 
		var len   = t1v1.length;
		a=Math.floor(len % 3)
		b=Math.floor(len / 3 -1)
		if(a !=0 && b >= 0)        
			oring = t1v1.substring(0,a) + ",";
		else if(b<0)
			oring = t1v1
			else 
				oring = "";
		for(i=0;i<b;i++)
		{
			oring += t1v1.substring(a,a+3) + ",";
			a += 3;
		} // end of for

		oring += t1v1.substring(a,len);

		if (c == "-" ) 
		{
			oring="-"+oring;
		}	
		if(t1v2 != "")
			oring += t1v2;

		return oring
	}
}

//======消除字串中的空白與斷行等…===============================================
function trimString(inString) 
{
	var outString;
	var startPos;
	var endPos;
	var ch;

	// where do we start?
	startPos = 0;
	test = 0;
	ch = inString.charAt(startPos);
	while ((ch == " ") || (ch == "\b") || (ch == "\f") || (ch == "\n") || (ch == "\r") || (ch == "\n")) {
		startPos++;
		if ( ch==" " ) {
			test++;
		}	
		ch = inString.charAt(startPos);
	}
	if  ( test==inString.length ) 
		flag = true;
	else
		flag = false;
	endPos = inString.length - 1;
	ch = inString.charAt(endPos);
	while ((ch == " ") || (ch == "\b") || (ch == "\f") || (ch == "\n") || (ch == "\r") || (ch == "\n")) {
		endPos--;
		ch = inString.charAt(endPos);
	}

	// get the string
	outString = inString.substring(startPos, endPos + 1);
	if ( flag==true ) 
		return "";
	else	
		return outString;
}
//======檢查年份(不可為小數也不可為文字,並將負數變成正數傳回)============
function CheckYear(cyear)
{
	if(cyear.value.indexOf(".") != -1)
	{
		alert("年份不可為小數");    
		cyear.focus();
		return false;
	}
	if(isNaN(Math.abs(cyear.value)))
	{
		alert("年份不可為文字");
		cyear.focus();
		return false;
	}
	if(trimString(cyear.value) != '')
		cyear.value = Math.abs(cyear.value);
	return true;
}
//===判斷是否為正確有效的日期(isAllspac=true 日期可全為空白 false 日期不可全為空白)===
function isVaildDate(checkyear,checkmonth,checkday,checkdate,isAllspac,szWarning)
{
	var toWestYear = 0;
	if(trimString(checkyear.value).length<4)
		toWestYear = 1911;

	if(!CheckYear(checkyear))
		return false;
	if(trimString(checkyear.value)!="" && trimString(checkmonth.value)!="" && trimString(checkday.value)!="")
	{
		if(fnValidDate((eval(checkyear.value)+toWestYear) + checkmonth.value + checkday.value))
		{
			if(checkdate != null)
				checkdate.value = (eval(checkyear.value)+toWestYear) + checkmonth.value + checkday.value;
		}
		else
		{
			alert(szWarning + "為錯誤的日期");
			checkyear.focus();
			return false;
		}    
	}
	else if(trimString(checkyear.value)=="" && trimString(checkmonth.value)=="" && trimString(checkday.value)=="")
	{
		if(!isAllspac)
		{
			alert(szWarning + "不可全為空白");
			checkyear.focus();
			return false;
		}
	}
	else
	{

		if(isAllspac)
			alert("請輸入完整的"+ szWarning+ "或者都不輸入");
		else
			alert("請輸入完整的"+ szWarning);                
		checkyear.focus();    
		return false;
	}
	return true            
}
//=====檢查日期===========================================================
function checkdate(startdate,message)
{
	if(isNaN(Math.abs(startdate)))
	{
		alert("日期不可為文字!");
		return false;
	}
	if(startdate.length < 8 && startdate.length > 4)
		startdate = (Math.abs(startdate.substring(0,startdate.length-4))+1911)+startdate.substring(startdate.length-4,startdate.length);
	else if(startdate.length >=8)
		startdate = (Math.abs(startdate.substring(0,startdate.length-4)))+startdate.substring(startdate.length-4,startdate.length);
	else
		alert(message + "日期有誤!");

	if(!fnValidDate(startdate))
	{
		alert(message + "日期有誤!");    
		return false;
	}
	return startdate;
}
//======檢查小數點位數是否正確===================================================================
function isRightDecimal(checkValue,checklength,szWarning)
{
	if(checkValue.indexOf(".") != -1 )
	{
		var len = checkValue.substring(checkValue.indexOf(".")+1,checkValue.length);
		if(len.length > checklength)
		{
			if(checklength != 0)
				alert( szWarning + "的小數點後只能有 " + checklength + " 個位數");  
			else
				alert( szWarning + "不能有小數位數");  
			return false;  
		}
	}
	return true;
}
//======月份相加=======================================================
function AddMonth(baseDate,amount)
{
	if(isNaN(amount=parseInt(amount)))
		return false;
	if(baseDate.length<5)
		return false;
	var toWestYear = 0;
	var monthTable = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

	var year  = Math.abs(baseDate.substring(0,baseDate.length-4));
	if(year.length<4)
		toWestYear = 1911;
	var month = Math.abs(baseDate.substring(baseDate.length-4,baseDate.length-2));
	var day   = Math.abs(baseDate.substring(baseDate.length-2,baseDate.length));
	var addyear  = (month+amount)/12;
	addyear = (addyear >=0)?Math.floor(addyear):Math.ceil(addyear);
	var newmonth = (month+amount)%12;
	if(newmonth<=0)
	{
		newmonth = 12+newmonth;
		addyear --;
	}    
	year += addyear;
	monthTable[1] = (leapYear(addyear+toWestYear) == 1)?29:28;

	if(day>monthTable[newmonth-1])
		day = monthTable[newmonth-1];
	return (year*10000) + (newmonth*100) + day;        
}
//================================================================
//=======檢查日期起迄是否相差七日================================
function checkDateGap(date1, date2) 
{
	MINI_SECORD_TO_DAY = 60 * 60 * 24 * 1000;

	yy1 = date1.substring(0,3);
	mm1 = date1.substring(3,5);
	dd1 = date1.substring(5,7);

	yy2 = date2.substring(0,3);
	mm2 = date2.substring(3,5);
	dd2 = date2.substring(5,7);

	newdate1 = new Date(eval(yy1)+1911,eval(mm1-1),eval(dd1));
	newdate2 = new Date(eval(yy2)+1911,eval(mm2-1),eval(dd2));

	range_days = Math.abs((newdate2-newdate1)/MINI_SECORD_TO_DAY);

	if( range_days > 7 )
		return false;
	else
		return true;
}

/*
 * add by DavidYun 2008-10-13
 * @param 西元日期(8碼)
 */
function isNum(str)
{
	re = /^\d*$/; //是否為數字
	return re.test(str);
}
function trim(str)
{
	return str.replace(/^\s+|\s+$/g, "");
}