// JavaScript Document
var ALP_STR = "ABCDEFGHJKLMNPQRSTUVXYWZIO";
var NUM_STR = "0123456789";
var SEX_STR = "12";
var MAX_COUNT = 999;

// ------------------------------------------------------------
// 去字串前後空白
function trim(str) {
	while (str.indexOf(" ")==0) {
		str = str.substring(1, str.length);
	}
	while ((str.length>0) && (str.indexOf(" ")==(str.length-1))) {
		str = str.substring(0, str.length-1);
	}
	return str;
}
 
// ------------------------------------------------------------
// 補前置零
function getZero(iLen, val) {
	var val = val + "";
	var rtn = "";
	for(var i=0; i<iLen; i++) {
		rtn += "0";
	}
	rtn += val;
	rtn = rtn.substring(val.length, rtn.length);
	return rtn;
}
// ------------------------------------------------------------
//身份證字號檢查器 - 累加檢查碼
function getPID_SUM(sPID) {
	var iChkNum = 0;
 
	// 第 1 碼
	iChkNum = ALP_STR.indexOf(sPID.substr(0,1)) + 10;
	iChkNum = Math.floor(iChkNum/10) + (iChkNum%10*9);
 
	// 第 2 - 9 碼
	for(var i=1; i<sPID.length-1; i++) {
		iChkNum += sPID.substr(i,1) * (9-i);
	}
 
	// 第 10 碼
	iChkNum += sPID.substr(9,1)*1;
 
	return iChkNum;
}
 
// ------------------------------------------------------------
// 身分證字號檢查器 - 檢查合法字元
function chkPID_CHAR(sPID) {
	var sMsg = "";
	//sPID = trim(sPID.toUpperCase());
	var iPIDLen = String(sPID).length;
 
	var sChk = ALP_STR + NUM_STR;
	for(i=0;i<iPIDLen;i++) {
		if (sChk.indexOf(sPID.substr(i,1)) < 0) {
			sMsg = "這個身分證字號含有不正確的字元！";
			break;
		}
	}
 
	if (sMsg.length == 0) {
		if (ALP_STR.indexOf(sPID.substr(0,1)) < 0) {
			sMsg = "身分證字號第 1 碼應為英文字母(A~Z)。";
		} else if ((sPID.substr(1,1) != "1") && (sPID.substr(1,1) != "2")) {
			sMsg = "身分證字號第 2 碼應為數字(1~2)。";
		} else {
			for(var i=2; i<iPIDLen; i++) {
				if (NUM_STR.indexOf(sPID.substr(i, 1)) < 0) {
					sMsg = "第 " + (i+1) + " 碼應為數字(0~9)。";
					break;
				}
			}
		}
	}
 
	if (sMsg.length != 0) {
		alert(sMsg);
		return false;
	} else {
		return true;
	}
}
 
// ------------------------------------------------------------
// 身分證字號檢查器
function CheckPID(sPID) {
	var sMsg = "正確";
 
	if (sPID == '') {
		sMsg = "請輸入身分證字號";
	} else if (sPID.length != 10) {
		sMsg = sPID.length+"長度應為 10 ！";
	} else {
		sPID = trim(sPID.toUpperCase());
		if (!chkPID_CHAR(sPID)) return;
 
		var iChkNum = getPID_SUM(sPID);
 
		if (iChkNum % 10 != 0) {
			var iLastNum = sPID.substr(9, 1) * 1;
			for (i=0; i<10; i++) {
				var xRightAlpNum = iChkNum - iLastNum + i;
				if ((xRightAlpNum % 10) ==0) {
					sMsg = "最後一個數應為：" + i;
					break;
				}
			}
		}
	}
	//alert(sMsg);
	if (sMsg=="正確")
		return true;
	else
		return false;
}