jquery.validator for Taiwan ID

jquery-validator-twid.js

//增加固定長度的 validation rule
$.validator.addMethod("exactlength", function(value, element, param) {
	return this.optional(element) || value.length == param;
}, $.validator.format("輸入長度必須為 {0} 個字元."));

$.validator.addMethod("checkTWPID", function(value, element, param) {
	var letters = new Array('A', 'B', 'C', 'D', 
		'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 
		'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 
		'X', 'Y', 'W', 'Z', 'I', 'O');
	var multiply = new Array(1, 9, 8, 7, 6, 5, 4, 3, 2, 1);
	var nums = new Array(2);
	var firstChar;
	var firstNumber;
	var lastNum;
	var totol = 0;
	//檢查基本格式
	var regExpID =/^[a-z](1|2)\d{8}/i;
	if (value.search(regExpID) == -1) {
		return false;
	}
	firstChar = value.charAt(0).toUpperCase();
	lastNum = value.charAt(9);
	for (var i = 0; i < 26; i++) {
		if (firstChar == letters[i]) {
			firstNumber = i + 10;
			nums[0] = Math.floor(firstNumber / 10);
			nums[1] = firstNumber - (nums[0] * 10);
			break;
		}
	}
	//加總
	for (var i = 0; i < multiply.length; i++) {
		if(i<2) {
			totol += nums[i] * multiply[i];
		} else {
			totol += parseInt(value.charAt(i-1)) * multiply[i];
		}
	}
	//比對尾碼
	if ((10 - (totol %  10)) != lastNum) {
		return false;
	}

	return true;
}, $.validator.format("身份證格式錯誤."));

$(function (){

	$("#form1").validate({
		rules: {
			name: "required",
			ID: {
				required: true,
				exactlength: 10,
				checkTWPID: true
			},
			relate_name: "required",
			relate_ID: {
				required: true,
				exactlength: 10,
				checkTWPID: true
			}
		},
		messages: {
			name: {
				required: "必須輸入資料"
			},
			ID: {
				required: "必須輸入資料"
			},
			relate_ID: {
				required: "必須輸入資料"
			},
			relate_name: {
				required: "必須輸入資料"
			}
		}
	});

});