JavaScript ID check Regular expressions (support 15, 18, and province differences)

Source: Internet
Author: User

It is not difficult to do this in fact, on the Internet, there will always be unexpected harvest. But 工欲善其事, its prerequisite. We need to understand the rules of the ID number, the enemy win.
The ID number has 15-bit and 18-bit length two, 15-bit time, is a number, but 18-bit length may have check bit (X), so only check the number is not enough.
Another ID number can be seen a person's age, the location of birth (identity card location?) And so on, these are useful data for us.

The code is as follows Copy Code

<script type= ' text/javascript ' src= ' card.js ' ></script>
<body>
Please enter your ID number:
<input name= ' card_no ' type= ' text ' id= ' card_no ' value= ' 1234567890 '
<input type= ' button ' name= ' Submit ' value= ' click me ' onclick= ' javascript:checkcard (); '/>
</body>
Author:yufulong
Blog:http://www.111cn.net
*/
var vcity={11: "Beijing", 12: "Tianjin", 13: "Hebei", 14: "Shanxi", 15: "Inner Mongolia",
21: "Liaoning", 22: "Jilin", 23: "Heilongjiang", 31: "Shanghai", 32: "Jiangsu",
33: "Zhejiang", 34: "Anhui", 35: "Fujian", 36: "Jiangxi", 37: "Shandong", 41: "Henan",
42: "Hubei", 43: "Hunan", 44: "Guangdong", 45: "Guangxi", 46: "Hainan", 50: "Chongqing",
51: "Sichuan", 52: "Guizhou", 53: "Yunnan", 54: "Tibet", 61: "Shaanxi", 62: "Gansu",
63: "Qinghai", 64: "Ningxia", 65: "Xinjiang", 71: "Taiwan", 81: "Hong Kong", 82: "Macao", 91: "Foreign"
};

Checkcard = function ()
{
var card = document.getElementById (' card_no '). Value;
is empty
if (Card = = = = ")
{
Alert (' Please enter the ID number, the ID number cannot be empty ');
document.getElementById (' Card_no '). Focus;
return false;
}
Checksum length, type
if (Iscardno (card) = = False)
{
Alert (' The ID number you entered is incorrect, please re-enter ');
document.getElementById (' Card_no '). Focus;
return false;
}
Check the provinces
if (checkprovince (card) = = False)
{
Alert (' The ID number you entered is incorrect, please re-enter ');
document.getElementById (' Card_no '). Focus;
return false;
}
Verify Birthday
if (checkbirthday (card) = = False)
{
Alert (' The ID number you entered is not a valid birthday, please re-enter ');
document.getElementById (' Card_no '). focus ();
return false;
}
Detection of Test bit
if (checkparity (card) = = False)
{
Alert (' Your ID check bit is incorrect, please re-enter ');
document.getElementById (' Card_no '). focus ();
return false;
}
Alert (' OK ');
return true;
};


Check if the number is compliant, including length, type
Iscardno = function (card)
{
The ID number is 15 digits or 18 digits, 15 digits are all digits, 18 digits, the first 17 digits, and the last is a check digit, possibly a number or a character X
var reg =/(^d{15}$) | (^d{17} (d| X) $)/;
if (reg.test (card) = = False)
{
Alert ("Demo");
return false;
}

return true;
};

Take ID card Two, check the province
Checkprovince = function (card)
{
var province = Card.substr (0,2);
if (vcity[province] = = undefined)
{
return false;
}
return true;
};

Check if birthdays are correct
Checkbirthday = function (card)
{
var len = card.length;
ID 15, the order for the province (3) city (3-bit) year (2-bit) month (2-bit) (2-bit) (3-digit) check digit
if (len = = ' 15 ')
{
var re_fifteen =/^ (D{6}) (D{2}) (D{2}) (d{2}) d{3;
var arr_data = Card.match (Re_fifteen);
var year = arr_data[2];
var month = arr_data[3];
var day = arr_data[4];
var birthday = new Date (' +year+ '/' +month+ '/' +day);
Return Verifybirthday (' +year,month,day,birthday ');
}
ID 18, the order for the province (3-bit) City (3-bit) year (4-bit) month (2-bit) (2-bit) check bit (4 bit), the check digit end may be X
if (len = = ' 18 ')
{
var re_eighteen =/^ (D{6}) (D{4}) (D{2}) (D{2}) (D{3}) ([0-9]| X) $/;
var arr_data = Card.match (Re_eighteen);
var year = arr_data[2];
var month = arr_data[3];
var day = arr_data[4];
var birthday = new Date (year+ '/' +month+ '/' +day);
Return Verifybirthday (Year,month,day,birthday);
}
return false;
};

Check Date
Verifybirthday = function (year,month,day,birthday)
{
var now = new Date ();
var now_year = Now.getfullyear ();
Is it reasonable to date
if (birthday.getfullyear () = = Year && (birthday.getmonth () + 1) = = Month && birthday.getdate () = = day)
{
Determine the range of year (between 3 and 100 years old)
var time = now_year-year;
if (Time >= 3 && time <= 100)
{
return true;
}
return false;
}
return false;
};

Check bit detection
checkparity = function (card)
{
15-bit ext. 18-bit
Card = Changefivteentoeighteen (card);
var len = card.length;
if (len = = ' 18 ')
{
var arrint = new Array (7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
var arrch = new Array (' 1 ', ' 0 ', ' X ', ' 9 ', ' 8 ', ' 7 ', ' 6 ', ' 5 ', ' 4 ', ' 3 ', ' 2 ');
var cardtemp = 0, I, valnum;
for (i = 0; i < i + +)
{
Cardtemp + + CARD.SUBSTR (i, 1) * arrint[i];
}
Valnum = arrch[cardtemp% 11];
if (Valnum = = Card.substr (17, 1))
{
return true;
}
return false;
}
return false;
};

15-digit ext. 18 ID Number
Changefivteentoeighteen = function (card)
{
if (card.length = ' 15 ')
{
var arrint = new Array (7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
var arrch = new Array (' 1 ', ' 0 ', ' X ', ' 9 ', ' 8 ', ' 7 ', ' 6 ', ' 5 ', ' 4 ', ' 3 ', ' 2 ');
var cardtemp = 0, I;
Card = CARD.SUBSTR (0, 6) + ' n ' + card.substr (6, card.length-6);
for (i = 0; i < i + +)
{
Cardtemp + + CARD.SUBSTR (i, 1) * arrint[i];
}
Card + + arrch[cardtemp% 11];
return card;
}
return card;
};

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