iban.js

/**
 * IBAN is the international bank account number.
 * It has a country - specific format, that is checked here too
 *
 * Validation is case-insensitive. Please make sure to normalize input yourself.
 */
$.validator.addMethod( "iban", function( value, element ) {

	// Some quick simple tests to prevent needless work
	if ( this.optional( element ) ) {
		return true;
	}

	// Remove spaces and to upper case
	var iban = value.replace( / /g, "" ).toUpperCase(),
		ibancheckdigits = "",
		leadingZeroes = true,
		cRest = "",
		cOperator = "",
		countrycode, ibancheck, charAt, cChar, bbanpattern, bbancountrypatterns, ibanregexp, i, p;

	// Check for IBAN code length.
	// It contains:
	// country code ISO 3166-1 - two letters,
	// two check digits,
	// Basic Bank Account Number (BBAN) - up to 30 chars
	var minimalIBANlength = 5;
	if ( iban.length < minimalIBANlength ) {
		return false;
	}

	// Check the country code and find the country specific format
	countrycode = iban.substring( 0, 2 );
	bbancountrypatterns = {
		"AL": "\\d{8}[\\dA-Z]{16}",
		"AD": "\\d{8}[\\dA-Z]{12}",
		"AT": "\\d{16}",
		"AZ": "[\\dA-Z]{4}\\d{20}",
		"BE": "\\d{12}",
		"BH": "[A-Z]{4}[\\dA-Z]{14}",
		"BA": "\\d{16}",
		"BR": "\\d{23}[A-Z][\\dA-Z]",
		"BG": "[A-Z]{4}\\d{6}[\\dA-Z]{8}",
		"CR": "\\d{17}",
		"HR": "\\d{17}",
		"CY": "\\d{8}[\\dA-Z]{16}",
		"CZ": "\\d{20}",
		"DK": "\\d{14}",
		"DO": "[A-Z]{4}\\d{20}",
		"EE": "\\d{16}",
		"FO": "\\d{14}",
		"FI": "\\d{14}",
		"FR": "\\d{10}[\\dA-Z]{11}\\d{2}",
		"GE": "[\\dA-Z]{2}\\d{16}",
		"DE": "\\d{18}",
		"GI": "[A-Z]{4}[\\dA-Z]{15}",
		"GR": "\\d{7}[\\dA-Z]{16}",
		"GL": "\\d{14}",
		"GT": "[\\dA-Z]{4}[\\dA-Z]{20}",
		"HU": "\\d{24}",
		"IS": "\\d{22}",
		"IE": "[\\dA-Z]{4}\\d{14}",
		"IL": "\\d{19}",
		"IT": "[A-Z]\\d{10}[\\dA-Z]{12}",
		"KZ": "\\d{3}[\\dA-Z]{13}",
		"KW": "[A-Z]{4}[\\dA-Z]{22}",
		"LV": "[A-Z]{4}[\\dA-Z]{13}",
		"LB": "\\d{4}[\\dA-Z]{20}",
		"LI": "\\d{5}[\\dA-Z]{12}",
		"LT": "\\d{16}",
		"LU": "\\d{3}[\\dA-Z]{13}",
		"MK": "\\d{3}[\\dA-Z]{10}\\d{2}",
		"MT": "[A-Z]{4}\\d{5}[\\dA-Z]{18}",
		"MR": "\\d{23}",
		"MU": "[A-Z]{4}\\d{19}[A-Z]{3}",
		"MC": "\\d{10}[\\dA-Z]{11}\\d{2}",
		"MD": "[\\dA-Z]{2}\\d{18}",
		"ME": "\\d{18}",
		"NL": "[A-Z]{4}\\d{10}",
		"NO": "\\d{11}",
		"PK": "[\\dA-Z]{4}\\d{16}",
		"PS": "[\\dA-Z]{4}\\d{21}",
		"PL": "\\d{24}",
		"PT": "\\d{21}",
		"RO": "[A-Z]{4}[\\dA-Z]{16}",
		"SM": "[A-Z]\\d{10}[\\dA-Z]{12}",
		"SA": "\\d{2}[\\dA-Z]{18}",
		"RS": "\\d{18}",
		"SK": "\\d{20}",
		"SI": "\\d{15}",
		"ES": "\\d{20}",
		"SE": "\\d{20}",
		"CH": "\\d{5}[\\dA-Z]{12}",
		"TN": "\\d{20}",
		"TR": "\\d{5}[\\dA-Z]{17}",
		"AE": "\\d{3}\\d{16}",
		"GB": "[A-Z]{4}\\d{14}",
		"VG": "[\\dA-Z]{4}\\d{16}"
	};

	bbanpattern = bbancountrypatterns[ countrycode ];

	// As new countries will start using IBAN in the
	// future, we only check if the countrycode is known.
	// This prevents false negatives, while almost all
	// false positives introduced by this, will be caught
	// by the checksum validation below anyway.
	// Strict checking should return FALSE for unknown
	// countries.
	if ( typeof bbanpattern !== "undefined" ) {
		ibanregexp = new RegExp( "^[A-Z]{2}\\d{2}" + bbanpattern + "$", "" );
		if ( !( ibanregexp.test( iban ) ) ) {
			return false; // Invalid country specific format
		}
	}

	// Now check the checksum, first convert to digits
	ibancheck = iban.substring( 4, iban.length ) + iban.substring( 0, 4 );
	for ( i = 0; i < ibancheck.length; i++ ) {
		charAt = ibancheck.charAt( i );
		if ( charAt !== "0" ) {
			leadingZeroes = false;
		}
		if ( !leadingZeroes ) {
			ibancheckdigits += "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".indexOf( charAt );
		}
	}

	// Calculate the result of: ibancheckdigits % 97
	for ( p = 0; p < ibancheckdigits.length; p++ ) {
		cChar = ibancheckdigits.charAt( p );
		cOperator = "" + cRest + "" + cChar;
		cRest = cOperator % 97;
	}
	return cRest === 1;
}, "Please specify a valid IBAN." );