Check IBAN

Created by MaVRoSCy

by javad ebrahimi

HTML

Enter IBAN 
<input type="test" id="iban"/>
<button onclick="alertValidIBAN(null);">check IBAN</button>

CSS

input{width:300px;}

JavaScript

function alertValidIBAN(iban) {
    		if(iban==null){
        	alert(isValidIBANNumber(document.getElementById("iban").value));
        }else{
        	alert(isValidIBANNumber(iban));
       	}
    }
    /*
     * Returns 1 if the IBAN is valid 
     * Returns FALSE if the IBAN's length is not as should be (for CY the IBAN Should be 28 chars long starting with CY )
     * Returns any other number (checksum) when the IBAN is invalid (check digits do not match)
     */
    function isValidIBANNumber(value) {
        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":...