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<!DOCTYPE html>
<html>
<head>
<title>IBAN Check</title>
<meta charset="utf8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="author" content="Florian Fischer">
<style>
:root {
/* define applied colors */
--bg: #fdfdfd;
--fg: #1a1a1a;
--link-color: #0000EE;
}
@media (prefers-color-scheme: dark) {
/* change apllied colors to the dark gruvbox pallet
* https://github.com/morhetz/gruvbox
*/
:root {
--bg: #282828; /* dark bg */
--fg: #ebdbb2; /* dark fg */
--link-color: #d79921; /* yellow */
}
}
html {
line-height: 1.5;
font-family: Georgia, serif;
font-size: 20px;
color: var(--fg);
background-color: var(--bg);
}
body {
margin: 0 auto;
max-width: 36em;
padding-left: 50px;
padding-right: 50px;
padding-top: 50px;
padding-bottom: 50px;
hyphens: auto;
word-wrap: break-word;
text-rendering: optimizeLegibility;
font-kerning: normal;
}
footer {
position:absolute;
bottom: 0;
}
a {
color: var(--link-color);
}
a:visited {
color: var(--link-color);
}
@media (max-width: 600px) {
body {
font-size: 0.9em;
padding: 1em;
}
}
</style>
<script language="javascript" type="text/javascript">
/*
@licstart The following is the entire license notice for the
JavaScript code in this page.
Copyright (C) 2024 Florian Fischer
The JavaScript code in this page is free software: you can
redistribute it and/or modify it under the terms of the GNU
General Public License (GNU GPL) as published by the Free Software
Foundation, either version 3 of the License, or any later version.
The code is distributed WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
As additional permission under GNU GPL version 3 section 7, you
may distribute non-source (e.g., minimized or compacted) forms of
that code without the copy of the GNU GPL normally required by
section 4, provided you include this license notice and a URL
through which recipients can access the Corresponding Source.
@licend The above is the entire license notice
for the JavaScript code in this page.
*/
// return IBAN without spaces
function normalizeIban(ibanInput) {
return ibanInput.replaceAll(" ", "");
}
const ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
// return True if the IBAN is valid
function checkIban(ibanInput) {
try {
let ibanStr = normalizeIban(ibanInput);
let countryCode1 = ALPHABET.indexOf(ibanStr.charAt(0).toUpperCase()) + 10;
let countryCode2 = ALPHABET.indexOf(ibanStr.charAt(1).toUpperCase()) + 10;
let checkDigits = parseInt(ibanStr.substring(2, 4));
let bban = ibanStr.substring(4);
let ibanToCheck = BigInt(bban + countryCode1 + countryCode2 + "00");
let calculatedCheckDigits = 98 - Number(ibanToCheck % BigInt("97"));
return checkDigits == calculatedCheckDigits;
}
catch (e) {
return false;
}
}
function visualizeIbanCheck(ibanInput) {
try {
let ibanStr = normalizeIban(ibanInput);
let countryCode1 = ALPHABET.indexOf(ibanStr.charAt(0).toUpperCase()) + 10;
let countryCode2 = ALPHABET.indexOf(ibanStr.charAt(1).toUpperCase()) + 10;
let bban = ibanStr.substring(4);
let ibanToCheck = BigInt(bban + countryCode1 + countryCode2 + "00");
let calculatedCheckDigits = 98 - Number(ibanToCheck % BigInt("97"));
document.getElementById('iban_check_visualisation_details').style.display = "initial";
let vis = document.getElementById('iban_check_visualisation');
// Clear last visualisation
vis.innerHTML = "";
// Add some text to the new cells:
let equTxt = document.createElement("span");
equTxt.innerHTML = "98 - (";
vis.appendChild(equTxt);
let bbanTxt = document.createElement("span");
bbanTxt.innerHTML = bban;
bbanTxt.style.borderStyle="solid";
bbanTxt.style.borderColor="red";
vis.appendChild(bbanTxt);
let ccTxt = document.createElement("span");
ccTxt.innerHTML = "" + countryCode1 + countryCode2;
ccTxt.style.borderStyle="solid";
ccTxt.style.borderColor="orange";
vis.appendChild(ccTxt);
let calcTxt = document.createElement("span");
calcTxt.innerHTML = "00 % 97) = 98 - ";
vis.appendChild(calcTxt);
let modRes = Number(ibanToCheck % BigInt("97"));
let modResTxt = document.createElement("span");
modResTxt.innerHTML = "" + modRes;
vis.appendChild(modResTxt);
let equEndTxt = document.createElement("span");
equEndTxt.innerHTML = " = ";
vis.appendChild(equEndTxt);
let cdTxt = document.createElement("span");
cdTxt.innerHTML = "" + calculatedCheckDigits;
if (parseInt(ibanStr.substring(2, 4)) == calculatedCheckDigits) {
cdTxt.style.color="green";
} else {
cdTxt.style.color="red";
}
vis.appendChild(cdTxt);
}
catch (e) {
return;
}
}
document.addEventListener('DOMContentLoaded', function() {
let result = document.getElementById("result");
document.getElementById("iban_check_form").onsubmit = function() {
let ibanInput = document.getElementById('iban').value;
if (checkIban(ibanInput)) {
result.innerHTML = "valid ✔";
} else {
result.innerHTML = "invalid ✘";
}
visualizeIbanCheck(ibanInput);
return false;
}
});
</script>
</head>
<body>
<h2>IBAN Check</h2>
<div>
<form id="iban_check_form">
IBAN:
<input id="iban" type="text"/>
<!-- non visual submit input to submit on "Enter" -->
<input type="submit" style="display: none" />
<input id="iban_check_button" value="check" type="submit">
</code>
</form>
</div>
<div id="result">
</div>
<details id="iban_check_visualisation_details" style="display: none">
<summary>Visualisierung</summary>
<div id="iban_check_visualisation">
</details>
<footer>
<p xmlns:cc="http://creativecommons.org/ns#">Diese Seite von <span property="cc:attributionName">Florian Fischer</span> ist unter folgender Lizenz veröffentlicht: <a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1" target="_blank" rel="license noopener noreferrer" style="display:inline-block;">CC BY-SA 4.0<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/cc.svg?ref=chooser-v1" alt=""><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/by.svg?ref=chooser-v1" alt=""><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/sa.svg?ref=chooser-v1" alt=""></a></p>
</footer>
</body>
</html>
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