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_site/luhn-algorithm/index.html
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167
_site/luhn-algorithm/index.html
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no">
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<meta name="HandheldFriendly" content="True">
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<link rel="icon" sizes="192x192" href="https://mgrove.uk/logo.png">
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<meta name="mobile-web-app-capable" content="yes">
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<link rel="icon" sizes="192x192" href="https://mgrove.uk/logo.png">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<meta name="apple-mobile-web-app-status-bar-style" content="black">
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<meta name="apple-mobile-web-app-title" content="Luhn Algorithm | Matthew Grove">
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<link rel="apple-touch-icon-precomposed" href="https://mgrove.uk/logo.png">
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<!-- tile icon & colour for Windows 8 -->
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<meta name="msapplication-TileImage" content="https://mgrove.uk/logo.png">
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<meta name="msapplication-TileColor" content="#d84315">
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<title>Luhn Algorithm | Matthew Grove</title>
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<meta name="description" content="Replication of the Luhn algorithm - by Matthew Grove">
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<!-- import Roboto (font) -->
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<link href="/css/roboto.css" rel="stylesheet" type="text/css">
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<!-- import jQuery -->
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<script src="/js/jquery.min.js" type="text/javascript"></script>
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<!-- import cookie JavaScript -->
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<script src="/js/cookies.js" type="text/javascript"></script>
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<!-- import Material Design components & icons -->
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<link href="/css/material-components-web.min.css" rel="stylesheet" type="text/css">
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<link href="/css/material_icons.css" rel="stylesheet" type="text/css">
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<script src="/js/material-components-web.min.js" type="text/javascript"></script>
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<!-- import local styling & scripts -->
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<script src="/js/global.js" type="text/javascript"></script>
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<link href="/css/global.css" rel="stylesheet" type="text/css">
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<!-- Global site tag (gtag.js) - Google Analytics -->
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<script async src="https://www.googletagmanager.com/gtag/js?id=UA-124505000-1" type="text/javascript"></script>
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<script type="text/javascript">
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window.dataLayer = window.dataLayer || [];
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function gtag(){dataLayer.push(arguments);}
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gtag('js', new Date());
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gtag('config', 'UA-124505000-1');
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</script>
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</head>
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<body>
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<!-- cookie notice is included automatically -->
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<div id="cookies">
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<p>Just to let you know, I use cookies on my site.</p>
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<p><a href="javascript:void(0);" id="close-cookies">OK</a></p>
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</div>
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<!-- content of navbar is included automatically -->
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<aside class="navbar-insert mdc-drawer mdc-drawer--modal">
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<div class="mdc-drawer__content">
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<div style="margin: 15px;text-align:center;">
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<img src="https://mgrove.uk/logo.png" style="width: 90%;"/>
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</div>
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<div class="mdc-list">
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<a class="mdc-list-item" href="https://blog.mgrove.uk">
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<i class="material-icons mdc-list-item__graphic" aria-hidden="true">assignment</i>
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<span class="mdc-list-item__text">My Blog</span>
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</a>
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<a class="mdc-list-item" href="/">
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<i class="material-icons mdc-list-item__graphic" aria-hidden="true">home</i>
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<span class="mdc-list-item__text">Home Page</span>
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</a>
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<a class="mdc-list-item" href="/luhn-algorithm/">
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<i class="material-icons mdc-list-item__graphic" aria-hidden="true">credit_card</i>
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<span class="mdc-list-item__text">Luhn Algorithm</span>
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</a>
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<a class="mdc-list-item" href="/svalbard/">
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<i class="material-icons mdc-list-item__graphic" aria-hidden="true">ac_unit</i>
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<span class="mdc-list-item__text">Svalbard</span>
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</a>
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<a class="mdc-list-item" href="/computer-science-blog/">
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<i class="material-icons mdc-list-item__graphic" aria-hidden="true">code</i>
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<span class="mdc-list-item__text">GCSE Computer Science Blog</span>
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</a>
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</div>
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</div>
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</aside>
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<div class="mdc-drawer-scrim"></div>
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<div class="mdc-drawer-app-content">
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<header class="mdc-top-app-bar app-bar" id="app-bar">
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<div class="mdc-top-app-bar__row">
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<section class="mdc-top-app-bar__section mdc-top-app-bar__section--align-start">
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<a href="javascript:void(0);" class="demo-mensu material-icons mdc-top-app-bar__navigation-icon">menu</a>
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<span class="mdc-top-app-bar__title">Luhn Algorithm | Matthew Grove</span>
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</section>
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</div>
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</header>
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<main class="main-content" id="main-content">
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<div class="mdc-top-app-bar--fixed-adjust">
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<link href="style.css" rel="stylesheet" type="text/css" />
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<script src="script.js" type="text/javascript"></script>
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<h1 id="validate-your-number">Validate Your Number</h1>
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<!-- input field (in a container so that unwanted overflow from :before & :after is hidden) -->
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<div class="mdc-text-field-container">
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<div class="mdc-text-field mdc-text-field--outlined" data-mdc-auto-init="MDCTextField">
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<input type="number" id="number-input-field" class="mdc-text-field__input" />
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<label for="number-input-field" class="mdc-floating-label ">Number</label>
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<div class="mdc-notched-outline">
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<svg>
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<path class="mdc-notched-outline__path" />
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</svg>
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</div>
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<div class="mdc-notched-outline__idle"></div>
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</div>
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<!-- input field helper text -->
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<p class="mdc-text-field-helper-text" aria-hidden="true">
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Validate with the Luhn Algorithm
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</p>
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</div>
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<!-- button to submit & check number with Luhn algorithm -->
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<p><button class="validation_button mdc-button mdc-button--outlined" onclick="checkNumber()" data-mdc-auto-init="MDCRipple">
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<i class="material-icons mdc-button__icon">check_circle_outline</i>
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Check
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</button>
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<!-- displays evaluation of number by Luhn algorithm --></p>
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<p id="validation_message"></p>
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<!-- link to source code on GitHub -->
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<a href="https://github.com/mgrove36/demo-code/tree/master/luhn-algorithm/" class="source-code-link mdc-fab mdc-fab--extended" data-mdc-auto-init="MDCRipple">
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<span class="material-icons mdc-fab__icon">rate_review</span>
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<span class="mdc-fab__label">View on GitHub</span>
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</a>
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</div>
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</main>
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<footer>
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© Matthew Grove 2019
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</footer>
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</div>
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</body>
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</html>
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34
_site/luhn-algorithm/script.js
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34
_site/luhn-algorithm/script.js
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document.addEventListener("keyup", function(event) {
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// stop any code that may normally run when enter key pressed
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event.preventDefault();
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// if enter key is pressed, run Luhn algorithm
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if (event.keyCode === 13) {
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checkNumber();
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} else {
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// if number in input field is being edited, remove previous number evaluation message
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$("#validation_message").html(null);
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}
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});
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// function for validating number entered with Luhn algorithm
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function checkNumber() {
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// define input string and remove non-numerical characters
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var input = document.getElementsByTagName("input")[0].value.replace(/\D/g,'');;
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// check string isn't empty
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if (input) {
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// retrieve digits & reverse
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var digits = document.getElementsByTagName("input")[0].value.split("").reverse(), sum = 0;
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digits.forEach(function(currentDigit, index) {
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newDigit = Number(currentDigit);
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if (index % 2 == 1) {
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if ((newDigit *= 2) > 9) {
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newDigit -= 9;
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}
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}
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sum += newDigit;
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});
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// displays evaluation message
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$("#validation_message").html(((sum % 10) == 0) ? "Number is valid" : "Number is invalid");
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}
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}
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3
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3
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.mdc-text-field-helper-text {
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margin: 0;
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}
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