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<h1 class="visually-hidden">The CandyShop Ice Cream Parlor</h1>
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<p class="card__text">We make ice cream from the freshest cream!</p>
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<h3>Address:</h3>
<p>19/8 Bolshaya Konyushennaya, St. Petersburg, 191186</p>
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</script><link rel="stylesheet" href="https://assets.htmlacademy.org/css/core.v284.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/profile.v236.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course.v246.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course-interface-light.v20.css"><link rel="stylesheet" href="https://assets.htmlacademy.org/css/course-interface-en.v2.css"><script src="https://assets.htmlacademy.org/js/sentry.js" data-sentry="3774884cc81746ed84c0ba7c5cd4ac7b" data-project="26" data-version="2"></script><link rel="stylesheet" href="/css/custom.css"><link rel="stylesheet" href="/css/cookies.css"><link rel="preload" as="script" href="https://assets.htmlacademy.org/js/general.v274.js"><title>Choosing a key — Getting to know events — HTML Academy</title><meta name="csrf-token" content="56364caf322823086fca37a7326b9bd2a54"><meta property="og:type" content="website"><meta property="og:site_name" content="HTML Academy"><meta name="twitter:url" property="og:url" content="https://htmlacademy.org"><meta name="twitter:title" property="og:title" content="Interactive online courses HTML Academy"><meta name="twitter:description" property="og:description" content="Together we’ll learn how to work with real code, solve true-to-life problems, use cutting edge technologies. Minimum of boring theory and lots of practical tasks."><meta name="twitter:image" property="og:image" content="https://htmlacademy.org/og/htmlacademy.png"><meta name="twitter:card" content="summary_large_image"><link rel="canonical" href="https://htmlacademy.org/courses/javascript-browser/events/choose-key"><meta name="theme-color" content="#2f358f"></head><body class="course-interface course-interface--light" data-base="/assets/courses/30/"><header class="page-header page-header--course"><div class="page-header__inner"><div class="page-header__top"><a class="page-header__logo" href="/" aria-label="HTML Academy Home"><img src="https://assets.htmlacademy.org/img/logo--small.svg?cs=1218aec0be4a5f23db79ad29a14e30f7f9fb9a25" width="24" height="36" alt="HTML Academy"></a><nav class="main-nav main-nav--mini" role="navigation"><div class="main-nav__course-nav"><a class="main-nav__course-item main-nav__course-button main-nav__course-button--prev" href="/courses/javascript-browser/events/press-key">Pressing a key</a><div class="main-nav__course-item main-nav__course-list main-nav__course-list--collapsed"><b class="main-nav__course-title">Getting to know events</b><span class="main-nav__course-stat">8/25</span><div class="main-nav__course-contents"><a class="main-nav__course-contents-link" href="/courses/javascript-browser/events">Back to the list of tasks</a><ul class="main-nav__course-contents-list"><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/intro-events">1. Introduction to events</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/add-handler">2. How to add a handler</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/arrange-events">3. How events are arranged</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/default-actions">4. Default actions</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/events">5. Please pass the function</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/hide-popup">6. Hiding the popup</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/press-key">7. Pressing a key</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-browser/events/choose-key">8. Choosing a key</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/one-click">9. With one click</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/summary-1">10. Summary of “Events in JavaScript”, part 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/first-program">11. First program: “Don’t be shy”</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/photo-gallery">12. Welcome to our photo gallery</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/click-em-all">13. Click ’em all!</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/add-image">14. Adding an image</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/bug">15. A bug has crept into the system</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/scope">16. Scope</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/global-scope">17. Global scope</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/insideout-variables">18. Inside out variables</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/independent-variable">19. Becoming Independent</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/closure">20. Closures</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/school-prepare">21. Let’s prepare for school</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/fix-gallery">22. Fixing the gallery</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/heart-matter">23. Getting to the heart of the matter</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/summary-2">24. Summary of “Events in JavaScript”, part 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-browser/events/second-program">25. The Second Program: “Señor Tomato”</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/javascript-browser/events/one-click">With one click</a></div><ul class="main-nav__list main-nav__list--user main-nav__list--user-guest"><li class="main-nav__item" itemprop="name"><a class="main-nav__link" href="/signup?redirect_url=%2Fcourses%2Fjavascript-browser%2Fevents%2Fchoose-key" title="Sign up" data-modal="open" data-value="register" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg aria-hidden="true"><use xlink:href="/img/sprites/general.svg#user"></use></svg></span>Sign up</a></li><li class="main-nav__item main-nav__item--login" itemprop="name"><a class="main-nav__link" href="/login?redirect_url=%2Fcourses%2Fjavascript-browser%2Fevents%2Fchoose-key" title="Log in" data-modal="open" data-value="login" itemprop="url"><span class="main-nav__icon" aria-hidden="true"><svg aria-hidden="true"><use 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2.79-6.835-.084.354 2.613.43 4.138-1.208 1.078-1.125.446-2-.186-3.375-1.71-3.552-4.585-6.323-7.384-8.918-.716-.69-1.44-2.428-2.706-2-.995.353-.93 3.2-.716 4.073 1.09 7.448 4.065 18.263 4.065 18.263zm37.372-.78c-1.704-1.826-2.822-4.12-3.208-6.585 0 .354-2.614.354-4.056-1.29-.995-1.127-.362-1.86.363-3.117 1.86-3.198 4.863-5.718 7.746-8.136.81-.604 1.627-1.47 2.79-.93.994.428.715 2.334.548 3.115-1.083 5.72-2.48 11.376-4.183 16.943z" fill="#FFF"/><path d="M53.564 20.422c-1.98.51-4.138 1.636-5.105 3.487-.43-2.196 1.645-4.65 3.393-5.832.333-.21.312-.703-.037-.886-.162-.085-.357-.076-.512.022-2.157 1.562-4.417 4.5-3.784 7.188.076.262.354.41.614.325l-.075.28c-.085.603.93.864.994.26.446-2.158 2.706-3.376 4.77-3.897.372-.076.522-.526.27-.81-.133-.15-.342-.204-.53-.138zM17.457 18.06c-.55-.354-.995.428-.55.865 1.433 1.004 3.182 3.05 3.395 4.956-.93-1.86-3.05-2.975-5.105-3.486-.386-.005-.633.41-.445.747.042.076.103.14.176.184 2.073.52 4.324 1.73 4.77 3.896.106.328.5.46.78.26.273.192.653.06.745-.26.735-2.66-1.6-5.728-3.766-7.16z" fill="#F1662A"/></svg></span><p class="course-loading-overlay__message"><b class="course-loading-overlay__message-title">Loading…</b><br><span class="course-loading-overlay__message-text">Everything will be ready in few seconds</span></p></div></div><div class="course-layout__sidebar course-theory"><div class="course-theory__inner course-theory__inner--left-stub"><button class="course-theory__close icon-close icon-close--light" type="button">Close</button><ul class="course-tabs course-tabs--non-interactive course-layout__theory-heading js--theory-tabs"><li class="course-tabs__item course-tabs__item--external course-tab course-tab--centered"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">Choosing a key</h1><div class="course-theory__content-text"><p>We called the event, and it is triggered when we press any key. But any key won’t do. We need to use <code>ESC</code>. How can we execute the code by pressing just one specific key? Let’s turn our attention to the <code>event</code> object, which we are already familiar with.</p><p>We <a href="/courses/javascript-browser/events/default-actions">previously</a> mentioned that the event object has many useful properties. For example, the event type, entered character, the cursor coordinates at the time the event occurred, and much more. These also include the code of the key that the user pressed. This property is called <code>keyCode</code>.</p><p>We can use this property to identify every key by code. For example, <code>Enter</code> has the code <code>13</code>, whereas <code>ESC</code> has the code <code>27</code>. These numbers are universal and the same for any layout. You can find the code for any key <a href="https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode" target="_blank" rel="noopener">here</a>.</p><p>We now know that we have the <code>event</code> object, which contains the number of the pressed key in the <code>keyCode</code> property, and we know the code of the desired key. The only thing left to do is collect all of this information into a single handler.</p><pre><code>document.addEventListener('keydown', function(<mark>evt</mark>) {
// Let's check that the key code is equal to 27.
if (<mark>evt.keyCode === 27</mark>) {
// The code is only executed when ESC is pressed.
}
});
</code></pre><p>Let’s configure our handler so that the instructions are executed only when <code>ESC</code> is pressed.</p><div class="info info--gray"><span class="info__heading">By the way,</span><p>there are other properties besides <code>keyCode</code> for determining the pressed key. There is <a href="https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key" target="_blank" rel="noopener">key</a>, for example. It is different due to the fact that it doesn’t return the key code, but rather its name in the form of a string: “Enter”, “Alt”, and “Escape”. We also have the <a href="https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code" target="_blank" rel="noopener">code</a> property. It also returns the name of the key. In this case, the selected keyboard language does not have any influence on the value. These properties are not yet supported in all browsers, but when they are implemented more widely, you should start using them instead of the <code>keyCode</code> in accordance with the modern JavaScript standard.</p></div></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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</script><noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript></div></div></section><div class="course-theory__controls"><button class="button button--close" type="button">To the task</button></div></div></div><div class="course-layout__column course-layout__column--left"><ul class="js--course-tabs course-tabs course-layout__course-tabs"><li class="js--editor-tab course-tabs__item course-tab course-tabs__item--limited course-tabs__item--limited-large course-tab--active" data-editor="html"><span class="course-tab__title course-tab__title--indent"><span class="course-tab__title-part course-tab__title-part--active">index.html</span></span><button class="js--editor-split course-tab__button course-tab__button--split" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-split"></use></svg><span class="tooltip tooltip--light tooltip--to-top tooltip--with-wrap tooltip--short course-tab__tooltip"><span class="tooltip__wrap">Split mode</span></span></button></li><li class="js--editor-tab course-tabs__item course-tab course-tabs__item--limited course-tabs__item--limited-large" data-editor="css"><span class="course-tab__title course-tab__title--indent"><span class="course-tab__title-part course-tab__title-part--active">style.css</span></span><button class="js--editor-split course-tab__button course-tab__button--split" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-split"></use></svg><span class="tooltip tooltip--light tooltip--to-top tooltip--with-wrap tooltip--short course-tab__tooltip"><span class="tooltip__wrap">Split mode</span></span></button></li><li class="js--editor-tab course-tabs__item course-tab course-tabs__item--limited course-tabs__item--limited-large" data-editor="js"><span class="course-tab__title course-tab__title--indent"><span class="course-tab__title-part course-tab__title-part--active">script.js</span></span><button class="js--editor-split course-tab__button course-tab__button--split" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-split"></use></svg><span class="tooltip tooltip--light tooltip--to-top tooltip--with-wrap tooltip--short course-tab__tooltip"><span class="tooltip__wrap">Split mode</span></span></button></li></ul><div class="course-layout__editors"><div class="js--editor course-editor course-layout__editor" id="" data-tab="html" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">HTML</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="html-editor"><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>CandyShop</title>
<link href="candy-shop/setting.css" rel="stylesheet">
<link href="style.css" rel="stylesheet">
</head>
<body>
<section class="card">
<div class="card__content">
<h1 class="visually-hidden">The CandyShop Ice Cream Parlor</h1>
<img class="card__logo" src="candy-shop/candyshop.svg" width="205" height="63" alt="The CandyShop">
<p class="card__text">We make ice cream from the freshest cream!</p>
<img class="card__img" src="candy-shop/icecream.png" width="196" height="240" alt="Ice cream">
</div>
<div class="card__controls">
<a href="contacts.html" class="card__button button-open">Show contacts</a>
</div>
</section>
<section class="modal modal--show">
<div class="modal__content">
<h2 class="visually-hidden">Contact us</h2>
<h3>Address:</h3>
<p>19/8 Bolshaya Konyushennaya, St. Petersburg, 191186</p>
<h3>Phone:</h3>
<p>+7 (812) 275-75-75</p>
<h3>Email:</h3>
<p>mail@htmlacademy.ru</p>
<button class="modal__button button-close" type="button">Close</button>
</div>
</section>
<script src="script.js"></script>
</body>
</html>
</div></div><div class="js--editor course-editor course-layout__editor course-editor--hidden" id="" data-tab="css" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">CSS</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="css-editor">h3 {
margin: 0.5em 0;
}
p {
margin: 0.5em 0 2em;
}
.card {
width: 420px;
margin: 50px auto 0;
}
.card__content {
position: relative;
background-color: #fad400;
display: flex;
flex-direction: column;
align-items: flex-start;
padding-top: 15px;
padding-left: 20px;
box-shadow: 0 5px 8px 0 #e8e8e8;
}
.card__img {
align-self: flex-end;
margin-top: auto;
}
.card__logo {
position: absolute;
}
.card__text {
font-size: 16px;
line-height: 22px;
font-weight: bold;
position: absolute;
left: 20px;
top: 100px;
width: 190px;
}
.card__controls {
display: flex;
justify-content: center;
align-items: center;
border: 2px solid #e8e8e8;
border-top: 0;
border-bottom-right-radius: 10px;
border-bottom-left-radius: 10px;
padding-top: 20px;
padding-bottom: 20px;
}
.card__button {
border: 0;
padding: 12px 0;
width: 230px;
text-transform: uppercase;
text-align: center;
border-radius: 50px;
color: #ffffff;
font-weight: bold;
font-size: 16px;
text-decoration: none;
background-color: #fad400;
}
.card__button:hover,
.card__button:focus {
background-color: #82da03;
}
.card__button:active {
color: rgba(255, 255, 255, 0.3);
background-color: #6cb502;
}
.modal {
display: none;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
.modal--show {
display: block;
}
.modal::after {
content: "";
position: fixed;
top: 0;
left: 0;
height: 100%;
width: 100%;
background-color: rgba(0, 0, 0, 0.3);
z-index: 1;
}
.modal__content {
position: relative;
width: 300px;
margin: 100px auto;
padding: 30px 70px 15px;
background-color: #ffffff;
box-shadow: -1px 5px 12px 0 rgba(89, 90, 90, 0.3);
z-index: 2;
}
.modal__button {
position: absolute;
top: 20px;
right: 20px;
width: 20px;
height: 20px;
font-size: 0;
background: none;
border: 0;
}
.modal__button::after,
.modal__button::before {
content: "";
position: absolute;
right: 0;
top: 20px;
width: 26px;
height: 6px;
margin: -13px -3px;
background-color: #7656de;
}
.modal__button::before {
transform: rotate(45deg);
}
.modal__button::after {
transform: rotate(-45deg);
}
.modal__button:hover::after,
.modal__button:hover::before,
.modal__button:focus::after,
.modal__button:focus::before {
background-color: #9b7ff7;
}
.modal__button:active::after,
.modal__button:active::before {
background-color: #4023a0;
}
.visually-hidden {
position: absolute;
width: 1px;
height: 1px;
margin: -1px;
border: 0;
padding: 0;
white-space: nowrap;
clip-path: inset(100%);
clip: rect(0 0 0 0);
overflow: hidden;
}
</div></div><div class="js--editor course-editor course-layout__editor course-editor--hidden" id="" data-tab="js" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">JavaScript</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="js-editor">var popup = document.querySelector('.modal');
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});
</div></div></div><div class="course-editor-controls"><button class="course-editor-controls__item course-editor-controls__item--answer" type="button">Show the answer</button></div><div class="js--feedback course-unhappy"><button class="js--feedback-btn course-unhappy__button" type="button"><span class="sr-only">Complain</span><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#unhappy"></use></svg></button><div class="js--feedback-modal course-unhappy__modal course-unhappy__modal--step-one"><form method="POST" action="/courses/javascript-browser/events/choose-key/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aebbe7dc514"><input type="hidden" name="csrf_value" value="d9240fdeaa3d2d1de1e1992e9a5151b2"><p class="course-unhappy__text">What didn’t you like in this task?</p><div class="course-unhappy__slide"><div class="course-unhappy__wrap"><div class="course-unhappy__list"><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="1" type="checkbox"><span class="checkbox__text">The code check doesn’t work</span></label><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="2" type="checkbox"><span class="checkbox__text">The task is too difficult</span></label><label class="checkbox checkbox--small"><input class="checkbox__input" name="problems" value="3" type="checkbox"><span class="checkbox__text">The theory is hard to understand</span></label><label class="checkbox checkbox--small"><input class="js--feedback-other-checkbox checkbox__input" name="problems" value="0" type="checkbox"><span class="checkbox__text">Other (will write below)</span></label></div><div class="course-unhappy__message"><label class="sr-only" for="id-message">Другое (сейчас напишу)</label><textarea class="field field--area" id="id-message" name="message" placeholder="For example, a typo in the word «heading»"></textarea></div></div></div><button class="course-unhappy__control course-unhappy__control--prev" type="button"><span class="sr-only">Prev</span><svg aria-hidden="true"><use xlink:href="/img/sprites/landings.svg#arrow"></use></svg></button><button class="course-unhappy__control course-unhappy__control--next" type="button" disabled><span class="sr-only">Next</span><svg aria-hidden="true"><use xlink:href="/img/sprites/landings.svg#arrow"></use></svg></button><button class="js--submit-btn button" disabled>Submit</button></form><p class="course-unhappy__result hidden">Thanks! We’ll fix everything at once!</p></div></div></div><div class="course-layout__column course-layout__column--right"><span class="course-separator-control"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-arrows-separator"></use></svg></span><div class="course-browser course-layout__browser"><div class="course-browser__menu"><span class="course-browser__menu-item course-browser__address"><span class="course-browser__menu-item-inner"><span class="course-browser__address-text"></span></span></span><button class="js--autorun course-browser__menu-item course-browser__menu-button course-browser__menu-button--text-with-icon course-browser__menu-button--autorun course-browser__menu-button--autorun-on" title="Autorun" type="button"><span class="course-browser__menu-item-inner"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-autorun"></use></svg>
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