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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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</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>Please pass the function — Getting to know events — HTML Academy</title><meta name="csrf-token" content="56064caf322823086fca37a7326b9bd2a54"><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. 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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 main-nav__course-contents-item--current"><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"><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. 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fill="#EFA75B"/><path d="M31.963 50.968c-.197-.004-.358-.157-.372-.353-.018-.207.158-.378.364-.354 3.245-.26 3.505-2.156 3.608-2.25-.006-.19.183-.325.362-.26.193.01.35.16.363.354 0 .084 0 1.906 3.422 2 .192.008.348.16.362.353-.018.19-.172.34-.363.353-1.352.11-2.68-.4-3.61-1.386-.095-.096-.16-.22-.185-.353-.982 1.174-2.423 1.866-3.952 1.898z" fill="#151841"/><path d="M32.14 43.427c.186-.52 3.608.083 3.608.083s2.975-.688 3.422.084c-.05.288-.175.557-.363.78-.515-.056-1.037.004-1.525.178-.333.61-.488 1.304-.446 2-.222.394-.574.7-.995.864-.398-.112-.75-.354-.994-.688.047-.75-.146-1.496-.55-2.13-.27-.26-1.264.084-1.626-.083l-.53-1.088zm6.89.242c-.05.286-.175.556-.363.78-.503-.063-1.015-.012-1.497.148-.333.612-.487 1.305-.446 2-.222.394-.574.7-.995.864-.4-.112-.75-.354-.996-.688.053-.76-.14-1.515-.55-2.157-.268-.26-1.263.084-1.626-.084-.26-.23-.45-.53-.55-.864" fill="#CF4A27"/><path d="M35.748 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2.334.725-.13.837-1.46.93-2.13h.112c.937.492 1.647 1.33 1.98 2.334-.388.176-.793.31-1.21.4zm18.365-2.864c-1.104-.145-2.215-.232-3.33-.26-.546-.01-1.093.05-1.626.176-1.166.483-2.08 1.425-2.53 2.604l-.158.79 1.795.623c.558.153 1.132.24 1.71.26h.28c3.245-.177 4.137-3.72 4.137-3.72l.084-.353zm-1.264 1.86c-.54 1.394-2.882 1.646-2.966 1.646-.517-.02-1.03-.11-1.525-.26-.186-.085-.633-.26-1.08-.43.374-.966 1.117-1.746 2.065-2.165 0 .68.158 1.953.81 2.083.65.13.613-1.535.566-2.26.934.005 1.865.064 2.79.177-.11.316-.473.65-.66 1.17z" fill="#151841"/><path d="M19.26 39.27c.535 1.362 1.56 2.473 2.874 3.115.534.312 1.204-.07 1.207-.69.002-.285-.15-.55-.397-.695-.918-.46-1.65-1.222-2.073-2.158-.344-.957-1.972-.52-1.61.428zm29.45 3.125c1.083-.59 2.01-1.428 2.706-2.446.3-.556-.112-1.228-.743-1.21-.293.007-.56.17-.698.428-.568.776-1.306 1.412-2.158 1.86-.394.23-.517.742-.27 1.125.263.376.773.482 1.163.242z" fill="#EFA75B" stroke-width="13"/><path d="M16.025 32.436c1.525-1.386 2.427-4.408 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">Please pass the function</h1><div class="course-theory__content-text"><p>Currently the link doesn’t work, and we can replace the console output by adding the <code class="nowrap">modal--show</code> class to the element from the <code>popup</code> variable.</p><p>We have already figured out the syntax for events and the <code>event</code> object, but there is something else that we have not yet discussed. Perhaps the code for adding a handler struck you as unusual.</p><pre><code>button.addEventListener('click', <mark>function () {
// Instructions
}</mark>);
</code></pre><p>We pass one function as a parameter to another function, <code>addEventListener</code>. This type of code may surprise you, but it is in fact common practice. JavaScript allows you to do this. Moreover, you <a href="/courses/javascript-programming/functions/function-call">already</a> know how to pass functions to other functions!</p><pre><code>var getString = function () {
return 'Greetings from the function!';
}
console.log(getString); // Outputs the function code
console.log(getString<mark>()</mark>); // Outputs: Greetings from the function!
</code></pre><p>We passed the function and function call to <code class="nowrap">console.log</code>. After all, <code class="nowrap">console.log()</code> is also a function!</p><p>In the case of the handler, we do the same thing. It is just that in this case we don’t write a function to a variable.</p><pre><code>console.log(function () {
return 'Greetings from the function!';
});
// Outputs the function code
console.log(function () {
return 'Greetings from the function!';
}<mark>()</mark>);
// Outputs: Greetings from the function!
</code></pre><p>This type of function does not have its own name, and it is not written as a variable. We write it exactly where we can pass it to another function. These functions that are created at the moment that they are passed and do not have a name are called <i>anonymous functions</i>.</p><p>Pay particular attention to the most important part: we <b>pass the function</b> to handlers, but <b> we do not call</b> this function. If we call the handler, its code will be executed immediately, and our instructions will not be executed at the right moment. The code will be executed only once at the time when it is called, and it will not be executed again. This is a common mistake, but this approach is nevertheless wrong.</p><pre><code>// This is the wrong way of adding a handler
button.addEventListener('click', function () {
console.log('Button click');
}<mark>()</mark>);
// The following message is immediately output to the console: Button click
</code></pre><p>Generally speaking, JavaScript executes a program sequentially, command by command. However, this principle does not apply to events. The fact is that events do not occur sequentially or synchronously. We can configure the handler, but the instructions are not executed immediately. They are only triggered when the event occurs. This can happen 5 or 10 minutes after the website is opened, or maybe the user does not click on the link or button at all. In that case, the event will not be triggered. Events are <b>asynchronous</b>, that is, they do not occur according to a schedule at a particular time, one after another, but only when they are needed. This is the main advantage of events.</p><p>Let’s modify our code so that a popup appears on the page after the user clicks on the <code>"Show contacts"</code> button.</p></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">
<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');
var openPopupButton = document.querySelector('.button-open');
openPopupButton.addEventListener('click', function (evt) {
evt.preventDefault();
console.log('Click on the button');
});
</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/events/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aed55923fbb"><input type="hidden" name="csrf_value" value="afa0e4645dd41b4e2bcee36905eaa0f8"><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>
Autorun
</span></button><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--expand" type="button"><svg xmlns="http://www.w3.org/2000/svg" width="11" height="11" viewBox="0 0 11 11"><path d="M1.375 5.125v4.5h4.5m3.75-3.75v-4.5h-4.5" fill="none" fill-rule="evenodd" stroke="currentColor"></path></svg></button></div><div class="course-browser__content"><div class="course-browser__zoomer"><iframe class="course-browser__zoomer-element js--preview-document"></iframe><p class="course-browser__focus-message">
Click inside the mini browser to put the focus in this window.
</p></div><div class="course-browser__menu course-browser__menu--vertical"><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--increase" type="button" disabled title="Larger"><span class="course-browser__menu-item-inner">Larger</span></button><span class="course-browser__menu-item course-browser__zoom"><span class="course-browser__menu-item-inner">100%</span></span><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--decrease" type="button" title="Smaller"><span class="course-browser__menu-item-inner">Smaller</span></button></div></div><div class="console console--modal console--modal-collapsed js--console"><div class="console__heading"><span class="console__heading-title">Console<span class="console__counter hidden js--console__counter"></span></span><button class="console__heading-button js--console__toggle" type="button" title="Switch console"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-collapse"></use></svg></button></div><div class="console__content js--console__content"></div></div><div class="course-goals js--goals"><div class="course-goals__heading"><span class="course-goals__heading-title"><span class="course-goals__count-label">Goals</span><span class="course-goals__count">completed</span></span><div class="js--annotations course-task-stats course-task-stats--disabled course-task-stats--centered "><span class="course-task-stats__indicator"><svg width="12" height="12" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M15 8C15 11.866 11.866 15 8 15C4.13403 15 1 11.866 1 8C1 4.13403 4.13403 1 8 1C11.866 1 15 4.13403 15 8ZM16 8C16 12.4183 12.4183 16 8 16C3.58173 16 0 12.4183 0 8C0 3.58173 3.58173 0 8 0C12.4183 0 16 3.58173 16 8ZM6.7287 3.88849C6.6958 3.59229 6.92761 3.33325 7.22565 3.33325H8.77502C9.07306 3.33325 9.30487 3.59229 9.27197 3.88849L8.71643 8.88849C8.68829 9.14166 8.47424 9.33325 8.21948 9.33325H7.78119C7.52643 9.33325 7.31238 9.14166 7.28424 8.88849L6.7287 3.88849ZM9.33368 12.0001C9.33368 12.7365 8.73669 13.3334 8.00031 13.3334C7.26392 13.3334 6.66699 12.7365 6.66699 12.0001C6.66699 11.2637 7.26392 10.6667 8.00031 10.6667C8.73669 10.6667 9.33368 11.2637 9.33368 12.0001Z" fill="currentColor"></path></svg><span class="js--annotations-counter course-task-stats__counter">0</span></span><div class="course-task-stats__scroller-wrapper"><div class="course-task-stats__scroller"><ul class="js--annotations-list course-task-stats__list"></ul></div></div></div><button class="course-goals__button course-goals__button--expand js--goals__expand" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-collapse"></use></svg></button><a class="course-goals__button course-goals__button--next button button--green button--without-border hidden" href="/courses/javascript-browser/events/hide-popup" title="Hiding the popup"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#arrow-white--mini"></use></svg></a></div><div class="course-goals__content"><ol class="course-goals__list"><li class="course-goals__list-item">Delete the console output in the handler function, and replace it with a <code>popup</code> that has the <code class="nowrap">modal--show</code> class using <code>classList.add()</code><span class="mark">.</span></li><li class="course-goals__list-item">Click on the “Show contacts” button and make sure that the window actually appears on the page.</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
src="https://assets.htmlacademy.org/scripts/courses-spa/htmlacademy-task.v43.js"
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data-lang="en"
></script><script>HtmlacademyTask.setRoutes({task:'/courses/javascript-browser/events/events',check:'/courses/javascript-browser/events/events/check'});</script><script>HtmlacademyTask.setup(function(){this.setView(HtmlCssView,function(){this.setActiveEditor("js"),this.disableEditor("html"),this.disableEditor("css")}),this.setRunner(HtmlCssRunner),this.setChecker(HtmlCssJsChecker,function(){this.setMatcher(function(t){t.goal("replace.log.with.class").code('"#builtin.anything"; openPopupButton.addEventListener("click", function (evt) { evt.preventDefault(); popup.classList.add("modal--show"); })')}),this.addGoal("replace.log.with.class"),this.addGoal("click.button",function(){return!1});var t=this;this.addTrigger(".button-open","click",function(){t.isSolved("replace.log.with.class")&&t.setGoalCompleted("click.button")})}),this.setAnswers([{goal:1,editor:"js",data:function(){this.tooltip("Replace the console output with a class").at(5).find("console.log('Click on the button')").replace("popup.classList.add('modal--show')")}},{goal:2,editor:"js",data:function(){this.tooltip('Click on the “Show contacts” button <img class="tooltip-answer__image" src="https://assets.htmlacademy.ru/img/courses/hand.gif">',3e3).at(5).add("")}}])});</script><script>HtmlacademyTask.setupAssets({"candy-shop\/setting.css":"@font-face{font-family:\"Open Sans\";font-weight:400;font-style:normal;src:url(fonts\/OpenSans-Regular.woff) format(\"woff\"),url(fonts\/OpenSans-Regular.woff2) format(\"woff2\")}@font-face{font-family:\"Open Sans\";font-weight:700;font-style:normal;src:url(fonts\/OpenSans-Bold.woff) format(\"woff\"),url(fonts\/OpenSans-Bold.woff2) format(\"woff2\")}body{font-weight:400;font-size:16px;font-family:\"Open Sans\",\"Arial\",sans-serif;color:#3a3a3a}"});</script><footer class="page-footer page-footer--tiny"><div class="page-footer__inner"><p><a href="/docs/cookies">Cookies</a> ∙
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