Meow! You did a good job, but this is no time to take a break!
We need to program a gallery with my photos for the website of our web design studio. Our customers need to know our heroic web developer in person!
The gallery consists of several thumbnails (elements with the gallery__photo-preview class) and a large photo (full-photo class) When you click on a thumbnail, it should change to a large image. The large image should correspond to the preview that the user clicked on.
The image data is collected in the photos array. Each element in the array is a path to the full-size photo. The order of the elements in this array is the same as the order of the thumbnails in the markup.
The web designer has already prepared everything: there are preview images inside buttons with the gallery__photo-preview class, and when users click on these buttons, they will change the contents of the large image (full-photo class). As is typical of these assignments, we have been asked to program the user interface interaction.
First, find all of the thumbnails using querySelectorAll as well as the large image using querySelector, and then write the elements that have been found to variables.
We have already learned about querySelectorAll in this assignment as well as in this one from the “Getting to Know JavaScript in Your Browser” chapter. Take a look there if you have forgotten how this method works.
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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"><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 main-nav__course-contents-item--current"><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/click-em-all">Click ’em all!</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%2Fphoto-gallery" 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%2Fphoto-gallery" 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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2.334.725-.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">Welcome to our photo gallery</h1><div class="course-theory__content-text"><blockquote><p>Meow! You did a good job, but this is no time to take a break!</p><p>We need to program a gallery with my photos for the website of our web design studio. Our customers need to know our heroic web developer in person!</p><p>The gallery consists of several thumbnails (elements with the <code class="nowrap">gallery__photo-preview</code> class) and a large photo (<code class="nowrap">full-photo</code> class) When you click on a thumbnail, it should change to a large image. The large image should correspond to the preview that the user clicked on.</p><p>The image data is collected in the <code>photos</code> array. Each element in the array is a path to the full-size photo. The order of the elements in this array is the same as the order of the thumbnails in the markup.</p></blockquote><p>The web designer has already prepared everything: there are preview images inside buttons with the <code class="nowrap">gallery__photo-preview</code> class, and when users click on these buttons, they will change the contents of the large image (<code class="nowrap">full-photo</code> class). As is typical of these assignments, we have been asked to program the user interface interaction.</p><p>First, find all of the thumbnails using <code>querySelectorAll</code> as well as the large image using <code>querySelector</code>, and then write the elements that have been found to variables.</p><p>We have already learned about <code>querySelectorAll</code> in <a href="/courses/javascript-browser/browser-intro/query-selector-all">this assignment</a> as well as <a href="/courses/javascript-browser/browser-intro/dom-collection">in this one</a> from the “Getting to Know JavaScript in Your Browser” chapter. Take a look there if you have forgotten how this method works.</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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this.page.url = "https://htmlacademy.org/courses/javascript-browser/events/photo-gallery";
this.page.identifier = "task-567";
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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>Muffin Gallery</title>
<link href="gallery/setting.css" rel="stylesheet">
<link href="style.css" rel="stylesheet">
</head>
<body class="pattern">
<section class="gallery">
<h1>Muffin Gallery</h1>
<p class="gallery__photo-full">
<img class="full-photo" src="gallery/laptop-large.jpg" width="550" height="367" alt="Large photo">
</p>
<p class="gallery__photo-previews">
<button class="gallery__photo-preview" type="button">
<img src="gallery/laptop.jpg" alt="Preview with laptop">
</button>
<button class="gallery__photo-preview" type="button">
<img src="gallery/microphone.jpg" alt="Preview with microphone">
</button>
<button class="gallery__photo-preview" type="button">
<img src="gallery/keyboard.jpg" alt="Preview with keyboard">
</button>
<button class="gallery__photo-preview" type="button">
<img src="gallery/signboard.jpg" alt="Preview with tablet">
</button>
<button class="gallery__photo-preview" type="button">
<img src="gallery/tree.jpg" alt="Preview with tree">
</button>
</p>
</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">.gallery {
display: flex;
flex-direction: column;
align-items: center;
}
.gallery__photo-full {
margin-bottom: 12px;
}
.gallery__photo-full img {
display: block;
}
.gallery__photo-previews {
display: flex;
list-style-type: none;
margin: 0;
width: 550px;
padding: 0;
justify-content: space-between;
}
.gallery__photo-preview {
padding: 0;
border: 0;
border-radius: 0;
background: none;
}
.gallery__photo-preview:hover,
.gallery__photo-preview:focus {
opacity: 0.7;
}
.gallery__photo-preview img {
display: block;
object-fit: cover;
width: 100px;
height: 100px;
}
.gallery__photo-preview--active img {
outline: 5px solid red;
outline-offset: -5px;
}
.pattern {
background: url("gallery/leaves-pattern.png") 0 0 repeat;
}
</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 photos = [
'gallery/laptop-large.jpg',
'gallery/microphone-large.jpg',
'gallery/keyboard-large.jpg',
'gallery/signboard-large.jpg',
'gallery/tree-large.jpg'
];
</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/photo-gallery/signal" class="course-unhappy__form form"><input type="hidden" name="csrf_name" value="csrf69aea4ee4e58f"><input type="hidden" name="csrf_value" value="f9dcce9050c3494105a0b1e3b6166d71"><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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