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- Theory
- Theory
- Comments
Add a class to news story from the selected category
We learned how to obtain the filter value when the user switches the category. In order for the filtering to work, we need to compare the selected value with the category of each news story on the page.
We have already written a loop that goes through all the news stories and compares the category of each of them with a string. Move this loop inside the onchange event handler and change the arbitrary string to the filter value.
// Before
for (let article of articles) {
if (article.dataset.category === 'cats') {
…
}
}
// After
filter.onchange = function () {
for (let article of articles) {
if (article.dataset.category === filter.value) {
…
}
}
};Let’s check that everything works: change the filter value and make sure that the news stories from the selected category are highlighted.
Files
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="setting.css">
<link rel="stylesheet" href="style.css">
<title>FlashNews!</title>
</head>
<body class="page light-theme">
<header class="page-header">
<div class="container">
<a class="header-logo">
<img src="img/main-logo.svg" width="67" height="29" alt="FlashNews! portal logo">
</a>
<a href="subscription.html" class="subscription-link">Subscription</a>
<button class="theme-button" type="button">Change the theme</button>
</div>
</header>
<main class="index-main">
<div class="container">
<h1 class="visually-hidden">FlashNews news portal!</h1>
<div class="news-view">
<button class="row-view view-checked" type="button">Results list</button>
<button class="tile-view" type="button">Tile</button>
<select class="filter" name="news-filter">
<option value="IT">IT</option>
<option value="cats">Kitties</option>
<option value="games">Games</option>
<option value="HR">HR</option>
<option value="all" selected>All News</option>
</select>
</div>
<section class="news-list">
<h2 class="visually-hidden">All News</h2>
<article class="news-block" data-category="cats">
<img src="img/news-cat.jpg" alt="Cat eyes">
<div class="news-block-text">
<h3>Unique video!</h3>
<p>Discover the World Through the Eyes of Cats! Your life will never be the same…</p>
<span class="news-tag">#Kitties</span>
<time datetime="2020-03-24">March 24, 2020</time>
</div>
</article>
<article class="news-block" data-category="HR">
<img src="img/walk.jpg" alt="People go for walks">
<div class="news-block-text">
<h3>It can be healthy to go for a walk</h3>
<p>But it might not be if you take a stroll with the wrong people…</p>
<span class="news-tag">#HR</span>
<time datetime="2020-03-19">February 19, 2020</time>
</div>
</article>
<article class="news-block" data-category="games">
<img src="img/ar.jpg" alt="Person wearing virtual reality glasses">
<div class="news-block-text">
<h3>Augment your reality</h3>
<p>The editors of Flashnews! have prepared a gift for their subscribers…</p>
<span class="news-tag">#Games</span>
<time datetime="2020-02-18">February 18, 2020</time>
</div>
</article>
<article class="news-block" data-category="IT">
<img src="img/drone.jpg" alt="A small drone">
<div class="news-block-text">
<h3>Dronovirus</h3>
<p>The designers at the DogDrones.inc laboratory have assured that their drones cannot be carriers of dangerous
viruses…</p>
<span class="news-tag">#IT</span>
<time datetime="2019-12-22">December 22, 2019</time>
</div>
</article>
<article class="news-block" data-category="HR">
<img src="img/new-research.jpg" alt="A man looks at a board with cards">
<div class="news-block-text">
<h3>From the world of psychology</h3>
<p>Studies show that if you do more, you can actually get more done.</p>
<span class="news-tag">#HR</span>
<time datetime="2019-10-12">October 12, 2019</time>
</div>
</article>
<article class="news-block" data-category="games">
<img src="img/new-drone.jpg" alt="Quadcopter">
<div class="news-block-text">
<h3>A quadcopter is not just a fancy toy</h3>
<p>Controlling the quadcopter allows you to develop agility, spatial thinking, and the ability to climb trees…
</p>
<span class="news-tag">#Games</span>
<time datetime="2019-11-21">November 21, 2019</time>
</div>
</article>
<article class="news-block" data-category="IT">
<img src="img/new-loop.jpg" alt="Infinite loops">
<div class="news-block-text">
<h3>Infinite loops: It’s time to end them</h3>
<p>British scientists have discovered that the ability of software to function directly depends on the presence of infinite loops in it.</p>
<span class="news-tag">#IT</span>
<time datetime="2019-10-16">October 16, 2019</time>
</div>
</article>
<article class="news-block" data-category="cats">
<img src="img/news-robot2.jpg" alt="A robot vacationing at a resort">
<div class="news-block-text">
<h3>What shocking news! It’s so scandalous! Such a sensation!</h3>
<p>It turns out that you don’t have to be a cat to start programming in JavaScript!</p>
<span class="news-tag">#Kitties</span>
<time datetime="2019-12-22">December 22, 2019</time>
</div>
</article>
<article class="news-block" data-category="IT">
<img src="img/new-graph.jpg" alt="New library">
<div class="news-block-text">
<h3>New graphics library</h3>
<p>Now you can create a dashboard in just a matter of seconds.</p>
<span class="news-tag">#IT</span>
<time datetime="2019-10-14">October 14, 2019</time>
</div>
</article>
<article class="news-block" data-category="cats">
<img src="img/new-cat.jpg" alt="Cat at a laptop">
<div class="news-block-text">
<h3>This just in: SHOCKING NEWS! Secret photos from the cat nursery</h3>
<p>No one expected that THIS was going on behind the closed doors…</p>
<span class="news-tag">#Kitties</span>
<time datetime="2019-10-13">October 13, 2019</time>
</div>
</article>
</section>
</div>
</main>
<footer class="page-footer">
<div class="container">
<p>© FlashNews!</p>
<a class="footer-logo">
<img src="img/white-logo.svg" alt="FlashNews! portal logo">
</a>
</div>
</footer>
<button class="up-button" type="button">
↑
<span class="visually-hidden">Up</span>
</button>
<script src="script.js"></script>
<script src="themes.js"></script>
<script src="up-button.js"></script>
<script src="filter.js"></script>
</body>
</html>
html {
scroll-behavior: smooth;
}
.hidden {
display: none;
}
.subscription-link {
position: relative;
padding-top: 8px;
padding-right: 2px;
padding-bottom: 6px;
padding-left: 26px;
margin: auto 4%;
}
.subscription-link::before {
position: absolute;
content: "";
width: 18px;
height: 12px;
top: 9px;
left: 2px;
}
.subscription-link:hover {
padding-bottom: 4px;
border-bottom: 2px solid;
}
.subscription-link:active {
opacity: 0.6;
}
.light-theme .subscription-link {
color: #6653d9;
outline-color: #b6aaff;
}
.light-theme .subscription-link:hover {
border-color: #6653d9;
}
.light-theme .subscription-link::before {
background-image: url("img/letter-light.svg");
}
.dark-theme .subscription-link {
color: #9484f2;
outline-color: #6653d9;
}
.dark-theme .subscription-link:hover {
border-color: #9484f2;
}
.dark-theme .subscription-link::before {
background-image: url("img/letter-dark.svg");
}
.up-button {
position: fixed;
z-index: 1;
padding: 0;
bottom: 75px;
right: 20px;
width: 64px;
height: 64px;
font-size: 36px;
font-weight: bold;
text-align: center;
vertical-align: middle;
border: 5px solid;
border-radius: 50%;
display: none;
cursor: pointer;
}
.light-theme .up-button {
color: #6653d9;
background-color: rgba(255, 255, 255, 0.8);
border-color: #6653d9;
outline-color: #b6aaff;
}
.light-theme .up-button:hover {
color: #473c8d;
background-color: rgba(255, 255, 255, 0.8);
border-color: #473c8d;
}
.dark-theme .up-button {
color: #9484f2;
background-color: rgba(10, 9, 16, 0.6);
border-color: #9484f2;
outline-color: #6653d9;
}
.dark-theme .up-button:hover {
color: #6653d9;
background-color: rgba(10, 9, 16, 0.6);
border-color: #6653d9;
}
.shown {
display: inline-block;
}
/* Filter styles */
.filter {
display: flex;
padding: 7px 22px 7px 12px;
box-sizing: border-box;
margin: 0 0 0 auto;
font-size: inherit;
border: none;
border-radius: 2px;
-moz-appearance: none;
-webkit-appearance: none;
appearance: none;
background-repeat: no-repeat, repeat;
background-position: right 8px top 50%;
background-size: 8px auto;
}
.filter::-ms-expand {
display: none;
}
.filter:focus {
outline-offset: 0;
}
.light-theme .filter {
color: #ffffff;
background-color: #6653d9;
background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23ffffff%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
}
.light-theme .filter:hover {
background-color: #473c8d;
}
.light-theme .filter:focus {
outline-color: #b6aaff;
}
.dark-theme .filter {
color: #17161a;
background-color: #9484f2;
background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2317161a%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
}
.dark-theme .filter:hover {
background-color: #6653d9;
}
.dark-theme .filter:focus {
outline-color: #6653d9;
}
/* News tags styles */
.news-tag {
padding: 4px 8px;
margin: 0 auto 0 0;
border-radius: 12px;
}
.list-tiles-view .news-tag {
margin-bottom: 4px;
}
.light-theme .news-tag {
color: #aaaaaa;
background-color: #f2f2f2;
}
.dark-theme .news-tag {
color: #888888;
background-color: #0a0910;
}
/* News block highlighting */
.news-block.highlight {
padding-top: 6px;
padding-right: 6px;
padding-bottom: 10px;
padding-left: 6px;
border: 6px solid;
}
.light-theme .news-block.highlight {
border-color: #ff9900;
}
.dark-theme .news-block.highlight {
border-color: #e58a00;
}
.list-tiles-view .highlight img {
width: calc(100% + 12px);
top: -6px;
left: -6px;
height: 140px;
}
let articles = document.querySelectorAll('.news-block');
let filter = document.querySelector('.filter');
for (let article of articles) {
if (article.dataset.category === 'cats') {
article.classList.add('highlight');
}
}
filter.onchange = function () {
console.log(filter.value);
};
let rowViewButton = document.querySelector('.row-view');
let tileViewButton = document.querySelector('.tile-view');
let newsList = document.querySelector('.news-list');
rowViewButton.onclick = function () {
rowViewButton.classList.add('view-checked');
tileViewButton.classList.remove('view-checked');
newsList.classList.remove('list-tiles-view');
};
tileViewButton.onclick = function () {
rowViewButton.classList.remove('view-checked');
tileViewButton.classList.add('view-checked');
newsList.classList.add('list-tiles-view');
};
let page = document.querySelector('.page');
let themeButton = document.querySelector('.theme-button');
themeButton.onclick = function () {
page.classList.toggle('light-theme');
page.classList.toggle('dark-theme');
};
let upButton = document.querySelector('.up-button');
window.onscroll = function () {
if (window.pageYOffset > 200) {
upButton.classList.add('shown');
} else {
upButton.classList.remove('shown');
}
};
upButton.onclick = function () {
window.scrollTo(0, 0);
};
Thanks! We’ll fix everything at once!
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100%
Console
- Transfer the code from lines 4–8 inside the
onchangeevent handler and remove the console output. - Change the condition inside the loop so that the data attribute is compared with the filter value:
article.dataset.category === filter.value. - In the mini-browser change the filter value to “Games”. Please note how the news stories from this category are now highlighted in color.
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