We found all of the news stories on the page and added highlighting to them. This will help us to debug the code and configure filtering. We will filter news stories by category. The category of each news story is specified in its data attribute:
<article class="news-block" data-category="games">
…
</article>
There are four possible values for the data-category: 'games', 'IT', 'HR', and 'cats'. The filter has the same values. When the user selects the category, we must compare the attribute value assigned to the news story with the selected value of the filter.
We already know how to compare two numbers and find out which one is larger. But how do you know that two values are equal to each other? We use the strict equality operator. It is indicated by three equal signs:
'a' === 'a'; // Result: true
'a' === 'b'; // Result: false
The strict equality operator compares two values and returns true if they are equal and false if they are not equal. The values that the operator checks for are called operands.
We will use the strict equality operator to create filtering for the news site. Add a conditional statement inside the loop and compare the value of the data-category attribute for each news item with one of the possible filter values. As a result, highlighting will be added to news stories from only one category.
JavaScript also has a non-strict equality operator: ==. We will talk about it in one of the following chapters.
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The onscroll event handler</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/pageyoffset-property">2. The pageYOffset property</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/show-button">3. Show the “Up” button</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/scrollto-method">4. The scrollTo method</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/scroll-page-onclick">5. Scroll page on click</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/finish-button">6. Finish working on the “Up” button</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/start-filtering">7. 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Showing news from a selected category</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/logical-operator-and">13. The logical operator AND</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/summary">14. Summary of “Scrolling and operators”</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/rate-site">15. 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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">Strict equality operator</h1><div class="course-theory__content-text"><p>We found all of the news stories on the page and added highlighting to them. This will help us to debug the code and configure filtering. We will filter news stories by category. The category of each news story is specified in its <a href="/courses/javascript-basics/element-collections-properties/data-attribute-value">data attribute</a>:</p><pre><code><article class="news-block" <mark>data-category="games"</mark>>
…
</article></code></pre><p>There are four possible values for the <code class="nowrap">data-category</code>: <code>'games'</code>, <code>'IT'</code>, <code>'HR'</code>, and <code>'cats'</code>. The filter has the same values. When the user selects the category, we must compare the attribute value assigned to the news story with the selected value of the filter.</p><p>We already know how to compare two numbers and find out which one is larger. But how do you know that two values are equal to each other? We use the strict equality operator. It is indicated by three equal signs:</p><pre><code>'a' <mark>===</mark> 'a'; // Result: true
'a' <mark>===</mark> 'b'; // Result: false</code></pre><p>The strict equality operator compares two values and returns <code>true</code> if they are equal and <code>false</code> if they are not equal. The values that the operator checks for are called <i>operands</i>.</p><p>We will use the strict equality operator to create filtering for the news site. Add a conditional statement inside the loop and compare the value of the <code class="nowrap">data-category</code> attribute for each news item with one of the possible filter values. As a result, highlighting will be added to news stories from only one category.</p><div class="info info--frame-heading info--frame-heading--bytheway info--green"><p>JavaScript also has a <i>non-strict</i> equality operator: <code>==</code>. We will talk about it in one of the <a href="/courses/javascript-programming/conditions/equality">following chapters</a>.</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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<p>No one expected that THIS was going on behind the closed doors…</p>
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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");
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.dark-theme .filter:hover {
background-color: #6653d9;
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.dark-theme .filter:focus {
outline-color: #6653d9;
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/* 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;
}
</div><div
class="js--file"
data-visible="true"
data-active="true"
data-enabled="true"
data-title="filter.js"
data-mode="js"
data-src="filter.js"
data-selection="[4,2,4,50]"
data-scroll-to=""
data-left-url-part=""
data-right-url-part=""
data-right-url-part-active="false"
data-browser-tab="false"
data-browser-tab-name=""
data-browser-tab-active="false"
data-browser-scroll="">let articles = document.querySelectorAll('.news-block');
for (let article of articles) {
// Add a conditional statement here
article.classList.add('highlight');
}
</div><div
class="js--file"
data-visible="false"
data-active="false"
data-enabled="false"
data-title="script.js"
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data-browser-scroll="">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');
};
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data-visible="false"
data-active="false"
data-enabled="false"
data-title="themes.js"
data-mode="js"
data-src="themes.js"
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data-left-url-part=""
data-right-url-part=""
data-right-url-part-active="false"
data-browser-tab="false"
data-browser-tab-name=""
data-browser-tab-active="false"
data-browser-scroll="">let page = document.querySelector('.page');
let themeButton = document.querySelector('.theme-button');
themeButton.onclick = function () {
page.classList.toggle('light-theme');
page.classList.toggle('dark-theme');
};
</div><div
class="js--file"
data-visible="false"
data-active="false"
data-enabled="false"
data-title="up-button.js"
data-mode="js"
data-src="up-button.js"
data-selection=""
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data-left-url-part=""
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Please note how only those news stories from the IT category remain highlighted.</li><li class="course-goals__list-item">On line 4, change <code>'IT'</code> to <code>'cats'</code><span class="mark">.</span><br>
Please note how news items from the “Kitties” category are now highlighted.
</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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