We saw how the onscroll event handler works. We can use it to track when a user scrolls down a page. Muffin wants the “Up” button to appear if the user has scrolled down by more than 200px. How can you determine how many pixels have been scrolled down the page?
Use the pageYOffset property of the browser window. It contains the number of pixels by which the user has scrolled vertically down the page:
// If we are at the very top of the page
console.log(window.pageYOffset); // Outputs: 0
// Scroll down the page by 200px
console.log(window.pageYOffset); // Outputs: 200
In order to show the “Up” button in time, we need to track the vertical scrolling value. Let’s see how it changes. To do this, tell JavaScript to output it to the console every time when the onscroll event is triggered.
The horizontal scroll value is stored in the pageXOffset property.
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The onscroll event handler</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><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. Start filtering on the site</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/strict-equality-operator">8. Strict equality operator</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/onchange-event-handler">9. The onchange event handler</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/add-class">10. Add a class to news story from the selected category</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/strict-inequality-operator">11. Strict inequality operator</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/scrolling-and-operators/showing-news">12. 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. Test: Rate the site</a></li></ul></div></div><a class="main-nav__course-item main-nav__course-button main-nav__course-button--next" href="/courses/javascript-basics/scrolling-and-operators/show-button">Show the “Up” button</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-basics%2Fscrolling-and-operators%2Fpageyoffset-property" 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-basics%2Fscrolling-and-operators%2Fpageyoffset-property" title="Log in" data-modal="open" data-value="login" itemprop="url"><span 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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">The pageYOffset property</h1><div class="course-theory__content-text"><p>We saw how the <code>onscroll</code> event handler works. We can use it to track when a user scrolls down a page. Muffin wants the “Up” button to appear if the user has scrolled down by more than 200px. How can you determine how many pixels have been scrolled down the page?</p><p>Use the <code>pageYOffset</code> property of the browser window. It contains the number of pixels by which the user has scrolled vertically down the page:</p><pre><code>// If we are at the very top of the page
console.log(window.<mark>pageYOffset</mark>); // Outputs: 0
// Scroll down the page by 200px
console.log(window.<mark>pageYOffset</mark>); // Outputs: 200</code></pre><img src="/assets/courses/24/img/scheme1.svg" alt="The window.pageYOffset property" ><p>In order to show the “Up” button in time, we need to track the vertical scrolling value. Let’s see how it changes. To do this, tell JavaScript to output it to the console every time when the <code>onscroll</code> event is triggered.</p><div class="info info--frame-heading info--frame-heading--bytheway info--green"><p>The horizontal scroll value is stored in the <code>pageXOffset</code> property.</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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