CSS implementation back to top and smooth transition
Apr 04, 2025 am 07:24 AM
Implementing a back to top button with a smooth transition effect in CSS requires the following steps: Add an element with id="back-to-top"; set the button to fixed positioning, add styles (including initial transparency of 0); set the transparency to 1 when the button is hovered, and add a smooth transition effect; add scroll detection for the button using JavaScript, display the button when scrolling more than 100 pixels, and scroll smoothly to the top when clicking the button.
How to implement back to top and smooth transitions in CSS
The Back to Top button is a useful feature that allows users to quickly return to the top of the web page. To implement a back to top button with a smooth transition effect using CSS, follow these steps:
Step 1: HTML
<code class="html"><a href="#" id="back-to-top">回到頂部</a></code>
Add a <a></a> element with id="back-to-top" to the element of the web page.
Step 2: CSS
<code class="css">#back-to-top { position: fixed; bottom: 20px; right: 20px; padding: 12px 20px; border: 1px solid #ccc; border-radius: 5px; background-color: #f1f1f1; color: #333; text-decoration: none; font-size: 16px; cursor: pointer; opacity: 0; transition: opacity 0.5s ease-in-out; } #back-to-top:hover { opacity: 1; }</code>
- Set the button to fixed position so that it always appears in the lower right corner of the screen.
- Sets the inner margins, borders and rounded corners of the button.
- Set the initial transparency of the button to 0 to hide it.
- Set the transparency to 1 when the button is hovering, making it visible.
- Use the
transitionproperty to add a smooth transition effect to transparency.
Step 3: Function
The following uses JavaScript to add scroll detection function to the button:
<code class="javascript">const backToTop = document.getElementById('back-to-top'); // 窗口滾動(dòng)時(shí)顯示或隱藏按鈕window.addEventListener('scroll', () => { if (window.scrollY > 100) { backToTop.style.opacity = 1; } else { backToTop.style.opacity = 0; } }); // 點(diǎn)擊按鈕時(shí)滾動(dòng)到頂部backToTop.addEventListener('click', () => { window.scrollTo({ top: 0, behavior: 'smooth' }); });</code>
- Check that the window has scrolled down by more than 100 pixels.
- If so, the button is displayed. Otherwise, hide the button.
- When the button is clicked, scroll smoothly to the top of the page.
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