Added scroll to top feature #365
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WalkthroughThe changes introduce a "Scroll to Top" button in the Changes
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (6)
scroll.js (3)
1-2: LGTM! Consider adding error handling.The button retrieval looks good and uses const appropriately. However, consider adding error handling in case the button element is not found.
You could add a simple check like this:
const scrollToTopBtn = document.getElementById('scrollToTopBtn'); if (!scrollToTopBtn) { console.error('Scroll to top button not found'); // Optionally, you could return early here to prevent further execution }
13-19: LGTM! Consider adding a fallback for older browsers.The click event handling and smooth scrolling implementation look great. However, the
scrollTomethod withbehavior: 'smooth'is not supported in all browsers (particularly older versions of IE and Edge).Consider adding a fallback for browsers that don't support smooth scrolling:
scrollToTopBtn.addEventListener('click', function() { if ('scrollBehavior' in document.documentElement.style) { window.scrollTo({ top: 0, behavior: 'smooth' }); } else { // Fallback for browsers that don't support smooth scrolling function smoothScroll() { const currentPosition = window.pageYOffset; if (currentPosition > 0) { window.requestAnimationFrame(smoothScroll); window.scrollTo(0, currentPosition - currentPosition / 8); } } smoothScroll(); } });This provides a smooth scrolling experience across a wider range of browsers.
1-19: Overall, good implementation with room for minor improvements.The
scroll.jsfile successfully implements the "Scroll to Top" functionality as described in the PR objectives. The code is concise, well-structured, and focused on the specific task at hand.Key strengths:
- Correct implementation of button visibility based on scroll position.
- Use of smooth scrolling for a better user experience.
- Cross-browser compatibility consideration in scroll position checking.
Suggestions for improvement:
- Add error handling for button element retrieval.
- Use
addEventListenerfor the scroll event and consider throttling for performance.- Implement a fallback for smooth scrolling in older browsers.
These enhancements will make the code more robust, performant, and widely compatible.
Consider splitting the code into smaller, reusable functions. This would improve readability and make it easier to test individual parts of the functionality. For example:
function isScrolledDown() { return document.body.scrollTop > 200 || document.documentElement.scrollTop > 200; } function toggleButtonVisibility() { scrollToTopBtn.style.display = isScrolledDown() ? "block" : "none"; } function scrollToTop() { window.scrollTo({ top: 0, behavior: 'smooth' }); } window.addEventListener('scroll', throttle(toggleButtonVisibility, 200)); scrollToTopBtn.addEventListener('click', scrollToTop);This structure would make the code more modular and easier to maintain or extend in the future.
index.html (3)
16-49: LGTM! Consider enhancing keyboard accessibility.The styles for the scroll-to-top button are well-implemented, covering appearance, positioning, and responsiveness. The transition effect on opacity provides a smooth user experience.
Consider adding a
:focusstyle to enhance keyboard accessibility:#scrollToTopBtn:focus { outline: 2px solid #007bff; outline-offset: 2px; }
454-455: LGTM! Consider adding aria-label for improved accessibility.The scroll-to-top button is well-placed and includes a helpful title attribute.
To enhance accessibility, consider adding an
aria-label:- <button id="scrollToTopBtn" title="Go to top">↑</button> + <button id="scrollToTopBtn" title="Go to top" aria-label="Scroll to top of page">↑</button>This provides more context for screen reader users.
494-494: LGTM! Consider using async or defer attribute.The placement of the scroll.js script at the end of the body is correct.
To potentially improve page load performance, consider adding the
deferattribute:- <script src="scroll.js"></script> + <script src="scroll.js" defer></script>This allows the browser to download the script while parsing the HTML, and execute it after parsing is complete.
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- index.html (3 hunks)
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🔇 Additional comments (1)
index.html (1)
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16-494: Overall implementation of the scroll-to-top feature looks great!The changes effectively implement the scroll-to-top feature as described in the PR objectives. The button is well-styled, responsive, and integrated correctly into the HTML structure. The associated JavaScript file is properly linked.
A few minor suggestions have been made to enhance accessibility and potentially improve performance:
- Adding a
:focusstyle for the button- Including an
aria-labelfor better screen reader support- Considering the use of the
deferattribute for the script tagThese small improvements will further polish an already solid implementation.
| // Show the button when scrolled down 200px | ||
| window.onscroll = function() { | ||
| if (document.body.scrollTop > 200 || document.documentElement.scrollTop > 200) { | ||
| scrollToTopBtn.style.display = "block"; | ||
| } else { | ||
| scrollToTopBtn.style.display = "none"; | ||
| } | ||
| }; |
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🛠️ Refactor suggestion
Consider using addEventListener and throttling the scroll event.
The scroll event handling looks functional, but there are two areas for improvement:
-
Instead of using
window.onscroll, consider usingaddEventListener. This allows for multiple scroll event listeners if needed. -
Scroll events can fire very frequently, potentially impacting performance. Consider throttling the scroll event handler.
Here's an example of how you could refactor this section:
function throttle(func, limit) {
let inThrottle;
return function() {
const args = arguments;
const context = this;
if (!inThrottle) {
func.apply(context, args);
inThrottle = true;
setTimeout(() => inThrottle = false, limit);
}
}
}
function handleScroll() {
if (document.body.scrollTop > 200 || document.documentElement.scrollTop > 200) {
scrollToTopBtn.style.display = "block";
} else {
scrollToTopBtn.style.display = "none";
}
}
window.addEventListener('scroll', throttle(handleScroll, 200));This implementation throttles the scroll event to run at most once every 200ms, which should improve performance while maintaining responsiveness.
Issues Identification
Closes: #296
Description
Implemented a "Scroll to Top" button that allows users to quickly navigate back to the top of the page, enhancing user experience for long pages.
Details
Include any detailed information about the changes in this pull request.
Design Considerations:
Tasks performed:
1 Design the "Scroll to Top" button (icon, size, color).
2 Implement the button in HTML/CSS.
3 Add JavaScript for the smooth scroll functionality.
4 Set the button to appear only when the user scrolls down (e.g., 200px from the top).
5 Test the feature across different devices and browsers.
6 Ensure the feature does not interfere with other elements on the page.
Types of Changes
Please check the boxes that apply
Checklist
Please check the boxes that apply
Screenshots
Waste.Management.-.Google.Chrome.2024-10-20.14-40-15.mp4
If applicable, please attach screenshots of the changes made to the user interface.
Additional Information
Please provide any other information that is relevant to this pull request.
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