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How to Create a Browser-Agnostic Scroll to Top Animation with Pure JavaScript?
How to Create a Browser-Agnostic Scroll to Top Animation with Pure JavaScript?
Nov 02, 2024 pm 01:27 PM
Browser-Agnostic Scroll to Top Animation
When faced with the task of creating a simple "scroll to top" animation for a link, it's tempting to reach for a JavaScript library like jQuery or MooTools. However, it is possible to achieve this effect with pure JavaScript, ensuring cross-browser compatibility.
The provided code implements a scroll animation that gracefully slides the document back to the top over a specified duration. It is a standalone function that can be applied to any element with a scroll bar, providing a better user experience by allowing them to quickly return to the top of the page.
- Function Signature:
<code class="javascript">function scrollTo(element, to, duration) {</code>
- element: The element to be scrolled, typically the html or body element.
- to: The target scroll position in pixels.
- duration: The animation duration in milliseconds.
- Animation Logic:
- If duration is not positive, the function returns immediately.
- The difference between the target and current scroll position is calculated.
- A perTick value is computed to determine the incremental scroll amount per animation frame.
- Using setTimeout, the scroll position is gradually adjusted at 10 milliseconds intervals until the target is reached.
- Example Usage:
In the provided HTML snippet, a button with the ID "scrollme" is used as the trigger for the animation:
<code class="javascript">function runScroll() {
scrollTo(document.body, 0, 600);
}
var scrollme;
scrollme = document.querySelector("#scrollme");
scrollme.addEventListener("click",runScroll,false)</code>
- When clicked, the runScroll function invokes the scrollTo animation, scrolling the page to the top over 600 milliseconds.
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