KPC
Kevin Powell - Community•2w ago
Ko Teemo

Scroll Animation for Floating Component

Hey everyone 👋 I came across a scroll animation effect and would love some feedback on optimization. Behavior I want: A floating component starts at the bottom-right corner. As the user scrolls down, it moves upward, and when it reaches the middle of the viewport, it stays there while the page continues to scroll. I’ve built a working solution in React (code below), but it doesn’t feel very optimized. If you have a cleaner or more efficient approach, I’d love to hear your thoughts! I’m also new to Discord, so please forgive me if I’m doing anything wrong 😊 
import { useEffect, useRef } from "react";

const FloatingComponent = () => {
  const componentRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const bottomOffset = 20;

    const handleScroll = () => {
      if (!componentRef.current) return;

      const viewportHeight = window.innerHeight;
      const elementHeight = componentRef.current.offsetHeight;

      const scrollY = window.scrollY;

      const topOffset = viewportHeight - bottomOffset - elementHeight - scrollY;

      //center position
      const centerY = (viewportHeight - elementHeight) / 2;

      // set the component top position
      componentRef.current.style.top = `${Math.max(centerY, topOffset)}px`;
    };

    window.addEventListener("scroll", handleScroll);
    window.addEventListener("resize", handleScroll);
    handleScroll();

    return () => {
      window.removeEventListener("scroll", handleScroll);
      window.removeEventListener("resize", handleScroll);
    };
  }, []);

  return (
    <div
      ref={componentRef}
      style={{
        backgroundColor: "black",
        color: "white",
        width: "fit-content",
        padding: "2rem",
        borderRadius: "2rem",
        position: "fixed",
        right: "20px",
      }}
    >
      Floating Component
    </div>
  );
};

export default FloatingComponent;
import { useEffect, useRef } from "react";

const FloatingComponent = () => {
  const componentRef = useRef<HTMLDivElement | null>(null);

  useEffect(() => {
    const bottomOffset = 20;

    const handleScroll = () => {
      if (!componentRef.current) return;

      const viewportHeight = window.innerHeight;
      const elementHeight = componentRef.current.offsetHeight;

      const scrollY = window.scrollY;

      const topOffset = viewportHeight - bottomOffset - elementHeight - scrollY;

      //center position
      const centerY = (viewportHeight - elementHeight) / 2;

      // set the component top position
      componentRef.current.style.top = `${Math.max(centerY, topOffset)}px`;
    };

    window.addEventListener("scroll", handleScroll);
    window.addEventListener("resize", handleScroll);
    handleScroll();

    return () => {
      window.removeEventListener("scroll", handleScroll);
      window.removeEventListener("resize", handleScroll);
    };
  }, []);

  return (
    <div
      ref={componentRef}
      style={{
        backgroundColor: "black",
        color: "white",
        width: "fit-content",
        padding: "2rem",
        borderRadius: "2rem",
        position: "fixed",
        right: "20px",
      }}
    >
      Floating Component
    </div>
  );
};

export default FloatingComponent;
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