Scroll Reveal Paragraph

Scroll Reveal Paragraph is a React and Tailwind CSS marquee component from SmoothUI, licensed MIT. Copy it and paste it into your project.

SmoothUI MIT marquee

What it is

Scroll Reveal Paragraph is a React and Tailwind CSS marquee component from SmoothUI, licensed MIT. Copy it and paste it into your project.

How to use it

Open it in the catalogue, press copy, and paste it into your project. The prompt you copy carries the code and the rules that tell your agent to reproduce it without changing anything.

Open in the catalogue

Five free copies a month. No card.

Needs

npm i motion

Licence

This component comes from SmoothUI and is redistributed under the MIT licence, which permits commercial use. The copyright notice travels with the code.

Scroll Reveal Paragraph

index.tsx

"use client";

import {
  type MotionValue,
  motion,
  useReducedMotion,
  useScroll,
  useTransform,
} from "motion/react";
import { useRef } from "react";

const KEY_PREFIX_LENGTH = 3;

export interface ScrollRevealParagraphProps {
  className?: string;
  paragraph: string;
}

export default function ScrollRevealParagraph({
  paragraph,
  className = "",
}: ScrollRevealParagraphProps) {
  const container = useRef<HTMLParagraphElement>(null);
  const { scrollYProgress } = useScroll({
    offset: ["start 0.9", "start 0.25"],
    target: container,
  });

  const words = paragraph.split(" ");

  return (
    <p className={`text-lg leading-relaxed ${className}`} ref={container}>
      {words.map((word, i) => {
        const start = i / words.length;
        const end = start + 1 / words.length;
        return (
          <Word
            key={`word-${i}-${word.slice(0, KEY_PREFIX_LENGTH)}`}
            progress={scrollYProgress}
            range={[start, end]}
          >
            {word}
          </Word>
        );
      })}
    </p>
  );
}

interface WordProps {
  children: string;
  progress: MotionValue<number>;
  range: [number, number];
}

const Word = ({ children, progress, range }: WordProps) => {
  const shouldReduceMotion = useReducedMotion();
  const opacity = useTransform(
    progress,
    range,
    shouldReduceMotion ? [1, 1] : [0, 1]
  );

  return (
    <span className="relative mr-2 inline-block">
      {shouldReduceMotion ? null : (
        <span className="text-foreground/10">{children}</span>
      )}
      <motion.span
        className="absolute inset-0 text-foreground"
        style={{ opacity }}
      >
        {children}
      </motion.span>
    </span>
  );
};

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