Underline Center

Underline Center is a React and Tailwind CSS component from Fancy Components, licensed MIT. Copy it and paste it into your project.

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What it is

Underline Center is a React and Tailwind CSS component from Fancy Components, 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 Fancy Components and is redistributed under the MIT licence, which permits commercial use. The copyright notice travels with the code.

Underline Center

fancy/text/underline-center.tsx

"use client"

import { ElementType, useEffect, useRef, useMemo } from "react"
import { motion, ValueAnimationTransition } from "motion/react"
import { cn } from "@/lib/utils"

interface UnderlineProps {
  /**
   * The content to be displayed and animated
   */
  children: React.ReactNode

  /**
   * HTML Tag to render the component as
   * @default span
   */
  as?: ElementType

  /**
   * Optional class name for styling
   */
  className?: string

  /**
   * Animation transition configuration
   * @default { duration: 0.25, ease: "easeInOut" }
   */
  transition?: ValueAnimationTransition

  /**
   * Height of the underline as a ratio of font size
   * @default 0.1
   */
  underlineHeightRatio?: number

  /**
   * Padding of the underline as a ratio of font size
   * @default 0.01
   */
  underlinePaddingRatio?: number
}

const CenterUnderline = ({
  children,
  as,
  className,
  transition = { duration: 0.25, ease: "easeInOut" },
  underlineHeightRatio = 0.1,
  underlinePaddingRatio = 0.01,
  ...props
}: UnderlineProps) => {
  const textRef = useRef<HTMLSpanElement>(null)
  const MotionComponent = useMemo(() => motion.create(as ?? "span"), [as])

  useEffect(() => {
    const updateUnderlineStyles = () => {
      if (textRef.current) {
        const fontSize = parseFloat(getComputedStyle(textRef.current).fontSize)
        const underlineHeight = fontSize * underlineHeightRatio
        const underlinePadding = fontSize * underlinePaddingRatio
        textRef.current.style.setProperty(
          "--underline-height",
          `${underlineHeight}px`
        )
        textRef.current.style.setProperty(
          "--underline-padding",
          `${underlinePadding}px`
        )
      }
    }

    updateUnderlineStyles()
    window.addEventListener("resize", updateUnderlineStyles)

    return () => window.removeEventListener("resize", updateUnderlineStyles)
  }, [underlineHeightRatio, underlinePaddingRatio])

  const underlineVariants = {
    hidden: {
      width: 0,
      originX: 0.5,
    },
    visible: {
      width: "100%",
      transition: transition,
    },
  }

  return (
    <MotionComponent
      className={cn("relative inline-block cursor-pointer", className)}
      whileHover="visible"
      ref={textRef}
      {...props}
    >
      <span>{children}</span>
      <motion.div
        className="absolute left-1/2 bg-current -translate-x-1/2"
        style={{
          height: "var(--underline-height)",
          bottom: "calc(-1 * var(--underline-padding))",
        }}
        variants={underlineVariants}
        aria-hidden="true"
      />
    </MotionComponent>
  )
}

CenterUnderline.displayName = "CenterUnderline"

export default CenterUnderline

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