https://www.johannessnilsson.cc/blog/lazy-youtube

LazyYoutube.tsx

//-------------------------------------
//  https://www.johannessnilsson.cc/blog/lazy-youtube
//-------------------------------------

// Apache License, Version 2.0

// Copyright (c) 2024 Johanness Nilsson

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//     http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// LazyYoutube.tsx

'use client'

import React, 
  { 
    useState, 
    useEffect, 
    useRef 
  } 
from "react";

interface LazyYoutubeProps {
  videoId: string
  aspectRatio?: number
}

const LazyYoutube: React.FC<LazyYoutubeProps> = ({ videoId, aspectRatio = 16 / 9 }) => {
  const [load, setLoad] = useState(false)
  const videoRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
    const observer = new IntersectionObserver((entries) => {
      if (entries[0].isIntersecting) {
        setLoad(true)
        observer.disconnect()
      }
    })

    if (videoRef.current) {
      observer.observe(videoRef.current)
    }

    return () => {
      if (videoRef.current) {
        observer.unobserve(videoRef.current)
      }
    }
  }, [])

  return (
    <div ref={videoRef} style={{ position: "relative", paddingTop: `${(1 / aspectRatio) * 100}%` }}>
      {load ? (
        <iframe
          style={{ position: "absolute", top: 0, left: 0, width: "100%", height: "100%" }}
          src={`https://www.youtube.com/embed/${videoId}`}
          title="YouTube video player"
          frameBorder="0"
          allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
          allowFullScreen
        ></iframe>
      ) : null}
    </div>
  )
}

export default LazyYoutube