CodePen Embed - rev Assessment - JavaScript building blocks

<html lang="en-us">
  <head>
    <meta charset="utf-8">

    <title>Image gallery</title>

    <link rel="stylesheet" href="style.css">
    
  </head>

  <body>
    <h1>Image gallery example</h1>

    <div class="full-img">
      <img class="displayed-img" src="https://cdn.glitch.global/3efa4dc0-c1aa-4ccc-a660-baa79fe0f8ec/pic1.jpg?v=1662647926542" alt="Closeup of a human eye">
      <div class="overlay"></div>
      <button class="dark">Darken</button>
    </div>

    <div class="thumb-bar">


    </div>
    <script src="main.js"></script>
  </body>
</html>

h1 {
  font-family: helvetica, arial, sans-serif;
  text-align: center;
}

body {
  width: 640px;
  margin: 0 auto;
}

.full-img {
  position: relative;
  display: block;
  width: 640px;
  height: 480px;
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 640px;
  height: 480px;
  background-color: rgba(0,0,0,0);
}

button {
  border: 0;
  background: rgba(150,150,150,0.6);
  text-shadow: 1px 1px 1px white;
  border: 1px solid #999;
  position: absolute;
  cursor: pointer;
  top: 2px;
  left: 2px;
}

.thumb-bar img {
  display: block;
  width: 20%;
  float: left;
  cursor: pointer;
}

const displayedImage = document.querySelector('.displayed-img');
const thumbBar = document.querySelector('.thumb-bar');

const btn = document.querySelector('button');
const overlay = document.querySelector('.overlay');

/* Declaring the array of image filenames */
/* Declaring the alternative text for each image file */
const images = [
    {
        src: 'https://cdn.glitch.global/3efa4dc0-c1aa-4ccc-a660-baa79fe0f8ec/pic1.jpg?v=1662647926542',
        alt: 'Closeup of a human eye'
    },
    {
        src: 'https://cdn.glitch.global/3efa4dc0-c1aa-4ccc-a660-baa79fe0f8ec/pic2.jpg?v=1662647931322',
        alt: 'Wavy surface'
    },
    {
        src: 'https://cdn.glitch.global/3efa4dc0-c1aa-4ccc-a660-baa79fe0f8ec/pic3.jpg?v=1662647935495',
        alt: 'Purple flowers'
    },
    {
        src: 'https://cdn.glitch.global/3efa4dc0-c1aa-4ccc-a660-baa79fe0f8ec/pic4.jpg?v=1662647939623',
        alt: 'Ancient art on a wall'
    },
    {
        src: 'https://cdn.glitch.global/3efa4dc0-c1aa-4ccc-a660-baa79fe0f8ec/pic5.jpg?v=1662647943671',
        alt: 'A butterfly on a leaf'
    }
]

/* Looping through images */
  // Using dot notation:
for (const image of images) {
    const newImage = document.createElement('img');
    newImage.src = image.src;
    newImage.alt = image.alt;
    thumbBar.appendChild(newImage);
    newImage.addEventListener('click', ()=>{
        displayedImage.src = image.src;
        displayedImage.alt = image.alt
    })
}

  /* Using setAttribute/getAttribute:
  for (const image of images) {
      const newImage = document.createElement('img');
      newImage.setAttribute('src', image.src);
      newImage.setAttribute('alt', image.alt);
      thumbBar.appendChild(newImage);
      newImage.addEventListener('click', ()=>{
          displayedImage.setAttribute('src', image.src);
          displayedImage.setAttribute('alt', image.alt)
      })
  }
  */

/* Wiring up the Darken/Lighten button */
  // Using dot notation:
  btn.addEventListener('click', ()=>{
      if(btn.className === 'dark' ){
          btn.className = 'light';
          btn.textContent = 'Lighten';
          overlay.style.backgroundColor = 'rgba(0,0,0,0.5)'
      } else {
          btn.className = 'dark';
          btn.textContent = 'Darken';
          overlay.style.backgroundColor = 'rgba(0,0,0,0)'
      }
  })

  /* Using setAttribute/getAttribute:
  btn.addEventListener('click', ()=>{
      if(btn.getAttribute('class')=== 'dark'){
          btn.setAttribute('class', 'light');
          btn.textContent = 'Lighten';
          overlay.style.backgroundColor = 'rgba(0,0,0,0.5)'
      } else {
          btn.setAttribute('class', 'dark');
          btn.textContent = 'Darken';
          overlay.style.backgroundColor = 'rgba(0,0,0,0)'
      }
  })
  */

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