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curriculum/challenges/english/blocks/learn-fetch-and-promises-by-building-an-fcc-authors-page/641daae5e18eae4b562633e4.md

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--description--

Finally, what if there's an error and the author data fail to load? Then we need to show an error in the UI. That's exactly what the .catch() method is for – handling errors.

Inside the .catch(), remove the console.error() and set the innerHTML of the authorContainer to a p element with the class "error-msg" and text "There was an error loading the authors".

--before-all--

js
window.fetch = () => Promise.resolve({json: () => Promise.resolve([{ author: 'Whoever', image: 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==', url: "http://not-a-real-url.nowhere/", bio: 'words go here' }])});

--hints--

You should remove your console.error and its text.

js
assert.notMatch(code, /console\.error\(\s*`There\s+was\s+an\s+error:\s+\$\{err\}`\s*\)\s*;?/)

You should access the innerHTML of authorContainer and set it to a p element. Don't forget to surround the p element with a template literal.

js
assert.match(code, /authorContainer\.innerHTML\s*=\s*(`|"|')\s*<p.*>.*<\/p>\s*\1/)

Your p element should have the class "error-msg".

js
assert.match(code, /(`|"|')\s*<p\s+class\s*=\s*("|')error-msg\2>/)

Your p element should have the text "There was an error loading the authors".

js
assert.match(code, /(`|"|')<p\s+class\s*=\s*("|')error-msg\2>\s*There\s+was\s+an\s+error\s+loading\s+the\s+authors\s*<\/p>\s*\1\s*;?/)

--seed--

--seed-contents--

html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>freeCodeCamp News Author Page</title>
    <link rel="stylesheet" href="./styles.css" />
  </head>
  <body>
    <h1 class="title">freeCodeCamp News Author Page</h1>

    <main>
      <div id="author-container"></div>
      <button class="btn" id="load-more-btn">Load More Authors</button>
    </main>

    <script src="./script.js"></script>
  </body>
</html>
css
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --main-bg-color: #1b1b32;
  --light-grey: #f5f6f7;
  --dark-purple: #5a01a7;
  --golden-yellow: #feac32;
}

body {
  background-color: var(--main-bg-color);
  text-align: center;
}

.title {
  color: var(--light-grey);
  margin: 20px 0;
}

#author-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.user-card {
  border-radius: 15px;
  width: 300px;
  height: 350px;
  background-color: var(--light-grey);
  margin: 20px;
}

.user-img {
  width: 150px;
  height: 150px;
  object-fit: cover;
}

.purple-divider {
  background-color: var(--dark-purple);
  width: 100%;
  height: 15px;
}

.author-name {
  margin: 10px;
}

.bio {
  margin: 20px;
}

.error-msg {
  color: var(--light-grey);
}

.btn {
  cursor: pointer;
  width: 200px;
  margin: 10px;
  color: var(--main-bg-color);
  font-size: 14px;
  background-color: var(--golden-yellow);
  background-image: linear-gradient(#fecc4c, #ffac33);
  border-color: var(--golden-yellow);
  border-width: 3px;
}
js
const authorContainer = document.getElementById('author-container');
const loadMoreBtn = document.getElementById('load-more-btn');

let startingIndex = 0;
let endingIndex = 8;
let authorDataArr = [];

fetch('https://cdn.freecodecamp.org/curriculum/news-author-page/authors.json')
  .then((res) => res.json())
  .then((data) => {
    authorDataArr = data;
    displayAuthors(authorDataArr.slice(startingIndex, endingIndex));  
  })
  .catch((err) => {
    --fcc-editable-region--
    console.error(`There was an error: ${err}`);

    --fcc-editable-region--
  });

const fetchMoreAuthors = () => {
  startingIndex += 8;
  endingIndex += 8;

  displayAuthors(authorDataArr.slice(startingIndex, endingIndex));
  if (authorDataArr.length <= endingIndex) {
    loadMoreBtn.disabled = true;
    loadMoreBtn.textContent = 'No more data to load';
  }
};

const displayAuthors = (authors) => {
  authors.forEach(({ author, image, url, bio }, index) => {
    authorContainer.innerHTML += `
    <div id="${index}" class="user-card">
      <h2 class="author-name">${author}</h2>
      
      <div class="purple-divider"></div>
      <p class="bio">${bio.length > 50 ? bio.slice(0, 50) + '...' : bio}</p>
      <a class="author-link" href="${url}" target="_blank">${author} author page</a>
    </div>
  `;
  });
};

loadMoreBtn.addEventListener('click', fetchMoreAuthors);