HackerNEWS/index.html at master · letsdoyi/HackerNEWS · GitHub

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<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>HACKER NEWS</title>
  <style>
    * {
      font-family: sans-serif;
    }

    #menu {
      background-color: black;
      height: 30px;
      line-height: 30px;
      color: white;
      font-size: 20px;
      font-weight: 900;
      padding-left: 16px;
    }

    #news-ol {
      background-color: #F6F6EF;
      margin: 0;
    }

    .news-list {
      padding: 10px;
      font-size: 20px;
      height: 30px;
      border-bottom: 1px solid black;
    }

    a {
      text-decoration: none;
      color: #333;
    }

    a:visited {
      color: #aaa;
    }

    #btn-wrapper {
      background-color: #F6F6EF;
      height: 50px;
      padding-left: 40px;
    }

    #more-btn {
      background-color: #F6F6EF;
      border: none;
      font-size: 20px;
      padding: 10px;
      height: 30px;
    }

    #footer {
      height: 100px;
      background-color: #F6F6EF;
      border-top: 3px solid black;
      text-align: center;
      padding: 30px;
    }

    span {
      display: block;
    }
  </style>
</head>

<body>
  <div id="menu">Hacker News</div>
  <ol id="news-ol">
    <!-- <li class="news-list"><a href="">The Moon is older than previously believed</a></li>
    <li class="news-list"><a href="">A $5,600 Electric Makeover for Old Diesel Cars</a></li>
    <li class="news-list"><a href="">National Australia Bank compromises thousands of customer details</a></li>
    <li class="news-list"><a href="">The Moon is older than previously believed</a></li>
    <li class="news-list"><a href="">A $5,600 Electric Makeover for Old Diesel Cars</a></li>
    <li class="news-list"><a href="">National Australia Bank compromises thousands of customer details</a></li>
    <li class="news-list"><a href="">The Moon is older than previously believed</a></li>
    <li class="news-list"><a href="">A $5,600 Electric Makeover for Old Diesel Cars</a></li>
    <li class="news-list"><a href="">National Australia Bank compromises thousands of customer details</a></li>
    <li class="news-list"><a href="">The Moon is older than previously believed</a></li>
    <li class="news-list"><a href="">A $5,600 Electric Makeover for Old Diesel Cars</a></li>
    <li class="news-list"><a href="">National Australia Bank compromises thousands of customer details</a></li>
    <li class="news-list">Electron 6.0.0 - 마지막 10번째 뉴스</li> -->
  </ol>
  <div id="btn-wrapper">
    <button id="more-btn">More 10 NEWS</button>
  </div>
  <div id="footer">
    <span id="date"></span>
    <span>2019/8/3</span>
  </div>

  <script src="http://code.jquery.com/jquery-3.1.0.js"></script>
  <script>
    const NEWS_ID_LIST_URL = "https://hacker-news.firebaseio.com/v0/topstories.json"
    const NEWS_URL = "https://hacker-news.firebaseio.com/v0/item/"
    const $ol = document.querySelector('#news-ol');
    const $moreBtn = document.querySelector('#more-btn');
    const IdObjArr = [];
    const $date = document.querySelector('#date');
    const newsNumController = {
      start: 0,
      numberOfNEWS: 10,
      getNextStart: function () {
        newsNumController.start += newsNumController.numberOfNEWS;
        newsNumController.end += newsNumController.numberOfNEWS;
      }
    };

    $date.textContent = `${Date()}`;

    function getNews(start, end) {
      function getNewsIDList() {
        return new Promise(function (resolve, reject) {
          $.get({
            url: NEWS_ID_LIST_URL,
            success: function (data) {
              resolve(data);
            }
          })
        })
      };

      function getNewsDetail(id) {
        return new Promise(function (resolve, reject) {
          $.get({
            url: NEWS_URL + id + '.json',
            success: function (data) {
              resolve(data);
            }
          });
        });
      };

      function visualize(obj) {
        let $newLi = document.createElement('li');
        let $newA = document.createElement('a');
        $newLi.className = 'news-list';
        $newA.textContent = obj.title;
        $newA.href = obj.url;
        $ol.appendChild($newLi);
        $newLi.appendChild($newA);
      };

      getNewsIDList().then(ids => {
        slicedIds = ids.slice(start, end);
        return slicedIds;
      }).then(slicedIds => {
        for (var i = 0; i < slicedIds.length; i++) {
          IdObjArr[i] = getNewsDetail(slicedIds[i]).then((data) => {
            return { title: data.title, url: data.url };
          });
        }
        Promise.all(IdObjArr).then(value => { // 'Promise.all'이 각 promise의 executor를 순차실행하는 건 아니에요. 각 프라미스가 순차적으로 리졸브 되는것도 아니구요
          value.forEach(el => visualize(el));
        });
      });
    }

    function clearNews() {
      $ol.innerHTML = '';
    }

    function getNewOrderNumber() {
      $ol.start = newsNumController.start + 1;
    }

    newsNumController.end = newsNumController.start + newsNumController.numberOfNEWS;
    getNews(0, 10);

    $moreBtn.addEventListener('click', () => {
      clearNews();
      newsNumController.getNextStart();
      getNewOrderNumber();
      getNews(newsNumController.start, newsNumController.end);
    });

  </script>
</body>

</html>