使用JavaScript实现动态搜索过滤与文本高亮显示

<main>
  <input
    type="search"
    name="search_box"
    id="search-box"
    class="search_box"
    placeholder="搜索大学..."
  />
  <h1 class="title">全球顶尖大学列表</h1>
  <ul class="world-universities_list" id="world-universities_list">
    <li class="university">Massachusetts Institute of Technology (MIT)</li>
    <li class="university">Stanford University</li>
    <li class="university">Harvard University</li>
    <li class="university">California Institute of Technology (Caltech)</li>
    <li class="university">University of Oxford</li>
    <li class="university">University of Cambridge</li>
    <li class="university">University of Chicago</li>
    <li class="university">ETH Zurich - Swiss Federal Institute of Technology</li>
    <li class="university">University of California, Berkeley (UCB)</li>
    <li class="university">Aalborg University (Denmark)</li>
    <li class="university">Aalto University (Finland)</li>
    <li class="university">Aarhus University (Denmark)</li>
    <li class="university">Abdullah Gül University (Turkey)</li>
    <li class="university">Abertay University (United Kingdom)</li>
    <li class="university">Aberystwyth University (United Kingdom)</li>
    <li class="university">Abia State University (Nigeria)</li>
    <li class="university">Abilene Christian University (United States)</li>
    <li class="university">Adam Mickiewicz University (Poland)</li>
    <li class="university">Addis Ababa University (Ethiopia)</li>
    <li class="university">Adelphi University (United States)</li>
    <li class="university last-u">Princeton University</li>
  </ul>
</main>

body {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
}

*, *::before, ::after {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

main {
    background-color: rgb(255, 255, 255);
    margin: 1.5rem;
    display: flex;
    flex-direction: column;
}

.title {
    text-align: center;
    color: rgb(221, 4, 58);
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    font-size: 2rem;
    margin-top: 2rem;
}

.search_box {
    display: block;
    width: 100%;
    height: 2rem;
    border-radius: 0.5rem;
    border: 1.5px solid #0000002c;
    margin-top: 2rem;
    outline: none;
    padding: 2px;
}

.world-universities_list {
    background-color: rgb(104, 7, 39);
    color: white;
    padding: 1.5rem;
    border-radius: 1rem;
    margin-top: 3rem;
}

.university:not(.last-u) {
    margin-bottom: 2rem;
}

.highlight {
    background-color: aqua; /* 高亮背景色 */
    font-weight: bold;      /* 字体加粗 */
    color: #333;            /* 调整高亮文本颜色，使其更清晰 */
}

const searchBox = document.getElementById("search-box");
const universities = document.querySelectorAll(".university");

const searchUniversity = () => {
  searchBox.addEventListener("keyup", () => {
    // 1. 获取并处理搜索框输入
    const searchBoxInput = searchBox.value.toLowerCase(); // 转换为小写
    const noWhiteSpaceInput = searchBoxInput.replace(/\s/g, ""); // 移除所有空格

    universities.forEach((university) => {
      const universityName = university.textContent.toLowerCase().replace(/\s/g, ""); // 获取大学名称并处理

      // 2. 过滤列表项的可见性
      if (universityName.includes(noWhiteSpaceInput)) {
        university.style.display = "block"; // 显示匹配项
      } else {
        university.style.display = "none"; // 隐藏不匹配项
      }

      // 3. 高亮匹配文本
      // 创建一个正则表达式，用于查找所有匹配的关键词，不区分大小写
      const regex = new RegExp(`(${noWhiteSpaceInput})`, "gi");
      // 使用 replace 方法将匹配的关键词替换为带有 highlight 类的 span 标签
      // $1 是对正则表达式中第一个捕获组（即 `(${noWhiteSpaceInput})`）的引用
      const highlightedText = university.textContent.replace(regex, "<span class='highlight'>$1</span>");
      university.innerHTML = highlightedText; // 更新列表项的HTML内容
    });
  });
};

searchUniversity();