Bootstrap导航栏汉堡菜单点击无下拉显示问题求助

你的汉堡菜单点击后仅图标变化但无下拉菜单显示，核心原因是导航栏内部的两个<ul>标签错误地重复添加了collapse navbar-collapse类。

Bootstrap的折叠组件逻辑是通过控制带有collapse类的容器的显示/隐藏来实现的，你已经在最外层的<div>上设置了collapse navbar-collapse并绑定了汉堡按钮的data-bs-target，但内部的<ul>又重复添加了这个类，导致折叠功能冲突——外层容器展开后，内部的<ul>仍因为自带的collapse类处于隐藏状态，所以看不到菜单内容。

修复后的完整代码 #

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title>NRC Ranking</title>
    <!-- Bootstrap 5无需依赖jQuery，可移除下面的jQuery引入 -->
    <!-- <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha384-KyZXEAg3QhqLMpG8r+JvJAK8YtahYht1d+K/pv7C5mCVv4VFLw7GMzzRdfAvPEYB" crossorigin="anonymous"></script> -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-iYQeCzEYFbKjA/T2uDLTpkwGzCiq6soy8tYaI1GyVh/UjpbCx/TYkiZhlZB6+fzT" crossorigin="anonymous">
    <!-- bootstrap.bundle.min.js已经包含了popper，可移除单独的popper引入 -->
    <!-- <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.6/dist/umd/popper.min.js" integrity="sha384-oBqDVmMz9ATKxIep9tiCxS/Z9fNfEXiDAYTujMAeBAsjFuCZSmKbSSUnQlmh/jp3" crossorigin="anonymous"></script> -->
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-u1OknCvxWvY5kfmNBILK2hRnQC3Pr17a+RTT6rIHI7NnikvbZlHgTPOOmMi466C8" crossorigin="anonymous"></script>
    <link rel="stylesheet" href="css/styles.css">
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Bellefair&family=Mate+SC&family=Quintessential&display=swap" rel="stylesheet">
  </head>
  <body>
    <!--Navbar-->
    <nav class="navbar navbar-expand-lg bg-dark">
      <div class="centered-logo">
        <a class="nav-link" href="#">
          <img class="twlogo" src="images/twlogo.png" alt="twisted wonderland logo">
        </a>
      </div>
      <button class="custom-hamburger navbar-toggler ms-auto" type="button" data-bs-toggle="collapse" data-bs-target="#navbarTogglerDemo02" aria-controls="navbarTogglerDemo02" aria-expanded="false" aria-label="Toggle navigation">
        <span class="custom-hamburger navbar-toggler-icon"></span>
      </button>
      <div class="collapse navbar-collapse" id="navbarTogglerDemo02">
        <!-- 移除ul标签上的collapse navbar-collapse类 -->
        <ul class="navbar-nav justify-content-center left-links">
          <li class="nav-item"><a class="nav-link" href="#">World</a></li>
          <li class="nav-item"><a class="nav-link" href="#">Characters</a></li>
        </ul>
        <!-- 移除ul标签上的collapse navbar-collapse类 -->
        <ul class="navbar-nav justify-content-center right-links">
          <li class="nav-item"><a class="nav-link" href="#">Tierlist</a></li>
          <li class="nav-item"><a class="nav-link" href="#">Media</a></li>
        </ul>
      </div>
    </nav>

  </body>
</html>

额外优化建议 #

1. 移除冗余依赖：Bootstrap 5的bootstrap.bundle.min.js已经内置了Popper.js，无需单独引入；同时Bootstrap 5不再依赖jQuery，可移除jQuery的引入，避免潜在的版本冲突。
2. 检查自定义样式：确认styles.css中没有覆盖Bootstrap的折叠组件样式，比如不要给.collapse或.navbar-collapse添加display: none !important这类强制隐藏的规则，否则会干扰组件的正常切换。

内容的提问来源于stack exchange，提问作者Stella