Question

因此，当我刚刚将示例中的代码复制并粘贴到HTML文件中的脚本标签中时，它工作得很好。当我开始向下滚动时，导航栏最终会停留在顶部。

但是我想外部使用JS代码。因此，我制作了一个外部文件，添加了eventlisteners等。为了测试这些额外的功能是否起作用，我在其中添加了一些console.logs。控制台向我显示实际上一切正常。除了事实之外，导航栏不再具有粘性。

我已经问过Google，并阅读了很多其他有关粘性导航栏的问题。只是没有帮助。

希望任何人都知道解决方案-怎么了，为什么它不起作用，我该怎么做才能解决？

var navbar = document.getElementById("navbar");
var sticky = navbar.offsetTop;

function stickyNavbar() {
  if (window.pageYOffset >= sticky) {
    navbar.classList.add("sticky");
  } else {
    navbar.classList.remove("sticky");
  }
  console.log(navbar.classList);
}

function init() {
  document.addEventListener('scroll', stickyNavbar());
  console.log("init-function is successfully connected with document.addEventListener ")
}

document.addEventListener('load', init(), false);
document.addEventListener('load', console.log("page has loaded successfully "), false);

.sticky {
  position: fixed;
  top: 0;
  width: 100%;
}

h1 {
  color: red;
}

header {
  transform: none;
}

.top-container {
  background-color: #f1f1f1;
  padding: 30px;
  text-align: center;
}

#navbar {
  padding: 10px 16px;
  background: #555;
  color: #f1f1f1;
  width: 100%;
}

.sticky+.content {
  padding-top: 102px;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<header>

  <section class="container top-container">
    <h1>Innere Kinder</h1>
  </section>

  <!-- Navigation -->
  <nav id="navbar" class="navbar navbar-expand-lg navbar-light" style="background-color: black">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav mr-auto">
        <li class="nav-item active">
          <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Link</a>
        </li>
      </ul>

      <form class="form-inline my-2 my-lg-0">
        <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
        <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
      </form>
    </div>
  </nav>

</header>

<body class="content">

  <section class="container">
    "Some example text that would have to be extended to actually show the sticky navbar feature"
  </section>
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
</body>

滚动页面时，粘性导航不会停留

0 个答案: