Bootstrap 5 - 以 X 开头的动画汉堡包

Question

在使用 Bootstrap4 之前，我曾使用这种方法为汉堡包按钮制作动画。但是，使用 bootstrap5，我看到图标的这种奇怪行为从 'X' 开始，点击后，变成汉堡包按钮。是什么原因造成的，我该如何解决？有很多关于如何实现这一点的博客文章，其中大部分针对 bs4，效果很好。我不太确定 bs4 和 bs5 之间发生了什么变化可能会影响这种行为。

JSFiddle to see the code in action.

<!DOCTYPE html>
<html lang="en">

<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet"
    integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

</head>
<body>

  <header>
    <nav class="navbar navbar-expand-lg navbar-light bg-light" id="NavBar">
      <div class="container-fluid">
        <a class="navbar-brand" href="#">Navbar</a>
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
          aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
          <span class="icon-bar top-bar"></span>
          <span class="icon-bar middle-bar"></span>
          <span class="icon-bar bottom-bar"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarSupportedContent">
          <ul class="navbar-nav me-auto mb-2 mb-lg-0">
            <li class="nav-item">
              <a class="nav-link active" aria-current="page" href="#">Home</a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item dropdown">
              <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown"
                aria-expanded="false">
                Dropdown
              </a>
              <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
                <li><a class="dropdown-item" href="#">Action</a></li>
                <li><a class="dropdown-item" href="#">Another action</a></li>
                <li>
                  <hr class="dropdown-divider">
                </li>
                <li><a class="dropdown-item" href="#">Something else here</a></li>
              </ul>
            </li>
            <li class="nav-item">
              <a class="nav-link disabled">Disabled</a>
            </li>
          </ul>
          <form class="d-flex">
            <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
            <button class="btn btn-outline-success" type="submit">Search</button>
          </form>
        </div>
      </div>
    </nav>

  </header>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
</body>

.navbar-toggler span {
  display: block;
  background-color: #4f4f4f;
  height: 3px;
  width: 25px;
  margin-top: 5px;
  margin-bottom: 5px;
  position: relative;
  left: 0;
  opacity: 1;
  transition: all 0.35s ease-out;
  transform-origin: center left;
}

.navbar-toggler span:nth-child(1) {
  margin-top: 0.3em;
}

.navbar-toggler:not(.collapsed) span:nth-child(1) {
  transform: translate(15%, -33%) rotate(45deg);
}

.navbar-toggler:not(.collapsed) span:nth-child(2) {
  opacity: 0;
}

.navbar-toggler:not(.collapsed) span:nth-child(3) {
  transform: translate(15%, 33%) rotate(-45deg);
}

.navbar-toggler span:nth-child(1) {
  transform: translate(0%, 0%) rotate(0deg);
}

.navbar-toggler span:nth-child(2) {
  opacity: 1;
}

.navbar-toggler span:nth-child(3) {
  transform: translate(0%, 0%) rotate(0deg);
}

Answer 1

请在切换按钮上添加已折叠的 class。这是因为 Hamburger Menu 图标被认为已经折叠，当您单击它时，它将被激活或运行。所以最初让它崩溃了。如果您还需要什么，请在评论中告诉我。

改变这个

         <button class="navbar-toggler">

至

         <button class="navbar-toggler collapsed">

它会完成的。

在此处查看实际操作。

.navbar-toggler span {
  display: block;
  background-color: #4f4f4f;
  height: 3px;
  width: 25px;
  margin-top: 5px;
  margin-bottom: 5px;
  position: relative;
  left: 0;
  opacity: 1;
  transition: all 0.35s ease-out;
  transform-origin: center left;
}



.navbar-toggler span:nth-child(1) {
  transform: translate(0%, 0%) rotate(0deg);
}

.navbar-toggler span:nth-child(2) {
  opacity: 1;
}

.navbar-toggler span:nth-child(3) {
  transform: translate(0%, 0%) rotate(0deg);
}

.navbar-toggler span:nth-child(1) {
  margin-top: 0.3em;
}

.navbar-toggler:not(.collapsed) span:nth-child(1) {
  transform: translate(15%, -33%) rotate(45deg);
}

.navbar-toggler:not(.collapsed) span:nth-child(2) {
  opacity: 0;
}

.navbar-toggler:not(.collapsed) span:nth-child(3) {
  transform: translate(15%, 33%) rotate(-45deg);
}

<!DOCTYPE html>
<html lang="en">

<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet"
    integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

</head>
<body>

  <header>
    <nav class="navbar navbar-expand-lg navbar-light bg-light" id="NavBar">
      <div class="container-fluid">
        <a class="navbar-brand" href="#">Navbar</a>
        <button class="navbar-toggler collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
          aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
          <span class="icon-bar top-bar"></span>
          <span class="icon-bar middle-bar"></span>
          <span class="icon-bar bottom-bar"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarSupportedContent">
          <ul class="navbar-nav me-auto mb-2 mb-lg-0">
            <li class="nav-item">
              <a class="nav-link active" aria-current="page" href="#">Home</a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item dropdown">
              <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown"
                aria-expanded="false">
                Dropdown
              </a>
              <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
                <li><a class="dropdown-item" href="#">Action</a></li>
                <li><a class="dropdown-item" href="#">Another action</a></li>
                <li>
                  <hr class="dropdown-divider">
                </li>
                <li><a class="dropdown-item" href="#">Something else here</a></li>
              </ul>
            </li>
            <li class="nav-item">
              <a class="nav-link disabled">Disabled</a>
            </li>
          </ul>
          <form class="d-flex">
            <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
            <button class="btn btn-outline-success" type="submit">Search</button>
          </form>
        </div>
      </div>
    </nav>

  </header>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>
</body>

Bootstrap 5 - 以 X 开头的动画汉堡包

Bootstrap 5 - Animated hamburger starting off as X

css

bootstrap-4

css-animations

bootstrap-5