主页 / coding / 问题 / 79490962
Accepted
Sarah Z
Asked: 2025-03-07 08:03:32 +0800 CST

我该如何以下拉方式平滑地为下拉列表中的元素制作动画（仅在 CSS 中）？

  • 772

（我对 HTML 和 CSS 还不太熟悉，所以请耐心听我说）我一直在尝试自定义这个网站，让它看起来更美观。我想做的一件事是自定义“浏览”和“提交”下的下拉菜单，这样当你将鼠标悬停在它们上面时，它们会平滑地向下延伸，就像一个向下滑动的效果。我想同时为下拉菜单本身和里面的文本制作动画。

我正在查看的 HTML 片段是这样的：

.dropdown-toggle {
  min-height: fit-content;
  min-width: fit-content;
  max-height: fit-content;
  max-width: fit-content;
}

.dropdown-menu {
  block-size: fit-content;
  width: 100px;
  height: 200px;
  transition: height 1s;
  overflow: hidden;
}

.dropdown-menu:hover {
  height: 300px;
  block-size: fit-content;
  overflow: hidden;
}

.nav-item dropdown {
  width: 100px;
  height: 100px;
  transition: height 2s;
  block-size: fit-content;
  overflow: hidden;
}

.nav-item dropdown:hover {
  height: 300px;
  block-size: fit-content;
  overflow: hidden;
}

.nav-link dropdown-toggle {
  width: 100px;
  height: 100px;
  transition: height 1s;
  overflow: hidden;
}

.nav-link dropdown-toggle:hover {
  height: 300px;
}


.dropdown-item {
  width: 30px;
  height: 30px;
  transition: height 1s;
  position: sticky;
}

.dropdown-item:hover {
  height: 50px;
}

.dropdown-menu show {
  min-height: 0px;
  min-width: 0px;
  max-height: 300px;
  max-width: 300px;
}

.dropdown-menu show:hover {
  height: 50px;
}
<!-- Left Nav Section -->
<ul class="navbar-nav mr-auto navbar-left">
  <li class="nav-item">
    <a class="nav-link" href="https://toyhou.se/DeclineOfMySanity">
      <span class="fa fa-home"></span> Profile 
    </a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="https://toyhou.se/~forums">
     <span class="fa fa-comments"></span> Forums 
    </a>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" data-toggle="dropdown" data-target="#dropdownBrowse" >
      <span class="fa fa-fw fa-search"></span> 
      Browse 
    </a>
    <div class="dropdown-menu" id="dropdownBrowse">
      <h6 class="dropdown-header">Characters</h6>
      <a class="dropdown-item" href="https://toyhou.se/~browse/popular"><i class="fa fa-fire fa-fw mr-1"></i> Popular </a>
      <a class="dropdown-item" href="https://toyhou.se/~browse/feed"><i class="fa fa-binoculars fa-fw mr-1"></i> Feed </a>
      <a class="dropdown-item" href="https://toyhou.se/~browse/recent"><i class="fa fa-fw fa-clock mr-1"></i> Recent </a>
      <a class="dropdown-item" href="https://toyhou.se/~browse/search"><i class="fa fa-fw fa-search mr-1"></i> Search </a>
      <h6 class="dropdown-header">Browse</h6>
      <a class="dropdown-item" href="https://toyhou.se/~library/popular"><i class="fa fa-fw fa-book mr-1"></i> Literatures </a>
      <a class="dropdown-item" href="https://toyhou.se/~worlds"><i class="fa fa-fw fa-globe mr-1"></i> Worlds </a>
    </div>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" data-toggle="dropdown" data-target="#dropdownCreate" > <span class="fa fa-fw fa-plus"></span> Submit </a>
    <div class="dropdown-menu" id="dropdownCreate">
      <a class="dropdown-item" href="https://toyhou.se/~characters/create"><i class="fa fa-fw fa-user mr-1"></i> Character </a>
      <a class="dropdown-item" href="https://toyhou.se/~bulletins/create"><i class="fa fa-fw fa-newspaper mr-1"></i> Bulletin </a>
      <a class="dropdown-item" href="https://toyhou.se/~images/upload"><i class="fa fa-fw fa-image mr-1"></i> Image </a>
      <a class="dropdown-item" href="https://toyhou.se/~images/multi-upload"><i class="fa fa-fw fa-image mr-1"></i> Multi-Images </a>
      <a class="dropdown-item" href="https://toyhou.se/~literatures/create"><i class="fa fa-fw fa-book mr-1"></i> Literature </a>
      <a class="dropdown-item" href="https://toyhou.se/~worlds/create"><i class="fa fa-fw fa-globe mr-1"></i> World </a>
    </div>
  </li>
</ul>

我已经自己尝试了一些方法，并且到目前为止已经将其应用到我的 CSS 中：

老实说，这些只是让它移动的一系列尝试。我看到的问题包括下拉菜单仅在悬停在框本身上时才会扩展，而不是在“提交”按钮上扩展，文本后面的块在悬停时立即显示，而不是从无到有滑出，并且无法使文本后面的块自行扩展；无论我做什么，它都会弹出。

说实话我真的很困惑所以如果能提供任何帮助我将非常感激！

html

1 个回答

  1. Best Answer

    确保下拉菜单默认隐藏

    .navbar-nav .dropdown-menu {
  display: block;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, transform 0.3s ease;
  transform: translateY(-10px); /* Start slightly above */
}

    悬停时显示下拉菜单

    .navbar-nav .nav-item.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0); /* Slide down to its original position */
}

    为动画添加一点延迟以获得更流畅的效果

    .navbar-nav .dropdown-menu {
  transition-delay: 0.1s;
}

    确保下拉菜单在鼠标悬停时保持可见

    .navbar-nav .dropdown-menu:hover {
  opacity: 1;
  visibility: visible;
}


    /* Ensure the dropdown menu is hidden by default */
.navbar-nav .dropdown-menu {
  display: block;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, transform 0.3s ease;
  transform: translateY(-10px);
  /* Start slightly above */
}

/* Show the dropdown menu on hover */
.navbar-nav .nav-item.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  /* Slide down to its original position */
}

/* Optional: Add a slight delay to the animation for a smoother effect */
.navbar-nav .dropdown-menu {
  transition-delay: 0.1s;
}

/* Ensure the dropdown menu stays visible when hovering over it */
.navbar-nav .dropdown-menu:hover {
  opacity: 1;
  visibility: visible;
}
    <!-- Left Nav Section -->
<ul class="navbar-nav mr-auto navbar-left">
  <li class="nav-item">
    <a class="nav-link" href="https://toyhou.se/DeclineOfMySanity">
        <span class="fa fa-home"></span> Profile
      </a>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="https://toyhou.se/~forums">
       <span class="fa fa-comments"></span> Forums
      </a>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" data-toggle="dropdown" data-target="#dropdownBrowse" >
        <span class="fa fa-fw fa-search"></span>
        Browse
      </a>
    <div class="dropdown-menu" id="dropdownBrowse">
      <h6 class="dropdown-header">Characters</h6>
      <a class="dropdown-item" href="https://toyhou.se/~browse/popular"><i class="fa fa-fire fa-fw mr-1"></i> Popular </a>
      <a class="dropdown-item" href="https://toyhou.se/~browse/feed"><i class="fa fa-binoculars fa-fw mr-1"></i> Feed </a>
      <a class="dropdown-item" href="https://toyhou.se/~browse/recent"><i class="fa fa-fw fa-clock mr-1"></i> Recent </a>
      <a class="dropdown-item" href="https://toyhou.se/~browse/search"><i class="fa fa-fw fa-search mr-1"></i> Search </a>
      <h6 class="dropdown-header">Browse</h6>
      <a class="dropdown-item" href="https://toyhou.se/~library/popular"><i class="fa fa-fw fa-book mr-1"></i> Literatures </a>
      <a class="dropdown-item" href="https://toyhou.se/~worlds"><i class="fa fa-fw fa-globe mr-1"></i> Worlds </a>
    </div>
  </li>
  <li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" data-toggle="dropdown" data-target="#dropdownCreate" > <span class="fa fa-fw fa-plus"></span> Submit </a>
    <div class="dropdown-menu" id="dropdownCreate">
      <a class="dropdown-item" href="https://toyhou.se/~characters/create"><i class="fa fa-fw fa-user mr-1"></i> Character </a>
      <a class="dropdown-item" href="https://toyhou.se/~bulletins/create"><i class="fa fa-fw fa-newspaper mr-1"></i> Bulletin </a>
      <a class="dropdown-item" href="https://toyhou.se/~images/upload"><i class="fa fa-fw fa-image mr-1"></i> Image </a>
      <a class="dropdown-item" href="https://toyhou.se/~images/multi-upload"><i class="fa fa-fw fa-image mr-1"></i> Multi-Images </a>
      <a class="dropdown-item" href="https://toyhou.se/~literatures/create"><i class="fa fa-fw fa-book mr-1"></i> Literature </a>
      <a class="dropdown-item" href="https://toyhou.se/~worlds/create"><i class="fa fa-fw fa-globe mr-1"></i> World </a>
    </div>
  </li>
</ul>

    我希望这对你有帮助

    • 3

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