CSS 在类之间切换后转换不起作用

Question

我创建了一个切换菜单，我使用了我的真实项目源代码，所以不会混淆:-

div.btn-dropdown-options {
    font-family: "Haas Grot Text R Web", "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 14px;
    font-weight: 400;
    line-height: 20px;
    
    position: absolute;
    z-index: 1;
    bottom: calc(100% + 8px);
    left: 0;
    min-width: 180px;
    margin-top: 4px;

    padding: 8px;
    
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 8px;
    background: #fff;
    display: none;
    
    -webkit-box-shadow: 0 0 5px 1px rgb(0 0 0 / 10%);
    box-shadow: 0 0 5px 1px rgb(0 0 0 / 10%);
}


full code: - https://jsfiddle.net/bnpehzjw/

.

我为 div.btn-dropdown-options 添加了一个 css 过渡效果，并且我使用了 visibility: hidden; 到 可见性：可见；.

当我单击菜单切换按钮以显示菜单时，转换效果很好。但是，当我再次单击菜单切换按钮以隐藏菜单时，转换不起作用。

我做错了什么？

Answer 1

长话短说；博士。请参阅下面的代码片段，它是从您的原始代码中略微调整的。

一些注意事项：

考虑使用 button 而不是 a 标签。 这是一个按钮 单击时执行某些操作 而不是 hyperlink 单击时指向 link。
小心过于具体的 CSS 规则。 div.button-dropdown-options（即元素名称 + class 名称）比 .button-dropdown-options（即 class 仅名称）更具体，并且可以胜过其他 不太具体的 选择器。这就是让你在多个地方过度依赖 !important 的原因。过于具体和 !important 的组合将使调试样式变得非常困难。
visibility 也是 transition 属性的一部分。 也就是说，类似于 transition: opacity 2s, visibility 2s;

function showDropDown() {
  const variantButton = document.getElementById('showdropdown');
  const variantMenu = document.getElementById('variantMenu');
  const animate_arrow = document.querySelector('.btn-dropdown-caret');
  const options = document.querySelector('.btn-dropdown-options');
  const over = document.querySelector('.swiper-container');
  const calculatedOptions = window.getComputedStyle(options);

  variantButton.addEventListener('click', function(event) {
    variantMenu.classList.toggle('dropdownShow');
    animate_arrow.classList.toggle('animate-arrow');
  });

}
showDropDown();

.btn-dropdown {
  display: block;
  position: relative;
  white-space: nowrap;
  margin-top: 5px;
  margin-left: 2px;
}

@media screen and (min-width: 768px) {
  .btn-dropdown {
    z-index: 4;
  }
}

.btn-dropdown .btn-dropdown-link {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  width: 100%;
}

.form-btn.outlined.btn-dropdown-link {
  font-family: "Haas Grot Text R Web", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 14px;
  font-weight: 400;
  line-height: 20px;
  /* -webkit-transition: color 200ms ease;
    transition: color 200ms ease; */
  border: 1px solid #dddddd;
  box-shadow: none;
  -webkit-touch-callout: none;
  /* iOS Safari */
  -webkit-user-select: none;
  /* Safari */
  -khtml-user-select: none;
  /* Konqueror HTML */
  -moz-user-select: none;
  /* Old versions of Firefox */
  -ms-user-select: none;
  /* Internet Explorer/Edge */
  user-select: none;
  /* Non-prefixed version, currently */
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94) !important;
  color: #6e6d7a;
}

.form-btn.outlined.btn-dropdown-link:hover,
.form-btn.outlined.btn-dropdown-link:focus {
  border: 1px solid #e4b29b;
  color: #1b1b1b;
  box-shadow: 0 0 0 2px rgb(228 178 155 / 10%);
}

.form-btn.outlined.btn-dropdown-link:hover svg,
.form-btn.outlined.btn-dropdown-link:focus svg {
  fill: #666666;
}

.animate-arrow {
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  transform: translateY(-50%) rotate(180deg) !important;
}

.form-btn.outlined,
a.form-btn.outlined {
  background-color: transparent;
  -webkit-box-shadow: 0px 0px 0px 1px #e7e7e9 inset;
  box-shadow: 0px 0px 0px 1px #e7e7e9 inset;
  color: #0d0c22;
}

.btn-dropdown .btn-dropdown-link {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  padding-right: 35px;
  text-align: left;
}

.form-btn,
a.form-btn {
  background: #f3f3f4;
  color: #0d0c22;
}

.form-btn,
a.form-btn {
  display: inline-block;
  position: relative;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  height: 40px;
  padding: 10px 16px;
  -webkit-transition: color 200ms ease;
  transition: color 200ms ease;
  border: none;
  border-radius: 10px;
  outline: none;
  background: #ea4c89;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  font-family: "Haas Grot Text R Web", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 14px;
  font-weight: 500;
  line-height: 20px;
}


/* Variant Selector --Span */

.btn-dropdown.btn-dropdown-neue svg.btn-dropdown-caret {
  fill: #9e9ea7;
}

.btn-dropdown svg.btn-dropdown-caret {
  position: absolute;
  top: 50%;
  right: 15px;
  width: 10px;
  height: 10px;
  margin: 0;
  -webkit-transform: translateY(-50%) rotate(0deg);
  -ms-transform: translateY(-50%) rotate(0deg);
  transform: translateY(-50%) rotate(0deg);
  -webkit-transition: -webkit-transform 0.2s ease-in-out;
  transition: -webkit-transform 0.2s ease-in-out;
  transition: transform 0.2s ease-in-out;
  transition: transform 0.2s ease-in-out, -webkit-transform 0.2s ease-in-out;
  fill: currentColor;
}

.form-btn svg,
button.form-btn svg {
  width: 13px;
  height: 13px;
  margin-top: -3px;
  margin-right: 2px;
  fill: currentColor;
  vertical-align: middle;
}


/* DropDown */

.btn-dropdown .btn-dropdown-options {
  right: 0;
}

.btn-dropdown div.btn-dropdown-options {
  z-index: 2;
}

.btn-dropdown-options {
  font-family: "Haas Grot Text R Web", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 14px;
  font-weight: 400;
  line-height: 20px;
  position: absolute;
  z-index: 1;
  top: calc(100% + 8px);
  left: 0;
  min-width: 180px;
  margin-top: 4px;
  overflow: auto;
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: 8px;
  background: #fff;
  visibility: hidden;
  opacity: 0;
  transition: opacity 2s, visibility 2s;
  box-shadow: 0px 1px 2px rgba(128, 138, 157, 0.12), 0px 8px 32px rgba(128, 138, 157, 0.24);
}

.btn-dropdown-options ul {
  padding: 8px 0;
  list-style: none;
}

.btn-dropdown-options li.active a {
  color: #ea4c89;
  font-weight: 500;
  text-decoration: none;
}

.btn-dropdown-options a {
  display: block;
  padding: 8px 15px;
  color: #6e6d7a;
  font-size: 13px;
  text-decoration: none;
}



.btn-dropdown-options.dropdownShow {
  /* animation: 0.3s ease 0s 1 normal forwards running dropdownAnimation !important; */
  visibility: visible;
  opacity: 1;
}

.visuallyhidden {
  opacity: 0;
}

<span class="btn-dropdown btn-dropdown-neue">
  <button id="showdropdown" class="form-btn outlined btn-dropdown-link" data-dropdown-state="closed">
    <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" role="img" class="icon btn-dropdown-caret">
      <path d="M21.5265 8.77171C22.1578 8.13764 22.1578 7.10962 21.5265 6.47555C20.8951 5.84148 19.8714 5.84148 19.24 6.47555L11.9999 13.7465L4.75996 6.47573C4.12858 5.84166 3.10492 5.84166 2.47354 6.47573C1.84215 7.10979 1.84215 8.13782 2.47354 8.77188L10.8332 17.1671C10.8408 17.1751 10.8486 17.183 10.8565 17.1909C11.0636 17.399 11.313 17.5388 11.577 17.6103C11.5834 17.6121 11.5899 17.6138 11.5964 17.6154C12.132 17.7536 12.7242 17.6122 13.1435 17.1911C13.1539 17.1807 13.1641 17.1702 13.1742 17.1596L21.5265 8.77171Z"></path>
    </svg>
    <span data-prompt="Variant" data-fade-default="true" class="default-option">
      Sandle Brown
    </span>
</button>

<div id="variantMenu" class="btn-dropdown-options sets-querystring">
  <ul>
    <li class="default-filter-option active"><a href="?timeframe=">Now</a></li>
    <li class="default-filter-option active"><a href="?timeframe=">Now</a></li>
    <li class="default-filter-option active"><a href="?timeframe=">Now</a></li>
    <li class="default-filter-option"><a href="?timeframe=">Now</a></li>
    <li class="default-filter-option"><a href="?timeframe=">Now</a></li>
    <li class="default-filter-option"><a href="?timeframe=">Now</a></li>
  </ul>
</div>
</span>

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