html - 如何更改此 CSS 以减少下拉效果的错误？

Question

我在下面提供了我的 CSS 和 HTML。我正在尝试完成我的下拉菜单，但它存在一个问题，导致过渡不那么顺利。很难用语言来解释它在做什么。

我尝试更改display, max-height, padding,margin但没有任何结果。也许我需要添加一些 JavaScript 而不是 CSS？任何可以指出的建议或问题都会很棒。

#navigation {
	height: 100px;
	padding: 10px 3px 3px;
	background-color: #FFF;
	margin-bottom: 210px;
	border-radius: 5px;
}

#nav-container {
	display: table;
	margin: 10px auto;
}

#nav-items {
	list-style-type: none;
	margin-left: -45px;
	margin-top: -26px;
}

#nav-items li {
	display: inline-block;
	vertical-align: top;
	width: 400px;
}

/* nav-dropdown */

#dropdown {
	display: block;
	position: absolute;
	text-align: center;
	width: 300px;
	height: 50px;
}

#dropdown p { 
	font-family: 'Work Sans', sans-serif; 
	font-size: 35px;
	letter-spacing: 5px;
	display: table-cell;
	margin: 0;
	cursor: pointer;
	background-color: transparent;
	text-align: center;
}


#extensions {
	display: table;
	border-collapse: separate;
	border-spacing: 40px;
	height: 50px;
	width: 350px;
}

.label {
	font-family: 'Work Sans', sans-serif; 
	font-size: 35px;
	letter-spacing: 5px;
	text-align: center;
	position: absolute;
  width: 300px;
}

#dropdown-content {
	position: absolute;
	margin: 0 auto;
	opacity: 0;
  width: 300px;
	height: 50px;
	background-color: #C9C9C9; 
	border-radius: 8px;
	box-shadow: 1px 1px 50px 0px white;
	z-index: 1;
	overflow-y: hidden;
	transition-property: all;
	transition-duration: 0.5s;
	transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
}

.nav-dropdown-container {width: 350px;height: 800px;}

#dropdown-content p {
	font-size: 20px;
	font-family: 'Work Sans', sans-serif; 
	font-size: 30px;
	letter-spacing: 2px;
}
#dropdown-content:hover {
	opacity: 1;
	max-height: 500px;
	padding-top: 1em;
  	padding-bottom: 1em;
	margin-top: 50px;
	-webkit-transition: all 0.5s ease-in-out;
    -moz-transition: all 0.5s ease-in-out;
    -o-transition: all 0.5s ease-in-out;
    transition: all 0.5s ease-in-out;
	display: block;
}

#dropdown-content:hover p {
	display: block;
	text-decoration: none;
	transition: 0.5s;
}

#dropdown-content p {display: none;}

#dropdown-link {color: white;}

#dropdown-link:link {
	color: white;
	text-decoration: none;
}

#dropdown-link:hover {
	color: lightgrey;
}

<nav id="navigation">
			<div id="nav-container">
				<ul id="nav-items">
					<li>
						<div id="extensions">
							<div class="nav-dropdown-container">
								<div id="dropdown">
									<p class="label">TEST</p>
									<div id="dropdown-content">
										<p><a id="dropdown-link" href="hello.html">HELLO</a></p>
										<p><a  id="dropdown-link" href="world.html">WORLD</a></p>
									</div>
								</div>
							</div>
						</div>
					</li>
      </ul>
    </div>
</nav>

标签： htmlcss

Answer 1

正如评论中所说，原因是当:hover状态被触发时#dropdown-content，鼠标光标快速进入和离开元素导致状态反复快速切换和关闭，从而导致过渡卡顿。

最快的解决方法是：您应该更改选择器，以便将:hover状态绑定到标签和下拉内容的最近共同祖先，即#dropdown.

所以你应该改变这个：

#dropdown-content:hover { ... }
#dropdown-content:hover p { ... }

...对此：

#dropdown:hover #dropdown-content { ... }
#dropdown:hover #dropdown-content p { ... }

这当然是一个权宜之计，因为我发现您的标记不必要地臃肿以实现简单的下拉效果。

#navigation {
  height: 100px;
  padding: 10px 3px 3px;
  background-color: #FFF;
  margin-bottom: 210px;
  border-radius: 5px;
}

#nav-container {
  display: table;
  margin: 10px auto;
}

#nav-items {
  list-style-type: none;
  margin-left: -45px;
  margin-top: -26px;
}

#nav-items li {
  display: inline-block;
  vertical-align: top;
  width: 400px;
}


/* nav-dropdown */

#dropdown {
  display: block;
  position: absolute;
  text-align: center;
  width: 300px;
  height: 50px;
}

#dropdown p {
  font-family: 'Work Sans', sans-serif;
  font-size: 35px;
  letter-spacing: 5px;
  display: table-cell;
  margin: 0;
  cursor: pointer;
  background-color: transparent;
  text-align: center;
}

#extensions {
  display: table;
  border-collapse: separate;
  border-spacing: 40px;
  height: 50px;
  width: 350px;
}

.label {
  font-family: 'Work Sans', sans-serif;
  font-size: 35px;
  letter-spacing: 5px;
  text-align: center;
  position: absolute;
  width: 300px;
}

#dropdown-content {
  position: absolute;
  margin: 0 auto;
  opacity: 0;
  width: 300px;
  height: 50px;
  background-color: #C9C9C9;
  border-radius: 8px;
  box-shadow: 1px 1px 50px 0px white;
  z-index: 1;
  overflow-y: hidden;
  transition-property: all;
  transition-duration: 0.5s;
  transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
}

.nav-dropdown-container {
  width: 350px;
  height: 800px;
}

#dropdown-content p {
  font-size: 20px;
  font-family: 'Work Sans', sans-serif;
  font-size: 30px;
  letter-spacing: 2px;
}

#dropdown:hover #dropdown-content {
  opacity: 1;
  max-height: 500px;
  padding-top: 1em;
  padding-bottom: 1em;
  margin-top: 50px;
  -webkit-transition: all 0.5s ease-in-out;
  -moz-transition: all 0.5s ease-in-out;
  -o-transition: all 0.5s ease-in-out;
  transition: all 0.5s ease-in-out;
  display: block;
}

#dropdown:hover #dropdown-content p {
  display: block;
  text-decoration: none;
  transition: 0.5s;
}

#dropdown-content p {
  display: none;
}

#dropdown-link {
  color: white;
}

#dropdown-link:link {
  color: white;
  text-decoration: none;
}

#dropdown-link:hover {
  color: lightgrey;
}

<nav id="navigation">
  <div id="nav-container">
    <ul id="nav-items">
      <li>
        <div id="extensions">
          <div class="nav-dropdown-container">
            <div id="dropdown">
              <p class="label">TEST</p>
              <div id="dropdown-content">
                <p><a id="dropdown-link" href="hello.html">HELLO</a></p>
                <p><a id="dropdown-link" href="world.html">WORLD</a></p>
              </div>
            </div>
          </div>
        </div>
      </li>
    </ul>
  </div>
</nav>