CSS：悬停时隐藏<ul>

时间：2017-12-08 08:01:17

标签： html css hover

我希望只有当用户将鼠标悬停在“aaa”类的链接上时才会出现类别为“bbb”的菜单（作为下拉菜单...）

我使用css并创建了一些代码：

.aaa:hover .bbb {
  opacity: 1;
}

.bbb {
  opacity: 0;
}

但它没有按预期工作。你可以帮mi去找我错的地方吗？我也试过用display：none＆amp;显示：阻止而不是不透明。

修改：下面的分辨率不起作用，因为我有其他css metods。粘贴它：

.footer {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 1rem;
  text-align: center;
  font: inherit;
  font-size: 10px;
  color: white;
}

a, a:hover, a:active, a:visited {
  color: white;
}

.buttons {
  position: absolute;
  text-align: center;
}

.set:not(:last-child) {
  border-bottom: 1px dotted #aaa;
}

html, body, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
  z-index: 1;
}

/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
  display: block;
}

body {
  line-height: 1;
}

ol, ul {
  list-style: none;
}

blockquote, q {
  quotes: none;
}

blockquote:before, blockquote:after,
q:before, q:after {
  content: '';
  content: none;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* Default Styles 
--------------------------------------------------------------------*/

body {
  background: url('img/denim.png');
  font-family: 'Droid Sans', sans-serif;;
}

.clearfix {
  clear: both;
}

.wrap {
  width: 940px;
  margin: 4em auto;
}

nav {
  background: -webkit-gradient(linear, center top, center bottom, from(#fff), to(#ccc));
  background-image: linear-gradient(#fff, #ccc);
  border-radius: 6px;
  box-shadow: 0px 0px 4px 2px rgba(0,0,0,0.4);
  padding: 0 10px;
  position: relative;
}

.menu li {
  float: left;
  position: relative;
}

.menu li a {
  color: #444;
  display: block;
  font-size: 14px;
  line-height: 20px;
  padding: 6px 12px;
  margin: 8px 8px;
  vertical-align: middle;
  text-decoration: none;
}

.menu li a:hover {
  background: -webkit-gradient(linear, center top, center bottom, from(#ededed), to(#fff));
  background-image: linear-gradient(#ededed, #fff);
  border-radius: 12px;
  box-shadow: inset 0px 0px 1px 1px rgba(0,0,0,0.1);
  color: #222;
}

/* Dropdown styles */

.menu ul {
  position: absolute;
  left: -9999px;
  list-style: none;
  opacity: 0;
  transition: opacity 1s ease;
}

.menu ul li {
  float: none;
}

.menu ul a {
  white-space: nowrap;
}

/* Displays the dropdown on hover and moves back into position */
.menu li:hover ul {
  background: rgba(255,255,255,0.7);
  border-radius: 0 0 6px 6px;
  box-shadow: inset 0px 2px 4px rgba(0,0,0,0.4);
  left: 5px;
  opacity: 1;
}

.aaa:hover .bbb {
  display: block;
}

.bbb {
  display: none;
}

/* Persistant Hover State */

.menu li:hover a {
  background: -webkit-gradient(linear, center top, center bottom, from(#ccc), to(#ededed));
  background-image: linear-gradient(#ccc, #ededed);
  border-radius: 12px;
  box-shadow: inset 0px 0px 1px 1px rgba(0,0,0,0.1);
  color: #222;
}

.menu li:hover ul a {
  background: none;
  border-radius: 0;
  box-shadow: none;
}

.menu li:hover ul li a:hover {
  background: -webkit-gradient(linear, center top, center bottom, from(#eee), to(#fff));
  background-image: linear-gradient(#ededed, #fff);
  border-radius: 12px;
  box-shadow: inset 0px 0px 4px 2px rgba(0,0,0,0.3);
}
<div class="wrap">
  <nav>
    <ul class="menu">
      <li><a href="#"><span class="iconic home"></span> Home</a></li>
      <li><a href="#"><span class="iconic magnifying-glass"></span> newIB</a>
        <ul>
          <li><a href="#">111</a></li>
          <li><a href="#">222</a></li>
          <li><a href="#">333</a></li>
          <li><a href="#">444</a></li>
          <li class="aaa"><a href="www.example.pl">555</a>
            <ul class="bbb">
              <li><a href="https://www.example.pl">test</a></li>
              <li><a href="https://www.example.pl">test</a></li>
              <li><a href="https://www.example.pl">test</a></li>
              <li><a href="https://www.example.pl">test</a></li>
            </ul>
          </li>
        </ul>
      </li>
    </ul>
  </nav>
</div>

2 个答案:

答案 0 :(得分：4)

将.bbb上的课程应用于ul而非li (this is because you're trying to make a drop down and display the entire unordered-list instead of just one of the nested li)，这是课程.aaa的直接孩子，并使用display:none和display:block，如图所示它应该工作正常。给定类.ccc并且底层嵌套ul为.ddd的“newIB”父下拉容器应用相同的标准。

.footer {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 1rem;
  text-align: center;
  font: inherit;
  font-size: 10px;
  color: white;
}

a, a:hover, a:active, a:visited {
    color: white;
}

.buttons {
  position: absolute;
  text-align: center;
}

.set:not(:last-child) {
  border-bottom: 1px dotted #aaa;
}

html, body, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
    z-index: 1;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
    display: block;
}
body {
    line-height: 1;
}
ol, ul {
    list-style: none;
}
blockquote, q {
    quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
    content: '';
    content: none;
}
table {
    border-collapse: collapse;
    border-spacing: 0;
}

/* Default Styles 
--------------------------------------------------------------------*/

body {
    background: url('img/denim.png');
    font-family: 'Droid Sans', sans-serif;;
}

.clearfix {
    clear: both;
}

.wrap {
    width: 940px;
    margin: 4em auto;
}

nav {
    background: -webkit-gradient(linear, center top, center bottom, from(#fff), to(#ccc));
    background-image: linear-gradient(#fff, #ccc);
    border-radius: 6px;
    box-shadow: 0px 0px 4px 2px rgba(0,0,0,0.4);
    padding: 0 10px;
    position: relative;
}

.menu li {
    float: left;
    position: relative;
}

.menu li a {
    color: #444;
    display: block;
    font-size: 14px;
    line-height: 20px;
    padding: 6px 12px;
    margin: 8px 8px;
    vertical-align: middle;
    text-decoration: none;
}

.menu li a:hover {
    background: -webkit-gradient(linear, center top, center bottom, from(#ededed), to(#fff));
    background-image: linear-gradient(#ededed, #fff);
    border-radius: 12px;
    box-shadow: inset 0px 0px 1px 1px rgba(0,0,0,0.1);
    color: #222;
}

/* Dropdown styles */

.menu ul {
    position: absolute;
    list-style: none;
}

.menu ul a {
    white-space: nowrap;
}

/* Displays the dropdown on hover and moves back into position */
.menu li:hover ul {
    background: rgba(255,255,255,0.7);
    border-radius: 0 0 6px 6px;
    box-shadow: inset 0px 2px 4px rgba(0,0,0,0.4);
}

.aaa:hover .bbb {
  display: block;
}

.bbb {
  display: none;
}

.ccc:hover .ddd {
  display: block;
}

.ddd {
  display: none;
}

/* Persistant Hover State */

.menu li:hover a {
    background: -webkit-gradient(linear, center top, center bottom, from(#ccc), to(#ededed));
    background-image: linear-gradient(#ccc, #ededed);
    border-radius: 12px;
    box-shadow: inset 0px 0px 1px 1px rgba(0,0,0,0.1);
    color: #222;
}

.menu li:hover ul a {
    background: none;
    border-radius: 0;
    box-shadow: none;
}

.menu li:hover ul li a:hover {
    background: -webkit-gradient(linear, center top, center bottom, from(#eee), to(#fff));
    background-image: linear-gradient(#ededed, #fff);
    border-radius: 12px;
    box-shadow: inset 0px 0px 4px 2px rgba(0,0,0,0.3);
}
<div class="wrap">

  <nav>
    <ul class="menu">
      <li><a href="#"><span class="iconic home"></span> Home</a></li>
      <li class="ccc"><a href="#"><span class="iconic magnifying-glass"></span> newIB</a>
        <ul class="ddd">
          <li><a href="#">111</a></li>
          <li><a href="#">222</a></li>
          <li><a href="#">333</a></li>
          <li><a href="#">444</a></li>
          <li class="aaa"><a href="www.example.pl">555</a>
            <ul class="bbb">
              <li><a href="https://www.example.pl">test</a></li>
              <li><a href="https://www.example.pl">test</a></li>
              <li><a href="https://www.example.pl">test</a></li>
              <li><a href="https://www.example.pl">test</a></li>
            </ul>
          </li>
        </ul>
      </li>
    </ul>
  </nav>
</div>

修改：因此下拉列表不会像Vxp所指出的那样消失。

答案 1 :(得分：1)

您必须将ul与.bbb li .aaa嵌套在li .bbb { opacity: 0; } .aaa:hover .bbb { opacity: 1; }内：

<nav>
  <ul class="menu">
    <li><a href="#"><span class="iconic home"></span> Home</a></li>
    <li><a href="https://system.aliorbank.pl/sign-in"><span class="iconic magnifying-glass"></span> newIB</a>
      <ul>
        <li><a href="#">111</a></li>
        <li><a href="#">222</a></li>
        <li><a href="#">333</a></li>
        <li><a href="#">444</a></li>
        <li class="aaa"><a href="www.example.pl">555</a>
          <ul>
            <li class="bbb"><a href ="https://www.example.pl">test</a></li>
          </ul>
        </li>
      </ul>
    </li>
  </ul>
</nav>
echo "<script>
            alert('Succes!!!');
          </script>";

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