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如何使用CSS實現的大型下拉式選單

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Jun 21, 2018 pm 05:03 PM

css下拉式選單

下拉選單在許多網頁中都能應用到，這篇文章主要介紹了純CSS實現的大型下拉選單的範例程式碼的相關資料，內容挺不錯的，現在分享給大家，也給大家做個參考。

這是一款純CSS實現的大型下拉式選單。此大型選單使用HTML和純CSS程式碼製作，沒有任何js程式碼，不依賴任意第三方外掛程式。適合用於欄位分類較多的大型網站使用。

HTML結構

該大型選單的HTML結構如下：

<nav>
  <ul class="container ul-reset">
    <li><a href=&#39;#&#39;>Home</a></li>
    <li class=&#39;droppable&#39;>
      <a href=&#39;#&#39;>Category One</a>
      <p class=&#39;mega-menu&#39;>
        <p class="container cf">
          <ul class="ul-reset">
            <h3 id="Heading-nbsp">Heading 1</h3>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
          </ul><!-- .ul-reset -->
          <ul class="ul-reset">
            <h3 id="Heading-nbsp">Heading 2</h3>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
          </ul><!-- .ul-reset -->
          <ul class="ul-reset">
            <h3 id="Heading-nbsp">Heading 3</h3>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
            <li><a href=&#39;#&#39;>Category One Sublink</a></li>
          </ul><!-- .ul-reset -->
          <ul class="ul-reset">
            <h3 id="Heading-nbsp">Heading 4</h3>
            <li><img  src="/static/imghwm/default1.png"  data-src="http://placehold.it/205x172"  class="lazy"   alt="如何使用CSS實現的大型下拉式選單" ></li>
          </ul>
        </p><!-- .container -->
      </p><!-- .mega-menu -->
    </li><!-- .droppable -->
    <li class=&#39;droppable&#39;>
      <a href=&#39;#&#39;>Category Two</a>
      <p class=&#39;mega-menu&#39;>
        <p class="container cf">
          <ul class="ul-reset">
            <h3 id="Heading-nbsp">Heading 1</h3>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
          </ul><!-- .ul-reset -->
          <ul class="ul-reset">
            <h3 id="Heading-nbsp">Heading 2</h3>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
          </ul><!-- .ul-reset -->
          <ul class="ul-reset">
            <h3 id="Heading-nbsp">Heading 3</h3>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
          </ul><!-- .ul-reset -->
          <ul class="ul-reset">
            <h3 id="Heading-nbsp">Heading 4</h3>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
            <li><a href=&#39;#&#39;>Category Two Sublink</a></li>
          </ul><!-- .ul-reset -->
        </p><!-- .container -->
      </p><!-- .mega-menu-->
    </li><!-- .droppable -->
    <li><a href=&#39;#&#39;>Category Three</a></li>
    <li><a href=&#39;#&#39;>Category Four</a></li>
    <li><a href=&#39;#&#39;>Category Five</a></li>
    <li><a href=&#39;#&#39;>Category Six</a></li>
  </ul><!-- .container .ul-reset -->
</nav>

CSS

為該大型選單加入下面的CSS樣式：

/* #Resets
–––––––––––––––––––––––––––––––––––––––––––––––––– */
html {box-sizing: border-box;}
*, *:before, *:after {box-sizing: inherit;  }
/* #Universal and Default Styles
–––––––––––––––––––––––––––––––––––––––––––––––––– */
body {
    background: url(../img/black-wood-small.jpg);
    color: #ddd;
    font-family: "Open Sans", sans-serif;
    font-size: 14px;
  line-height: 1;
  margin: 0;
  padding: 0;
  text-align: center;
}
a {text-decoration: none;}
h1 {
  font-size: 40px;
    font-weight: 700;
  margin-bottom: 20px;
    margin-top: 20px;
}
h2 {
  font-size: 15px;
    font-weight: 600;
  margin-bottom: 30px;
    margin-top: 10px;
}
.container {
  margin: auto;
  width: 940px;
}
.ul-reset {
  padding-left: 0;
   margin-top: 0;
   margin-bottom: 0;
  list-style: none;
}
/* #Navigation Styles
–––––––––––––––––––––––––––––––––––––––––––––––––– */
nav {
  background: #424242;
  font-size: 0;
  position: relative;
}
nav > ul > li {
  display: inline-block;
    font-size: 14px;
    padding: 0 15px;
    position: relative;
}
nav > ul > li:first-child {padding-left: 0;}
nav > ul > li:last-child {padding-right: 0;}
nav > ul > li > a {
  color: #fff;
    display: block;
    position: relative;
    padding: 20px 0;
    border-bottom: 3px solid transparent;
}
nav > ul > li:hover > a {
  color: #69aae0; 
    border-bottom: 3px solid #69aae0;
}
/* #Mega Menu Styles
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.mega-menu {
  background: #f0f0f0;
    display: none;
    left: 0;
    position: absolute;
    text-align: left;
    width: 100%;
}
.mega-menu h3 {color: #444;}
.mega-menu ul {
  float: left;
    margin-bottom: 20px;
    margin-right: 40px;
    width: 205px;
}
.mega-menu ul:last-child {margin-right: 0;}
.mega-menu a {
  border-bottom: 1px solid #ddd;
    color: #4ea3d8;
    display: block;
    padding: 10px 0;
}
.mega-menu a:hover {color: #2d6a91;}
/* #Droppable Class Styles
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.droppable {position: static;}
.droppable > a:after {
  content: "\f107";
    font-family: FontAwesome;
    font-size: 12px;
    padding-left: 6px;
    position: relative;
    top: -1px;
}
.droppable:hover .mega-menu {display: block;}
/* #Browser Clearfix
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.cf:before,
.cf:after {
  content: " "; /* 1 */
   display: table; /* 2 */
}
.cf:after {clear: both;}

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