這次帶給大家CSS實現大型下拉選單步驟詳解，CSS實作大型下拉選單的注意事項有哪些，下面就是實戰案例，一起來看一下。
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='#'>Home</a></li> <li class='droppable'> <a href='#'>Category One</a> <p class='mega-menu'> <p class="container cf"> <ul class="ul-reset"> <h3>Heading 1</h3> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> </ul><!-- .ul-reset --> <ul class="ul-reset"> <h3>Heading 2</h3> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> </ul><!-- .ul-reset --> <ul class="ul-reset"> <h3>Heading 3</h3> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> <li><a href='#'>Category One Sublink</a></li> </ul><!-- .ul-reset --> <ul class="ul-reset"> <h3>Heading 4</h3> <li><img src="http://placehold.it/205x172"></li> </ul> </p><!-- .container --> </p><!-- .mega-menu --> </li><!-- .droppable --> <li class='droppable'> <a href='#'>Category Two</a> <p class='mega-menu'> <p class="container cf"> <ul class="ul-reset"> <h3>Heading 1</h3> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> </ul><!-- .ul-reset --> <ul class="ul-reset"> <h3>Heading 2</h3> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> </ul><!-- .ul-reset --> <ul class="ul-reset"> <h3>Heading 3</h3> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> </ul><!-- .ul-reset --> <ul class="ul-reset"> <h3>Heading 4</h3> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> <li><a href='#'>Category Two Sublink</a></li> </ul><!-- .ul-reset --> </p><!-- .container --> </p><!-- .mega-menu--> </li><!-- .droppable --> <li><a href='#'>Category Three</a></li> <li><a href='#'>Category Four</a></li> <li><a href='#'>Category Five</a></li> <li><a href='#'>Category Six</a></li> </ul><!-- .container .ul-reset --> </nav>
CSS
為該大型選單添加下面的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;}相信看了本文案例你已經掌握了方法，更多精彩請關注php中文網其它相關文章！
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以上是CSS實現大型下拉式選單步驟詳解的詳細內容。更多資訊請關注PHP中文網其他相關文章！
