Multi-level CSS3 UL_LI Dropdown Menu

https://www.script-tutorials.com/click-action-multilevel-css3-dropdown-menu/

Step 1. HTML

As usual, we start with the HTML.

Here are full html code with our menu. As you can see – this is multi-level menu. I hope that you can easy to understand it. Whole menu built on UL-LI elements.

index.html

<link rel="stylesheet" href="css/style.css" type="text/css" media="screen">
<div class="example">
    <ul id="nav">
        <li><a href="https://www.script-tutorials.com/">Home</a></li>
        <li><a class="fly" href="#" tabindex="1">Tutorials</a>
            <ul class="dd">
                <li><a href="https://www.script-tutorials.com/category/html-css/">HTML / CSS</a></li>
                <li><a class="fly" href="#" tabindex="1">JS / jQuery</a>
                    <ul>
                        <li><a href="https://www.script-tutorials.com/category/jquery/">jQuery</a></li>
                        <li><a href="https://www.script-tutorials.com/category/javascript/">JS</a></li>
                    </ul>
                </li>
                <li><a href="https://www.script-tutorials.com/category/php/">PHP</a></li>
                <li><a href="https://www.script-tutorials.com/category/mysql/">MySQL</a></li>
                <li><a href="https://www.script-tutorials.com/category/xslt/">XSLT</a></li>
                <li><a href="https://www.script-tutorials.com/category/ajax/">Ajax</a></li>
            </ul>
        </li>
        <li><a class="fly" href="#" tabindex="1">Resources</a>
            <ul class="dd">
                <li><a class="fly" href="#" tabindex="1">By category</a>
                    <ul>
                        <li><a href="https://www.script-tutorials.com/category/php/">PHP</a></li>
                        <li><a href="https://www.script-tutorials.com/category/mysql/">MySQL</a></li>
                        <li><a class="fly" href="#" tabindex="1">Menu1</a>
                            <ul>
                                <li><a href="#">Menu1</a></li>
                                <li><a href="#">Menu2</a></li>
                                <li><a class="fly" href="#" tabindex="1">Menu3</a>
                                    <ul>
                                        <li><a href="#">Menu31</a></li>
                                        <li><a href="#">Menu32</a></li>
                                        <li><a href="#">Menu33</a></li>
                                        <li><a href="#">Menu34</a></li>
                                    </ul>
                                </li>
                                <li><a href="#">Menu4</a></li>
                            </ul>
                        </li>
                        <li><a href="https://www.script-tutorials.com/category/ajax/">Ajax</a></li>
                    </ul>
                </li>
                <li><a class="fly" href="#" tabindex="1">By tag name</a>
                    <ul>
                        <li><a href="https://www.script-tutorials.com/tag/captcha/">captcha</a></li>
                        <li><a href="https://www.script-tutorials.com/tag/gallery/">gallery</a></li>
                        <li><a href="https://www.script-tutorials.com/tag/animation/">animation</a></li>
                    </ul>
                </li>
            </ul>
        </li>
        <li><a href="https://www.script-tutorials.com/about/">About</a></li>
        <li><a href="https://www.script-tutorials.com/click-action-multilevel-css3-dropdown-menu/">Go Back To The Tutorial</a></li>
    </ul>
</div>

Step 2. CSS

Here are used CSS styles. First two selectors – layout of our demo page. All rest – belong to menu.

css/style.css

/* demo page styles */
body {
    background:#eee;
    margin:0;
    padding:0;
}
.example {
    background:#fff url(../images/tech.jpg);
    770px;
    height:570px;
    border:1px #000 solid;
    margin:20px auto;
    padding:15px;
    border-radius:3px;
    -moz-border-radius:3px;
    -webkit-border-radius:3px;
}
/* main menu styles */
#nav,#nav ul {
    background-image:url(../images/tr75.png);
    list-style:none;
    margin:0;
    padding:0;
}
#nav {
    height:41px;
    padding-left:5px;
    padding-top:5px;
    position:relative;
    z-index:2;
}
#nav ul {
    left:-9999px;
    position:absolute;
    top:37px;
    auto;
}
#nav ul ul {
    left:-9999px;
    position:absolute;
    top:0;
    auto;
}
#nav li {
    float:left;
    margin-right:5px;
    position:relative;
}
#nav li a {
    background:#c1c1bf;
    color:#000;
    display:block;
    float:left;
    font-size:16px;
    padding:8px 10px;
    text-decoration:none;
}
#nav > li > a {
    -moz-border-radius:6px;
    -webkit-border-radius:6px;
    -o-border-radius:6px;
    border-radius:6px;
    overflow:hidden;
}
#nav li a.fly {
    background:#c1c1bf url(../images/arrow.gif) no-repeat right center;
    padding-right:15px;
}
#nav ul li {
    margin:0;
}
#nav ul li a {
    120px;
}
#nav ul li a.fly {
    padding-right:10px;
}
/*hover styles*/
#nav li:hover > a {
    background-color:#858180;
    color:#fff;
}
/*focus styles*/
    #nav li a:focus {
    outline-0;
}
/*popups*/
#nav li a:active + ul.dd,#nav li a:focus + ul.dd,#nav li ul.dd:hover {
    left:0;
}
#nav ul.dd li a:active + ul,#nav ul.dd li a:focus + ul,#nav ul.dd li ul:hover {
    left:140px;
}

Step 3. Images

Our menu using only three images: arrow.gif, tech.jpg and tr75.png. I don`t included them into tutorial, just because two of them very small (will difficult to locate it) and last one – just background image. All images will in package.


Live Demo
原文地址:https://www.cnblogs.com/wfy680/p/14335475.html