网页导航菜单弹出子菜单的制作
水平方向的PopMenu-弹出菜单（DIV+CSS+JS）
此POPMENU根据alistapart的articles改编，比DW中用显示、隐藏层的方法要简单。在IE6.0 IE5.X Firefox NS都能正确显示，只用到很少的JS代码，使用时只要把<ul></ul>部分插入需要的地方即可，不会因分辨率不同而发生错位的现象。
水平式菜单鼠标经过时弹出子菜单：
参考代码：
<STYLE type=text/css>
li ul {
display: none; left: -40px; position: absolute; top: 24px;
width: 490px; /*opera需要这个宽度，可根据导航条的实际宽度作调整*/
}
li ul li{
display: inline;
}
li ul li a{
background: url(h_line.gif) no-repeat 0px 7px; color: #666666;
font-weight: normal; padding: 6px; text-align: left;
}
li ul li a:hover{
background: url(h_line.gif) no-repeat 0px 7px; color: #DC4E1B; text-decoration: underline;
}
li ul,li ul li{
border: 0px;
}
li:hover ul, li.over ul,ul li:hover {
display: block;
}
ul {
list-style: none; margin: 0px; padding: 0px; font: normal 11px verdana;
}
ul li {
border: solid 1px #CCCCCC; border-left: 0px; float: left; position: relative;
}
ul li a {
background: #F5F5F5; color: #666666; display: block; font-weight: bold;
padding: 5px 10px; text-align: center; text-decoration: none;
}
ul li a:hover {
background: #DC4E1B; color: #FFFFFF;
}
.left{
height: 24px; width: 1px;
}
</STYLE>
html:
<ul id="nav">
<li class="left"></li><li><a href="#">Home</a></li>
<li><a href="#">About</a><ul> <li><a href="#">Sub menu 21</a>
</li><li><a href="#">Sub menu 22</a></li> <li><a href="#">
Sub menu 23</a></li><li><a href="#">Sub menu 24</a></li> </ul>
</li> <li><a href="#">Products</a><ul><li><a href="#">Sub menu 31
</a></li> <li><a href="#">Sub menu 32</a></li> <li><a href="#">
Sub menu 33</a></li> <li><a href="#">Sub menu 34</a></li></ul>
</li> <li><a href="#">Services</a><li><a href="#">Contact Us
</a></li>
</ul>
<script type="text/javascript">
<!--
startList = function() {
if (document.all&&document.getElementById) {
navRoot = document.getElementById("nav");
for (i=0; i<navRoot.childNodes.length; i++) {
node = navRoot.childNodes[i];
if (node.nodeName=="LI") {
node.onmouseover=function() {
this.className+=" over";
}
node.onmouseout=function() {
this.className=this.className.replace(" over", "");
}
}
}
}
}
window.onload=startList;
--></script>
垂直式菜单鼠标经过时弹出子菜单：
参考代码：
<STYLE type=text/css>
body {
font-family: Arial, Helvetica, sans-serif; font-size: 11px;
}
#nav, #nav ul {
list-style: none; background: #F9F9F9; font-weight: bold;
padding: 0px; margin: 0px; border: solid 1px #CCCCCC; border-bottom: 0px;
width: 180px; text-align: left;
}
#nav ul ul{
border: solid 1px #CCCCCC;
border-bottom: 0px;
}
#nav a {
display: block; width: 180px; w\idth: 180px;
color: #333333; text-decoration: none; text-align: center;
border-bottom: solid 1px #CCCCCC; text-align: left;
padding-left: 10px;
}
#nav a:hover{ color: #336666; }
#nav a.selected{
background: url(../images/arrow.gif) no-repeat right 50%;
}
#nav li {
line-height: 22px; position: relative;
}
#nav li ul {
position: absolute;
left: -99em; width: 150px; font-weight: normal;
margin: 0px; padding: 0px;
}
#nav li li { width: 150px; }
#nav li ul a {
width: 150px;
w\idth: 126px;
padding: 0px 12px;
line-height: 22px;
text-align: left;
}
#nav li ul ul {
margin: 0px 0 0 150px;
}
#nav li:hover ul ul,#nav li.sfhover ul ul{
left: -999em;
}
#nav li:hover ul, #nav li li:hover ul,#nav li.sfhover ul, #nav li li.sfhover ul{
left: auto;
}
#nav li:hover ul,#nav li.sfhover ul{
left: 180px; top: 0px;
}
#nav li:hover, #nav li.sfhover {
background: #F5E3C0;
}
* html #nav li {
float: left;
height: 1%;
}
* html #nav li a {
height: 1%;
}
</STYLE>
<script type="text/javascript">
<!--
sfHover = function() {
var sfEls = document.getElementById("nav").getElementsByTagName("LI");
for (var i=0; i<sfEls.length; i++) {
sfEls[i].onmouseover=function() {
this.className+=" sfhover";
}
sfEls[i].onmouseout=function() {
this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
}
}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);
--></script>
<body>
<ul id="nav">
<li><a href="">Home</a></li>
<li><a href="/aboutme.html">About Me</a></li>
<li><a class="selected" href="/tutorials.html">Tutorials</a>
<ul>
<li><a href="#">Sub Menu 31</a></li>
<li><a class="selected" href="#">Sub Menu 32</a>
<ul>
<li><a href="#">Sub Menu 321</a></li>
<li><a href="#">Sub Menu 322</a></li>
<li><a href="#">Sub Menu 323</a></li>
<li><a href="#">Sub Menu 324</a></li>
</ul>
</li>
<li><a href="#">Sub Menu 33</a></li>
<li><a href="#">Sub Menu 34</a></li>
</ul>
</li>
<li><a class="selected" href="/gallery/gallery.html">Gallery</a>
<ul>
<li><a href="#">Sub Menu 41</a></li>
<li><a class="selected" href="#">Sub Menu 42</a>
<ul>
<li><a href="#">Sub Menu 421</a></li>
<li><a href="#">Sub Menu 422</a></li>
<li><a href="#">Sub Menu 423</a></li>
<li><a href="#">Sub Menu 424</a></li>
</ul>
</li>
<li><a href="#">Sub Menu 43</a></li>
<li><a href="#">Sub Menu 44</a></li>
</ul>
</li>
<li><a href="#">Contact Me</a></li>
</ul>
</body>
