html - 重新使用代码来显示菜单的事件链接

Question

在html中创建菜单的代码

<ul class="menu">
<li class="top"><a href="index.jsp" class="active_link"><span>Home</span></a></li>
<li class="top"><a href="#" class="top_link"><span class="down">Police Station</span></a>
<ul class="sub">
<li><a href="VPolicestation.jsp">Add New Station</a></li>
<li><a href="javascript:searchVPS()">Update Station</a></li>
</ul>
</li>
<li class="top"><a href="#" class="top_link"><span class="down">Police Officer</span></a>
<ul class="sub">
<li><a href="addOfficer.jsp">Add New Officer</a></li>
<li><a href="assignStation.jsp">Assign Station</a></li>
<li><a href="javascript:searchOfficer()">Update Officer</a></li>
</ul>
</li>                                
<li class="top"><a href="#" class="top_link"><span class="down">Report</span></a>
<ul class="sub">
<li><a href="#">Crime Report</a></li>
<li><a href="#">Citizen Report</a></li>
</ul>
</li>                                
<li class="top"><a href="logout.jsp" class="top_link"><span>Logout</span></a></li>
</ul>

菜单.css

.bg {background: url(images/button4.gif);}
.menu {padding:0 0 0 32px; margin:0; list-style:none; height:40px; background:#fff url(images/button1a.gif) repeat-x; position:relative; font-family:arial, verdana, sans-serif; }
.menu li.top {display:block; float:left; position:relative;}
.menu li a.top_link {display:block; float:left; height:40px; line-height:33px; color:#bbb; text-decoration:none; font-size:11px; font-weight:bold; padding:0 0 0 12px; cursor:pointer;}
.menu li a.top_link span {float:left; font-weight:bold; display:block; padding:0 24px 0 12px; height:40px;}
.menu li a.top_link span.down {float:left; display:block; padding:0 24px 0 12px; height:40px; background:url(images/down.gif) no-repeat right top;}
.menu li a.top_link:hover {color:#000; background: url(images/button4.gif) no-repeat;}
.menu li a.top_link:hover span {background:url(images/button4.gif) no-repeat right top;}
.menu li a.top_link:hover span.down {background:url(images/button4.gif) no-repeat right top;}

.menu li:hover > a.top_link {color:#000; background: url(images/button4.gif) no-repeat;}
.menu li:hover > a.top_link span {background:url(images/button4.gif) no-repeat right top;}
.menu li:hover > a.top_link span.down {background:url(images/button4.gif) no-repeat right top;}


.menu li a.active_link {display:block; float:left; height:40px; line-height:33px; color:#bbb; text-decoration:none; font-size:11px; font-weight:bold; padding:0 0 0 12px; cursor:pointer;}
.menu li a.active_link span {float:left; font-weight:bold; display:block; padding:0 24px 0 12px; height:40px;}
.menu li a.active_link span.down {float:left; display:block; padding:0 24px 0 12px; height:40px; background:url(images/down.gif) no-repeat right top;}
.menu li > a.active_link {color:#000; background: url(images/button4.gif) no-repeat;}
.menu li > a.active_link span {background:url(images/button4.gif) no-repeat right top;}
.menu li > a.active_link span.down {background:url(images/button4.gif) no-repeat right top;}

.menu table {border-collapse:collapse; width:0; height:0; position:absolute; top:0; left:0;}

.menu a:hover {visibility:visible;}
.menu li:hover {position:relative; z-index:200;}

.menu ul, 
.menu :hover ul ul, 
.menu :hover ul :hover ul ul,
.menu :hover ul :hover ul :hover ul ul,
.menu :hover ul :hover ul :hover ul :hover ul ul {position:absolute; left:-9999px; top:-9999px; width:0; height:0; margin:0; padding:0; list-style:none;}

.menu :hover ul.sub {left:2px; top:40px; right:2px; background: #fff; padding:3px 0; border:1px solid #999999; white-space:nowrap; width:150px; height:auto;}
.menu :hover ul.sub li {display:block; height:20px; position:relative; float:left; width:150px;}
.menu :hover ul.sub li a {font-weight:normal;display:block; font-size:11px; height:20px; width:148px; line-height:20px; text-indent:5px; color:#000; text-decoration:none; border:3px solid #fff; border-width:0 0 0 3px;}
.menu :hover ul.sub li a.fly {background:#fff url(images/arrow.gif) 80px 7px no-repeat;}
.menu :hover ul.sub li a:hover {background:#999999; color:#fff;}
.menu :hover ul.sub li a.fly:hover {background:#999999 url(images/arrow_over.gif) 80px 7px no-repeat; color:#fff;}
.menu :hover ul li:hover > a.fly {background:#999999 url(images/arrow_over.gif) 80px 7px no-repeat; color:#fff;} 

.menu :hover ul :hover ul,
.menu :hover ul :hover ul :hover ul,
.menu :hover ul :hover ul :hover ul :hover ul,
.menu :hover ul :hover ul :hover ul :hover ul :hover ul
{left:90px; top:-4px; background: #fff; padding:3px 0; border:1px solid 999999; white-space:nowrap; width:93px; z-index:200; height:auto;}

在该代码类中，active_link用于显示当前页面属于特定的菜单选项，top_link类用于显示简单形式的菜单。然后，类down 用于指示特定菜单下的子链接。现在，我想显示特定页面所属的当前事件菜单。

Ex : 如果我在 addOfficer.jsp 页面中，那么，Police Officer 链接应该显示为事件的。

为了实现这一点，我在每个页面中粘贴了相同的代码，只是将类名 top_link 更改为 active_link。而且，它正在增加代码的长度。需要帮助来解决这个问题。提前致谢 !!

菜单截图。

Answer 1

无需再次粘贴所有代码。假设我们希望“Police Officer”选项卡处于事件状态，我们可以向 a 标签添加一个“active”类:

<li class="top"><a href="#" class="top_link active"><span class="down">Police Officer</span></a>

CSS 可能是这样的(使悬停和事件状态相似):

.menu li:hover a.top_link,
.menu li a.top_link:hover,
.menu li a.top_link.active {color:#000; background: url(images/button4.gif) no-repeat;}
.menu li:hover a.top_link span,
.menu li a.top_link:hover span,
.menu li a.top_link.active span {background:url(images/button4.gif) no-repeat right top;}
.menu li:hover a.top_link span.down,
.menu li a.top_link:hover span.down,
.menu li a.top_link.active span.down {background:url(images/button4.gif) no-repeat right top;}

至于active_link CSS，不再需要了。 请注意，我也结合了两种悬停状态。认为它会帮助您重用更多的样式代码。