CSS实例讲解:地图提示

来源：Linuxdby.com 作者：Webmaster 时间：2007-04-28 点击： [收藏] [投稿]

作者的BLOG：http://www.planabc.net/

地图弹窗（map pop）具体演示

代码框
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>CSS实例讲解：地图提示（map pop）档</title>
<style type="text/css" media="all">
* {
margin:0;
padding:0;
}

img {
border:0;
}

#show{
text-align:left;
}

ul {
list-style-type:none;
background: transparent url(/articleimg/2007/03/4514/map_flat.jpg) no-repeat 0 0;
width:350px;
height:250px;
border:1px solid #000;
}

ul li {
display:inline;
}

ul li a {
position:relative;
display:block;
text-decoration:none;
}

ul li a span.offset {
position:absolute;
margin-top:-9000px;
margin-left:-9000px;
}

ul li a:hover span.offset, ul li a:focus span.offset, ul li a:active span.offset {
color: #000;
background-image:none;
background-color:#ffffde;
border:1px solid #000;
display:block;
width:150px;
height:auto;
text-decoration:none;
cursor:pointer;
}

ul li a:hover span.offset span, ul li a:focus span.offset span, ul li a:active span.offset span {
display:block;
width:140px;
margin:5px;
height:120px;
}

ul li a#map01 {
width:80px;
height:60px;
margin-top:0;
margin-left:130px;
}

ul li a#map01:hover, ul li a#map01:focus, ul#cmp li a#map01:active {
background:transparent url(/articleimg/2007/03/4514/map_flat_on.jpg) no-repeat -130px 0px;
}

ul li a#map01:hover span.offset, ul li a#map01:focus span.offset, ul li a#map01:active span.offset {
margin-top:-1px;
margin-left:230px;
}

ul li a#map02 {
width:110px;
height:75px;
margin-top:-50px;
margin-left:235px;
}

ul li a#map02:hover, ul li a#map02:focus, ul li a#map02:active {
background:transparent url(/articleimg/2007/03/4514/map_flat_on.jpg) no-repeat -235px -10px;
}

ul li a#map02:hover span.offset, ul li a#map02:focus span.offset, ul li a#map02:active span.offset {
margin-top:-11px;
margin-left:125px;
}

ul li a#map03 {
width:75px;
height:95px;
margin-top:3px;
margin-left:115px;
}

ul li a#map03:hover, ul li a#map03:focus, ul li a#map03:active {
background:transparent url(/articleimg/2007/03/4514/map_flat_on.jpg) no-repeat -115px -88px;
}

ul li a#map03:hover span.offset, ul li a#map03:focus span.offset,ul li a#map03:active span.offset {
margin-top:-89px;
margin-left:245px;
}

ul li a#map04 {
width:110px;
height:120px;
margin-top:-60px;
margin-left:5px;
}

ul li a#map04:hover, ul li a#map04:focus, ul li a#map04:active {
background:transparent url(/articleimg/2007/03/4514/map_flat_on.jpg) no-repeat -5px -123px;
}

ul li a#map04:hover span.offset, ul li a#map04:focus span.offset, ul li a#map04:active span.offset {
margin-top:-124px;
margin-left:355px;
}

ul li a#map05 {
width:95px;
height:97px;
margin-top:-90px;
margin-left:240px;
}

ul li a#map05:hover, ul li a#map05:focus, ul li a#map05:active {
background:transparent url(/articleimg/2007/03/4514/map_flat_on.jpg) no-repeat -240px -153px;
}

ul li a#map05:hover span.offset, ul li a#map05:focus span.offset, ul li a#map05:active span.offset {
margin-top:-154px;
margin-left:120px;
}
</style>
</head>
<body>
<ul>
 <li><a id="map01" href="#map01"><img src="/articleimg/2007/03/4514/map1.jpg" alt="Post Office" />This is the Popsville community Post Office, your home of over-priced postage. Click map for more</a></li>
 <li><a id="map02" href="#map02"><img src="/articleimg/2007/03/4514/map2.jpg" alt="Dew Drop Inn" />Home is where the beer is. And that means the Dew Drop Inn. Live music on the weekends. Click map for more</a></li>
 <li><a id="map03" href="#map03"><img src="/articleimg/2007/03/4514/map3.jpg" alt="River Beach" />Spend lazy summer afternoons at the beautiful River Beach. Hang out on the nude beach. Click map for more</a></li>

<li><a id="map04" href="#map04"><img src="/articleimg/2007/03/4514/map4.jpg" alt="Woodland Traders" />Our local Woodland Traders is a veritable Mecca of consumer goods and hardware. Click map for more</a></li>
 <li><a id="map05" href="#map05"><img src="/articleimg/2007/03/4514/map5.jpg" alt="Wild Game Diner" />Country living means road kill, and the Wild Game Diner prepares it with special sauce. Click map for more</a></li>
 </ul>
</body>
</html>

这个实例，基本上是应用hover来实现隐藏/显示效果。

实例初始部分内容被隐藏，当hover时让其隐藏的内容显示。对于初始的隐藏我们可以通过，对父元素设置相对位置（position : relative;），对其要隐藏的子元素设置绝对位置（position : absolute;），然后对要隐藏的子元素设置margin属性，并给于无限大负值让其移动无限远隐藏，而当hover触发时，通过对隐藏的子元素重新设置margin值让其显示。对于图片中变化的部分我们可以通过hover时背景图的变化来实现。

首先我们要准备好分析用的图片，如下总共7张，或许有人要问，为什么背景触发的图片使用一张，而不使用5张。其实部分原因大家应该可以看出，就是以后维护的方便，修改一张图总比修改5张图片来的方便，其次使用5张图浏览器需要加载5次，而使用1张图浏览器只需要加载一次就行了。那或许有朋友要问了，那我把2张背景图放在一张上可以吗？按照你上面的理论，不是更方便吗？是的，放一张上从逻辑上是可以的，但有时候还要考虑到图片的大小和图片加载的速度。