当前位置: 首页 > 图文教程 > 网页制作 > CSS样式表 > css 背景图片定位在菜单效果中的应用实例

CSS样式表
base href 使用方法详解
html label标签的使用教程
使用CSS不用程序实现文字自动截断 用省略号代替
CSS hack实现 CSS完美兼容IE6/IE7/FF的通用方法
网页布局+纯CSS纵向下拉菜单 IE6/IE7兼容
CSS图片拼合生成器只需上传zip包即可
用iframe margin实现调用其他网页的某一区域的方法
用css alpha 滤镜 实现input file 样式美化代码
RGB 加成色 说明
为了防止乱码,请将用于页面编码的meta charset放到title的前面
DIV+CSS布局中不推荐使用的标签集合Dont Use These Tags
大家看了就明白了css样式中类class与标识id选择符的区别小结
DL.DT.DD实现左右的布局简单例子
css布局网页水平居中常用方法
使用CSS框架布局的缺点和优点小结
Web2.0下XHTML+CSS 设计需要注意的地方小结
table高级应用把表格进行到底(必看)
css强制换行 css强制不换行的css方法
Div CSS absolute与relative的区别小结
css实现文字垂直居中的代码

CSS样式表 中的 css 背景图片定位在菜单效果中的应用实例


出处:互联网   整理: 软晨网(RuanChen.com)   发布: 2010-01-10   浏览: 147 ::
收藏到网摘: n/a

这款菜单大家需要注意HOVER状态下背景图片定位发生了变化,从而实现了这样的效果。

本实例是一位国外的朋友所写,不进行任何翻译,直接发出来,大家可以偿试阅读,如果遇到困难可以求助于翻译软件。
不断的提高自己的英文阅读能力也是我们一直所提倡的,让我们一起努力吧!

Overview
  Here are the required graphics to assembe the menu


1. Main background
  Open the Photoshop file. Turn off the menu text Layer Group and save the main background as menu-bg.jpg.


2. Button graphics
  Turn off the background Layer Group and leave only the menu text layers visible. Make a rectangle selection cover the "home" item, go to menu Edit > Copy Merged (Cmd + Shift + C).


  Create a new file and take note of the file dimension (w x h), in my case the "home" graphic is 144 x 58px. Paste the "home" graphic in the new file. Go to menu Image > Canvas Size, adjust the image height x 2 (58 + 58 = 116px). Duplicate the home graphic layer and align it to the bottom. Erase the highlight strokes in the upper layer.


  Here is how the hover effect will work. We will set the link button to 144 x 58px, when mouseover, we will shift the background image from top to bottom.


  Repeat this step for the other buttons. You should have the follow graphics:


3. HTML source
  When you are done with the graphics, let’s start coding. Start with an un-ordered list <ul>.
  ● note there is an id="menu" assigned to the<ul> tag
  ● an unique class name assigned to each link <a>
  ● an empty <span> tag (the purpose of this is to make the mouseover effect)

div css xhtml xml Example Source Code Example Source Code [www.52css.com]
<ul id="menu">
   <li><a href="#" class="home">Home <span></span></a></li>
   <li><a href="#" class="about">About <span></span></a></li>
   <li><a href="#" class="rss">RSS <span></span></a></li>
</ul>

#menu
  Reset the menu to no padding, no margin, and no list-style. Specify the width and height same dimension as the menu-bg.jpg. Then attach the menu background image. The key point to remember here is set the position property to relative.

 Example Source Code [www.52css.com]
#menu {
   list-style: none;
   padding: 0;
   margin: 0;
   width: 774px;
   height: 210px;
   background: url(images/menu-bg.jpg) no-repeat;
   position: relative;
}

#menu span
  Specify the span element to display:none (so they will be invisible by default). Specify position:absolute, so we can place the mouseover GIF image on exact position.

 Example Source Code [www.52css.com]
#menu span {
   display: none;
   position: absolute;
}

#menu a
  The key point here is the text-indent property. We specify the text-indent property with a negative value (-900%), so the text will be hidden.

 Example Source Code [www.52css.com]
#menu a {
   display: block;
   text-indent: -900%;
   position: absolute;
   outline: none;
}

#menu a:hover
  When mouseover the link, we want to shift the background image from top to bottom.

 Example Source Code [www.52css.com]
#menu a:hover {
   background-position: left bottom;
}

#menu a:hover span
  When mouseover the link, we want the span element to display:block.

 Example Source Code [www.52css.com]
#menu a:hover span {
   display: block;
}

#menu .home
  Specify the width, height, and background image. Since we already specified all <a> element postition:absolute in previous step, now just say where the .home button should be by specifying the left and top property.

 Example Source Code [www.52css.com]
#menu .home {
   width: 144px;
   height: 58px;
   background: url(images/home.gif) no-repeat;
   left: 96px;
   top: 73px;
}

#menu .home span
  Here we are specifying the width, height, background, and position of the span element of .home (mouseover GIF image)

 Example Source Code [www.52css.com]
#menu .home span {
   width: 86px;
   height: 14px;
   background: url(images/home-over.gif) no-repeat;
   left: 28px;
   top: -20px;
}

#menu .about
  Copy the .home rules and rename them to .about. Now just change the width, height, background, left, and top property.

 Example Source Code [www.52css.com]
#menu .about {
   width: 131px;
   height: 51px;
   background: url(images/about.gif) no-repeat;
   left: 338px;
   top: 97px;
}
#menu .about span {
   width: 40px;
   height: 12px;
   background: url(images/about-over.gif) no-repeat;
   left: 44px;
   top: 54px;
}

#menu .rss
  Repeat this step for .rss

 Example Source Code [www.52css.com]
#menu .rss {
   width: 112px;
   height: 47px;
   background: url(images/rss.gif) no-repeat;
   left: 588px;
   top: 94px;
}
#menu .rss span {
   width: 92px;
   height: 20px;
   background: url(images/rss-over.gif) no-repeat;
   left: 26px;
   top: -20px;
}

All in one:

 Example Source Code [www.52css.com]
#menu {
   list-style: none;
   padding: 0;
   margin: 0;
   width: 774px;
   height: 210px;
   background: url(images/menu-bg.jpg) no-repeat;
   position: relative;
}
#menu span {
   display: none;
   position: absolute;
}
#menu a {
   display: block;
   text-indent: -900%;
   position: absolute;
   outline: none;
}
#menu a:hover {
   background-position: left bottom;
}
#menu a:hover span {
   display: block;
}

#menu .home {
   width: 144px;
   height: 58px;
   background: url(images/home.gif) no-repeat;
   left: 96px;
   top: 73px;
}
#menu .home span {
   width: 86px;
   height: 14px;
   background: url(images/home-over.gif) no-repeat;
   left: 28px;
   top: -20px;
}

#menu .about {
   width: 131px;
   height: 51px;
   background: url(images/about.gif) no-repeat;
   left: 338px;
   top: 97px;
}
#menu .about span {
   width: 40px;
   height: 12px;
   background: url(images/about-over.gif) no-repeat;
   left: 44px;
   top: 54px;
}
#menu .rss {
   width: 112px;
   height: 47px;
   background: url(images/rss.gif) no-repeat;
   left: 588px;
   top: 94px;
}
#menu .rss span {
   width: 92px;
   height: 20px;
   background: url(images/rss-over.gif) no-repeat;
   left: 26px;
   top: -20px;
}