英文教程:用CSS控制和操作BODY标记

作者佚名技术来源 CSS技术浏览发布时间 2012-03-01

hat’ll do the trick, but what about when we move to the Field Tips page? We will have to remove the active class from the forums tab and apply it to the the Field Tips tab. That’s not very convenient. That means the code for the navigation block is unique on every single page of the site. So let’s say down the road we want to add a Contact tab, we’ll have to alter the code on every single page. No fun.

Let’s do this a little smarter. First we don’t want to include the navigation block of code on every page, we want to include it, probably with a simple PHP include like this:

<?php include_once("nav.html"); ?>

But then how do we apply the “active” class to the current navigation list element?

This is where apply what we just learned about giving unique ID’s to the body! Instead of applying a class to only the active list element, let’s apply a unique class to each separate list item as well as give our body an unique ID.

   ...
</head>

<body id="field-tips">
   ...
   <li class="fieldtips"><a href="/fieldtips">Field tips</a></li>
   <li class="forums"><a href="/forums">Forums</a></li>
   ...

Now we can target specific elements in the navigation with some clever CSS:

#field-tips li.fieldtips, #forums li.forums {
   background-position: bottom;
}

This means that the code for the navigation block can stay the same on every page, yet only the navigation element native to that page will be affected by this CSS and “flip” to the active state.

Let’s get even more dynamic

Reader Brian left an awesome comment on how you can use PHP to apply the unique ID to to the body element:

<body id="<?= basename(Let’s say you want to change the color of your links on just your contact page to red. They are blue on every other page, but it just makes sense

凌众科技专业提供服务器租用、服务器托管、企业邮局、虚拟主机等服务，公司网站：http://www.lingzhong.cn 为了给广大客户了解更多的技术信息，本技术文章收集来源于网络,凌众科技尊重文章作者的版权，如果有涉及你的版权有必要删除你的文章，请和我们联系。以上信息与文章正文是不可分割的一部分,如果您要转载本文章,请保留以上信息，谢谢!

分享到：更多

你可能对下面的文章感兴趣

上一篇: 如何对CSS Expression进行优化下一篇: ie6和ie7下链接图片点不中问题讨论

关于英文教程:用CSS控制和操作BODY标记的所有评论

随机推荐