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

o 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:

___FCKpd___6

This will return the name of the PHP file being executed as the ID (e.g. body id=”index.php”). To leave off the .php part, just remove the “.php” part.

SERVER[''PHP_SELF''], ".php")?>">

This will return the name of the PHP file being executed as the ID (e.g. body id=”index.p

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