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Function Reference/body class

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Description

Themes have a template tag for the body tag which will help theme authors to style more effectively with CSS. The Template Tag is called body_class. This function gives the body element different classes and can be added, typically, in the header.php's HTML body tag.

Usage

<body <?php body_class($class); ?>>

Parameters

How to pass parameters to tags with PHP function-style parameters

class

(string or array) (optional) One or more classes to add to the class attribute, separated by a single space.

Default: null

Default Values

The body_class CSS classes appear based upon the pageview Conditional Tags as follows.

Front Page

Site front page: home

If the site front page displays the blog posts index: home blog.
If the site front page displays a static page: home page.

Blog Posts Index

Blog posts index: blog

If the blog posts index is displayed on the site front page: home blog
If the blog posts index is displayed on a static page: page blog

Single Post

Single post pages: single postid-{ID}

Single blog post page: single-post
Single custom post type page: single-{posttype}
Post Formats (if supported):
- Post format assigned: single-format-{format}
- No post format assigned: single-format-standard
Single attachment pages: attachment single-attachment attachmentid-{ID} attachment-mime-type

Page

Static page: page page-id-{ID}

Page Hierarchy
- Parent page: page-parent
- Child page: page-child parent-pageid-{ID}
Page Templates
- Page template: page-template page-template-{directory}{filename}_php if custom page template is assigned, or page-template-default if no custom page template is assigned.

Search

Search results page: search

Results: search-results
No results: search-no-results

Paged/Multiple Pages

Multi-page index pages and paginated posts: paged. Multi-page index pages and paginated posts with more than 2 pages paged paged-n.

Single Blog Post: single-paged-n
Static Page: page-paged-n
Category archive index: category-paged-n
Tag archive index: tag-paged-n
Date archive index: date-paged-n
Author archive index: author-paged-n
Search results index: search-paged-n
Custom Post Type archive index: post-type-paged-n

404 Page Error

Error 404 page: error404

Logged-in

If the current user is logged in: logged-in

Text Direction

If text direction is set to "right-to-left": rtl

Custom Background

If using Custom Background to display the site background image or color the class selectors: custom-background

Admin Toolbar

If the admin toolbar is displayed: admin-bar no-customize-support

Examples

Implementation

The following example shows how to implement the body_class template tag into a theme.

<body <?php body_class(); ?>>

The actual HTML output might resemble something like this (the About the Tests page from the Theme Unit Test):

<body class="page page-id-2 page-parent page-template-default logged-in">

In the WordPress Theme stylesheet, add the appropriate styles, such as:

.page {
	    /* styles for all posts within the page class */
}
.page-id-2 {
	    /* styles for only page ID number 2 */
}
.logged-in {
	    /* styles for all pageviews when the user is logged in */
}

Adding More Classes

By default, the only classes will be those described above.

To add more classes, the template tag's parameter can be added. For example, to add a unique class to the same template used above:

<body <?php body_class('class-name'); ?>>

The results would be:

<body class="page page-id-2 page-parent page-template-default logged-in class-name">

Add Classes By Filters

You can add additional body classes by filtering the body_class function.

To add the following to the WordPress Theme functions.php file, changing my_class_names and class-name to meet your needs:

// Add specific CSS class by filter
add_filter('body_class','my_class_names');
function my_class_names($classes) {
	// add 'class-name' to the $classes array
	$classes[] = 'class-name';
	// return the $classes array
	return $classes;
}

To add a category class to single post pageviews and template files, add the following to the functions.php.

// add category nicenames in body and post class
function category_id_class($classes) {
	global $post;
	foreach((get_the_category($post->ID)) as $category)
		$classes[] = $category->category_nicename;
	return $classes;
}
add_filter('post_class', 'category_id_class');
add_filter('body_class', 'category_id_class');

Add Sidebar Classes

You can add additional body classes by filtering the body_class function, but what if you want to add a class only when the sidebar.php file is being shown? Here's a working example you can post in your themes functions.php file to add a sidebar class to the output of body_class. From: Add CSS Class to body when Sidebar is Present

add_action('wp_head', create_function("",'ob_start();') );
add_action('get_sidebar', 'my_sidebar_class');
add_action('wp_footer', 'my_sidebar_class_replace');
 
function my_sidebar_class($name=''){
  static $class="withsidebar";
  if(!empty($name))$class.=" sidebar-{$name}";
  my_sidebar_class_replace($class);
}
 
function my_sidebar_class_replace($c=''){
  static $class='';
  if(!empty($c)) $class=$c;
  else {
    echo str_replace('<body class="','<body class="'.$class.' ',ob_get_clean());
    ob_start();
  }
}

Changelog

Since: 2.8

Source Code

body_class() is located in wp-includes/post-template.php.

body_class(), next_image_link(), next_post_link(), next_posts_link(), post_class(), post_password_required(), posts_nav_link(), previous_image_link(), previous_post_link(), previous_posts_link(), single_post_title, sticky_class(), the_category(), the_category_rss(), the_content(), the_content_rss(), the_excerpt(), the_excerpt_rss(), the_ID(), the_meta(), the_shortlink(), the_tags(), the_title(), the_title_attribute(), the_title_rss(), wp_link_pages()

Hooks

Filter Hook: 'body_class'

See also index of Function Reference and index of Template Tags.