apply_filters( 'admin_body_class', string $classes )

Filters the CSS classes for the body tag in the admin.

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Description

This filter differs from the ‘post_class’ and ‘body_class’ filters in two important ways:

  1. $classes is a space-separated string of class names instead of an array.
  2. Not all core admin classes are filterable, notably: wp-admin, wp-core-ui, and no-js cannot be removed.

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Parameters

$classes string
Space-separated list of CSS classes.

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Source

File: wp-admin/admin-header.php. View all references 

$admin_body_classes = apply_filters( 'admin_body_class', '' );

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Changelog

Changelog
Version Description
2.3.0 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 2You must log in to vote on the helpfulness of this note
    Contributed by Philipp Stracker —

    When adding new classes to the body, you should make sure to add spaces before and after your class name. This prevents accidental concatenation of two plugins class-names.

    Example:

    function admin_body_class( $classes ) {
    // Wrong: No space in the beginning/end.
    $classes .= 'my-class1 my-class2';

    // Right: Add a leading space and a trailing space.
    $classes .= ' my-class1 my-class2 ';

    return $classes;
}
  2. Skip to note 2 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 1You must log in to vote on the helpfulness of this note
    Contributed by thejaydip —

    If the current page is a post/page in edit mode

    function wpdocs_admin_classes( $classes ) {
	global $pagenow;

	if ( in_array( $pagenow, array( 'post.php', 'post-new.php' ), true ) ) {
		$classes .= ' your-class';
	}

	return $classes;
}

add_filter( 'admin_body_class', 'wpdocs_admin_classes' );

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