Adds classes to body element when viewing CiviCRM in WordPress admin.

civicrm-admin-body-classes.php

<?php

add_filter( 'admin_body_class', 'my_admin_body_classes' );

/**
 * Adds classes to body element when viewing CiviCRM in WordPress admin.
 *
 * This allows selectors to be written for CiviCRM admin pages.
 *
 * @param str $classes The existing admin body classes.
 * @return str $classes The modified admin body classes.
 */
function my_admin_body_classes( $classes ) {

	// bail if no CiviCRM
	if ( ! function_exists( 'civi_wp' ) ) {
		return $classes;
	}

	// base our classes on the current request args
	$args = civi_wp()->get_request_args();

	// bail if we don't have any
	if ( is_null( $args['argString'] ) ) {
		return $classes;
	}

	// init CiviCRM classes
	$civicrm_classes = array();

	// check for top level - it can be assumed this always 'civicrm'
	if ( isset( $args['args'][0] ) AND ! empty( $args['args'][0] ) ) {
		$civicrm_classes[] = $args['args'][0];
	}

	// check for second level - the component
	if ( isset( $args['args'][1] ) AND ! empty( $args['args'][1] ) ) {
		$civicrm_classes[] = $args['args'][0] . '-' . $args['args'][1];
	}

	// check for third level - the component's configuration
	if ( isset( $args['args'][2] ) AND ! empty( $args['args'][2] ) ) {
		$civicrm_classes[] = $args['args'][0] . '-' . $args['args'][1] . '-' . $args['args'][2];
	}

	// check for fourth level - because well, why not?
	if ( isset( $args['args'][3] ) AND ! empty( $args['args'][3] ) ) {
		$civicrm_classes[] = $args['args'][0] . '-' . $args['args'][1] . '-' . $args['args'][2] . '-' . $args['args'][3];
	}
	
	// add to admin body classes
	$classes .= ' ' . implode( ' ', $civicrm_classes );
	
	// --<
	return $classes;

}