page_specific_class.module in Page Specific Class 8

This file adds a class to the body tag page-wise.

File

page_specific_class.module

<?php

/**
 * @file
 * This file adds a class to the body tag page-wise.
 */
use Drupal\Core\Url;
use Drupal\Component\Utility\Html;
use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_preprocess_html().
 */
function page_specific_class_preprocess_html(&$variables) {

  // Get current path.
  $current_path = \Drupal::service('path.current')
    ->getPath();

  // Get path from alias.
  $current_path = \Drupal::service('path.alias_manager')
    ->getPathByAlias($current_path);

  // Get settings from page specific class settings.
  $config = \Drupal::config('page_specific_class.settings');
  $enteredArr = explode(PHP_EOL, $config
    ->get('url_with_class'));
  foreach ($enteredArr as $values) {
    $urlWithClassArr = explode("|", $values);
    $url = trim(strtolower($urlWithClassArr[0]));
    if (isset($urlWithClassArr[1])) {
      $class = trim($urlWithClassArr[1]);
      $classes_array = explode(' ', $class);
      $front_page = \Drupal::service('path.matcher')
        ->isFrontPage();
      $enteredPath = \Drupal::service('path.alias_manager')
        ->getPathByAlias(Html::escape($url));

      // If current path and entered path by user in page class setting match,
      // then only add respective class.
      if ($current_path == $enteredPath) {
        foreach ($classes_array as $class) {
          $variables['attributes']['class'][] = Html::cleanCssIdentifier($class, []);
        }
      }
      elseif ($front_page && $enteredPath == "/<front>" || $enteredPath == "/*") {
        foreach ($classes_array as $class) {
          $variables['attributes']['class'][] = Html::cleanCssIdentifier($class, []);
        }
      }
    }
  }
}

/**
 * Implements hook_help().
 */
function page_specific_class_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.page_specific_class':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t("Page Specific Class allows users to add classes to body of any page through the configuration interface. Hooray for more powerful page theming!") . '</p>';
      $output .= '<h3>' . t('Usage') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('To add a class to a body tag of page, simply visit that  configuration page at <a href=":configure_link">Configure</a>.', [
        ':configure_link' => Url::fromRoute('page_specific_class.settings')
          ->toString(),
      ]) . '</dt>';
      $output .= '</dl>';
      return $output;
  }
}

Functions

Name	Description
page_specific_class_help	Implements hook_help().
page_specific_class_preprocess_html	Implements hook_preprocess_html().