2. load library admin css, js (ok)

  1. Load file js

wp-content/plugins/lionel-setup-content/includes/class-lionel_content.php

<?php
  class Lionel_Content
  {
    protected $loader;
    protected $plugin_name;
    protected $version;
    private $plugin_admin;
    private $buffer_service;
    public function __construct ()
    {
      if ( defined( 'LIONEL_CONTENT_PLUGIN_VERSION' ) ) {
        $this->version = LIONEL_CONTENT_PLUGIN_VERSION;
      } else {
        $this->version = '1.0.0';
      }
      $this->plugin_name = 'lionel_content';
      $this->load_dependencies ();
      $this->define_admin_hooks();
    }
    private function load_dependencies ()
    {
      require_once plugin_dir_path (dirname (__FILE__))
        . 'includes/class-lionel_content-loader.php';
      $this->loader = new Lionel_Content_Loader();
      /**
       * Part 3
       */
      require_once plugin_dir_path( dirname( __FILE__ ) ) . 'admin/class-lionel_content-admin.php';
    }
    public function get_loader() {
      return $this->loader;
    }
    public function get_plugin_name() {
      return $this->plugin_name;
    }
    public function get_version() {
      return $this->version;
    }
    public static $instance;
    public static function get_instance() {
      if ( ! isset( self::$instance ) && ! ( self::$instance instanceof self ) ) {
        self::$instance = new self;
      }
      return self::$instance;
    }
    public function install() {
      $this->add_lionel_content_defaults();
    }
    public function add_lionel_content_defaults ()
    {
      global $wpdb;
      $options = get_option ('lionel_options');
      if ( !isset($options['lionel_installed']) || $options['lionel_installed'] != 1 || !is_array($options) )
      {
        $opt = array(
          'lionel_version' => LIONEL_CONTENT_PLUGIN_VERSION,
          'lionel_db_version' => LIONEL_CONTENT_DB_VERSION,
          'lionel_installed' => 1,
          'premium' => 0
        );
        if ( is_multisite() )
        {
          update_site_option( 'lionel_options', $opt );
        } else {
          $this->lionel_content_update_option( 'lionel_options', $opt );
        }
      }
      $this->lionel_content_db_install();
    }
    public function lionel_content_update_option( $option_name, $new_value ) {
      if ( get_option( $option_name ) !== false ) {
        // The option already exists, so we just update it.
        update_option( $option_name, $new_value );
      } else {
        // The option hasn't been added yet. We'll add it with $autoload set to 'no'.
        add_option( $option_name, $new_value, $deprecated=null, $autoload='no' );
      }
    }
    public function lionel_content_db_install ()
    {
      global $wpdb;
      $charset_collate = $wpdb->get_charset_collate ();
      $this->lionel_content_set_wpdb_tables ();
      require_once (ABSPATH . 'wp-admin/includes/upgrade.php');
      $sql = "CREATE TABLE IF NOT EXISTS $wpdb->lionel_content_logs (
        `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
        `post_id` int(11) NOT NULL,
        `action` enum('publish','update','repost','bulk_publish', 'share', 'add_queue') DEFAULT NULL,
        `request_sent` datetime NOT NULL,
        `profile_id` varchar(191) NOT NULL,
        `profile_name` varchar(191) NOT NULL DEFAULT '',
        `result` enum('success','test','pending','warning','error') NOT NULL DEFAULT 'success',
        `result_message` text,
        `status_text` text,
        `status_image` text,
        `status_link` text,
        `status_created_at` datetime DEFAULT NULL,
        `status_due_at` datetime DEFAULT NULL,
        `lionel_posting_schedule` text,
        PRIMARY KEY (`id`),
        KEY `post_id` (`post_id`),
        KEY `action` (`action`),
        KEY `result` (`result`),
        KEY `profile_id` (`profile_id`)
      ) {$charset_collate};";
      dbDelta ($sql);
      $sqlCate = "CREATE TABLE IF NOT EXISTS $wpdb->lionel_categories (
        `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
        `name` varchar(191) NOT NULL DEFAULT '',
        `description` text,
        `random_availability` int(1) NOT NULL DEFAULT 1,
        `status` int(1) NOT NULL DEFAULT 1,
        `is_default` int(1) DEFAULT NULL,
        `created_at` datetime DEFAULT NULL,
        `updated_at` datetime DEFAULT NULL,
        PRIMARY KEY (`id`)
      ) {$charset_collate};";
      dbDelta ($sqlCate);
      // Check categories
      $categories = $wpdb->get_results("SELECT * FROM {$wpdb->lionel_categories}");
      if(empty((array)$categories)) {
        // add default Category
        $dateNow = date('Y-m-d H:i:s');
        $insertSql = "INSERT INTO {$wpdb->prefix}lionel_categories (name, description, random_availability, status, is_default, created_at, updated_at) VALUES ('Your evergreen content', 'Use this category to promote your own content - share any blog posts or pages you publish.', 1, 1, 1, '$dateNow', null), ('Promotional', 'Use this category to promote your services/products. Make sure to include Calls To Actions (CTAs) like \"Book a call with us\" or \"start a trial account\".', 1, 1, 0, '$dateNow', null), ('Quotes, Questions, and Fun', 'Use this category to generate engagement on your socials. Share inspirational or fun quotes, from your niche or create open questions for your audience.', 1, 1, 0, '$dateNow', null)";
        dbDelta($insertSql);
      }
    }
    public function lionel_content_set_wpdb_tables()
    {
      global $wpdb;
      $wpdb->lionel_content_logs = $wpdb->prefix . 'lionel_content_logs';
      $wpdb->lionel_categories = $wpdb->prefix . 'lionel_categories';
    }
    public function run ()
    {
      $this->loader->run();
    }
    /**
     * Part 4
     */
    private function define_admin_hooks ()
    {
      $plugin_admin = new Lionel_Content_Admin($this->get_plugin_name (),
        $this->get_version ());
      $this->plugin_admin = $plugin_admin;
      $this->loader->add_action( 'admin_enqueue_scripts', $plugin_admin, 'enqueue_scripts' );
    }
  }

wp-content/plugins/lionel-setup-content/admin/class-lionel_content-admin.php

<?php
  class Lionel_Content_Admin
  {
    private $plugin_name;
    private $version;
    private $plugin_public_name;
    private $service;
    private $client_id;
    private $settings;
    private $buffer_service;
    public function __construct ($plugin_name, $version)
    {
      $this->plugin_name = $plugin_name;
      $this->version = $version;
      $this->plugin_public_name = 'Lionel Content';
      $this->service = 'Buffer';
    }
    public function enqueue_scripts ()
    {
      if (LIONEL_CONTENT_ENABLE_DEBUG == true) :
        wp_enqueue_script($this->plugin_name, plugin_dir_url(__FILE__) . 'js/lionel_content-admin.js', array('jquery'), time(), false);
        // set variables for script
        wp_localize_script($this->plugin_name, 'ajaxSettings', array('ajaxurl' => admin_url('admin-ajax.php')));
      else :
        wp_enqueue_script($this->plugin_name, plugin_dir_url(__FILE__) . 'js/lionel_content-admin.js', array('jquery'), $this->version, false);
        // set variables for script
        wp_localize_script($this->plugin_name, 'ajaxSettings', array('ajaxurl' => admin_url('admin-ajax.php')));
      endif;
    }
  }

Thành qủa là đây :)

Full code

2. Load file css

wp-content/plugins/lionel-setup-content/admin/class-lionel_content-admin.php

<?php
  class Lionel_Content_Admin
  {
    private $plugin_name;
    private $version;
    private $plugin_public_name;
    private $service;
    private $client_id;
    private $settings;
    private $buffer_service;
    public function __construct ($plugin_name, $version)
    {
      $this->plugin_name = $plugin_name;
      $this->version = $version;
      $this->plugin_public_name = 'Lionel Content';
      $this->service = 'Buffer';
      $this->load_dependencies();
    }
    public function enqueue_styles ()
    {
      if (LIONEL_CONTENT_ENABLE_DEBUG == true) :
        wp_enqueue_style($this->plugin_name, plugin_dir_url(__FILE__) . 'css/lionel_content-admin.css', array(), time(), 'all');
      else :
        wp_enqueue_style($this->plugin_name, plugin_dir_url(__FILE__) . 'css/lionel_content-admin.css', array(), $this->version, 'all');
      endif;
    }
    public function enqueue_scripts ()
    {
      if (LIONEL_CONTENT_ENABLE_DEBUG == true) :
        wp_enqueue_script($this->plugin_name, plugin_dir_url(__FILE__) . 'js/lionel_content-admin.js', array('jquery'), time(), false);
        // set variables for script
        wp_localize_script($this->plugin_name, 'ajaxSettings', array('ajaxurl' => admin_url('admin-ajax.php')));
      else :
        wp_enqueue_script($this->plugin_name, plugin_dir_url(__FILE__) . 'js/lionel_content-admin.js', array('jquery'), $this->version, false);
        // set variables for script
        wp_localize_script($this->plugin_name, 'ajaxSettings', array('ajaxurl' => admin_url('admin-ajax.php')));
      endif;
    }
    public function load_dependencies ()
    {
      require_once plugin_dir_path(dirname(__FILE__)) . 'admin/class-lionel_content-settings.php';
    }
  }

wp-content/plugins/lionel-setup-content/admin/css/lionel_content-admin.scss

body {
    color: red !important;
}

wp-content/plugins/lionel-setup-content/includes/class-lionel_content.php

<?php
  class Lionel_Content
  {
    protected $loader;
    protected $plugin_name;
    protected $version;
    private $plugin_admin;
    private $buffer_service;
    public function __construct ()
    {
      if ( defined( 'LIONEL_CONTENT_PLUGIN_VERSION' ) ) {
        $this->version = LIONEL_CONTENT_PLUGIN_VERSION;
      } else {
        $this->version = '1.0.0';
      }
      $this->plugin_name = 'lionel_content';
      $this->load_dependencies ();
      $this->define_admin_hooks();
    }
    private function load_dependencies ()
    {
      require_once plugin_dir_path (dirname (__FILE__))
        . 'includes/class-lionel_content-loader.php';
      $this->loader = new Lionel_Content_Loader();
      /**
       * Part 3
       */
      require_once plugin_dir_path( dirname( __FILE__ ) ) . 'admin/class-lionel_content-admin.php';
    }
    public function get_loader() {
      return $this->loader;
    }
    public function get_plugin_name() {
      return $this->plugin_name;
    }
    public function get_version() {
      return $this->version;
    }
    public static $instance;
    public static function get_instance() {
      if ( ! isset( self::$instance ) && ! ( self::$instance instanceof self ) ) {
        self::$instance = new self;
      }
      return self::$instance;
    }
    public function install() {
      $this->add_lionel_content_defaults();
    }
    public function add_lionel_content_defaults ()
    {
      global $wpdb;
      $options = get_option ('lionel_options');
      if ( !isset($options['lionel_installed']) || $options['lionel_installed'] != 1 || !is_array($options) )
      {
        $opt = array(
          'lionel_version' => LIONEL_CONTENT_PLUGIN_VERSION,
          'lionel_db_version' => LIONEL_CONTENT_DB_VERSION,
          'lionel_installed' => 1,
          'premium' => 0
        );
        if ( is_multisite() )
        {
          update_site_option( 'lionel_options', $opt );
        } else {
          $this->lionel_content_update_option( 'lionel_options', $opt );
        }
      }
      $this->lionel_content_db_install();
    }
    public function lionel_content_update_option( $option_name, $new_value ) {
      if ( get_option( $option_name ) !== false ) {
        // The option already exists, so we just update it.
        update_option( $option_name, $new_value );
      } else {
        // The option hasn't been added yet. We'll add it with $autoload set to 'no'.
        add_option( $option_name, $new_value, $deprecated=null, $autoload='no' );
      }
    }
    public function lionel_content_db_install ()
    {
      global $wpdb;
      $charset_collate = $wpdb->get_charset_collate ();
      $this->lionel_content_set_wpdb_tables ();
      require_once (ABSPATH . 'wp-admin/includes/upgrade.php');
      $sql = "CREATE TABLE IF NOT EXISTS $wpdb->lionel_content_logs (
        `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
        `post_id` int(11) NOT NULL,
        `action` enum('publish','update','repost','bulk_publish', 'share', 'add_queue') DEFAULT NULL,
        `request_sent` datetime NOT NULL,
        `profile_id` varchar(191) NOT NULL,
        `profile_name` varchar(191) NOT NULL DEFAULT '',
        `result` enum('success','test','pending','warning','error') NOT NULL DEFAULT 'success',
        `result_message` text,
        `status_text` text,
        `status_image` text,
        `status_link` text,
        `status_created_at` datetime DEFAULT NULL,
        `status_due_at` datetime DEFAULT NULL,
        `lionel_posting_schedule` text,
        PRIMARY KEY (`id`),
        KEY `post_id` (`post_id`),
        KEY `action` (`action`),
        KEY `result` (`result`),
        KEY `profile_id` (`profile_id`)
      ) {$charset_collate};";
      dbDelta ($sql);
      $sqlCate = "CREATE TABLE IF NOT EXISTS $wpdb->lionel_categories (
        `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
        `name` varchar(191) NOT NULL DEFAULT '',
        `description` text,
        `random_availability` int(1) NOT NULL DEFAULT 1,
        `status` int(1) NOT NULL DEFAULT 1,
        `is_default` int(1) DEFAULT NULL,
        `created_at` datetime DEFAULT NULL,
        `updated_at` datetime DEFAULT NULL,
        PRIMARY KEY (`id`)
      ) {$charset_collate};";
      dbDelta ($sqlCate);
      // Check categories
      $categories = $wpdb->get_results("SELECT * FROM {$wpdb->lionel_categories}");
      if(empty((array)$categories)) {
        // add default Category
        $dateNow = date('Y-m-d H:i:s');
        $insertSql = "INSERT INTO {$wpdb->prefix}lionel_categories (name, description, random_availability, status, is_default, created_at, updated_at) VALUES ('Your evergreen content', 'Use this category to promote your own content - share any blog posts or pages you publish.', 1, 1, 1, '$dateNow', null), ('Promotional', 'Use this category to promote your services/products. Make sure to include Calls To Actions (CTAs) like \"Book a call with us\" or \"start a trial account\".', 1, 1, 0, '$dateNow', null), ('Quotes, Questions, and Fun', 'Use this category to generate engagement on your socials. Share inspirational or fun quotes, from your niche or create open questions for your audience.', 1, 1, 0, '$dateNow', null)";
        dbDelta($insertSql);
      }
    }
    public function lionel_content_set_wpdb_tables()
    {
      global $wpdb;
      $wpdb->lionel_content_logs = $wpdb->prefix . 'lionel_content_logs';
      $wpdb->lionel_categories = $wpdb->prefix . 'lionel_categories';
    }
    public function run ()
    {
      $this->loader->run();
    }
    /**
     * Part 4
     */
    private function define_admin_hooks ()
    {
      $plugin_admin = new Lionel_Content_Admin($this->get_plugin_name (),
        $this->get_version ());
      $this->plugin_admin = $plugin_admin;
      $this->loader->add_action( 'admin_enqueue_scripts', $plugin_admin, 'enqueue_styles' );
      $this->loader->add_action( 'admin_enqueue_scripts', $plugin_admin, 'enqueue_scripts' );
    }
  }
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