283 lines
7.8 KiB
PHP
Executable File
283 lines
7.8 KiB
PHP
Executable File
<?php
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/**
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* The file that defines the core plugin class
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*
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* A class definition that includes attributes and functions used across both the
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* public-facing side of the site and the admin area.
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*
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* @link http://www.robbertdekuiper.com
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* @since 0.1.0
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*
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* @package Ajax_Filter_Posts
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*/
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/**
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* The core plugin class.
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*
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* The plugin logic lives here
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*
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* Also maintains the unique identifier of this plugin as well as the current
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* version of the plugin.
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*
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* @since 0.1.0
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* @package Ajax_Filter_Posts
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* @author Robbert de Kuiper <mail@robbertdekuiper.com>
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*/
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class Ajax_Filter_Posts {
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/**
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* The unique identifier of this plugin.
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*
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* @var string $plugin_name The string used to uniquely identify this plugin.
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*/
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protected $plugin_name;
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/**
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* The current version of the plugin.
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*
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* @var String $version The current version of the plugin.
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*/
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protected $version;
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/**
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* Define the core functionality of the plugin.
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*
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* Set the plugin name and the plugin version that can be used throughout the plugin.
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* Load the dependencies, define the locale, and set the hooks.
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*
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*/
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public function __construct() {
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$this->plugin_name = 'ajax-filter-posts';
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$this->version = '0.2.0';
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add_action( 'plugins_loaded', [$this, 'load_textdomain'] );
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add_action( 'wp_enqueue_scripts', [$this,'add_scripts'] );
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add_action('wp_ajax_process_filter_change', [$this, 'process_filter_change']);
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add_action('wp_ajax_nopriv_process_filter_change', [$this, 'process_filter_change']);
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add_shortcode( 'ajax_filter_posts', [$this, 'create_shortcode']);
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}
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/**
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* Set the plugins language domain
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*/
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public function load_textdomain() {
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load_muplugin_textdomain( 'ajax-filter-posts', basename( dirname( __FILE__ )) . '/languages' );
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}
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/**
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* Load the required assets for this plugin.
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*
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*/
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public function add_scripts() {
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$script_variables = [
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'nonce' => wp_create_nonce( 'filter-posts-nonce' ),
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'ajaxUrl' => admin_url( 'admin-ajax.php' ),
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'timeoutMessage' => __('It took to long the get the posts. Please reload the page and try again.', 'ajax-filter-posts'),
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'serverErrorMessage' => __('Got no response. Please reload the page and try again.', 'ajax-filter-posts'),
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];
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// IF WPML is installed add language variable to set variable later during the query
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// WPML can't figure out which language to query, when posts are loaded via AJAX.
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if (ICL_LANGUAGE_CODE) {
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$script_variables['language'] = ICL_LANGUAGE_CODE;
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}
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wp_enqueue_script( 'ajax-filter', plugins_url('/assets/js/ajax-filter-posts.js', __FILE__), [], '', true );
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wp_enqueue_style( 'ajax-filter', plugins_url('/assets/css/ajax-filter-posts.css', __FILE__), []);
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wp_localize_script( 'ajax-filter', 'filterPosts', $script_variables);
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}
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/**
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* Create shortcode
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*
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* @param Array $atts Array of given attributes
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* @return String HTML initial rendered by shortcode
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*/
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public function create_shortcode($atts) {
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$attributes = shortcode_atts( array(
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'post_type'=> 'post',
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'tax' => ['post_tag'],
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'posts_per_page' => 12, // How many posts per page,
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), $atts, $this->plugin_name );
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$filterlists = $this->get_filterlist($attributes['tax']);
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$query = new WP_Query([
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'post_type' => $attributes['post_type'],
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'posts_per_page' => $attributes['posts_per_page'],
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]);
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$plural_post_name = strtolower(get_post_type_object($query->query['post_type'])->labels->name);
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return include(plugin_dir_path( __FILE__ ) . 'templates/base.php');
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}
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/**
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* Get a list of filters and terms, based on the taxonomies set in the shortcode
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*
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* @param String $taxonomies Comma seperated list of taxonomies
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* @return Array List of taxonomies with terms
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*/
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protected function get_filterlist($taxonomies) {
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$filterlists = explode(',', $taxonomies);
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$filterlists = array_map('trim', $filterlists);
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$filterlists = array_filter($filterlists, 'taxonomy_exists');
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$filterlists = $this->get_termlist($filterlists);
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return $filterlists;
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}
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/**
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* Get a list of filters and terms
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*
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* @param string $taxonomies A single taxonomy
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* @return Array Taxonomy name and list of terms associated with the taxonomy
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*/
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protected function get_termlist($taxonomies) {
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$list = [];
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foreach ($taxonomies as $taxonomy) {
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$terms = get_terms($taxonomy);
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if (!empty($terms)) {
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$list[] = [
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'name' => get_taxonomy($taxonomy)->labels->singular_name,
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'filters' => $terms,
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];
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}
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}
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return $list;
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}
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/**
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* Send new posts query via AJax after filters are changed in the frontend
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*
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* @return String HTML string with parsed posts or an error message
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*/
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public function process_filter_change() {
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check_ajax_referer( 'filter-posts-nonce', 'nonce' );
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$post_type = sanitize_text_field($_POST['params']['postType']);
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$tax = $this->get_tax_query_vars($_POST['params']['tax']);
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$page = intval($_POST['params']['page']);
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$quantity = intval($_POST['params']['quantity']);
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$language = sanitize_text_field($_POST['params']['language']);
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$args = [
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'paged' => $page,
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'post_type' => $post_type,
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'posts_per_page' => $quantity,
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'tax_query' => $tax
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];
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$response = $this->get_filter_posts($args, $language);
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if ($response) {
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wp_send_json_success($response);
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} else {
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wp_send_json_error(__('Oops, something went wrong. Please reload the page and try again.', 'ajax-filter-posts'));
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}
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die();
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}
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/**
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* Converts the queried page number to a real page number
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*
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* @param Object $query WP Query
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* @return Integer Current page
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*/
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private function get_page_number($query){
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$query_page = $query->get( 'paged' );
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return $query_page == 0 ? 1 : $query_page;
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}
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/**
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* Check if the queried page is the last page of the query
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*
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* @param Object $query WP Query
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* @return Boolean true if is last page
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*/
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private function is_last_page($query) {
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return $this->get_page_number($query) >= $query->max_num_pages;
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}
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/**
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* Get the query paramaters based on set filters
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*
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* @param array $taxonomies list of taxanomies with terms
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* @return array taxonomies prepared for the WordPress Query
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*/
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protected function get_tax_query_vars($taxonomies) {
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$tax_query = [];
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foreach ($taxonomies as $taxonomy => $terms) {
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$taxonomy = sanitize_text_field($taxonomy);
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if (taxonomy_exists($taxonomy)) {
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$valid_terms = $this->get_valid_terms($terms, $taxonomy);
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if ($valid_terms) {
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$term_query = [
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'taxonomy' => $taxonomy,
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'field' => 'slug',
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'terms' => $valid_terms,
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];
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$tax_query[] = $term_query;
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}
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}
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}
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if( count($tax_query) > 1 ) {
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$tax_query[] = ['relation' => 'OR'];
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}
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return $tax_query;
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}
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/**
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* Check of the given thers are valid terms
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*
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* @param array $terms List of terms set by the filters
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* @param string $tax Taxomy associated with the terms
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* @return array List of valid terms
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*/
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protected function get_valid_terms($terms, $tax) {
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$valid_terms = [];
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foreach ($terms as $term) {
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$term = sanitize_text_field($term);
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if (term_exists($term,$tax)) {
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$valid_terms[] = $term;
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}
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}
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return $valid_terms;
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}
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/**
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* Set up a filters query and parse the template
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*
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* @param array $args Arguments for the WordPress Query
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* @return string HTMl to be sent via Ajax
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*/
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public function get_filter_posts($args, $language) {
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if (!empty($language)) {
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global $sitepress;
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$sitepress->switch_lang( $language );
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}
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$query = new WP_Query($args);
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$response = [];
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ob_start();
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include(plugin_dir_path( __FILE__ ) . 'templates/partials/loop.php'); ;
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$response['content'] = ob_get_clean();
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$response['found'] = $query->found_posts;
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return $response;
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}
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} |