eduinaf-ajax-filter-posts/class-ajax-filter-posts.php

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<?php
/**
* The file that defines the core plugin class
*
* A class definition that includes attributes and functions used across both the
* public-facing side of the site and the admin area.
*
* @link http://www.robbertdekuiper.com
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* @since 0.1.0
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*
* @package Ajax_Filter_Posts
*/
/**
* The core plugin class.
*
* The plugin logic lives here
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*
* Also maintains the unique identifier of this plugin as well as the current
* version of the plugin.
*
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* @since 0.1.0
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* @package Ajax_Filter_Posts
* @author Robbert de Kuiper <mail@robbertdekuiper.com>
*/
class Ajax_Filter_Posts {
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/**
* The unique identifier of this plugin.
*
* @var string $plugin_name The string used to uniquely identify this plugin.
*/
protected $plugin_name;
/**
* The current version of the plugin.
*
* @var String $version The current version of the plugin.
*/
protected $version;
/**
* Define the core functionality of the plugin.
*
* Set the plugin name and the plugin version that can be used throughout the plugin.
* Load the dependencies, define the locale, and set the hooks.
*
*/
public function __construct() {
$this->plugin_name = 'ajax-filter-posts';
$this->version = '0.3.0';
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add_action( 'plugins_loaded', [$this, 'load_textdomain'] );
add_action( 'wp_enqueue_scripts', [$this,'add_scripts'] );
add_action('wp_ajax_process_filter_change', [$this, 'process_filter_change']);
add_action('wp_ajax_nopriv_process_filter_change', [$this, 'process_filter_change']);
add_shortcode( 'ajax_filter_posts', [$this, 'create_shortcode']);
}
/**
* Set the plugins language domain
*/
public function load_textdomain() {
if (strpos( __FILE__, basename( WPMU_PLUGIN_DIR ))) {
load_muplugin_textdomain( 'ajax-filter-posts', basename( dirname( __FILE__ )) . '/languages' );
} else {
load_plugin_textdomain( 'ajax-filter-posts', false, basename(dirname( __FILE__ )) . '/languages' );
}
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}
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/**
* Load the required assets for this plugin.
*
*/
public function add_scripts() {
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$script_variables = [
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'nonce' => wp_create_nonce( 'filter-posts-nonce' ),
'ajaxUrl' => admin_url( 'admin-ajax.php' ),
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'timeoutMessage' => __('Troppo tempo per caricare i contenuti. Per favore ricarica e prova di nuovo.', 'ajax-filter-posts'),
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'serverErrorMessage' => __('Nessuna risposta. Per favore ricarica e prova di nuovo.', 'ajax-filter-posts'),
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];
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// IF WPML is installed add language variable to set variable later during the query
// WPML can't figure out which language to query, when posts are loaded via AJAX.
if (function_exists('icl_object_id')) {
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$script_variables['language'] = ICL_LANGUAGE_CODE;
}
wp_enqueue_script( 'ajax-filter', plugins_url('/assets/js/ajax-filter-posts.js', __FILE__), [], '', true );
wp_enqueue_style( 'ajax-filter', plugins_url('/assets/css/ajax-filter-posts.css', __FILE__), []);
wp_localize_script( 'ajax-filter', 'filterPosts', $script_variables);
}
/**
* Create shortcode
*
* @param Array $atts Array of given attributes
* @return String HTML initial rendered by shortcode
*/
public function create_shortcode($atts) {
$attributes = shortcode_atts( array(
'post_type'=> 'post',
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'tax' => ['post_tag'],
'posts_per_page' => 12, // How many posts per page,
), $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'],
'posts_per_page' => $attributes['posts_per_page'],
'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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ob_start();
include( $this->get_local_template('base.php') );
return ob_get_clean();
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}
/**
* Get a list of filters and terms, based on the taxonomies set in the shortcode
*
* @param String $taxonomies Comma seperated list of taxonomies
* @return Array List of taxonomies with terms
*/
protected function get_filterlist($taxonomies) {
$filterlists = explode(',', $taxonomies);
$filterlists = array_map('trim', $filterlists);
$filterlists = array_filter($filterlists, 'taxonomy_exists');
$filterlists = $this->get_termlist($filterlists);
return $filterlists;
}
/**
* Get a list of filters and terms
*
* @param string $taxonomies A single taxonomy
* @return Array Taxonomy name and list of terms associated with the taxonomy
*/
protected function get_termlist($taxonomies) {
$list = [];
foreach ($taxonomies as $taxonomy) {
$terms = get_terms($taxonomy);
if (!empty($terms)) {
$list[] = [
'name' => get_taxonomy($taxonomy)->labels->singular_name,
'filters' => $terms,
];
}
}
return $list;
}
/**
* Send new posts query via AJAX after filters are changed in the frontend
*
* @return String HTML string with parsed posts or an error message
*/
public function process_filter_change() {
check_ajax_referer( 'filter-posts-nonce', 'nonce' );
$post_type = sanitize_text_field($_POST['params']['postType']);
$tax = $this->get_tax_query_vars($_POST['params']['tax']);
$page = intval($_POST['params']['page']);
$quantity = intval($_POST['params']['quantity']);
$language = sanitize_text_field($_POST['params']['language']);
$args = [
'paged' => $page,
'post_type' => $post_type,
'posts_per_page' => $quantity,
'tax_query' => $tax,
'post_status' => 'publish'
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];
$response = $this->get_filter_posts($args, $language);
if ($response) {
wp_send_json_success($response);
} else {
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wp_send_json_error(__('Qualcosa è andato storto. Per favore ricarica e prova di nuovo.', 'ajax-filter-posts'));
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}
die();
}
/**
* Converts the queried page number to a real page number
*
* @param Object $query WP Query
* @return Integer Current page
*/
private function get_page_number($query){
$query_page = $query->get( 'paged' );
return $query_page == 0 ? 1 : $query_page;
}
/**
* Check if the queried page is the last page of the query
*
* @param Object $query WP Query
* @return Boolean true if is last page
*/
private function is_last_page($query) {
return $this->get_page_number($query) >= $query->max_num_pages;
}
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/**
* Get the query paramaters based on set filters
*
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* @param array $taxonomies list of taxanomies with terms
* @return array taxonomies prepared for the WordPress Query
*/
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protected function get_tax_query_vars($taxonomies) {
$tax_query = [];
foreach ($taxonomies as $taxonomy => $terms) {
$taxonomy = sanitize_text_field($taxonomy);
if (taxonomy_exists($taxonomy)) {
$valid_terms = $this->get_valid_terms($terms, $taxonomy);
if ($valid_terms) {
$term_query = [
'taxonomy' => $taxonomy,
'field' => 'slug',
'terms' => $valid_terms,
];
$tax_query[] = $term_query;
}
}
}
if( count($tax_query) > 1 ) {
$tax_query[] = ['relation' => 'OR'];
}
return $tax_query;
}
/**
* Check of the given thers are valid terms
*
* @param array $terms List of terms set by the filters
* @param string $tax Taxomy associated with the terms
* @return array List of valid terms
*/
protected function get_valid_terms($terms, $tax) {
$valid_terms = [];
foreach ($terms as $term) {
$term = sanitize_text_field($term);
if (term_exists($term,$tax)) {
$valid_terms[] = $term;
}
}
return $valid_terms;
}
/**
* Set up a filters query and parse the template
*
* @param array $args Arguments for the WordPress Query
* @return string HTMl to be sent via Ajax
*/
public function get_filter_posts($args, $language) {
if (function_exists('icl_object_id') && !empty($language)) {
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global $sitepress;
$sitepress->switch_lang( $language );
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}
$query = new WP_Query($args);
$plural_post_name = strtolower(get_post_type_object($query->query['post_type'])->labels->name);
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$response = [];
ob_start();
include( $this->get_local_template('partials/loop.php'));
$response['content'] = ob_get_clean();
$response['found'] = $query->found_posts;
return $response;
}
/**
* Locate template.
*
* Locate the called template.
* Search Order:
* 1. /themes/theme/ajax-posts-filters/$template_name
* 2. /plugins/ajax-filter-posts/templates/$template_name.
*
* @since 0.3.0
*
* @param string $template_name Template to load.
* @return string Path to the template file.
*/
public function get_local_template($template_name) {
if (empty($template_name)) return false;
$template = locate_template('ajax-filter-posts/' . $template_name);
// If template not in theme, get plugins template file.
if ( !$template ) {
$template = plugin_dir_path( __FILE__ ) . 'templates/' . $template_name;
}
if ( !file_exists( $template ) ) {
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_doing_it_wrong( __FUNCTION__, sprintf( '<code>%s</code> non esiste.', $template ), '4.6.0' );
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return;
}
return $template;
}
}