feat: add content feed with AJAX filtering and load more on front page

wp-content/themes/bitwms-child/inc/ajax-filter.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * БИТ.WMS Child Theme — inc/ajax-filter.php
+ *
+ * AJAX handler for the content feed filter bar and "Load more" button.
+ * Registered for both logged-in and non-logged-in users.
+ *
+ * @package bitwms-child
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+    exit;
+}
+
+add_action( 'wp_ajax_bitwms_filter',        'bitwms_ajax_filter_handler' );
+add_action( 'wp_ajax_nopriv_bitwms_filter', 'bitwms_ajax_filter_handler' );
+
+/**
+ * Handle the AJAX filter/load-more request.
+ *
+ * Expected POST parameters:
+ *   - post_type (string) — 'all' or one of: post, case, webinar, course, event, material
+ *   - page      (int)    — page number (1-based)
+ *   - nonce     (string) — security nonce
+ *
+ * Returns JSON: { success: true, data: { html: "...", has_more: bool } }
+ */
+function bitwms_ajax_filter_handler() {
+    // Verify nonce.
+    if ( ! isset( $_POST['nonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['nonce'] ) ), 'bitwms_filter_nonce' ) ) {
+        wp_send_json_error( array( 'message' => 'Security check failed.' ), 403 );
+    }
+
+    $valid_types    = array( 'post', 'case', 'webinar', 'course', 'event', 'material' );
+    $all_post_types = $valid_types;
+
+    $raw_type = isset( $_POST['post_type'] ) ? sanitize_key( $_POST['post_type'] ) : 'all';
+    $page     = isset( $_POST['page'] ) ? max( 1, (int) $_POST['page'] ) : 1;
+
+    if ( 'all' === $raw_type ) {
+        $post_type = $all_post_types;
+    } elseif ( in_array( $raw_type, $valid_types, true ) ) {
+        $post_type = array( $raw_type );
+    } else {
+        $post_type = $all_post_types;
+    }
+
+    $posts_per_page = 6;
+
+    $query = new WP_Query( array(
+        'post_type'      => $post_type,
+        'posts_per_page' => $posts_per_page,
+        'paged'          => $page,
+        'orderby'        => 'date',
+        'order'          => 'DESC',
+        'post_status'    => 'publish',
+    ) );
+
+    $html     = '';
+    $has_more = false;
+
+    if ( $query->have_posts() ) {
+        ob_start();
+        while ( $query->have_posts() ) {
+            $query->the_post();
+            get_template_part( 'templates/content-card' );
+        }
+        $html = ob_get_clean();
+        wp_reset_postdata();
+
+        $has_more = ( $page * $posts_per_page ) < $query->found_posts;
+    }
+
+    wp_send_json_success( array(
+        'html'     => $html,
+        'has_more' => $has_more,
+    ) );
+}

wp-content/themes/bitwms-child/inc/enqueue.php

@@ -16,13 +16,33 @@ add_action( 'wp_enqueue_scripts', 'bitwms_enqueue_scripts', 20 );
 
 function bitwms_enqueue_scripts() {
     $theme_version = wp_get_theme()->get( 'Version' );
+    $theme_uri     = get_stylesheet_directory_uri();
 
     // Sidebar navigation — loaded in footer (5th arg: true).
     wp_enqueue_script(
         'bitwms-sidebar-nav',
-        get_stylesheet_directory_uri() . '/js/sidebar-nav.js',
+        $theme_uri . '/js/sidebar-nav.js',
         array(),           // no dependencies
         $theme_version,
         true               // load in footer
     );
+
+    // Content feed AJAX filter — front page only.
+    if ( is_front_page() ) {
+        wp_enqueue_script(
+            'bitwms-ajax-filter',
+            $theme_uri . '/js/ajax-filter.js',
+            array(),
+            $theme_version,
+            true
+        );
+        wp_localize_script(
+            'bitwms-ajax-filter',
+            'bitwmsAjax',
+            array(
+                'url'   => admin_url( 'admin-ajax.php' ),
+                'nonce' => wp_create_nonce( 'bitwms_filter_nonce' ),
+            )
+        );
+    }
 }