From 8f1f00108573c49250159f17cb6dce9b3bf4cf48 Mon Sep 17 00:00:00 2001
From: nekenny <nekenny@ya.ru>
Date: Fri, 3 Apr 2026 01:13:09 +0500
Subject: [PATCH] feat: add content feed with AJAX filtering and load more on
 front page

---
 wp-content/themes/bitwms-child/functions.php  |   1 +
 .../themes/bitwms-child/inc/ajax-filter.php   |  78 +++++++++++
 .../themes/bitwms-child/inc/enqueue.php       |  22 +++-
 .../themes/bitwms-child/js/ajax-filter.js     | 123 ++++++++++++++++++
 wp-content/themes/bitwms-child/style.css      | 105 +++++++++++++++
 .../bitwms-child/templates/content-card.php   |  78 +++++++++++
 .../bitwms-child/templates/section-filter.php |  78 +++++++++++
 7 files changed, 484 insertions(+), 1 deletion(-)
 create mode 100644 wp-content/themes/bitwms-child/inc/ajax-filter.php
 create mode 100644 wp-content/themes/bitwms-child/js/ajax-filter.js
 create mode 100644 wp-content/themes/bitwms-child/templates/content-card.php
 create mode 100644 wp-content/themes/bitwms-child/templates/section-filter.php

diff --git a/wp-content/themes/bitwms-child/functions.php b/wp-content/themes/bitwms-child/functions.php
index 84a367d..df901f4 100644
--- a/wp-content/themes/bitwms-child/functions.php
+++ b/wp-content/themes/bitwms-child/functions.php
@@ -45,6 +45,7 @@ $bitwms_includes = array(
     'inc/enqueue.php',
     'inc/cpt.php',
     'inc/acf-fields.php',
+    'inc/ajax-filter.php',
 );
 
 foreach ( $bitwms_includes as $bitwms_file ) {
diff --git a/wp-content/themes/bitwms-child/inc/ajax-filter.php b/wp-content/themes/bitwms-child/inc/ajax-filter.php
new file mode 100644
index 0000000..af1a160
--- /dev/null
+++ b/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,
+    ) );
+}
diff --git a/wp-content/themes/bitwms-child/inc/enqueue.php b/wp-content/themes/bitwms-child/inc/enqueue.php
index 6488f09..632754f 100644
--- a/wp-content/themes/bitwms-child/inc/enqueue.php
+++ b/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' ),
+            )
+        );
+    }
 }
diff --git a/wp-content/themes/bitwms-child/js/ajax-filter.js b/wp-content/themes/bitwms-child/js/ajax-filter.js
new file mode 100644
index 0000000..d71a330
--- /dev/null
+++ b/wp-content/themes/bitwms-child/js/ajax-filter.js
@@ -0,0 +1,123 @@
+/**
+ * БИТ.WMS Child Theme — js/ajax-filter.js
+ *
+ * Handles filter button clicks and "Load more" for the content feed section.
+ * Communicates with the WordPress AJAX handler (bitwms_ajax_filter_handler).
+ *
+ * Global: bitwmsAjax  { url: string, nonce: string }
+ */
+
+( function () {
+    'use strict';
+
+    document.addEventListener( 'DOMContentLoaded', function () {
+        var filterBar   = document.querySelector( '.filter-bar' );
+        var contentGrid = document.getElementById( 'content-grid' );
+        var loadMoreBtn = document.getElementById( 'load-more-btn' );
+
+        if ( ! filterBar || ! contentGrid ) {
+            return;
+        }
+
+        var currentFilter = 'all';
+        var currentPage   = 1;
+        var isLoading     = false;
+
+        // ---------------------------------------------------------------
+        // Filter button click
+        // ---------------------------------------------------------------
+        filterBar.addEventListener( 'click', function ( e ) {
+            var btn = e.target.closest( '.filter-bar__btn' );
+            if ( ! btn ) return;
+
+            var filter = btn.getAttribute( 'data-filter' );
+            if ( filter === currentFilter ) return;
+
+            // Update active state.
+            filterBar.querySelectorAll( '.filter-bar__btn' ).forEach( function ( b ) {
+                b.classList.remove( 'filter-bar__btn--active' );
+                b.setAttribute( 'aria-selected', 'false' );
+            } );
+            btn.classList.add( 'filter-bar__btn--active' );
+            btn.setAttribute( 'aria-selected', 'true' );
+
+            currentFilter = filter;
+            currentPage   = 1;
+
+            loadContent( false );
+        } );
+
+        // ---------------------------------------------------------------
+        // Load more button click
+        // ---------------------------------------------------------------
+        if ( loadMoreBtn ) {
+            loadMoreBtn.addEventListener( 'click', function () {
+                if ( isLoading ) return;
+                currentPage += 1;
+                loadContent( true );
+            } );
+        }
+
+        // ---------------------------------------------------------------
+        // loadContent( append )
+        //   append === false: replace grid content
+        //   append === true:  append to existing grid content
+        // ---------------------------------------------------------------
+        function loadContent( append ) {
+            if ( isLoading ) return;
+            isLoading = true;
+
+            if ( loadMoreBtn ) {
+                loadMoreBtn.disabled = true;
+                loadMoreBtn.textContent = loadMoreBtn.getAttribute( 'data-loading' ) || 'Загрузка…';
+            }
+
+            var formData = new FormData();
+            formData.append( 'action',    'bitwms_filter' );
+            formData.append( 'nonce',     bitwmsAjax.nonce );
+            formData.append( 'post_type', currentFilter );
+            formData.append( 'page',      currentPage );
+
+            fetch( bitwmsAjax.url, {
+                method: 'POST',
+                body:   formData,
+            } )
+                .then( function ( response ) {
+                    return response.json();
+                } )
+                .then( function ( data ) {
+                    if ( ! data.success ) return;
+
+                    var html    = data.data.html;
+                    var hasMore = data.data.has_more;
+
+                    if ( append ) {
+                        contentGrid.insertAdjacentHTML( 'beforeend', html );
+                    } else {
+                        contentGrid.innerHTML = html || '<p>Материалы не найдены.</p>';
+                    }
+
+                    // Show/hide load-more button.
+                    if ( loadMoreBtn ) {
+                        if ( hasMore ) {
+                            loadMoreBtn.style.display = '';
+                            loadMoreBtn.disabled      = false;
+                            loadMoreBtn.textContent   = 'Загрузить ещё';
+                        } else {
+                            loadMoreBtn.style.display = 'none';
+                        }
+                    }
+                } )
+                .catch( function ( err ) {
+                    console.error( 'bitwms filter error:', err );
+                    if ( loadMoreBtn ) {
+                        loadMoreBtn.disabled    = false;
+                        loadMoreBtn.textContent = 'Загрузить ещё';
+                    }
+                } )
+                .finally( function () {
+                    isLoading = false;
+                } );
+        }
+    } );
+} )();
diff --git a/wp-content/themes/bitwms-child/style.css b/wp-content/themes/bitwms-child/style.css
index 2e4e8dc..fa7d13b 100644
--- a/wp-content/themes/bitwms-child/style.css
+++ b/wp-content/themes/bitwms-child/style.css
@@ -720,3 +720,108 @@ body.sidebar-overlay::after {
     .clients-section { padding: 40px 0 48px; }
     .clients-section__grid { gap: 16px; }
 }
+
+/* ==========================================================================
+   Task 9: Content feed — filter bar + content grid (AJAX)
+   ========================================================================== */
+
+/* --- Filter bar --- */
+.filter-bar {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 8px;
+    margin-bottom: 32px;
+    padding-bottom: 24px;
+    border-bottom: 1px solid var(--color-gray-light);
+}
+
+.filter-bar__btn {
+    padding: 8px 20px;
+    font-size: 0.875rem;
+    background: none;
+    border: 1px solid var(--color-gray-light);
+    cursor: pointer;
+    color: var(--color-black);
+}
+
+.filter-bar__btn:hover {
+    border-color: var(--color-black);
+}
+
+.filter-bar__btn--active {
+    background: var(--color-black);
+    color: var(--color-white);
+    border-color: var(--color-black);
+    font-weight: 700;
+}
+
+/* --- Content grid --- */
+.content-grid {
+    display: grid;
+    grid-template-columns: repeat(3, 1fr);
+    gap: 24px;
+    margin-bottom: 32px;
+}
+
+.content-card__link {
+    display: block;
+    text-decoration: none;
+    color: inherit;
+}
+
+.content-card__link:hover .content-card__title {
+    color: var(--color-primary);
+}
+
+.content-card__image {
+    aspect-ratio: 16 / 10;
+    overflow: hidden;
+    margin-bottom: 16px;
+    background: var(--color-gray-light);
+}
+
+.content-card__image img {
+    width: 100%;
+    height: 100%;
+    object-fit: cover;
+}
+
+.content-card__placeholder {
+    width: 100%;
+    height: 100%;
+}
+
+.content-card__title {
+    font-size: 1.125rem;
+    margin: 0 0 8px;
+    line-height: 1.3;
+}
+
+.content-card__excerpt {
+    font-size: 0.875rem;
+    color: var(--color-gray-text);
+    margin: 0 0 12px;
+}
+
+.content-card__meta {
+    font-size: 0.75rem;
+    color: var(--color-gray-text);
+}
+
+.content-feed__more {
+    text-align: center;
+    margin-bottom: 60px;
+}
+
+/* --- Responsive breakpoints --- */
+@media (max-width: 1024px) {
+    .content-grid {
+        grid-template-columns: repeat(2, 1fr);
+    }
+}
+
+@media (max-width: 767px) {
+    .content-grid {
+        grid-template-columns: 1fr;
+    }
+}
diff --git a/wp-content/themes/bitwms-child/templates/content-card.php b/wp-content/themes/bitwms-child/templates/content-card.php
new file mode 100644
index 0000000..d9c7336
--- /dev/null
+++ b/wp-content/themes/bitwms-child/templates/content-card.php
@@ -0,0 +1,78 @@
+<?php
+/**
+ * БИТ.WMS Child Theme — templates/content-card.php
+ *
+ * Universal content card used in the content feed section and AJAX responses.
+ * Reads the current post from The Loop (global $post).
+ *
+ * @package bitwms-child
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+    exit;
+}
+
+// Map post_type to label. For 'post' also check for "news" category.
+$type_labels = array(
+    'case'     => __( 'Кейс', 'bitwms-child' ),
+    'webinar'  => __( 'Вебинар', 'bitwms-child' ),
+    'course'   => __( 'Курс', 'bitwms-child' ),
+    'event'    => __( 'Мероприятие', 'bitwms-child' ),
+    'material' => __( 'Материал', 'bitwms-child' ),
+);
+
+$post_type  = get_post_type();
+$badge_text = '';
+
+if ( 'post' === $post_type ) {
+    if ( has_category( 'news' ) ) {
+        $badge_text = __( 'Новость', 'bitwms-child' );
+    } else {
+        $badge_text = __( 'Статья', 'bitwms-child' );
+    }
+} elseif ( isset( $type_labels[ $post_type ] ) ) {
+    $badge_text = $type_labels[ $post_type ];
+}
+
+// Trim excerpt to 15 words.
+$excerpt = get_the_excerpt();
+if ( $excerpt ) {
+    $words   = explode( ' ', $excerpt );
+    $excerpt = implode( ' ', array_slice( $words, 0, 15 ) );
+    if ( count( $words ) > 15 ) {
+        $excerpt .= '…';
+    }
+}
+?>
+
+<article class="content-card" data-post-type="<?php echo esc_attr( $post_type ); ?>">
+    <a href="<?php the_permalink(); ?>" class="content-card__link">
+
+        <div class="content-card__image">
+            <?php if ( has_post_thumbnail() ) : ?>
+                <?php the_post_thumbnail( 'medium_large', array( 'alt' => esc_attr( get_the_title() ) ) ); ?>
+            <?php else : ?>
+                <div class="content-card__placeholder" aria-hidden="true"></div>
+            <?php endif; ?>
+        </div>
+
+        <div class="content-card__body">
+            <?php if ( $badge_text ) : ?>
+                <span class="badge"><?php echo esc_html( $badge_text ); ?></span>
+            <?php endif; ?>
+
+            <h3 class="content-card__title"><?php the_title(); ?></h3>
+
+            <?php if ( $excerpt ) : ?>
+                <p class="content-card__excerpt"><?php echo esc_html( $excerpt ); ?></p>
+            <?php endif; ?>
+
+            <div class="content-card__meta">
+                <time datetime="<?php echo esc_attr( get_the_date( 'Y-m-d' ) ); ?>">
+                    <?php echo esc_html( get_the_date( 'd.m.Y' ) ); ?>
+                </time>
+            </div>
+        </div>
+
+    </a>
+</article>
diff --git a/wp-content/themes/bitwms-child/templates/section-filter.php b/wp-content/themes/bitwms-child/templates/section-filter.php
new file mode 100644
index 0000000..3f9aa15
--- /dev/null
+++ b/wp-content/themes/bitwms-child/templates/section-filter.php
@@ -0,0 +1,78 @@
+<?php
+/**
+ * БИТ.WMS Child Theme — templates/section-filter.php
+ *
+ * Content feed section with tag-based filter bar and "Load more" button.
+ * Initial query fetches 6 posts across all 6 custom post types, ordered by date DESC.
+ *
+ * @package bitwms-child
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+    exit;
+}
+
+$filter_buttons = array(
+    'all'     => __( 'Все', 'bitwms-child' ),
+    'post'    => __( 'Статьи', 'bitwms-child' ),
+    'case'    => __( 'Кейсы', 'bitwms-child' ),
+    'webinar' => __( 'Вебинары', 'bitwms-child' ),
+    'course'  => __( 'Курсы', 'bitwms-child' ),
+    'event'   => __( 'Мероприятия', 'bitwms-child' ),
+    'material'=> __( 'Материалы', 'bitwms-child' ),
+);
+
+$post_types = array( 'post', 'case', 'webinar', 'course', 'event', 'material' );
+$posts_per_page = 6;
+
+$initial_query = new WP_Query( array(
+    'post_type'      => $post_types,
+    'posts_per_page' => $posts_per_page,
+    'orderby'        => 'date',
+    'order'          => 'DESC',
+    'post_status'    => 'publish',
+) );
+?>
+
+<section class="content-feed">
+    <div class="container">
+
+        <div class="filter-bar" role="tablist">
+            <?php foreach ( $filter_buttons as $value => $label ) : ?>
+                <button
+                    class="filter-bar__btn<?php echo $value === 'all' ? ' filter-bar__btn--active' : ''; ?>"
+                    data-filter="<?php echo esc_attr( $value ); ?>"
+                    role="tab"
+                    aria-selected="<?php echo $value === 'all' ? 'true' : 'false'; ?>"
+                >
+                    <?php echo esc_html( $label ); ?>
+                </button>
+            <?php endforeach; ?>
+        </div>
+
+        <div class="content-grid" id="content-grid">
+            <?php if ( $initial_query->have_posts() ) : ?>
+                <?php while ( $initial_query->have_posts() ) : $initial_query->the_post(); ?>
+                    <?php get_template_part( 'templates/content-card' ); ?>
+                <?php endwhile; ?>
+                <?php wp_reset_postdata(); ?>
+            <?php else : ?>
+                <p><?php esc_html_e( 'Материалы не найдены.', 'bitwms-child' ); ?></p>
+            <?php endif; ?>
+        </div>
+
+        <?php if ( $initial_query->found_posts > $posts_per_page ) : ?>
+            <div class="content-feed__more">
+                <button
+                    class="btn btn--outline load-more-btn"
+                    id="load-more-btn"
+                    data-page="1"
+                    data-filter="all"
+                >
+                    <?php esc_html_e( 'Загрузить ещё', 'bitwms-child' ); ?>
+                </button>
+            </div>
+        <?php endif; ?>
+
+    </div>
+</section>