wcfm-restrict-duplicate-product-tile

add_action('after_wcfm_products_manage', function() {
    ?>
    <style>
        #wcfm_products_manage_form .wcfm-title-error {
            margin: -20px 0 10px !important;
            color: red;
            font-size: 12px;
            margin-top: 5px;
        }
    </style>
    <script>
        jQuery(function($) {
            const $form = $('#wcfm_products_manage_form');
            const displayError = (message) => {
                $form.find('.wcfm-title-error').remove();
                if (message) {
                    $form.find('#pro_title').after(`<p class="wcfm-title-error wcfm_validation_error">${message}</p>`);
                }
            };
            if($form.length) {
                const $productTitle = $form.find('#pro_title');
                $($productTitle).on('blur', function() {
                    displayError(null);
                    if($productTitle.length && $productTitle.val()) {
                        let title = $productTitle.val().trim();
                        $('#wcfm_products_manage_form_general_expander').block({
                            message: null,
                            overlayCSS: {
                                background: '#fff',
                                opacity: 0.6
                            }
                        });
                        var data = {
                            action: 'wcfm_is_product_title_exists',
                            title: title,
                            product_id: $form.find('#pro_id').val() || 0,
                            wcfm_ajax_nonce: wcfm_params.wcfm_ajax_nonce,
                        }
                        $.ajax({
                            type: 'POST',
                            url: wcfm_params.ajax_url,
                            data: data,
                            success: function(response) {
                                if(!response.success) {
                                    displayError(response.data);
                                    $productTitle.focus().select();
                                }
                                $('#wcfm_products_manage_form_general_expander').unblock();
                            }
                        });
                    }
                });
            }

        });
    </script>
    <?php
});
add_action('wp_ajax_wcfm_is_product_title_exists', function() {
    if ( ! check_ajax_referer( 'wcfm_ajax_nonce', 'wcfm_ajax_nonce', false ) ) {
        wp_send_json_error( esc_html__( 'Invalid nonce! Refresh your page and try again.', 'wc-frontend-manager' ) );
    }
    if ( !current_user_can( 'manage_woocommerce' ) && !current_user_can( 'wcfm_vendor' ) && !current_user_can( 'seller' ) && !current_user_can( 'vendor' ) && !current_user_can( 'shop_staff' ) ) {
        wp_send_json_error( esc_html__( 'You don&#8217;t have permission to do this.', 'woocommerce' ) );
    }
    $title = isset($_POST['title']) ? sanitize_text_field($_POST['title']) : '';
    $product_id = isset($_POST['product_id']) ? absint($_POST['product_id']) : 0;
    if(!$title) {
        wp_send_json_error('Title is required');
    }
    $args = [
        'post_type' => 'product',
        'post_status' => 'any',
        's' => $title,
        'posts_per_page' => 1,
        'post__not_in' => [$product_id],
    ];
    $query = new WP_Query($args);
    if($query->have_posts()) {
        wp_send_json_error('Product with this title already exists');
    } else {
        wp_send_json_success('Product title is available');
    }
});