function product_dropdown_shortcode() {
    ob_start();

    // Query to get all products
    $products = get_posts(array(
        'post_type' => 'product',
        'posts_per_page' => -1,
    ));

    // Output the dropdown HTML
    ?>
    <select id="product_dropdown">
        <option value="">Select a product</option>
        <?php foreach ($products as $product) : ?>
            <option value="<?php echo esc_attr($product->ID); ?>"><?php echo esc_html($product->post_title); ?></option>
        <?php endforeach; ?>
    </select>
    <script>
        jQuery(function($) {
            // Initialize select2 for searchable dropdown
            $('#product_dropdown').select2();
        });
    </script>
    <?php

    return ob_get_clean();
}
add_shortcode('product_dropdown', 'product_dropdown_shortcode');
function enqueue_select2() {
    // Enqueue Select2 library
    wp_enqueue_script('select2', 'https://cdnjs.cloudflare.com/ajax/libs/select2/4.1.0-beta.1/js/select2.min.js', array('jquery'), '4.1.0-beta.1', true);
    wp_enqueue_style('select2', 'https://cdnjs.cloudflare.com/ajax/libs/select2/4.1.0-beta.1/css/select2.min.css', array(), '4.1.0-beta.1');
}
add_action('wp_enqueue_scripts', 'enqueue_select2');