Enable select2 for wp_dropdown_categories dropdown in WooCommerce

I have revisited a bit your code as for example in shortcode functions the content should always be returned and not echoed.

I have renamed the shortcode to something better, shorter… and enabled select2 for both dropdowns.

The function code:

add_shortcode( 'new_search', 'new_filter_search_shortcode' );function new_filter_search_shortcode( $atts ) {    extract( shortcode_atts( array(        'taxonomy'  => 'product_cat', // Product category taxonomy (by default)    ), $atts ) );    ob_start(); // Start buffering    ?>    <link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-beta.1/dist/css/select2.min.css" rel="stylesheet" />    <form name="myform" method="GET" action="<?php echo esc_url(home_url('/')); ?>">    <?php     if (class_exists('WooCommerce') ) {        if(isset($_REQUEST[$taxonomy]) && ! empty($_REQUEST[$taxonomy])) {            $optsetlect = esc_attr($_REQUEST[$taxonomy]);        } else {            $optsetlect = 0;        }        $class = 'cate-dropdown hidden-xs';        wp_dropdown_categories( array(            'show_option_all'   => esc_html__( 'Make / Model', 'woocommerce' ),            'orderby'           => 'name',            'child_of'          => 142,            'hierarchical'      => 1,            'echo'              => 1,            'depth'             => 2,            'show_count'        => 1,            'value_field'       => 'name',            'selected'          => $optsetlect,            'taxonomy'          => $taxonomy,            'name'              => 'model',            'class'             => $class,        ) );        wp_dropdown_categories( array(            'show_option_all'   => esc_html__( 'Year', 'woocommerce' ),            'orderby'           => 'name',            'child_of'          => 69,            'hierarchical'      => 1,            'echo'              => 1,            'depth'             => 2,            'show_count'        => 0,            'value_field'       => 'slug',            'selected'          => $optsetlect,            'taxonomy'          => $taxonomy,            'name'              => 'year',            'class'             => $class,        ) );    }    $search_text = esc_html__('Search', 'woocommerce');    ?>    <button type="submit" title="<?php echo $search_text; ?>" class="search-btn-bg"><span><?php echo $search_text;?></span></button>    </form>    <?php    // Enable select2 for both dropdowns    if (class_exists('WooCommerce') ) {    ?>    <script>    jQuery(function($){        $('select#model').select2();        $('select#year').select2();    });    </script>    <?php    wp_enqueue_script( 'select2' );    }    return ob_get_clean(); // return buffered content}

Code goes in functions.php file of your active child theme (or active theme). Tested and works.

USAGE: [new_search] or echo do_shortcode('[new_search]'); (inside PHP code).