WooCommerce - Create shortcode to display product categories dropdown list

product_categories_dropdown.php

<?php

/**
 * WooCommerce Custom Shortcode
 * --------------------------
 *
 * Register a shortcode that creates a product categories dropdown list
 *
 * Use: [product_categories_dropdown]
 *
 */
add_shortcode( 'product_categories_dropdown', 'woo_product_categories_dropdown' );
function woo_product_categories_dropdown() {
    ob_start();
    $args = array(
        'order'      => 'ASC',
        'hide_empty' => 1,
        'posts_per_page' =>'-1',
        'parent' => 0,
    );
    $product_categories = get_terms( 'product_cat', $args );
    echo "<select name='product_cat' class='dropdown_product_cat'><option value=''>Select Destination/Country</option>";
    foreach( $product_categories as $category ){
        echo "<option value = '" . esc_attr( $category->slug ) . "'>" . esc_html( $category->name ) . "</option>";
    }
    echo "</select>";
	?>
	<script type='text/javascript'>
	/* <![CDATA[ */

    document.addEventListener('DOMContentLoaded',function() {
        document.querySelector('select[name="product_cat"]').onchange=changeEventHandler;
    },false);
    function changeEventHandler(event) {
    if ( event.target.value !=='' ) {
        location.href = "<?php echo home_url(); ?>/?product_cat="+event.target.value;
        }
    }
	/* ]]> */
	</script>
	<?php
	return ob_get_clean();
}
?>