Add a quantity selecter on WooCommerce shop pag

How to add a quantity selecter on WooCommerce shop page, this is my functions.php.

I’ve tried the folowing code in my functions.php:

/**
 * Override loop template and show quantities next to add to cart buttons
 */
add_filter( 'woocommerce_loop_add_to_cart_link', 'quantity_inputs_for_woocommerce_loop_add_to_cart_link', 10, 2 );
function quantity_inputs_for_woocommerce_loop_add_to_cart_link( $html, $product ) {
	if ( $product && $product->is_type( 'simple' ) && $product->is_purchasable() && $product->is_in_stock() && ! $product->is_sold_individually() ) {
		$html = '<form action="' . esc_url( $product->add_to_cart_url() ) . '" class="cart" method="post" enctype="multipart/form-data">';
		$html .= woocommerce_quantity_input( array(), $product, false );
		$html .= '<button type="submit" class="button alt">' . esc_html( $product->add_to_cart_text() ) . '</button>';
		$html .= '</form>';
	}
	return $html;
}

Functions.php:

/**
 * Replace add to cart button in the loop.
 */
function iconic_change_loop_add_to_cart() {
	remove_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart', 10 );
	add_action( 'woocommerce_after_shop_loop_item', 'iconic_template_loop_add_to_cart', 10 );
}

add_action( 'init', 'iconic_change_loop_add_to_cart', 10 );

/**
 * Use single add to cart button for variable products.
 */
function iconic_template_loop_add_to_cart() {
	global $product;

	if ( ! $product->is_type( 'variable' ) ) {
		woocommerce_template_loop_add_to_cart();
		return;
	}

	remove_action( 'woocommerce_single_variation', 'woocommerce_single_variation_add_to_cart_button', 20 );
	add_action( 'woocommerce_single_variation', 'iconic_loop_variation_add_to_cart_button', 20 );

	woocommerce_template_single_add_to_cart();
}

/**
 * Customise variable add to cart button for loop.
 *
 * Remove qty selector and simplify.
 */
function iconic_loop_variation_add_to_cart_button() {
	global $product;

	?>
	<div class="woocommerce-variation-add-to-cart variations_button">
		<button type="submit" class="single_add_to_cart_button button"><?php echo esc_html( $product->single_add_to_cart_text() ); ?></button>
		<input type="hidden" name="add-to-cart" value="<?php echo absint( $product->get_id() ); ?>" />
		<input type="hidden" name="product_id" value="<?php echo absint( $product->get_id() ); ?>" />
		<input type="hidden" name="variation_id" class="variation_id" value="0" />
	</div>
	<?php
}