WooCommerce purchase page add-to-cart with quantity and AJAX, without customising any templates. See blog post for details: http://snippets.webaware.com.au/snippets/woocommerce-add-to-cart-with-quantity-and-ajax/
<?php
/**
* start the customisation
*/
function custom_woo_before_shop_link() {
add_filter('woocommerce_loop_add_to_cart_link', 'custom_woo_loop_add_to_cart_link', 10, 2);
add_action('woocommerce_after_shop_loop', 'custom_woo_after_shop_loop');
}
add_action('woocommerce_before_shop_loop', 'custom_woo_before_shop_link');
/**
* customise Add to Cart link/button for product loop
* @param string $button
* @param object $product
* @return string
*/
function custom_woo_loop_add_to_cart_link($button, $product) {
// not for variable, grouped or external products
if (!in_array($product->product_type, array('variable', 'grouped', 'external'))) {
// only if can be purchased
if ($product->is_purchasable()) {
// show qty +/- with button
ob_start();
woocommerce_simple_add_to_cart();
$button = ob_get_clean();
// modify button so that AJAX add-to-cart script finds it
$replacement = sprintf('data-product_id="%d" data-quantity="1" $1 ajax_add_to_cart add_to_cart_button product_type_simple ', $product->id);
$button = preg_replace('/(class="single_add_to_cart_button)/', $replacement, $button);
}
}
return $button;
}
/**
* add the required JavaScript
*/
function custom_woo_after_shop_loop() {
?>
<script>
jQuery(function($) {
<?php /* when product quantity changes, update quantity attribute on add-to-cart button */ ?>
$("form.cart").on("change", "input.qty", function() {
$(this.form).find("button[data-quantity]").data("quantity", this.value);
});
<?php /* remove old "view cart" text, only need latest one thanks! */ ?>
$(document.body).on("adding_to_cart", function() {
$("a.added_to_cart").remove();
});
});
</script>
<?php
}