WordPress WooCommerce - Add a variable product to cart using the WC_Cart class

Question

I am trying to add a variable product to the cart of the WordPress plugin, WooCommerce.

So far I have been able to add single/simple products with:

$woocommerce->cart->add_to_cart( [product_id], [quantity] );

However, looking in the WC_Class at the functions signature:

function add_to_cart( $product_id, $quantity = 1, $variation_id = '', $variation = '', $cart_item_data = array() ) {

we can clearly see the function permits inputs of variation_id.

I have tried every combination of nulls and integers along the lines of:

$woocommerce->cart->add_to_cart( 24, 1, 28, null, null ); 

and so on to no avail.

Ive also tried my own hacky approach that tries to recreate the post events performed by WooCommerce's own product page, again with no luck.

<a id="buy_v" href="#">Buy Variable Product !</a>    
<script>    
   $('#buy_v').click(function(e) {
      e.preventDefault();
      addToCartV(24,26,'Red',1);
      return false;
   });    
   function addToCartV(p_id, v_id, c, q) {    
    $.ajax({
      type: 'POST',
      url: '/wp/?product=tee1&add-to-cart=variation&product_id='+p_id,
      data: { 'attribute_colour': c,
              'variation_id':  v_id,
              'quantity':  q,
              'product_id':  p_id},
      success: function(response, textStatus, jqXHR){
            // log a message to the console
            console.log("It worked!");
        }/*,
      dataType: 'JSON'*/
    });    
   }   
</script>

Could anyone suggest where I might be going wrong? Thanks.

Answer 1

For anyone else attempting something similar, here is my approach.

I created a script to be called via ajax that contains the following:

<?php
require_once("../../../wp-blog-header.php");
header("HTTP/1.1 200 OK");
global $woocommerce;

$quantity       = (isset($_REQUEST['qty'])) ? (int) $_REQUEST['qty'] : 1;
$product_id     = (int) apply_filters('woocommerce_add_to_cart_product_id', $_REQUEST['pid']);   
$vid            = (int) apply_filters('woocommerce_add_to_cart_product_id', $_REQUEST['vid']);   

if ($vid > 0) $woocommerce->cart->add_to_cart( $product_id, $quantity, $vid );         
else $woocommerce->cart->add_to_cart( $product_id, $quantity );    

This successfully adds product variations to the cart

Answer 2

Both the above example actually work fine, they just don't display correctly in WooCommerce's own cart.

To make them display correctly, pass in an array for the forth parameter which seems to represent the variation in WooCommerce's own cart:

$arr = array();
$arr['Color'] = 'Green';
$woocommerce->cart->add_to_cart( 24, 1, 28, $arr, null );