WooCommerce Add to cart button error: "choose product options" - php

Question

In WooCommerce variable.php I have this code:
<?php
/**
* Variable product add to cart
*
* #author WooThemes
* #package WooCommerce/Templates
* #version 2.1.0
*/
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
global $product, $post;
?>
<?php do_action( 'woocommerce_before_add_to_cart_form' ); ?>
<form class="variations_form cart" method="post" enctype='multipart/form-data' data-product_id="<?php echo $post->ID; ?>" data-product_variations="<?php echo esc_attr( json_encode( $available_variations ) ) ?>">
<?php if ( ! empty( $available_variations ) ) : ?>
<table class="variations" cellspacing="0">
<tbody>
<?php $loop = 0; foreach ( $attributes as $name => $options ) : $loop++; ?>
<tr>
<td class="label"><label for="<?php echo sanitize_title($name); ?>"><?php echo wc_attribute_label( $name ); ?></label></td>
<td class="value"><select id="<?php echo esc_attr( sanitize_title( $name ) ); ?>" name="attribute_<?php echo sanitize_title( $name ); ?>">
<option value=""><?php echo __( 'Choose an option', 'woocommerce' ) ?>…</option>
<?php
if ( is_array( $options ) ) {
if ( isset( $_REQUEST[ 'attribute_' . sanitize_title( $name ) ] ) ) {
$selected_value = $_REQUEST[ 'attribute_' . sanitize_title( $name ) ];
} elseif ( isset( $selected_attributes[ sanitize_title( $name ) ] ) ) {
$selected_value = $selected_attributes[ sanitize_title( $name ) ];
} else {
$selected_value = '';
}
// Get terms if this is a taxonomy - ordered
if ( taxonomy_exists( sanitize_title( $name ) ) ) {
$orderby = wc_attribute_orderby( sanitize_title( $name ) );
switch ( $orderby ) {
case 'name' :
$args = array( 'orderby' => 'name', 'hide_empty' => false, 'menu_order' => false );
break;
case 'id' :
$args = array( 'orderby' => 'id', 'order' => 'ASC', 'menu_order' => false, 'hide_empty' => false );
break;
case 'menu_order' :
$args = array( 'menu_order' => 'ASC', 'hide_empty' => false );
break;
}
$terms = get_terms( sanitize_title( $name ), $args );
foreach ( $terms as $term ) {
if ( ! in_array( $term->slug, $options ) )
continue;
echo '<option value="' . esc_attr( $term->slug ) . '" ' . selected( sanitize_title( $selected_value ), sanitize_title( $term->slug ), false ) . '>' . apply_filters( 'woocommerce_variation_option_name', $term->name ) . '</option>';
}
} else {
foreach ( $options as $option ) {
echo '<option value="' . esc_attr( sanitize_title( $option ) ) . '" ' . selected( sanitize_title( $selected_value ), sanitize_title( $option ), false ) . '>' . esc_html( apply_filters( 'woocommerce_variation_option_name', $option ) ) . '</option>';
}
}
}
?>
</select> <?php
if ( sizeof( $attributes ) == $loop )
echo '<a class="reset_variations" href="#reset">' . __( 'Clear selection', 'woocommerce' ) . '</a>';
?></td>
</tr>
<?php endforeach;?>
</tbody>
</table>
<?php do_action( 'woocommerce_before_add_to_cart_button' ); ?>
<div class="single_variation_wrap" style="">
<?php do_action( 'woocommerce_before_single_variation' ); ?>
<div class="single_variation"></div>
<div class="variations_button">
<?php woocommerce_quantity_input(); ?>
<button type="submit" class="single_add_to_cart_button button alt"><?php echo $product->single_add_to_cart_text(); ?></button>
</div>
<input name="add-to-cart" value="<?php echo $product->id; ?>" />
<input type="hidden" name="product_id" value="<?php echo esc_attr( $post->ID ); ?>" />
<input type="hidden" name="variation_id" value="" />
<?php do_action( 'woocommerce_after_single_variation' ); ?>
</div>
<?php do_action( 'woocommerce_after_add_to_cart_button' ); ?>
<?php else : ?>
<p class="stock out-of-stock"><?php _e( 'This product is currently out of stock and unavailable.', 'woocommerce' ); ?></p>
<?php endif; ?>
</form>
<?php do_action( 'woocommerce_after_add_to_cart_form' ); ?>
But when I choose the size and then click Add to cart, I get an error with which says "choose product options".
Does somebody know how to fix this? It's like the form and the button aren't working "together".

Answer 1

I found the answer.
The thing you had to fill in, was for the <input type="hidden" name="variation_id" value="" />
So i gave it as value the product id and it worked :D
So like this:
<input type="hidden" name="variation_id" value="<?php echo $product->id; ?>" />