Checkout error page

classes/class-wc-checkout.php

@@ -21,6 +21,7 @@ class WC_Checkout {
 	function __construct () {
 		global $woocommerce;
 		
+		add_action('woocommerce_checkout_process',array(&$this,'checkout_process'));
 		add_action('woocommerce_checkout_billing',array(&$this,'checkout_form_billing'));
 		add_action('woocommerce_checkout_shipping',array(&$this,'checkout_form_shipping'));
 		
@@ -60,6 +61,12 @@ class WC_Checkout {
 		$this->checkout_fields = apply_filters('woocommerce_checkout_fields', $this->checkout_fields);
 	}
 	
+	/** Checkout process */
+	function checkout_process() {
+		// When we process the checkout, lets ensure cart items are rechecked to prevent checkout
+		do_action('woocommerce_check_cart_items');
+	}
+		
 	/** Output the billing information form */
 	function checkout_form_billing() {
 		woocommerce_get_template( 'checkout/form-billing.php', array( 'checkout' => $this ) );

readme.txt

@@ -87,6 +87,8 @@ Yes you can! Join in on our GitHub repository :) https://github.com/woothemes/wo
 * Classes added to my-account
 * Fix for price filtering when the shop is the homepage
 * Renamed orderby GET variable to 'sort' to prevent conflicts with permalinks
+* Fixed a bug allowing checkout when items are out of stock
+* Added a cart item error page for checkout, if the items are invalid
 
 = 1.4.2 - 09/02/2012 = 
 * Uninstall fix

shortcodes/shortcode-checkout.php

@@ -21,11 +21,20 @@ function woocommerce_checkout( $atts ) {
 
 	if (sizeof($woocommerce->cart->get_cart())==0) return;
 	
-	$non_js_checkout = (isset($_POST['woocommerce_checkout_update_totals']) && $_POST['woocommerce_checkout_update_totals']) ? true : false;
-	
 	do_action('woocommerce_check_cart_items');
 	
+	if ( $woocommerce->error_count()>0 ) {
+		
+		woocommerce_get_template('checkout/cart-errors.php');
+		
+	} else {
+	
+		$non_js_checkout = (isset($_POST['woocommerce_checkout_update_totals']) && $_POST['woocommerce_checkout_update_totals']) ? true : false;
+		
 		if ( $woocommerce->error_count()==0 && $non_js_checkout) $woocommerce->add_message( __('The order totals have been updated. Please confirm your order by pressing the Place Order button at the bottom of the page.', 'woocommerce') );
 		
 		woocommerce_get_template('checkout/form-checkout.php');
+	
+	}
+	
 }

templates/checkout/cart-errors.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * Cart errors page
+ */
+?>
+
+<?php $woocommerce->show_messages(); ?>
+
+<p><?php _e('There are some issues with the items in your cart (shown above). Please go back to the cart page and resolve these issues before checking out.', 'woocommerce') ?></p>
+
+<?php do_action('woocommerce_cart_has_errors'); ?>
+
+<p><a class="button" href="<?php echo get_permalink(woocommerce_get_page_id('cart')); ?>"><?php _e('&larr; Return To Cart', 'woocommerce') ?></a></p>