When handling variations, priority from top to bottom - disabled variations still taking into consideration allow you to exclude certain combinations when using 'all' for variations with lower priority. Message displayed if a variation is unavailable.

@coenjacobs please review

assets/js/frontend/add-to-cart-variation.js

@@ -386,6 +386,11 @@
 				        $variation_form.find('.variations_button').hide();
 			        }
 
+			        if ( ! variation.variation_is_visible ) {
+			        	$variation_form.find('.variations_button').hide();
+			        	$variation_form.find('.single_variation').html( '<p>' + wc_add_to_cart_variation_params.i18n_unavailable_text + '</p>' );
+			        }
+
 			        if ( variation.min_qty )
 			        	$single_variation_wrap.find('input[name=quantity]').attr( 'min', variation.min_qty ).val( variation.min_qty );
 			        else

includes/class-wc-frontend-scripts.php

@@ -141,6 +141,7 @@ class WC_Frontend_Scripts {
 
 		wp_localize_script( 'wc-add-to-cart-variation', 'wc_add_to_cart_variation_params', apply_filters( 'wc_add_to_cart_variation_params', array(
 			'i18n_no_matching_variations_text' => esc_attr__( 'Sorry, no products matched your selection. Please choose a different combination.', 'woocommerce' ),
+			'i18n_unavailable_text' => esc_attr__( 'Sorry, this product is unavailable. Please choose a different combination.', 'woocommerce' ),
 		) ) );
 
 		wp_localize_script( 'wc-country-select', 'wc_country_select_params', apply_filters( 'wc_country_select_params', array(

includes/class-wc-product-variable.php

@@ -286,17 +286,20 @@ class WC_Product_Variable extends WC_Product {
 
             foreach ( $this->get_children() as $child_id ) {
 
-                if ( get_post_status( $child_id ) != 'publish' )
+            	$variation = $this->get_child( $child_id );
-                	continue; // Disabled
 
-            	$child = $this->get_child( $child_id );
+				if ( ! empty( $variation->variation_id ) ) {
 
-                $child_variation_attributes = $child->get_variation_attributes();
+					if ( ! $variation->variation_is_visible() )
+						continue; // Disabled or hidden
+
+					$child_variation_attributes = $variation->get_variation_attributes();
 
 	                foreach ( $child_variation_attributes as $name => $value )
 	                    if ( $name == $attribute_field_name )
 	                    	$values[] = sanitize_title( $value );
                 }
+            }
 
             // empty value indicates that all options for given attribute are available
             if ( in_array( '', $values ) ) {
@@ -361,10 +364,6 @@ class WC_Product_Variable extends WC_Product {
 			$variation = $this->get_child( $child_id );
 
 			if ( ! empty( $variation->variation_id ) ) {
-
-				if ( ! $variation->variation_is_visible() )
-					continue; // Disabled or hidden
-
 				$variation_attributes 	= $variation->get_variation_attributes();
 				$availability 			= $variation->get_availability();
 				$availability_html 		= empty( $availability['availability'] ) ? '' : apply_filters( 'woocommerce_stock_html', '<p class="stock ' . esc_attr( $availability['class'] ) . '">'. wp_kses_post( $availability['availability'] ).'</p>', wp_kses_post( $availability['availability'] ) );
@@ -386,6 +385,7 @@ class WC_Product_Variable extends WC_Product {
 
 				$available_variations[] = apply_filters( 'woocommerce_available_variation', array(
 					'variation_id'         => $child_id,
+					'variation_is_visible' => $variation->variation_is_visible(),
 					'attributes'           => $variation_attributes,
 					'image_src'            => $image,
 					'image_link'           => $image_link,

includes/class-wc-product-variation.php

@@ -221,7 +221,7 @@ class WC_Product_Variation extends WC_Product {
 	public function variation_is_visible() {
 		$visible = true;
 
-		// Published
+		// Published == enabled checkbox
 		if ( get_post_status( $this->variation_id ) != 'publish' )
 			$visible = false;
 
@@ -236,6 +236,24 @@ class WC_Product_Variation extends WC_Product {
 		return apply_filters( 'woocommerce_variation_is_visible', $visible, $this->variation_id, $this->id );
 	}
 
+	/**
+	 * Returns false if the product cannot be bought.
+	 *
+	 * @access public
+	 * @return cool
+	 */
+	public function is_purchasable() {
+
+		// Published == enabled checkbox
+		if ( get_post_status( $this->variation_id ) != 'publish' )
+			$purchasable = false;
+
+		else
+			$purchasable = parent::is_purchasable();
+
+		return $purchasable;
+	}
+
 	/**
 	 * Returns whether or not the variations parent is visible.
 	 *