Add text to variation options

This won’t work for all configs because red could apply to both in stock and out of stock variations.

E.g. red large in stock
red small out of stock

Thanks for the reply, Mike. The majority of my products only have one attribute. In fact, my WC 2.3 install has this feature working, but the WC 2.4 variable.php file has changed quite a bit.

I’m not as comfortable overriding wc-template-functions.php as I am variable.php (although I am willing to do so if it is the only way). Is there a way to check the stock of the variable then filter the option value?

I’m not sure the best way to go around it. What code did you use previously?

Here is what was in my variable.php:

<table class="variations" cellspacing="0">
<tbody>
	<?php foreach ( $attributes as $attribute_name => $options ) : ?>
		<tr>
			<td class="label"><label for="<?php echo sanitize_title( $attribute_name ); ?>"><?php echo wc_attribute_label( $attribute_name ); ?></label></td>
			<td class="value"><select id="<?php echo esc_attr( sanitize_title( $attribute_name ) ); ?>" name="attribute_<?php echo sanitize_title( $attribute_name ); ?>" data-attribute_name="attribute_<?php echo sanitize_title( $attribute_name ); ?>">
				<option value="">Choose your <?php echo __( wc_attribute_label( $attribute_name ), 'woocommerce' ) ?>&hellip;</option>
				<?php
					if ( is_array( $options ) ) {

						if ( isset( $_REQUEST[ 'attribute_' . sanitize_title( $attribute_name ) ] ) ) {
							$selected_value = $_REQUEST[ 'attribute_' . sanitize_title( $attribute_name ) ];
						} elseif ( isset( $selected_attributes[ sanitize_title( $attribute_name ) ] ) ) {
							$selected_value = $selected_attributes[ sanitize_title( $attribute_name ) ];
						} else {
							$selected_value = '';
						}

						// Get terms if this is a taxonomy - ordered
						if ( taxonomy_exists( $attribute_name ) ) {

							$terms = wc_get_product_terms( $post->ID, $attribute_name, array( 'fields' => 'all' ) );

							// ============== BEGIN CUSTOM CODE ===================
							$variations = $product->get_available_variations();

							foreach ($variations as $variation)
							{
								$variation_data[$variation['attributes']['attribute_pa_size']] = $variation['variation_id'];
							}
							ksort( $variation_data ); //Sort by Key (eu-36, etc...)
							$variation_data = array_values( $variation_data ); //Removes Array Keys, [leaving variation_id]

							$i = 0;
							foreach ( $terms as $term ) {
								if ( ! in_array( $term->slug, $options ) ) {
									continue;
								}
								$waitlist = '';
								$variation_product_id = $variation_data[$i];
								$variation_product = new WC_Product_Variation( $variation_product_id );
								if ($variation_product->get_stock_quantity() <= 0) {
									$waitlist = ' - Out of Stock';
								}
								$i++;

								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 ) . $waitlist . '</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>

For that level of customisation, you’re going to have either override https://github.com/woothemes/woocommerce/blob/master/includes/wc-template-functions.php#L1906, or try to do the above with javascript instead on display.