How to add variation stock status to Woocommerce product variation dropdown

Question

I would like to show the stock status (eg. In Stock / Out of Stock) for each product variation shown in the drop down list of variations on the Woocommerce Product Page. I have copied the relevant function to my theme's functions.php file, and can edit the content, but am unsure how to pull out the required stock status for each variation.

// Updated Woocommerce Product Variation Select 

if ( ! function_exists( 'wc_dropdown_variation_attribute_options' ) ) {

    /**
     * Output a list of variation attributes for use in the cart forms.
     *
     * @param array $args
     * @since 2.4.0
     */

     /*

    function wc_dropdown_variation_attribute_options( $args = array() ) {
        $args = wp_parse_args( apply_filters( 'woocommerce_dropdown_variation_attribute_options_args', $args ), array(
            'options'          => false,
            'attribute'        => false,
            'product'          => false,
            'selected'         => false,
            'name'             => '',
            'id'               => '',
            'class'            => '',
            'show_option_none' => __( 'Choose an option', 'woocommerce' ),
        ) );

        $options               = $args['options'];
        $product               = $args['product'];
        $attribute             = $args['attribute'];
        $name                  = $args['name'] ? $args['name'] : 'attribute_' . sanitize_title( $attribute );
        $id                    = $args['id'] ? $args['id'] : sanitize_title( $attribute );
        $class                 = $args['class'];
        $show_option_none      = $args['show_option_none'] ? true : false;
        $show_option_none_text = $args['show_option_none'] ? $args['show_option_none'] : __( 'Choose an option', 'woocommerce' ); // We'll do our best to hide the placeholder, but we'll need to show something when resetting options.

        if ( empty( $options ) && ! empty( $product ) && ! empty( $attribute ) ) {
            $attributes = $product->get_variation_attributes();
            $options    = $attributes[ $attribute ];
        }

        $html = '';
        $html .= '' . esc_html( $show_option_none_text ) . '';

        if ( ! empty( $options ) ) {
            if ( $product && taxonomy_exists( $attribute ) ) {
                // Get terms if this is a taxonomy - ordered. We need the names too.
                $terms = wc_get_product_terms( $product->get_id(), $attribute, array( 'fields' => 'all' ) );



                foreach ( $terms as $term ) {
                    if ( in_array( $term->slug, $options ) ) {
                        $html .= 'slug ) . '" ' . selected( sanitize_title( $args['selected'] ), $term->slug, false ) . '>' . esc_html( apply_filters( 'woocommerce_variation_option_name', $term->name ) ) . ' ';
                    }
                }
            } else {
                foreach ( $options as $option ) {
                    // This handles lt 2.4.0 bw compatibility where text attributes were not sanitized.
                    $selected = sanitize_title( $args['selected'] ) === $args['selected'] ? selected( $args['selected'], sanitize_title( $option ), false ) : selected( $args['selected'], $option, false );

                    $html .= '' . esc_html( apply_filters( 'woocommerce_variation_option_name', $option ) ) . '  Output Stock Details Here ';
                }
            }
        }

        $html .= '';

        echo apply_filters( 'woocommerce_dropdown_variation_attribute_options_html', $html, $args );
    }
}

I can pull out the stock level for the overall product, but now for each variation.

Any help would be greatly appreciated.

Answer 1

Update 2021 (Only for variable products with 1 dropdown) - thanks to @Alex Banks

Anyway this will really work when there is ONLY ONE dropdown select field (so one attribute for the variations).

With multiple attributes (so multiple dropdown select fields) it displays something that can be wrong depending on the variations stock status attributes terms combination.

See the screenshot at the end that shows a wrong display case…

I have tried the code of Ali_k, but it was not working in my test server when variable products have multiple dropdowns.

So I have made some changes to the Ali_k's code to get this working in my test server (with last WooCommerce version).

To handle backorders see: Add backorders stock status to Woocommerce variable product dropdown

The code:

// Function that will check the stock status and display the corresponding additional text
function get_stock_status_text( $product, $name, $term_slug ){
    foreach ( $product->get_available_variations() as $variation ){
        if($variation['attributes'][$name] == $term_slug ) {
            $stock = $variation['is_in_stock'];
            break;
        }
    }
    return $stock == 1 ? ' - (In Stock)' : ' - (Out of Stock)';
}

// The hooked function that will add the stock status to the dropdown options elements.
add_filter( 'woocommerce_dropdown_variation_attribute_options_html', 'show_stock_status_in_dropdown', 10, 2);
function show_stock_status_in_dropdown( $html, $args ) {
    // Only if there is a unique variation attribute (one dropdown)
    if( sizeof($args['product']->get_variation_attributes()) == 1 ) :

    $options               = $args['options'];
    $product               = $args['product'];
    $attribute             = $args['attribute']; // The product attribute taxonomy
    $name                  = $args['name'] ? $args['name'] : 'attribute_' . sanitize_title( $attribute );
    $id                    = $args['id'] ? $args['id'] : sanitize_title( $attribute );
    $class                 = $args['class'];
    $show_option_none      = $args['show_option_none'] ? true : false;
    $show_option_none_text = $args['show_option_none'] ? $args['show_option_none'] : __( 'Choose an option', 'woocommerce' );

    if ( empty( $options ) && ! empty( $product ) && ! empty( $attribute ) ) {
        $attributes = $product->get_variation_attributes();
        $options    = $attributes[ $attribute ];
    }

    $html = '<select id="' . esc_attr( $id ) . '" class="' . esc_attr( $class ) . '" name="' . esc_attr( $name ) . '" data-attribute_name="attribute_' . esc_attr( sanitize_title( $attribute ) ) . '" data-show_option_none="' . ( $show_option_none ? 'yes' : 'no' ) . '">';
    $html .= '<option value="">' . esc_html( $show_option_none_text ) . '</option>';

    if ( ! empty( $options ) ) {
        if ( $product && taxonomy_exists( $attribute ) ) {
            $terms = wc_get_product_terms( $product->get_id(), $attribute, array( 'fields' => 'all' ) );

            foreach ( $terms as $term ) {
                if ( in_array( $term->slug, $options ) ) {
                    // HERE Added the function to get the text status
                    $stock_status = get_stock_status_text( $product, $name, $term->slug );
                    $html .= '<option value="' . esc_attr( $term->slug ) . '" ' . selected( sanitize_title( $args['selected'] ), $term->slug, false ) . '>' . esc_html( apply_filters( 'woocommerce_variation_option_name', $term->name ) . $stock_status ) . '</option>';
                }
            }
        } else {
            foreach ( $options as $option ) {
                $selected = sanitize_title( $args['selected'] ) === $args['selected'] ? selected( $args['selected'], sanitize_title( $option ), false ) : selected( $args['selected'], $option, false );
                // HERE Added the function to get the text status
                $stock_status = get_stock_status_text( $product, $name, $option );
                $html .= '<option value="' . esc_attr( $option ) . '" ' . $selected . '>' . esc_html( apply_filters( 'woocommerce_variation_option_name', $option ) . $stock_status ) . '</option>';
            }
        }
    }
    $html .= '</select>';

    endif;

    return $html;
}

Code goes in function.php file of your active child theme (or theme) or also in any plugin file.

Tested and work in variable products that have only one attribute for variations…

---

With the code of Ali_K, Here an example of a wrong displayed text for a variable product with multiple select fields (so multiple attributes for variations):

Answer 2

Ok, first you'll need to get product variations like this:

$variations = $product->get_available_variations();

And inside options loop, you need to loop through the variations and find the current option stock status

foreach ($variations as $variation) {
    if($variation['attributes'][$name] == $option) {
        $stock = $variation['is_in_stock'];

    }
}

Outside the variations loop you need to add the wording for in-stock and out-of-stock variations

if( $stock == 1) {
    $stock_content = ' - In stock';
} else {
    $stock_content = ' - Out of stock';
}

Then change the html to include an additional variable ($stock_content)

$html .= '<option value="' . esc_attr( $option ) . '" ' . $selected . '>' . esc_html( $option  .  $stock_content ) . '</option>'; 

So a complete function will look like this:

add_filter( 'woocommerce_dropdown_variation_attribute_options_html', 'show_stock_status_in_dropdown', 10, 2);
function show_stock_status_in_dropdown( $html, $args ) {
    $options = $args['options']; 
    $product = $args['product']; 
    $attribute = $args['attribute']; 
    $name = $args['name'] ? $args['name'] : 'attribute_' . sanitize_title( $attribute ); 
    $id = $args['id'] ? $args['id'] : sanitize_title( $attribute ); 
    $class = $args['class']; 
    $show_option_none = $args['show_option_none'] ? true : false; 
    $show_option_none_text = $args['show_option_none'] ? $args['show_option_none'] : __( 'Choose an option', 'woocommerce' ); 

  // Get all product variations
    $variations = $product->get_available_variations();

    if ( empty( $options ) && ! empty( $product ) && ! empty( $attribute ) ) { 
        $attributes = $product->get_variation_attributes(); 
        $options = $attributes[ $attribute ]; 
    } 

    $html = '<select id="' . esc_attr( $id ) . '" class="' . esc_attr( $class ) . '" name="' . esc_attr( $name ) . '" data-attribute_name="attribute_' . esc_attr( sanitize_title( $attribute ) ) . '" data-show_option_none="' . ( $show_option_none ? 'yes' : 'no' ) . '">'; 
    $html .= '<option value="">' . esc_html( $show_option_none_text ) . '</option>'; 

    if ( ! empty( $options ) ) { 
        if ( $product && taxonomy_exists( $attribute ) ) { 
          // Get terms if this is a taxonomy - ordered. We need the names too. 
          $terms = wc_get_product_terms( $product->get_id(), $attribute, array( 'fields' => 'all' ) ); 

          foreach ( $terms as $term ) { 
                if ( in_array( $term->slug, $options ) ) { 
                    $html .= '<option value="' . esc_attr( $term->slug ) . '" ' . selected( sanitize_title( $args['selected'] ), $term->slug, false ) . '>' . esc_html( apply_filters( 'woocommerce_variation_option_name', $term->name ) ) . '</option>'; 
                } 
            }
        } else {
            foreach ( $options as $option ) {
                    foreach ($variations as $variation) {
                        if($variation['attributes'][$name] == $option) {
                            $stock = $variation['is_in_stock'];
                        }
                    }       
                if( $stock == 1) {
                    $stock_content = ' - (In Stock)';
                } else {
                    $stock_content = ' - (Out of Stock)';
                }
                 // This handles < 2.4.0 bw compatibility where text attributes were not sanitized. 
                $selected = sanitize_title( $args['selected'] ) === $args['selected'] ? selected( $args['selected'], sanitize_title( $option ), false ) : selected( $args['selected'], $option, false ); 

                $html .= '<option value="' . esc_attr( $option ) . '" ' . $selected . '>' . esc_html( $option  .  $stock_content ) . '</option>'; 

            }
        } 
    } 

    $html .= '</select>'; 

    return $html;
}