将"Show Single Variation"代码添加到函数中时出错.php

Question

在wooCommerce中，我正在尝试在我的Active themy的function.php文件中添加一些自定义代码，这将使可变产品显示属性下拉列表，数量字段和添加到商店和档案页面上的购物车按钮。

这是我的实际代码：

// Display variations dropdowns on shop page for variable products
add_filter( 'woocommerce_loop_add_to_cart_link', 'woo_display_variation_dropdown_on_shop_page' );
function woo_display_variation_dropdown_on_shop_page() {
    global $product;
    if( $product->is_type( 'variable' )) {
        $attribute_keys = array_keys( $product->get_attributes() );
        ?>
        <form class="variations_form cart" method="post" enctype='multipart/form-data' data-product_id="<?php echo absint( $product->id ); ?>" data-product_variations="<?php echo htmlspecialchars( json_encode( $product->get_available_variations() ) ) ?>">
            <?php do_action( 'woocommerce_before_variations_form' ); ?>
            <?php if ( empty( $product->get_available_variations() ) && false !== $product->get_available_variations() ) : ?>
                <p class="stock out-of-stock"><?php _e( 'This product is currently out of stock and unavailable.', 'woocommerce' ); ?></p>
            <?php else : ?>
                <table class="variations" cellspacing="0">
                    <tbody>
                        <?php foreach ( $product->get_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">
                                    <?php
                                        $selected = isset( $_REQUEST[ 'attribute_' . sanitize_title( $attribute_name ) ] ) ? wc_clean( urldecode( $_REQUEST[ 'attribute_' . sanitize_title( $attribute_name ) ] ) ) : $product->get_variation_default_attribute( $attribute_name );
                                        wc_dropdown_variation_attribute_options( array( 'options' => $options, 'attribute' => $attribute_name, 'product' => $product, 'selected' => $selected ) );
                                        echo end( $attribute_keys ) === $attribute_name ? apply_filters( 'woocommerce_reset_variations_link', '<a class="reset_variations" href="#">' . __( 'Clear', 'woocommerce' ) . '</a>' ) : '';
                                    ?>
                                </td>
                            </tr>
                        <?php endforeach;?>
                    </tbody>
                </table>
                <?php do_action( 'woocommerce_before_add_to_cart_button' ); ?>
                <div class="single_variation_wrap">
                    <?php
                        /**
                         * woocommerce_before_single_variation Hook.
                         */
                        do_action( 'woocommerce_before_single_variation' );
                        /**
                         * woocommerce_single_variation hook. Used to output the cart button and placeholder for variation data.
                         * @since 2.4.0
                         * @hooked woocommerce_single_variation - 10 Empty div for variation data.
                         * @hooked woocommerce_single_variation_add_to_cart_button - 20 Qty and cart button.
                         */
                        do_action( 'woocommerce_single_variation' );
                        /**
                         * woocommerce_after_single_variation Hook.
                         */
                        do_action( 'woocommerce_after_single_variation' );
                    ?>
                </div>
                <?php do_action( 'woocommerce_after_add_to_cart_button' ); ?>
            <?php endif; ?>
            <?php do_action( 'woocommerce_after_variations_form' ); ?>
        </form>
        <?php } else {
        echo sprintf( '<a rel="nofollow" href="%s" data-quantity="%s" data-product_id="%s" data-product_sku="%s" class="%s">%s</a>',
            esc_url( $product->add_to_cart_url() ),
            esc_attr( isset( $quantity ) ? $quantity : 1 ),
            esc_attr( $product->id ),
            esc_attr( $product->get_sku() ),
            esc_attr( isset( $class ) ? $class : 'button' ),
            esc_html( $product->add_to_cart_text() )
        );
    }
} 

但是，以下错误被抛出并遇到问题：

由于文件WP-CONTENT/插件/wooCommerce-Composite-Products/include/wc-cp-template-functions.php的第666行上的错误，您的PHP代码更改被撤回。请修复并尝试再次保存。

未被发现的错误：
中的null上的成员函数get_type() wp-content/plugins/woocommerce-composite-products/includes/wc-cp-template-functions.php:666
堆栈跟踪：
＃0 wp-includes/class-wp-hook.php(286(： wc_cp_before_add_to_cart_button('')
＃1 wp-includes/class-wp-hook.php(310(： WP_Hook->apply_filters('', Array)
＃2 wp-includes/plugin.php(465(： WP_Hook->do_action(Array)
＃3 WP-CONTENT/主题/Electro-Child/functions.php(2228(：do_action('woocommerce_bef...')
＃4 wp-includes/class-wp-hook.php(288(： woo_display_variation_dropdown_on_shop_page('<a href="https:...')
＃5 wp-includes/plugin.php(208(： WP_Hook->apply_filters('<a href="https:...', Array)
＃6 wp-content/plugins/woocommerce/templates/loop/add

我认为与我正在使用的复合产品插件有冲突。

任何帮助都非常感谢。

Answer 1

代码中最大的错误是，您只是忘记了使用过滤器钩，在这种情况下，您需要返回输出，但不要回声。

然后，您将使用此滤镜中包含的钩子参数。

您也只需要才能更改可变产品的行为，因为，使用您的实际代码，因为您还使用WooCommerce Composite产品插件，它会给您提供报告的错误。p>因此，请尝试使用类似(未经测试(的东西：

// Display variations dropdowns on shop page for variable products
add_filter( 'woocommerce_loop_add_to_cart_link', 'woo_display_variation_dropdown_on_shop_page', 10, 3 );
function woo_display_variation_dropdown_on_shop_page( $add_to_cart_link, $product, $args ) {
    if( $product->is_type('variable') ) {
        $attribute_keys = array_keys( $product->get_attributes() );
        ob_start(); // Start buffering
        ?>
        <form class="variations_form cart" method="post" enctype='multipart/form-data' data-product_id="<?php echo absint( $product->id ); ?>" data-product_variations="<?php echo htmlspecialchars( json_encode( $product->get_available_variations() ) ) ?>">
            <?php do_action( 'woocommerce_before_variations_form' ); ?>
            <?php if ( empty( $product->get_available_variations() ) && false !== $product->get_available_variations() ) : ?>
                <p class="stock out-of-stock"><?php _e( 'This product is currently out of stock and unavailable.', 'woocommerce' ); ?></p>
            <?php else : ?>
                <table class="variations" cellspacing="0">
                    <tbody>
                        <?php foreach ( $product->get_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">
                                    <?php
                                        $selected = isset( $_REQUEST[ 'attribute_' . sanitize_title( $attribute_name ) ] ) ? wc_clean( urldecode( $_REQUEST[ 'attribute_' . sanitize_title( $attribute_name ) ] ) ) : $product->get_variation_default_attribute( $attribute_name );
                                        wc_dropdown_variation_attribute_options( array( 'options' => $options, 'attribute' => $attribute_name, 'product' => $product, 'selected' => $selected ) );
                                        echo end( $attribute_keys ) === $attribute_name ? apply_filters( 'woocommerce_reset_variations_link', '<a class="reset_variations" href="#">' . __( 'Clear', 'woocommerce' ) . '</a>' ) : '';
                                    ?>
                                </td>
                            </tr>
                        <?php endforeach;?>
                    </tbody>
                </table>
                <?php do_action( 'woocommerce_before_add_to_cart_button' ); ?>
                <div class="single_variation_wrap">
                    <?php
                        /**
                         * woocommerce_before_single_variation Hook.
                         */
                        do_action( 'woocommerce_before_single_variation' );
                        /**
                         * woocommerce_single_variation hook. Used to output the cart button and placeholder for variation data.
                         * @since 2.4.0
                         * @hooked woocommerce_single_variation - 10 Empty div for variation data.
                         * @hooked woocommerce_single_variation_add_to_cart_button - 20 Qty and cart button.
                         */
                        do_action( 'woocommerce_single_variation' );
                        /**
                         * woocommerce_after_single_variation Hook.
                         */
                        do_action( 'woocommerce_after_single_variation' );
                    ?>
                </div>
                <?php do_action( 'woocommerce_after_add_to_cart_button' ); ?>
            <?php endif; ?>
            <?php do_action( 'woocommerce_after_variations_form' ); ?>
        </form> 
        <?php
        $add_to_cart_link = ob_get_clean(); // The buffered content
    }
    return $add_to_cart_link;
}