JezK

Edit File: advaxe-buy-now.php

<?php
/*
Plugin Name: Buy Now Button for WooCommerce
Plugin URI: https://advaxe.com
Description: Redirects to checkout with the selected product when clicking "Buy Now". Variable products open their single product page for option selection.
Version: 1.0.2
Author: Advaxe
Author URI: https://advaxe.com
*/

if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly.
}

class BuyNowButtonPlugin {

public function __construct() {
        // Admin menu and settings
        add_action('admin_menu', [ $this, 'add_plugin_menu' ]);
        add_action('admin_init', [ $this, 'register_plugin_settings' ]);

// Add Buy Now button to shop and product pages
        add_action('woocommerce_after_shop_loop_item', [ $this, 'add_buy_now_button' ], 15);
        add_action('woocommerce_single_product_summary', [ $this, 'add_buy_now_button_single' ], 30);

// Enqueue styles
        add_action('wp_enqueue_scripts', [ $this, 'enqueue_styles' ]);

// Handle Buy Now action
        add_action('template_redirect', [ $this, 'handle_buy_now_action' ]);
    }

// Enqueue custom styles
    public function enqueue_styles() {
        wp_enqueue_style('buy-now-button-style', plugins_url('style.css', __FILE__));
    }

// Add Buy Now button to shop/archive pages
    public function add_buy_now_button() {
        global $product;

$button_text = esc_html(get_option('buy_now_button_text', 'Buy Now'));

if ( $product->is_type('variable') ) {
            // For variable products, go to product page
            $url = $product->get_permalink();
        } else {
            // For simple products, go directly to checkout
            $url = add_query_arg('buy_now', $product->get_id(), home_url());
        }

echo '<a href="' . esc_url($url) . '" class="buy-now-button">' . $button_text . '</a>';
    }

// Add Buy Now button to single product pages
    public function add_buy_now_button_single() {
        if (!get_option('buy_now_show_single_product', true)) {
            return;
        }

global $product;

$button_text = esc_html(get_option('buy_now_button_text', 'Buy Now'));

if ( $product->is_type('variable') ) {
            // Variable product: Let WooCommerce handle variation selection
            echo '<button type="submit" name="buy_now_single" value="1" class="buy-now-button">' . $button_text . '</button>';
            // JS to change form action for variable products
            add_action('wp_footer', function() {
                if (is_product()) {
                    ?>
                    <script>
                        document.addEventListener('DOMContentLoaded', function(){
                            const buyNowBtn = document.querySelector('button[name="buy_now_single"]');
                            if(buyNowBtn){
                                buyNowBtn.addEventListener('click', function(){
                                    const form = buyNowBtn.closest('form.cart');
                                    if(form){
                                        const action = '<?php echo esc_url(wc_get_checkout_url()); ?>';
                                        form.insertAdjacentHTML('beforeend','<input type="hidden" name="is_buy_now" value="1">');
                                        form.setAttribute('action', action);
                                    }
                                });
                            }
                        });
                    </script>
                    <?php
                }
            });
        } else {
            // Simple product: Direct to checkout
            $url = add_query_arg('buy_now', $product->get_id(), home_url());
            echo '<a href="' . esc_url($url) . '" class="buy-now-button">' . $button_text . '</a>';
        }
    }

// Handle Buy Now redirect for simple products
    public function handle_buy_now_action() {
        if (isset($_GET['buy_now']) && is_numeric($_GET['buy_now'])) {
            $product_id = intval($_GET['buy_now']);

if (wc_get_product($product_id)) {
                WC()->cart->empty_cart();
                WC()->cart->add_to_cart($product_id);
                wp_safe_redirect(wc_get_checkout_url());
                exit;
            }
        }

// For variable products when coming from single product page
        if (isset($_POST['is_buy_now']) && $_POST['is_buy_now'] == '1' && isset($_POST['add-to-cart'])) {
            WC()->cart->empty_cart();
        }
    }

// Add admin menu
    public function add_plugin_menu() {
        add_menu_page(
            'Buy Now Settings',
            'Buy Now Button',
            'manage_options',
            'buy-now-settings',
            [ $this, 'plugin_settings_page' ],
            'dashicons-cart'
        );
    }

// Register settings
    public function register_plugin_settings() {
        register_setting('buy_now_settings_group', 'buy_now_button_padding');
        register_setting('buy_now_settings_group', 'buy_now_button_text_size');
        register_setting('buy_now_settings_group', 'buy_now_button_color');
        register_setting('buy_now_settings_group', 'buy_now_button_text_color');
        register_setting('buy_now_settings_group', 'buy_now_button_text');
        register_setting('buy_now_settings_group', 'buy_now_button_margin');
        register_setting('buy_now_settings_group', 'buy_now_show_single_product');
    }

// Plugin settings page
    public function plugin_settings_page() {
        ?>
        <div class="wrap">
            <h1>Buy Now Button Settings</h1>
            <form method="post" action="options.php">
                <?php settings_fields('buy_now_settings_group'); ?>
                <?php do_settings_sections('buy_now_settings_group'); ?>

<table class="form-table">
                    <tr valign="top">
                        <th scope="row">Button Text</th>
                        <td><input type="text" name="buy_now_button_text" value="<?php echo esc_attr(get_option('buy_now_button_text', 'Buy Now')); ?>" /></td>
                    </tr>
                    <tr valign="top">
                        <th scope="row">Button Padding</th>
                        <td><input type="text" name="buy_now_button_padding" value="<?php echo esc_attr(get_option('buy_now_button_padding', '10px 20px')); ?>" /></td>
                    </tr>
                    <tr valign="top">
                        <th scope="row">Button Margin</th>
                        <td><input type="text" name="buy_now_button_margin" value="<?php echo esc_attr(get_option('buy_now_button_margin', '10px 0')); ?>" /></td>
                    </tr>
                    <tr valign="top">
                        <th scope="row">Text Size</th>
                        <td><input type="text" name="buy_now_button_text_size" value="<?php echo esc_attr(get_option('buy_now_button_text_size', '16px')); ?>" /></td>
                    </tr>
                    <tr valign="top">
                        <th scope="row">Button Color</th>
                        <td><input type="color" name="buy_now_button_color" value="<?php echo esc_attr(get_option('buy_now_button_color', '#000000')); ?>" /></td>
                    </tr>
                    <tr valign="top">
                        <th scope="row">Button Text Color</th>
                        <td><input type="color" name="buy_now_button_text_color" value="<?php echo esc_attr(get_option('buy_now_button_text_color', '#ffffff')); ?>" /></td>
                    </tr>
                    <tr valign="top">
                        <th scope="row">Show on Single Product Page</th>
                        <td>
                            <input type="checkbox" name="buy_now_show_single_product" value="1" <?php checked(get_option('buy_now_show_single_product', true)); ?> />
                            Enable
                        </td>
                    </tr>
                </table>

<?php submit_button(); ?>
            </form>
        </div>
        <?php
    }
}

new BuyNowButtonPlugin();

// Inline styles
add_action('wp_head', function() {
    $padding = esc_attr(get_option('buy_now_button_padding', '10px 20px'));
    $margin = esc_attr(get_option('buy_now_button_margin', '10px 0'));
    $text_size = esc_attr(get_option('buy_now_button_text_size', '16px'));
    $color = esc_attr(get_option('buy_now_button_color', '#000000'));
    $text_color = esc_attr(get_option('buy_now_button_text_color', '#ffffff'));

echo "<style>
        .buy-now-button {
            padding: {$padding} !important;
            margin: {$margin} !important;
            font-size: {$text_size} !important;
            background-color: {$color} !important;
            color: {$text_color} !important;
            text-decoration: none !important;
            border: none;
            border-radius: 5px;
            display: inline-block;
            text-align: center;
            cursor: pointer;
        }
        .buy-now-button:hover {
            opacity: 0.85;
        }
    </style>";
});