Initial commit

les-variations-js-free.php

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+<?php
+/**
+* WooCommerce Variations Add to Cart JS-free
+* Determines the variation ID for the user's chosen attributes on variable items server-side, so that users can shop without Javascript enabled.
+* @author Jacob Eva, Liberated Embedded Systems, liberatedsystems.co.uk
+* @version 1
+*/
+
+
+/*
+Plugin Name: LES Variations Add-to-Cart JS-free
+Plugin URI: https://git.liberatedsystems.co.uk
+Description: This plugin determines the variation ID for a product from the server side, allowing users to shop without Javascript enabled. Inspiration taken from eggplant studios' variations add to cart plugin (www.eggplantstudios.ca).
+Version: 1.0.0
+Author: Jacob Eva
+License: GPLv2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+*/
+
+/* 
+ * Get variation ID function, uses an array of the attributes to construct an
+ * SQL query that can determine the correct variation ID to return, so that the
+ * product can be added to the user's cart
+*/
+function get_variation_id( $attributes, $product_id ) {
+    global $wpdb;
+
+    $select_from_sql = "
+        SELECT p.ID
+        FROM {$wpdb->prefix}posts as p
+    ";
+
+    $join_sql = "
+        JOIN {$wpdb->prefix}postmeta as pm ON p.ID = pm.post_id
+    ";
+
+    $where_sql = "
+        WHERE pm.meta_key = %s
+        AND pm.meta_value LIKE %s
+    ";
+
+    $parent_sql = "
+        AND p.post_parent = %s
+    ";
+
+    // add additional attributes to JOIN if there are more than 1
+    for ( $x = 2; $x < count( array_keys($attributes) ) + 1; $x++ ) {
+        $join_sql = $join_sql . "
+        JOIN {$wpdb->prefix}postmeta as pm{$x} ON p.ID = pm{$x}.post_id
+        ";
+    }
+
+    // add additional attributes to AND section if there are more than 1
+    for ( $x = 2; $x < count( array_keys($attributes) ) + 1; $x++ ) {
+        $where_sql = $where_sql . "
+        AND pm{$x}.meta_key = %s
+        AND pm{$x}.meta_value LIKE %s
+        ";
+    }
+    
+    // merge attribute arrays into one for use in prepared statement
+    $parameters = array();
+
+    for ( $x = 0; $x < count ( array_keys($attributes) ); $x++ ) {
+        $parameters[] = array_keys($attributes)[$x];
+        $parameters[] = array_values($attributes)[$x];
+    }
+    $parameters[] = $product_id;
+
+    $sql = $select_from_sql . $join_sql . $where_sql . $parent_sql;
+
+    return $wpdb->get_var($wpdb->prepare($sql, $parameters));
+}
+
+
+add_filter( 'woocommerce_add_to_cart_handler', 'les_add_to_cart_handler');
+/*
+ * Override function to change type of variable product, so custom function is
+ * called to handle it 
+*/
+function les_add_to_cart_handler( $type ) {
+    if ( $type === "variable" || $type === "variation" ) {
+        return "les_variation";
+    }
+    else {
+        return $type;
+    }
+}
+
+add_action( 'woocommerce_add_to_cart_handler_les_variation', 'les_add_variation_to_cart', 10, 2 );
+/* 
+ * Add to cart function, created to allow shopping without JS
+*/
+function les_add_variation_to_cart() {
+    global $woocommerce;
+    $added_products = 0;
+
+    $product_id = (int) $_POST['product_id'];
+
+    $quantity = (int) $_POST['quantity'];
+
+    $product = wc_get_product( $product_id );
+
+    // do nothing if attributes were not sent
+    $attributes_valid = false;
+
+    // if the user has JS enabled and / or has already set the variation ID
+    // themselves
+    if ( ! empty( $_POST['variation_id'] ) ) {
+        $variation_id = $_POST['variation_id'];
+    }
+
+    else {
+        // create array with all attribute keys
+        $attributes = array();
+        $attr_exp = "/attribute.+/";
+        foreach (array_keys($_POST) as $field)
+        {
+            if ( preg_match($attr_exp, $field) ) {
+                $attributes[$field] = $_POST[$field];
+            }
+        }
+
+
+        // if there are attributes, process them to get the variation id
+        if ( ! empty( $attributes ) ) {
+            $variation_id = get_variation_id( $attributes, $product_id );
+        }
+    }
+
+    $passed_validation = apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity, $variation_id, $attributes );
+
+    if ( ! $passed_validation ) {
+        return false;
+    }
+
+    if( (int) $_POST['quantity'] > 0 ) {
+        // if no variation id was found for product
+        if ( empty( $variation_id ) ) {
+            /* translators: 1: product link, 2: product name */
+            wc_add_notice( sprintf( __( 'Please choose product options by visiting <a href="%1$s" title="%2$s">%2$s</a>.', 'woocommerce' ), esc_url( get_permalink( $product_id ) ), esc_html( $product->get_name() ) ), 'error' );
+            return false;
+        }
+        else {
+            $added_to_cart = $woocommerce->cart->add_to_cart(
+                    $_POST['product_id'],   // string $product_id
+                    $_POST['quantity'],     // string $quantity = 1
+                    (int) $variation_id,    // integer $variation_id = ''
+                    false // no attributes
+            );
+            $added_products ++;
+
+            if ( $added_to_cart ) { 
+                wp_safe_redirect( wc_get_cart_url() );
+            }
+            return $added_to_cart;
+        }
+    }
+}