当用户单击“添加到购物车”按钮时，我正在寻找解决方案
我已经有了一些代码，但我收到了一个关键的错误，在我的WordPress块，只是需要一些指导，它可能是什么。
代码在前端工作得很好，但是当我试图在wordpress中编辑一个页面时，手工挑选的产品块表示有一个错误。
调试时，错误状态为：
[21-Oct-2020 12:20:04 UTC] PHP Fatal error: Uncaught Error: Call to a member function find_product_in_cart() on null in /home4/metis/public_html/staging/4326/wp-content/plugins/code-snippets/php/snippet-ops.php(446) : eval()'d code:4
Stack trace:
#0 /home4/metis/public_html/staging/4326/wp-includes/class-wp-hook.php(287): redirect_product_exist_in_cart('?add-to-cart=43...', Object(WC_Product_Simple))
#1 /home4/metis/public_html/staging/4326/wp-includes/plugin.php(206): WP_Hook->apply_filters('?add-to-cart=43...', Array)
#2 /home4/metis/public_html/staging/4326/wp-content/plugins/woocommerce/includes/class-wc-product-simple.php(51): apply_filters('woocommerce_pro...', '?add-to-cart=43...', Object(WC_Product_Simple))
#3 /home4/metis/public_html/staging/4326/wp-content/plugins/woo-gutenberg-products-block/src/BlockTypes/AbstractProductGrid.php(471): WC_Product_Simple->add_to_cart_url()
#4 /home4/metis/public_html/staging/4326/wp-content/plugins/woo-gutenberg-products-block/src/BlockTypes/AbstractProductGrid.php(446): Automattic\WooCommer in /home4/metis/public_html/staging/4326/wp-content/plugins/code-snippets/php/snippet-ops.php(446) : eval()'d code on line 4
我做了一些调查，是这两个代码片段导致了这个问题。基本上，如果产品已经在购物车中，则将添加到购物车文本更改为已经在购物车中。如果产品已经在购物车中，另一个片段将用户引导到购物车页面。
add_filter( 'woocommerce_product_add_to_cart_text', 'woocommerce_custom_add_to_cart_text', 10, 2 );
function woocommerce_custom_add_to_cart_text( $add_to_cart_text, $product ) {
// Get cart
$cart = WC()->cart;
// If cart is NOT empty
if ( ! $cart->is_empty() ) {
// Iterating though each cart items
foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
// Get product id in cart
$_product_id = $cart_item['product_id'];
// Compare
if ( $product->get_id() == $_product_id ) {
// Change text
$add_to_cart_text = 'Already in cart';
break;
}
}
}
return $add_to_cart_text;
}
add_filter( 'woocommerce_product_add_to_cart_url', 'redirect_product_exist_in_cart', 10, 2 );
function redirect_product_exist_in_cart( $add_to_cart_url, $product ){
if( WC()->cart->find_product_in_cart( WC()->cart->generate_cart_id( $product->id ) ) // if in the cart
&& $product->is_purchasable() // we also need these two conditions
&& $product->is_in_stock() ) {
$add_to_cart_url = wc_get_cart_url();
}
return $add_to_cart_url;
}
更新
下一个问题，仅剩下与购物车按钮文本挂钩相关的另一个问题。下面是此的堆栈跟踪：
Stack trace:
#0 /home4/metis/public_html/staging/4326/wp-includes/class-wp-hook.php(287): woocommerce_custom_add_to_cart_text('Add to cart', Object(WC_Product_Simple))
#1 /home4/metis/public_html/staging/4326/wp-includes/plugin.php(206): WP_Hook->apply_filters('Add to cart', Array)
#2 /home4/metis/public_html/staging/4326/wp-content/plugins/woocommerce/includes/class-wc-product-simple.php(62): apply_filters('woocommerce_pro...', 'Add to cart', Object(WC_Product_Simple))
#3 /home4/metis/public_html/staging/4326/wp-content/plugins/woo-gutenberg-products-block/src/BlockTypes/AbstractProductGrid.php(473): WC_Product_Simple->add_to_cart_text()
#4 /home4/metis/public_html/staging/4326/wp-content/plugins/woo-gutenberg-products-block/src/BlockTypes/AbstractProductGrid.php(446): Automattic\WooCommerce\Blocks\BlockTypes\Abstra in /home4/metis/public_html/staging/4326/wp-content/plugins/code-snippets/php/snippet-ops.php(446) : eval()'d code on line 7
下面的代码包含
但是，有一个条件的代码工作，你需要首先在后端：
WooCommerce
然后你得到
function woocommerce_custom_add_to_cart_text( $add_to_cart_text, $product ) {
// WC Cart
if ( WC()->cart ) {
// If this doesn't fix the error, other things you could try (replace the above if condition with 1 of the following)
//if ( ! is_admin() && WC()->cart ) {
//if ( ! is_null( WC()->cart ) ) {
// Get cart
$cart = WC()->cart;
// If cart is NOT empty
if ( ! $cart->is_empty() ) {
// Iterating though each cart items
foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
// Get product id in cart
$_product_id = $cart_item['product_id'];
// Compare
if ( $product->get_id() == $_product_id ) {
// Change text
$add_to_cart_text = 'Already in cart';
break;
}
}
}
}
return $add_to_cart_text;
}
add_filter( 'woocommerce_product_add_to_cart_text', 'woocommerce_custom_add_to_cart_text', 10, 2 );
function filter_woocommerce_add_to_cart_validation( $passed, $product_id, $quantity, $variation_id = null, $variations = null ) {
// Set variable
$in_cart = false;
// Loop
foreach( WC()->cart->get_cart() as $cart_item ) {
if ( $cart_item['data']->get_id() == $product_id ) {
$in_cart = true;
break;
}
}
// Get cart url
$cart_url = wc_get_cart_url();
// True
if ( $in_cart ) {
wp_safe_redirect( $cart_url );
exit();
} else {
// Add product to cart
WC()->cart->add_to_cart( $product_id, $quantity );
wp_safe_redirect( $cart_url );
exit();
}
return $passed;
}
add_filter( 'woocommerce_add_to_cart_validation', 'filter_woocommerce_add_to_cart_validation', 10, 5 );
