WooCommerce add to cart validation: prevent add to cart

4 comments

1. I would have said that you should use Product Add-Ons but it doesn’t seem to have a date picker. Anyway, I would try modifying your validation function as follows:

   function add_the_date_validation( $passed ) { 
   if ( empty( $_REQUEST['thedate'] )) {
       wc_add_notice( __( 'Please enter a date.', 'woocommerce' ), 'error' );
       $passed = false;
   }
   return $passed;
   }
   add_filter( 'woocommerce_add_to_cart_validation', 'add_the_date_validation', 10, 5 );  
   

   Instead of returning TRUE you want to return the current status of the $passed variable. I can’t promise that will work, because I am not going to set up the rest of the code required to test it, but this is similar to what I have done many times.

   On another note, unless you mean to apply this validation to every product in your store, you need to limit this function with some additional conditional logic.

2. I had this issue and after much trial and error the fix was to adjust the $priority parameter (10 is default) in :

   add_filter( 'woocommerce_add_to_cart_validation', 'add_the_date_validation', 10, 5 );
   

   As per usual, I tried everything else first…changed this to 15 and bingo..! I guess it was running ahead of code ranked lower priority, which then let items into cart.

3. // Allow only pre-defined quantity from specific per category in the cart
   add_filter( 'woocommerce_add_to_cart_validation', 'allowed_quantity_per_category_in_the_cart', 10, 2 );
   function allowed_quantity_per_category_in_the_cart( $passed, $product_id) {
   
     $running_qty = 0;
     $restricted_product_cats = $restricted_product_cat_slugs = array();
   
       //Specify the category/categories by category slug and the quantity limit
       $restricted_product_cats[] = array('cat_slug'=> 'skip-bins', 'max_num_products' => 1); // change here
       //$restricted_product_cats[] = array('cat_slug'=> 'caliper-paint-kit', 'max_num_products' => 4); //change here
       foreach($restricted_product_cats as $restricted_prod_cat) $restricted_product_cat_slugs[]= $restricted_prod_cat['cat_slug'];
   
       // Getting the current product category slugs in an array
       $product_cats_object = get_the_terms( $product_id, 'product_cat' );
       foreach($product_cats_object as $obj_prod_cat) $current_product_cats[]=$obj_prod_cat->slug;
   
       // Iterating through each cart item
       foreach (WC()->cart->get_cart() as $cart_item_key=>$cart_item ){
   
   
           // Check if restricted category/categories found
         if( array_intersect($restricted_product_cat_slugs, $current_product_cats) ) {
   
           foreach($restricted_product_cats as $restricted_product_cat){
             if( in_array($restricted_product_cat['cat_slug'], $current_product_cats) && has_term( $current_product_cats, 'product_cat', $cart_item['product_id'] )) {
   
                       // count(selected category) quantity
               $running_qty += (int) $cart_item['quantity'];
   
                       // Check if More than allowed products in the cart
               if( $running_qty >= $restricted_product_cat['max_num_products'] ) {
   
                           //limit to maximum allowed
                           //WC()->cart->set_quantity( $cart_item_key, $restricted_product_cat['max_num_products'] ); // Change quantity
   
                           // Get the category information
                 $catinfo = get_term_by('slug', $restricted_product_cat['cat_slug'], 'product_cat');
   
                 wc_add_notice( sprintf( 'Maximum of  %s '.($restricted_product_cat['max_num_products']>1?'skip bin ('.$catinfo->name.') are':'skip bin').' allowed in the cart. Please remove the existing Skip Bin from the cart to add the new Skip Bin',  $restricted_product_cat['max_num_products'] ), 'error' );
                            ///WC()->cart->empty_cart();
                           $passed = false; // don't add the new product to the cart
                           // We stop the loop
                           break;
                         }
                       }
                     }
                   }
                 }
                 return $passed;
   }
   

4. Yes, sorry i’am new in this forum.
   However i have found a solution, i have edit directly class-wc-cart.php at line 900, and i have copy the function before the if:

   if($passed!=false)
   {
       do_action( 'woocommerce_add_to_cart', $cart_item_key, $product_id, $quantity, $variation_id, $variation, $cart_item_data );
   }
   

   Now for me it works, i know that isn’t the most correct solution but for the moment it works, i have only to be careful when i will update woocommerce

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