Step I - Find and replace showModal(resp.modal)

On this way, we will try to edit your-website/modules/ ps_shoppingcart/ps_shoppingcart.js file. Somewhere near line 49 you can find code like this:

  if (resp.modal) {
              showModal(resp.modal);
  }
  

showModal(resp.modal) is the source code calls the modal popup. Change it to disable the popup and redirect customers to Cart Summary page:

  if (resp.modal) {
              window.location.replace(prestashop.urls.pages.cart);
  }
  

Clear website's cache and browser cache to see the result.

It works!

But...hang on! This trick works if the visitors is not logged in. However, if they add the products while logged in, they get redirected to the homepage instead of Cart summary.

Step II - Redirect to the Cart Summary page

We developed a Prestashop module called ChargeMe that allow you to sell subscription products ( magazines, membership, books...etc..) via Paypal.

We want only 1 subscription product on basket when checkout, so we need the redirection automatically when they add Subscribe button. Then we add a function into our js file:

  prestashop.on('updateCart',function (event) {
                          ...
                              $.post(ajax_url, requestData, null, 'json').then(function (resp) {
                                  location.href = cart_url;
                              }).fail(function (resp) {
                                  prestashop.emit('handleError', {eventType: 'updateShoppingCart', resp: resp});
                              });
                        });

As you see, instead of redirect to prestashop.urls.pages.cart, we want to redirect to cart_url. This value is a predefined value. And no matter what they are logged in your website or not, the module will redirects to cart summary immediately.

What will you have to do now ? We have to add our value to your website. Open your-website/modules/ps_shoppingcart/ ps_shoppingcart.php file to add something. You will see:

public function hookHeader()
      {
          if (Configuration::isCatalogMode()) {
              return;
          }

          if (Configuration::get('PS_BLOCK_CART_AJAX')) {
              $this->context->controller->registerJavascript('modules-shoppingcart', 'modules/'.$this->name.'/ps_shoppingcart.js', ['position' => 'bottom', 'priority' => 150]);
          }
      }

Change it to

  public function hookHeader()
      {
          if (Configuration::isCatalogMode()) {
              return;
          }

          if (Configuration::get('PS_BLOCK_CART_AJAX')) {
              $this->context->controller->registerJavascript('modules-shoppingcart', 'modules/'.$this->name.'/ps_shoppingcart.js', ['position' => 'bottom', 'priority' => 150]);
          }
          $this->smarty->assign(array(
              'cart_url' => $this->getCartSummaryURL(),
          ));

          return $this->fetch('module:ps_shoppingcart/header.tpl');
      }

We called a new file, and now we need to create it as /your-website/modules/ ps_shoppingcart/header.tpl. Put this content into this file:

  <script type="text/javascript">
      {if isset($cart_url)}
          var cart_url = '{$cart_url}';
      {/if}
  </script>

What is the different?

You know, prestashop.urls.pages.cart is not a predefined value. If the customer login, prestashop.urls.pages.cart means homepage, or not, it means Cart page. We need to use our value.

Now we can edit /your-website/modules/ps_shoppingcart/ps_shoppingcart.js file by using our value:

  if (resp.modal) {
             location.href = cart_url;
  }