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Lesson 23 - E-shop in ASP.NET Core MVC - Finishing the Shopping Cart

In the previous lesson, E-shop in ASP.NET Core MVC - Cart - Business Layer, we prepared basic functions for adding products to the shopping cart. In today's ASP.NET Core tutorial, we're going to add this functionality to our application and we're also going to start with an order progress widget.

Controller

We have the form for adding goods to the cart already prepared in the product list and product detail. So far, these forms refer to a non-existent ProcessCartForm() action in ProductController. Thanks to the methods we've prepared in the business layer, the code of this action will be very simple:

[HttpPost]
public IActionResult ProcessCartForm(int productId, int quantity)
{
    orderManager.AddProducts(productId, quantity);
    this.AddFlashMessage(new FlashMessage("The goods has been added to the cart.", FlashMessageType.Success));
    return Redirect(Request.Headers["Referer"].ToString());
}

Note: Of course, we need to create a new OrderManager instance at the controller level, but I'm sure you already know how to do that...

Displaying the Current Cart Status

Now, when adding an item to the cart, we should see the success information. But there's still an empty cart in the upper right corner of the page. No wonder, if we look in _Layout.cshtml, the value $ 0 is hardcoded there. Our next task will be to update the displayed price according to the current status of the cart.

Preparing a Filter

We want to show the current cart status no matter what action we're performing. Therefore, we'll save this value in


 

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In this ASP.NET Core tutorial, we'll implement adding products to the shopping cart. We'll prepare a helper, CSS styles and methods for a progress widget.

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